CN1062649C - Gate valve for size mixing tank - Google Patents

Abstract

A gate valve for a slurry mixing box, including a gate plate, a valve body and the like. The gate plate is inserted into the groove in the middle of the valve body to form a sliding fit. There is a specially designed gate valve slurry outlet on the valve body. As long as you know the flow regulation characteristic expression, you can obtain any required slurry box gate valve output. Oar mouth opening curve equation. The gate valve of the present invention is self-contained and can be fixed on the inner partition of the slurry mixing box, which is convenient to assemble and disassemble; the shape of the gate valve slurry outlet can be designed in various shapes according to the different flow adjustment characteristics; the inner edge of the gate valve slurry outlet Making large chamfers not only increases the flow capacity of the slurry, but also avoids the phenomenon of hanging slurry.

Description

Gate valve for size mixing tank

The present invention relates to gate valve, specifically a kind of gate valve for size mixing tank.

In the paper-making process, it generally all is by changing the gatage in the stuff box that slurries are quantitatively regulated, and promptly changes its outlet and starches that flow realizes.With regard to manual Flow-rate adjustment, operator wish that the valve of regulating has linear performance, and promptly the unit scale changes in flow rate of valve position stroke is a constant, and for automatic control system, the adjusting of flow changes then often represents promptly have equal percentage characteristics with the percentage form.Paper mill slurry flow adjusting at present all is by opening a rectangular opening in stuff box internal partition bottom, lifting with a flashboard, the vertical size that promptly changes rectangular opening is regulated flow, and its Flow-rate adjustment characteristic is that the automatic adjusting of manual tune or computer all is unfavorable.In order to obtain needed control characteristic, in many computer controlled systems, have to select else the modulating valve of outsourcing and regulate control, need not and the gate of stuff box is all opened.In addition, because internal partition and stuff box be welded as a whole, this structure of perforate in the stuff box internal partition, its hole shape, size etc. all can't change, and also can't carry out the replacing and the loading and unloading of valve.And opening does not add processing, causes hanging easily.

The objective of the invention is: design a kind of as long as change the gate valve for size mixing tank that gate valve grout outlet shape just can obtain any desired Flow-rate adjustment characteristic, to solve problems of the prior art.

In order to reach the purpose of foregoing invention, the technology that the present invention adopts is: it comprises flashboard, and valve body has the gate valve grout outlet on the valve body.Flashboard inserts in the groove at valve body middle part, and formation is slidingly matched, and the chamfering of the inside edge in hole and the angle between axis are 45 °～60 °.Whole gate valve is screwed on the internal partition of stuff box.According to fluid mechanics principle,, adopt mathematical method to obtain the opening shape curvilinear equation and carry out perforate in conjunction with Flow-rate adjustment characteristic representation.

Gate valve grout outlet shaped design: a liquid level is the stuff box of H, and it is that the rate of discharge at y place can be expressed as from the liquid bottom height $v=\mathrm{Co}\sqrt{2g(H-y)}--\left(1\right)$ In the formula: V is flow velocity C _oG is a gravity accleration for the circulation coefficient.The bottom to the outlet total discharge of y height is $Q=\mathrm{Co}{\∫}_o^y\[\sqrt{2g(H-y)}\·2f\left(y\right)\]\·\mathrm{dy}--\left(2\right)$ Its flow Q is to the y differentiate $\frac{\mathrm{dQ}}{\mathrm{dy}}=\mathrm{Co}\sqrt{2g(H-y)}\·2f\left(y\right)--\left(3\right)$

As long as know Flow-rate adjustment characteristic representation, just can ask for any needed gate valve for size mixing tank opening curvilinear equation.Its method is: the Flow characteristics representation is tried to achieve the y differentiate $\frac{\mathrm{dQ}}{\mathrm{dy}}$ Value substitution following formula is organized into f (y) representation then, promptly is exactly the gate valve grout outlet opening curvilinear equation of required Flow characteristics.

The present invention compared with prior art, the useful effect that has is:

1. gate valve has a style of one's own, and links to each other with stuff box with screw during installation, and therefore, replacing, convenient disassembly can not bring any influence to stuff box integral body yet.

2. because therefore gate valve grout outlet shape can, can obtain having the gate valve of any required Flow characteristics by arbitrary desired Flow-rate adjustment characteristic rule design.

3. big chamfering is made in gate valve grout outlet inside edge, and not only the slurry flow ability increases, and has avoided phenomenons such as hanging simultaneously.

Description of drawings:

Fig. 1, general structure schematic representation of the present invention

Fig. 2, A-A sectional view of the present invention

The A-A of Fig. 3, valve body analyses and observe

Fig. 4, gate valve grout outlet curve shape figure with linear flow control characteristic

Fig. 5, gate valve grout outlet curve shape figure with equal percentage Flow-rate adjustment characteristic

Below in conjunction with accompanying drawing, the present invention is further illustrated.As Fig. 1, Fig. 2, shown in Figure 3, flashboard 1 inserts in the groove 6 of valve body 2, have the gate valve grout outlet 4 of special shape on the valve body 2, the angle between gate valve grout outlet 4 inside edge chamferings and axis is 45～60 °, and gate valve is fixed on the internal partition 5 of stuff box (stuff box does not draw among the figure) with screw 3.

A. for a linear flow control characteristic, should satisfy following relation:

Q=K _yIts corresponding derivative of y (4) $\frac{\mathrm{dQ}}{\mathrm{dy}}=K_y--\left(5\right)$ K in the formula _yBe the linearly adjust coefficient.(5) formula substitution (3) formula and put in order $f\left(y\right)\frac{{\mathrm{<figure-callout\; id="2"\; label="K\; y"\; filenames="9810686000061.png"\; state="\{\{state\}\}">K</figure-callout>}}_y}{2_{\mathrm{Co}}\sqrt{2g(H-y)}}--\left(6\right)$ (6) formula is exactly the perforate curvilinear equation with linear flow control characteristic, and the curve basic shape as shown in Figure 1.Its Flow characteristics of stuff box slurry outlet shape with this curvilinear equation processing meets (4) formula relation.Select different K _yValue just can obtain different linear adjustment characteristics, promptly is exactly the gate valve grout outlet opening curvilinear equation of required Flow characteristics.

B. for an equal percentage Flow-rate adjustment characteristic, its representation is $Q=Q_{\max }R(\frac{y}{y_{\max }}-1)--\left(7\right)$ In the formula: the flow of Q for regulating: Q _MaxBe the maximal regulated flow, R is a regulating ratio, and y is valve opening y _MaxBe the valve maximum opening.Its corresponding derivative $\frac{\mathrm{dQ}}{\mathrm{dy}}=\frac{Q_{\max }}{y_{\max }}\&CenterDot;\ln R\&CenterDot;R(\frac{y}{y_{\max }}-1)--\left(8\right)$ (8) formula substitution (3) formula is also put in order $f\left(y\right)=\frac{\frac{Q_{\max }}{y_{\max }}\&CenterDot;\ln R\&CenterDot;R(\frac{y}{y_{\max }}-1)}{2_{\mathrm{Co}}\sqrt{2g(H-y)}}--\left(9\right)$ (9) formula is exactly the opening curvilinear equation with equal percent regulating characteristic, and the fundamental curve shape as shown in Figure 2.Its Flow characteristics of stuff box outlet shape by this curvilinear equation processing meets (7) formula relation.Select different parameter generation following formulas, just can obtain different equal percent regulating characteristics.It promptly is exactly the gate valve grout outlet opening curvilinear equation of required Flow characteristics.

Design example:

Design a gate valve opening curve, require: peak rate of flow with linear flow control characteristic $Q_{\max }=30{\mathrm{<figure-callout\; id="3"\; label="m"\; filenames="9810686000061.png"\; state="\{\{state\}\}">m</figure-callout>}}^3/h,$ Gate travel reaches peak rate of flow, that is: range y when transferring to the 30mm height _Max=30mm, circulation coefficient Co is 0.81, the liquid level H of fluid level to gate valve perforate lower end is 800mm.Design procedure is as follows:

1. uniform units

$K_y=\frac{Q_{\max }}{l_{\max }}=\frac{8333333\&CenterDot;3}{30}=277777\&CenterDot;8$

2. parameter substitution (6) formula f (y) $\frac{277777.8}{2\&times;0.81\sqrt{2\&times;9800\&times;(800-y)}}$ Obtain the opening curvilinear equation.

3. curve plotting: the simulation curve shape as shown in Figure 1.

Claims (3)

1. A gate valve for a slurry mixing box, including a gate plate, a valve body, and a gate valve slurry outlet is opened on the valve body, and is characterized in that: 1). The gate [1] is inserted into the groove [6] in the middle of the valve body [2] and forms a sliding fit. The valve body [2] has a gate valve slurry outlet [4] with a special shape, and the gate valve slurry outlet [4] The angle between the inner edge chamfer and the axis is 45°～60°, and the whole gate valve is fixed on the inner partition [5] of the mixing box with screws [3] 2). Shape Design of Slurry Outlet of Gate Valve For a slurry mixing box with a liquid level height H, the outlet flow at the height y from the bottom of the liquid can be expressed as $V=\mathrm{co}\sqrt{2g(h-\mathrm{the\; y})}$ In the formula: V is the flow velocity C _o is the flow coefficient g is the gravitational acceleration The total outlet flow from the bottom to the y height is $Q=\mathrm{co}{\&Integral;}_o^{\mathrm{the\; y}}\&lsqb;\sqrt{2g(h-\mathrm{the\; y})}\&Center\; Dot;2f\left(\mathrm{the\; y}\right)\&rsqb;\&Center\; Dot;\mathrm{dy}$ Its flow Q is derived with respect to y $\frac{\mathrm{wxya}}{\mathrm{dy}}=\mathrm{co}\sqrt{2g(h-\mathrm{the\; y})}\&Center\; Dot;2f\left(\mathrm{the\; y}\right)$ As long as you know the flow regulation characteristic expression, you can obtain any required opening curve equation of the slurry box gate valve. The method is: the flow characteristic expression is derived from y, and the obtained $\frac{\mathrm{wxya}}{\mathrm{dy}}$ The value is substituted into the above formula, and then sorted into f(y) expression, that is, the gate valve slurry port opening curve equation of the required flow characteristics. 2. According to claim 1, the slurry tank gate valve is characterized in that: for a linear flow regulation characteristic, the following relationship should be satisfied: Q=K _y y, and its corresponding derivative is $\frac{\mathrm{wxya}}{\mathrm{dy}}$ =K _y , where K _y is the linear adjustment coefficient. Substitute the above formula into $\frac{\mathrm{wxya}}{\mathrm{dy}}=\mathrm{co}\sqrt{2g(h-\mathrm{the\; y})}\&Center\; Dot;2f\left(\mathrm{the\; y}\right)$ and sorted out: $f\left(\mathrm{the\; y}\right)=\frac{K_{\mathrm{the\; y}}}{2\mathrm{co}\sqrt{2g(h-\mathrm{the\; y})}}$ By choosing different K _y values, different linear adjustment characteristics can be obtained. That is, the opening curve equation of the gate valve slurry port with the required flow characteristics. 3. The pulping box gate valve according to claim 1 is characterized in that: for an equal percentage flow regulation characteristic, its expression is $Q=Q_{\max }R(\frac{\mathrm{the\; y}}{{\mathrm{the\; y}}_{\max }}-1)$ Where: Q is the regulated flow; Q _max is the maximum regulated flow; R is the adjustable ratio: y is the opening of the valve: y _max is the maximum opening of the valve, and its corresponding derivative is: $\frac{\mathrm{wxya}}{\mathrm{dy}}=\frac{Q_{\max }}{{\mathrm{the\; y}}_{\max }}\&CenterDot;\mathrm{mR}\&CenterDot;R(\frac{\mathrm{the\; y}}{{\mathrm{the\; y}}_{\max }}-1)$ Substitute the above formula into $\frac{\mathrm{wxya}}{\mathrm{dy}}=\mathrm{co}\sqrt{2g(h-\mathrm{the\; y})}\&Center\; Dot;2f\left(\mathrm{the\; y}\right)$ and sorted out $f\left(\mathrm{the\; y}\right)=\frac{\frac{Q_{\max }}{{\mathrm{the\; y}}_{\max }}\&Center\; Dot;\mathrm{mR}\&CenterDot;R(\frac{\mathrm{the\; y}}{{\mathrm{the\; y}}_{\max }}-1)}{2_{\mathrm{co}}\sqrt{2g(h-\mathrm{the\; y})}}$ By substituting different parameters into the above formula, different equal percentage adjustment characteristics can be obtained, that is, the opening curve equation of the gate valve slurry port with the required flow characteristics.

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