CN203516761U - Stop valve - Google Patents

Abstract

The utility model relates to the technical field of valves, in particular to a stop valve. The stop valve comprises a stud and a nut. Multiple threads are arranged on the outer surface of the stud. Multiple threads are arranged on the inner surface of the nut. The stud is matched with the nut. According to the stop valve, due to the adoption of the transmission mode that the stud with the multiple threads is matched with the nut with the multiple threads, on the premise that stress can be guaranteed, the lead of the multiple threads is larger than the lead of a single thread. In the process of opening or closing the valve, the ascending or descending speed of a valve rod is high, the effect of rapidly opening the valve can be achieved, and the time for opening or closing the valve is short.

Description

Stop valve

Technical field

The utility model relates to valve technology field, in particular to a kind of stop valve.

Background technique

Stop valve claims again pipe valve valve, is a kind of forced seal formula valve, and in the process of work, the single thread arranging on the valve rod of stop valve is connected with the nut thread on valve gap, and valve gap is relative with valve body fixing.Therefore, can be by rotatable handle so that valve rod axially move, and then the valve port on flap and valve body is departed from or sealing, to realize the object of open/close valve.

But, in correlation technique, for guaranteeing can be because of the stressed excessive stripped thread that occurs between screw thread and nut, adopt of valve rod has the mode that both single thread of constant pitch coordinates with nut thread more, in engagement process, stressed owing to guaranteeing, therefore single threaded helical pitch is less, valve rod need to be rotated to the more number of turns and just can realize open/close valve; Required time of open/close valve is long.

Model utility content

The purpose of this utility model is to provide a kind of stop valve, to solve the above problems.

A kind of stop valve is provided in embodiment of the present utility model, has comprised double-screw bolt and nut; The outer surface of described double-screw bolt is provided with multi start thread; The internal surface of described nut is provided with described multi start thread; Described double-screw bolt matches with described nut.

The stop valve of the utility model above-described embodiment, owing to having adopted the double-screw bolt and the kind of drive that the nut with multi start thread matches that is provided with multi start thread, can guarantee that, under stressed prerequisite, the helical pitch of multi start thread is larger than single threaded helical pitch.Therefore, in the process of open/close valve, make the speed of valve rod rise/fall fast, can realize the effect of opening soon, required time of open/close valve is short.

Accompanying drawing explanation

Fig. 1 shows the schematic diagram of the stop valve that the utility model embodiment one and embodiment two provide;

Fig. 2 shows the schematic diagram that the Effector of the stop valve that the utility model embodiment two provides is cylinder.

Embodiment

Below by specific embodiment, also by reference to the accompanying drawings the utility model is described in further detail.

Please refer to Fig. 1, a kind of stop valve is provided in embodiment of the present utility model, comprise double-screw bolt 101 and nut 102; The outer surface of described double-screw bolt 101 is provided with multi start thread; The internal surface of described nut 102 is provided with multi start thread; Described double-screw bolt 101 matches with described nut 102.

A kind of stop valve of the utility model above-described embodiment, the stop valve of the utility model above-described embodiment, due to the kind of drive that has adopted the nut 102 that is provided with the double-screw bolt 101 of multi start thread and there is multi start thread to match, can guarantee that, under stressed prerequisite, the helical pitch of multi start thread is larger than single threaded helical pitch.Therefore, in the process of open/close valve, make the speed of valve rod 201 rise/falls fast, can realize the effect of opening soon, required time of open/close valve is short.

In order to make the utility model embodiment one stop valve, better applied, more effectively be applied in practice process, the utility model also provides embodiment two on the basis of above-described embodiment one, embodiment two is further restriction and the increases to making on embodiment one architecture basics, now be described in detail and explain, please refer to Fig. 1 and Fig. 2:

Embodiment two

In the present embodiment, preferred, inflow entrance 206 and the outflow opening 207 of the valve body 204 that also comprise valve rod 201, be provided with the valve gap 203 of through hole 202, is tightly connected with described valve gap 203 and the both sides of described valve body 204; Between described inflow entrance 206 and described outflow opening 207, be provided with valve port 205; Described nut 102 is positioned on described valve gap 203, and described double-screw bolt 101 makes its part penetrate the inside of described valve gap 203 by described nut 102; Described valve rod 201 is through described through hole 202, and the inside of its part in described valve gap 203, the inside of another part in described valve body 204, and described valve rod 201 and described through hole 202 sealings; Described valve rod 201 and described double-screw bolt 101 end in described valve gap 203 is fixedly connected with, and the other end of described valve rod 201 is provided with can be by the flap 208 of described valve port 205 sealings when described double-screw bolt 101 declines.

The devices such as valve rod 201, valve gap 203, flap 208 and valve body 204, and then form whole stop valve, in the process of specific operation, one end of valve rod 201 is provided with double-screw bolt 101, the other end is provided with flap 208, in the process moving up and down, flap 208 departs from or sealing with the valve port 205 of valve body 204 inside, and then realizes the effect of cut-out or throttling.

Concrete, in the present embodiment, in order to control engagement process between double-screw bolt 101 and nut 102, on described nut 102, be provided with the Effector 209 that can make nut 102 rotations; By Effector 209, can realize nut 102 rotations, and then make double-screw bolt 101 rise or decline.

In the present embodiment, in order to make in the process of open/close valve, can be accurately that valve port 205 is closely sealed by the valve rod 201 of double-screw bolt 101 interlocks and flap 208, described double-screw bolt 101 is coaxially connected with described valve rod 201; Described through hole 202 coaxially arranges with described valve port 205; The coaxial double-screw bolt 101 arranging and described valve rod 201 are also easy to realize rise/fall under the effect of Effector 209.

In the concrete process arranging, in order to make valve gap 203 be easy to be connected with valve body 204, preferred, valve gap 203 is connected with described valve body 204 flanges.

In the process of specific works, when the fluid in valve body 204 is subject to the downward power of valve rod 201, may there is the risk upwards leaking outside along valve rod 201 in fluid, therefore, in order to guarantee stop valve sealing in the course of the work, preferably, also comprise bellows 210 that under external force can be flexible and be arranged on the flange gasket between described valve gap 203 and valve body 204; Described bellows 210 is looped around the part of described valve rod 201 in described valve body 204, and its one end is fixedly connected on described flange gasket, and the other end is fixedly connected on described flap 208.In the process that valve rod 201 moves up and down, bellows 210 presents state compressed or that stretch, and because one end of bellows 210 is fixedly connected with (preferred weld) with flap 208, the other end is fixed on flange gasket; So the fluid of valve body 204 inside is intercepted in meeting, can not, by the gap between valve rod 201 and through hole 202, therefore, also just solve the problem leaking outside.

Concrete, please refer to Fig. 2, in the present embodiment, make the Effector 209 of double-screw bolt 101 rise/falls can be set to handle or the handwheel that can rotate; Or can be a cylinder 211; Concrete, can be set to different forms according to the requirement of work.

Generally speaking, the fluid that enters valve body 204 inside need to enter valve body 204 inside after filtering again, therefore, in the present embodiment, preferred, on inflow entrance 206, is provided with filter screen.By the filter screen arranging on inflow entrance 206, can realize the function of filtration.

In addition, in the present embodiment, in order to reduce the friction factor between double-screw bolt 101 and nut 102, nut 102 material used is generally than the material softer of double-screw bolt 101, so wearing and tearing mainly occur in the thread surface of nut 102.Therefore it is mainly shearing and the flexural strength of calculating nut thread that the intensity of nut thread is calculated.Therefore, the axial force acting on valve rod 201 is smaller, can not cause the diastrophic problem of valve rod 201.

Nut thread force analysis: after a circle worm tooth launches on nut 102, can regard overhang as, under the effect of load, by bending and shear action, its shearing strength condition is at worm tooth root place:

$\mathrm{\τ}=\frac{F}{\mathrm{z\πdb}}\≤\left[\mathrm{\τ}\right],\left(\mathrm{MPa}\right)$

Flexural strength condition is:

${\mathrm{\σ}}_b=\frac{M}{W}=\frac{\mathrm{Fh}/2}{\mathrm{\π}{\mathrm{dzb}}^2/6}=\frac{3\mathrm{Fh}}{\mathrm{\π}{\mathrm{dzb}}^2}\≤{\left[\mathrm{\σ}\right]}_b$

In formula: F is thrust load (N); H is the working depth of screw thread; D is the large footpath of nut thread (mm); Z is the number of effective coils of nut thread; B is worm tooth root width (mm), to square threaded form b=0.5P, buttress thread form b=0.74P, trapezoidal thread b=0.65P; [τ], [σ] b are respectively shearing allowable and flexural stress (N/mm ²), can be checked in by table 1.

The intensity of double-screw bolt is calculated: during double-screw bolt 101 work, have axial pressure or pulling force and torque T radially.The strength condition that can obtain dangerouse cross-section according to fourth strength theory is:

${\mathrm{\σ}}_e=\sqrt{\mathrm{\σ}+3{\mathrm{\τ}}^2}=\sqrt{{\left(\frac{4F}{\mathrm{\π}{d}_1^2}\right)}^2+3{\left(\frac{T}{0.2d_1^3}\right)}^2}\≤\left[\mathrm{\σ}\right]$

In formula: [σ] is allowable stress (N/mm ²), in Table 1; T is torque (N/mm ²).

Allowable stress (the N/mm of table 1 double-screw bolt 1 and nut ²)

The stability of double-screw bolt is controlled: for the large double-screw bolt 101 of slenderness ratio, bear axial force when excessive, double-screw bolt will destroy because of unstability, therefore need carry out Stability Checking.It checks calculating formula: F _c/ F>=2.5～4; Wherein: F _cfor the critical pressure of double-screw bolt, occurrence can be looked into relevant handbook.

In the present embodiment, if the interior high temperature fluid that often circulating of valve body 204, the device directly contacting with fluid so needs to have function high temperature resistant and that be difficult for getting rusty, and therefore, preferred, in the present embodiment, described bellows 210 is corrugated stainless steel tubing; Preferred, adopt double-deck or three layers of 316L corrugated stainless steel tubing 210, at the surface build-up welding Si Taili cemented carbide near valve rod 201; Make it have the excellent function of hard sealing, high temperature resistant, erosion resistance cavitation burn into wearability.

To sum up, this stop valve of the present embodiment, can be easily rapidly switch valve (handle or handwheel Rotate 180 °), again can be high temperature resistant, zero leakage, long service life.There is no fluid loss, reduce energy loss, there is no environmental pollution, improve plant produced Security.This novel practical stop valve is applicable to worst hot case, is applicable to food and drink, grain and oil feed, beer, dairy products, pharmacy, textile printing and dyeing, petrochemical industry, papermaking, tobacco, iron and steel, power industry etc. and switch frequent and require the operating mode of snap switch.

The foregoing is only preferred embodiment of the present utility model, be not limited to the utility model, for a person skilled in the art, the utility model can have various modifications and variations.All within spirit of the present utility model and principle, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection domain of the present utility model.

Claims (9)

1. stop valve, is characterized in that, comprising: double-screw bolt and nut; The outer surface of described double-screw bolt is provided with multi start thread; The internal surface of described nut is provided with described multi start thread; Described double-screw bolt matches with described nut.

2. stop valve according to claim 1, is characterized in that, also comprises valve rod, is provided with inflow entrance and the outflow opening of the both sides of the valve gap of through hole, the valve body being connected with described valve bonnet seal and described valve body;

Between described inflow entrance and described outflow opening, be provided with valve port;

Described nut is positioned on described valve gap, and described double-screw bolt makes its part penetrate the inside of described valve gap by described nut;

Described valve rod is through described through hole, and the inside of its part in described valve gap, the inside of another part in described valve body, and described valve rod and the sealing of described through hole;

Described valve rod and the end of described double-screw bolt in described valve gap are fixedly connected with, and the other end of described valve rod is provided with can be by the flap of described sealing valve port when described double-screw bolt declines.

3. stop valve according to claim 2, is characterized in that, is provided with the Effector that can make described nut rotation on described nut.

4. stop valve according to claim 2, is characterized in that, described double-screw bolt is coaxially connected with described valve rod; Described through hole and described valve port coaxially arrange.

5. stop valve according to claim 2, is characterized in that, described valve gap is connected with described valve flange.

6. stop valve according to claim 5, is characterized in that, also comprises bellows that under external force can be flexible and is arranged on the flange gasket between described valve gap and valve body;

Described corrugated pipe ring is the part in described valve body around described valve rod, and its one end is fixedly connected on described flange gasket, and the other end is fixedly connected on described flap.

7. stop valve according to claim 3, is characterized in that, described Effector is handle or handwheel.

8. stop valve according to claim 3, is characterized in that, described Effector is cylinder.

9. according to the stop valve described in claim 2-8 any one, it is characterized in that, on described inflow entrance, be provided with filter screen.

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