CN2169006Y

CN2169006Y - Check valve with butterfly gate

Info

Publication number: CN2169006Y
Application number: CN 93231390
Authority: CN
Inventors: 刘达东; 刘兆英; 刘勇
Original assignee: Individual
Current assignee: Individual
Priority date: 1993-07-17
Filing date: 1993-07-17
Publication date: 1994-06-15
Anticipated expiration: 2003-07-17

Abstract

The utility model relates to a check valve which is used in a conveying pipe network to prevent fluid from refluxing when a pump is stopped. The utility model comprises a valve body 1, a valve plate 2 and a valve plate shaft 10 which is a horizontal shaft of which both ends are arranged on the valve body. The height of the distance between the shaft line of the horizontal shaft and the central line of a check port of the valve body is H (H is smaller than R and larger than O, R is the radius of the check port). At least one shaft hole 8 and a spacing clamp 13 are fixed on the back face of the valve plate and an elastic shaft sleeve 9 is arranged between the shaft hole 8 and the valve plate shaft; a U-shaped groove of the spacing clamp 13 is clamped on a double-faced groove 14 of the valve plate shaft 10. The utility model has the advantages of small volume, light weight, large switching range and small resistance.

Description

Check valve with butterfly gate

The utility model belongs to a kind of and is installed on the fluid-transporting tubing, generally is installed in the delivery side of pump place, is used for preventing to be transferred the safety check of fluid refluence.

At present, the safety check of production has following three kinds: first kind is Swing check valve; Second kind is Lift check valve; The third is a Tiny Drag Slow Shut Check Valves, and its Swing check valve and Lift check valve because technical performance is poor, are little by little replaced by micro-resistance slowly-closed formula safety check.But, concerning Tiny Drag Slow Shut Check Valves, it still exists deficiency, one, valve shaft are positioned at the top of non-return mouth, and the volume ratio of the valve plate of producing like this is bigger, therefore the unlatching spatial requirement of valve plate is bigger, just the volume ratio of the valve body of its requirement is bigger, and the material of making valve body consumption is many, and the manufacture cost of valve body also correspondingly improves; Its two because valve plate is bigger, the resistance of valve plate self ground weight convection cell is just bigger, energy consumption is also just bigger.According to test, the open degree of valve plate generally can only reach 80～85 degree, and convection cell has produced bigger resistance; Its three because valve body is bigger, lifting, transportation, the installation of valve body all compare difficult, particularly concerning the pumping plant of tradition use butterfly valve, because the mounting point is narrower, moreover owing to be subjected to the restriction in pump house space, the Tiny Drag Slow Shut Check Valves that uses is difficult to install at present.

The purpose of this utility model is in order to overcome above-mentioned deficiency, the butterfly plate formula safety check that a kind of volume of design is little, in light weight, unlatching is big.

The utility model is to realize like this, it comprises valve body and the valve plate that constitutes this safety check, its valve shaft that valve plate is installed is a horizontal axis, the two ends of this valve shaft are installed on the valve body, the axis of valve shaft is H[H＞0 apart from the height of the flat center line of the horizontal saliva of valve body non-return mouth, and H is less than valve body non-return port radius R].At least be fixed with an axis hole and a spacing card at the back side of valve plate, between axis hole and valve shaft, elastic shaft sleeve be housed.Spacing card is a U-shaped, be installed on the double groove of valve shaft, so just constituted this butterfly valve type safety check, its working principle is: when water pump is started shooting, the fluid that water pump is extracted out at first acts on the front of valve plate, valve plate is had individual active force, move after slightly at the effect lower valve plate of this active force, valve plate turns over to be opened.During termination of pumping, fluid refluxes under the effect of gravity, and valve plate to returning upset, is closed the non-return mouth under the effect of its gravity, realizes the purpose that refluxes and end.

Because the valve shaft of the safety check that the utility model adopted is installed in more than the flat center line of the horizontal saliva of non-return mouth, under the peak, thereby can reduces the area of valve plate, thereby reach the purpose that reduces valve volume.It has not only saved material, has reduced cost, and has made things convenient for transportation, installation.After the valve plate of this safety check was opened, the valve plate part of valve shaft both sides produced the part gravitational equilibrium voluntarily, can reduce the resistance of valve plate deadweight convection cell so widely, helped passing through of fluid.

Fig. 1 is a structure principle chart of the present utility model;

Fig. 2 is the A-A sectional view of Fig. 1;

Fig. 3 is the B-B sectional view of Fig. 2;

Fig. 4 is the schematic diagram of Slow Close damping mechanism.

Below in conjunction with accompanying drawing the utility model is described in detail: valve body 1 of the present utility model has the spheroid structure of flange plate for two ends, and the inner chamber of valve body 1 has the non-return mouth.Valve plate 2 with regard to spiral-lock on the non-return mouth of valve body 1.The valve shaft 10 that valve plate 2 is installed is a horizontal axis, and the two ends of valve shaft 10 are installed on the valve body 1, in order to guarantee that its valve shaft 10 freely rotates in the axis hole that valve shaft 10 is installed bearing 15 is installed preferably.The position of valve shaft 10 is H apart from the height of the flat center line of the horizontal saliva of non-return mouth more than the flat center line of the horizontal saliva of non-return mouth of valve body 1, H＞0 wherein, and H is less than the non-return port radius R of valve body 1.At least be fixed with an axis hole 8 and a spacing card 13 at the back side of valve plate 2.Its spacing card 13 is preferably one, is positioned at the centre of valve plate 2.Axis hole 8 is preferably two, lays respectively at the both sides of spacing card 13.Between axis hole 8 and valve shaft 10, elastic shaft sleeve 9 is housed.Spacing card 13 manufactures U-shaped, the back side of fixed installation valve plate 2, and the U-groove bevel of spacing card 13 is stuck on the double groove 14 of valve shaft 10.In order to keep the sealing between valve plate 2 and the non-return mouth, at the outer edge of valve plate 2 seal ring 11 that to fix a cross section be U-shaped, seal ring 11 can be made separately, is fixedly mounted on the outer ring of valve plate 2 by method such as bonding then.Seal ring 11 also can be that rubber is directly vulcanized on valve plate 2.For the ease of processing, guarantee the precision of non-return mouth, on the non-return mouth, preferably fixedly mount a seal ring 7.In order to prevent that valve plate 2 from overturning in the opposite direction when closing valve, be fixed with boss 12 in the outlet port of valve body 1, like this, when valve plate 2 was opened to horizontal position, the upper edge of valve plate 2 was just in time blocked by boss 12, had both made fluid produce fluctuation.Valve plate 2 can not produce in the opposite direction yet and rotate, and prevents the misoperation of valve plate 2 effectively.When preventing this closure of check ring, produce water hammer in the pipe network, at an end of valve shaft 10 damper rod 3 is installed at least, on the outer wall of valve body 1, be installed with the micro-resistance slowly-closed damping device 4 that matches with damper rod 3.In order to prevent that damper rod 3 and damping piston 17 from the rigidity collision taking place, at the front end of damper rod 3 or spring contact 16 of front end fixed installation of damping piston 17.Micro-resistance slowly-closed damping device 4 described in the utility model can be traditional water damper, also can be the single-acting cylinder hydraulic damper of spring action, also can be the compound micro-resistance slowly-closed damping device of hydraulic pressure, oil damping formula as shown in Figure 4.Hydraulic pressure as shown in Figure 4, the compound micro-resistance slowly-closed damping device of oil damping formula are: it comprises the cylinder body 19 that a left and right chamber is cascaded, and hydraulic piston 20 and damping piston 17 are housed in the left chamber of cylinder body 19, is fixed with cylinder cap 18 at the left end of cylinder body 19.In the right chamber of cylinder body 19, piston 21 is housed, piston rod 22 is installed between hydraulic piston 20 and piston 21 oil-storing cup 5 of an one-way throttle device is installed by oil guide pipe on the intermediate clapboard of cylinder body 19, promptly in this oil-storing cup 5 adjustable throttle orifice and one-way valve are housed, a catheter 6 is installed on the left end cylinder cap 23 of cylinder body 19, the other end of catheter is connected with valve body 1 and by catheter 6 the right chamber of cylinder body 19 and the entrance point inner chamber of valve body 1 is communicated, to guarantee having press liquid to pass through catheter 6 flows into cylinder body 19 from the inner chamber of valve body 1 inner chamber, by piston and piston rod damping piston 17 is released cylinder body 19, when damping piston 17 is pushed out cylinder body 19, oil in the oil-storing cup 5 is inhaled into the oil pocket of cylinder body 19 by oil guide pipe, when valve plate 2 is closed, when damper rod 3 affacts on the damping piston 17, damping piston 17 returns, oil in the cylinder body 19 is pushed back in the oil-storing cup 5 because the throttling action of throttle valve so just makes valve plate 2 reach the effect of micro-resistance slowly-closed effectively by oil guide pipe and throttle orifice.

Claims

1, butterfly plate formula safety check, it comprises valve body (1), valve plate (2), it is characterized in that: its valve shaft (10) is a horizontal axis, its two ends are installed on the valve body (1), the axis of valve shaft (10) is H (H＞O apart from the height of the non-return mouth center line of valve body (1), H is less than the non-return port radius R of valve body), at least be fixed with an axis hole (8) and a spacing card (13) at the back side of valve plate (2), between axis hole (8) and the valve shaft (10) elastic shaft sleeve (9) is housed, spacing card (13) is a U-shaped, and the U-groove bevel of spacing card (13) is stuck on the double groove (14) of valve shaft (10).

2, butterfly plate formula safety check according to claim 1 is characterized in that: be fixed with the seal ring that the cross section is a U-shaped [11] on the outside of valve plate (2).

3, butterfly plate formula safety check according to claim 2 is characterized in that: be fixed with a seal ring [7] on the non-return mouth of valve body (1).

4, butterfly plate formula safety check according to claim 1, it is characterized in that: the inner chamber outlet port of valve body (1) is fixed with boss [12].

5, according to claim 1 or 2 or 3 or 4 described butterfly plate formula safety check, it is characterized in that: the end at valve shaft [10] is installed with damper rod [3] at least, is installed with the micro-resistance slowly-closed damping device [4] that matches with damper rod [3] on the outer wall of valve body [1].

6, butterfly plate formula safety check according to claim 5 is characterized in that: be installed with spring contact [16] at the front end of damper rod [3] or the front end of damping piston [17].

7, butterfly plate formula safety check according to claim 5, it is characterized in that: the cylinder body [19] of micro-resistance slowly-closed damping device [4] is a left side, the series connection of right chamber is the structure of one, hydraulic piston [20] and damping piston [17] are housed in the left chamber of cylinder body [19], the left end of cylinder body [19] is fixed with cylinder cap [18], piston [21] is housed in the right chamber of cylinder body [19], hydraulic piston [20] and piston in cylinder body [19], piston rod [22] is installed [21], the oil-storing cup [5] of a band one-way throttle device is installed through oil guide pipe on the intermediate clapboard of cylinder body [19], between the left end cap [23] of cylinder body [19] and valve body [1], is installed with catheter [6].