CN85203748U

CN85203748U - Slow closing check valve

Info

Publication number: CN85203748U
Application number: CN 85203748
Authority: CN
Inventors: 李锡环
Original assignee: Individual
Current assignee: Individual
Priority date: 1985-09-11
Filing date: 1985-09-11
Publication date: 1987-06-03

Abstract

The utility model belongs to a check valve used for controlling the flowing direction of liquid, which is the improvement of a swing check valve which is the present universal product. The valve of the utility model has three functions that the valve of the utility model can prevent the water hammering breakage, and can reduce the abrasion of a machine element in the valve of the utility model; when the liquid flows across the valve of the utility model, the water head loss can be reduced to be quite small. The valve of the utility model is characterized in that a rocker shaft is lengthened and is changed into a spline shaft; the outer extending end of the rocker shaft is driven by a swing cylinder which takes the liquid stricken out by a pump as the energy resource without the necessity for any additional energy resources. The part of the spline shaft in the valve of the utility model is fixedly connected with the valve clack via a plurality of elements, and thus the valve clack can be driven by the swing cylinder in operation; when screwed up, the valve of the utility model can achieve the peak; when shut down, the valve of the utility model can be closed slowly.

Description

Slow closing check valve

Affiliated technical field: the utility model belongs to the safety check of controlling liquid flow direction, is the improvement of current universal product Swing check valve door.

The state of the art: present widely used H44 ^T _X---10 type Swing check valves, see accompanying drawing 14, its shortcoming is: easy generation water hammer in service, destroy valve body and pipeline.This kind valve is opened inspection after using some months, find that the rotary part wearing and tearing of bearing pin, pivoted arm, clack valve are all more serious, and this valve loss of head is bigger.

Through looking into this valve improvement product and foreign patent at home, do not find the structure identical with the utility model.

The purpose of this utility model:

1. for preventing that water hammer from destroying safety check and connecting pipeline thereof.

2. loss of head in the valve body is reduced to very little.

3. machine members in the valve body is reduced to very little.

Content of the present utility model: (with reference to accompanying drawing and description of drawings)

This check valve body structure is passed through mutually with straight tube by elbow and is formed, and the valve body profile is seen Fig. 1, Fig. 2.In elbow body central position spline spindle is installed, is seen other part 8 among Fig. 3 and Fig. 5, the outer swing cylinder rotor of the affixed valve body of this axle one end is seen other part 1 among Figure 11 and Figure 12; This axle affixed pivoted arm of part in valve is seen other part 2 among Fig. 3 Fig. 5.

See Fig. 1 when turn on pump, the pressured fluid that (pump is very near from this valve, but does not draw) pumps is guided to tubule 5 by bassoon 3 tubule 4 of flowing through, and sees Figure 13 immediately, still can see pipe 5, notices that it is the detail drawing of pipe 5.Pressured fluid enters the swing cylinder pressure chamber from managing 5 through too small safety check 6, is used for promoting moving plate 7, and moving plate 7 drives rotor 1 and rotates, and rotor drives main shaft 8 rotations by spline again, and the working procedure of this moment is seen Fig. 5, Fig. 6, Fig. 7.Main shaft 8 rotates pivoted arms 2, and pivoted arm 2 is mentioned little valve gap 10, and little valve gap 10 can drive big clack valve 9, pumps out liquid this moment and also can promote clack valve and revolve and open.In a word, because main shaft drives and liquid thrust makes part such as clack valve be raised to apical position Fig. 7.The visible Figure 13 valve of swing cylinder when apical position is opened, this moment moving plate 7 and stator 11 driving fits, and the result of driving fit can make in-cylinder pressure liquid not leak, and also can guarantee the moving plate location.Because this position clack valve rises to peak and sees Fig. 4 and Fig. 7, apparent, liquid is similar to by straight length during by this valve, so loss of head is very little, again since clack valve no longer swing, so the interior component wear of valve is very little.

This valve runs into normal termination of pumping in the middle of using.Termination of pumping behind the gate valve of pass earlier.After the termination of pumping, pump and safety check internal pressure drop to P=0, and clack valve can return to closed position by gravity, also can natural leak as for liquid in the swing cylinder, and the possibility that does not stop clack valve to descend.

When the pump dead electricity causes suddenly when out of service, liquid begins to reflux, and manifold pressure descends a lot, and this valve is by following method realization Slow Close.See Figure 13.Lead to the little safety check 6 on the swing cylinder pipeline 5, be drilled with little throttle orifice on its clack valve, there are two effects in this hole: one in order to give swing cylinder pressure chamber release pressure, make swing cylinder can not control clack valve gravity, so clack valve descends.Its two, for throttling, make that liquid refluxes at a slow speed in the swing cylinder, thereby the swing cylinder moving plate turns round at a slow speed, to reach the purpose of control clack valve Slow Close.The pass closed procedure of clack valve is seen Fig. 8, Fig. 9, Figure 10.This valve is seen Fig. 9, Figure 10 during near closed position, and big clack valve 9 closes earlier, and close little valve gap 10 backs.This method of closing is additional again anti-water hammer measure after big clack valve Slow Close---little valve gap lags behind and closes a pressure release effect of recurrence.Also be when little valve gap is closed under the situation of orifice restriction damping, therefore close also very slow.

Comprehensively above-mentioned, use this valve and can reduce to very little to water hammer.

Relevant data:

Little safety check throttle diameter is regulated in 0～3.5 millimeter.

The Slow Close time was regulated in 2～12 seconds.

Above-mentioned safety check and swing cylinder adopt clearance seal entirely, can reduce rotational resistance.

Establish the purpose of safety valve 12 in the pipeline 5: prevent big clack valve 9 when closed by impact of water, can cause pressure surge in the swing cylinder.

If above-mentioned safety check is changed to piston cylinder to swing cylinder, its effect is approaching, but two shortcomings are arranged:

1. complex structure is to the wet environment incompatibility.

2. running resistance is big, and is dumb.

Description of drawings:

Fig. 1 is the embodiment's of an a kind of equipment of the present utility model plan view.

Fig. 2 is the attached view of equipment shown in Figure 1.

Fig. 3 is the A-A sectional view (closed position) of Fig. 2.P represents to be subjected to hydraulic directio (the same expression of figure later on) among the figure.

Fig. 4 is the A-A sectional view (enable possition) of Fig. 2, and V represents liquid flow path direction (the same expression of figure later on) among the figure.

Fig. 5～Fig. 7 represents the opening process of valve.

Fig. 8～Figure 10 represents the pass closed procedure of valve.

Figure 11 is the B-B sectional view of Fig. 1.

Figure 12 is the C-C sectional view (the swing cylinder position of correspondence during Fig. 3 closed position) of Fig. 1 and Figure 11.

Figure 13 is the C-C sectional view (during Fig. 4 enable possition the swing cylinder position of correspondence) of Fig. 1 and Figure 11.

Claims

1, a kind of buffer valve, clack valve are rotary-open type.It is characterized in that being equipped with swing cylinder.This swing cylinder structural feature is: its inner rotation part all adopts clearance seal.The power resources of swing cylinder are: the promotion that is stressed of the pressured fluid of pump self, swing cylinder rotor, and it is promptly sealed to forward the terminal pressure chamber to, and rotor-position is fixed simultaneously.Big clack valve and little valve gap is implicative of each other, servo-actuated to be to finish function separately in this valve.Big clack valve can fully revolve in the valve space that 90 degree elbows constitute and open.

2, according to right 1 described valve, it is characterized in that: adorn little safety check on the little pipeline of control swing cylinder, bore an aperture on its clack valve.By the liquid of this little safety check, when forward flow, can pass through smoothly, when reverse flow, but its aperture throttling of little closure of check ring.