CN101936413B

CN101936413B - Hydraulic self-control inclined seat type micro-resistance slow-closing check valve

Info

Publication number: CN101936413B
Application number: CN2010102533888A
Authority: CN
Inventors: 甄宇宏
Original assignee: Anhui Tongdu Valve Co ltd
Current assignee: ANHUI TONGDU FLOW TECHNOLOGY Co Ltd
Priority date: 2010-08-09
Filing date: 2010-08-09
Publication date: 2012-04-25
Anticipated expiration: 2030-08-09
Also published as: CN101936413A

Abstract

The invention discloses a hydraulic self-control inclined seat type micro-resistance slow-closing check valve which comprises a valve body, a valve cover and a valve plate, wherein an inclined valve seat matched with the valve plate is arranged in the valve body, a buffer device is arranged below a valve cavity at the front end of the valve seat, the buffer device is a hydraulic cylinder consisting of a cylinder body, a cylinder cover, a piston rod and a compression spring, the compression spring is arranged at the rear end of the piston, so that the front end of the piston rod extends into the valve cavity at the rear end of the valve seat under the action of no external force, and a water inlet communicated with an inner cavity of the cylinder body is formed in. The buffering point of the invention is at the lower end of the valve plate, the force arm is long, the buffering device is small in stress and not easy to damage, the buffering effect is good, the water return pipeline is arranged outside the valve body, the filter and the throttle valve are easy to install, the closing speed of the valve plate is adjustable, the influence of a destructive water hammer on the pump can be eliminated, and meanwhile, the structure is simple and the processing is easy.

Description

Fluid power automatic control slope block-type Tiny Drag Slow Shut Check Valves

Technical field

The present invention relates to a kind of slope block-type Tiny Drag Slow Shut Check Valves that is used for the exit of pump of water-feeding drainaging line, specifically a kind of fluid power automatic control slope block-type Tiny Drag Slow Shut Check Valves.

Background technique

In liquid conducting pipes, generally all safety check is installed in case the solution stopping body flows backwards at delivery side of pump.Along with increasing of lift, termination of pumping moment, destructive water hammer also constantly increased, thereby people develop a kind of built-in piston to slow down the Tiny Drag Slow Shut Check Valves of closing velocity, was used for weakening or eliminated destructive water hammer and guarantee that pump is not destroyed.Because the impurity that contains different conditions in the transfer line is the phenomenon of the frequent cause clogging bypass tube of sewage particularly, cause the Slow Close effect undesirable or lose the Slow Close effect.At present, general Tiny Drag Slow Shut Check Valves is with internal or external damping device, most with oil or water as driven medium, lack long time stability, the time is long, is prone to hold inefficacy and produces destructive water hammer.

Summary of the invention

The purpose of this invention is to provide a kind of fluid power automatic control slope block-type Tiny Drag Slow Shut Check Valves, Slow Close is effective, can eliminate the damage that destructive water hammer causes pump, and long time stability are good, long service life.

The present invention is achieved in that and comprises valve body, valve gap and valve plate; The inclination valve seat that cooperates with valve plate is arranged in the valve body, and the valve pocket below of valve seat front end is provided with a damping device, and said damping device is an oil hydraulic cylinder of being made up of cylinder body, cylinder cap, piston and piston rod; The valve body below has the cylinder body mounting hole; The cylinder body front end stretches in the valve pocket through mounting hole, has water intake on the valve body of valve seat front end, has water intake on the cylinder cap and communicates with water intake on the valve body through pipeline; Be provided with pressure spring in the hydraulic pressure cavity of piston rear end, make to extend in the valve pocket of valve seat rear end at no external force effect lower piston rod front end; Piston rod axle center line is vertical with valve seat planes to be provided with; Filter and one-way throttle valve are housed on the said pipeline.When valve body is closed; Valve plate elder generation quick closedown several angle promotes to move behind the piston after touching piston rod then, makes that the water in the cylinder body is back in the valve body; Because the effect of pressure spring and the water resistance in the cylinder body make the valve plate falling speed slow down, thereby play the effect of Slow Close.Because rear end of the cylinder block places valve body outside, has both helped the installation and maintenance of cylinder body, also is easy to mounting filtering device and throttle valve on pipeline simultaneously, makes that the valve plate closing velocity is adjustable.

In order to prevent the piston rod stress deformation, piston rod axle center line is vertical with valve seat planes to be provided with.

That the present invention has concurrently is built-in, the advantage of external damping device, and the Point of Strength of buffering is in the lower end of valve plate, and the arm of force is long; Damping device is stressed little not fragile, good buffering function, and water return pipeline is located at outside the valve body; Be easy to mounting filtering device and throttle valve, the valve plate closing velocity is adjustable, can eliminate the influence of destructive water hammer to pump; Simultaneously simple in structure, be easy to processing.

Description of drawings

Fig. 1 is a structural representation of the present invention;

Fig. 2 is a damping device external pipeline structural representation;

Fig. 3 is the structural representation of valve plate of the present invention when state.

Embodiment

As shown in Figure 1, the present invention includes valve body 1, valve gap 12 and be located at the valve plate 13 in the valve body, valve plate 13 is in open mode among Fig. 1; The valve seat 17 that the inclination that cooperates with valve plate 13 is arranged in the valve body 1; Said damping device is an oil hydraulic cylinder, and oil hydraulic cylinder is made up of cylinder body 2, cylinder cap 26, piston 22, piston rod 21 and pressure spring 23, and valve body 1 below of valve seat 17 front ends has the cylinder body mounting hole; Cylinder body 2 stretches in the valve pocket 15 through mounting hole; Cylinder cap 26 parts of cylinder body 2 rear ends are fixed on the valve body 1 through bolt 24, have the water intake 25 that communicates with cylinder body 2 inner chambers on the cylinder cap 26, and pressure spring 23 is arranged in the hydraulic pressure cavity of piston 22 rear ends; Make to extend in the valve pocket 14 of valve seat 17 rear ends, have the water intake 16 that joins with damping device on the valve body 1 of valve seat front end at no external force effect lower piston rod 21 front ends.Fig. 2 is a damping device external pipeline structural representation.Pipe end 51 links to each other with water intake on the valve body, and pipe end 52 links to each other with water intake 25 on the cylinder cap 26, and gate valve 3, filter 4, one-way throttle valve 6 and gate valve 7 are housed in the pipeline 5 successively.Can regulate valve plate 13 closing velocities through regulating one-way throttle valve 6 flow sizes.

In order to prevent the piston rod stress deformation, cylinder body mounting hole shaft axis is vertical with valve seat 17 planes to be provided with better, works as valve closing, and when moving behind the valve plate 13 promotion piston rods 21, the radial component that piston rod 21 receives is minimum.

Its working principle is following: when throttle down; Valve plate 13 first quick closedown several angles; Its lower end is moved after touching piston rod 21 back promotion pistons 22 then; Pressure spring 23 is compressed, and the water in the cylinder body 2 is back in the valve pocket 15 through pipeline 5 simultaneously, and valve plate shown in Figure 3 13 positions are promptly in the closed position.Because the water resistance in the effect of pressure spring 23 and the cylinder body 2 makes valve plate 13 fallings speed slow down, thereby plays the effect of Slow Close.Arrow among Fig. 1 and Fig. 3 is represented water (flow) direction.

Claims

1. fluid power automatic control slope block-type Tiny Drag Slow Shut Check Valves; Comprise valve body (1), valve gap (12) and valve plate (13); The inclination valve seat (17) that cooperates with valve plate (13) is arranged in the valve body (1); Valve pocket (15) below that it is characterized in that valve seat (17) front end is provided with a damping device, and said damping device is an oil hydraulic cylinder of being made up of cylinder body (2), cylinder cap (26), piston (22), piston rod (21) and pressure spring (23), and valve body (1) below has the cylinder body mounting hole; Cylinder body (2) front end stretches in the valve pocket (15) through mounting hole; Piston rod (21) shaft axis is arranged on piston (22) rear end with vertical setting the in valve seat (17) plane, pressure spring (23), makes to extend in the valve pocket (14) of valve seat (17) rear end at no external force effect lower piston rod (21) front end; Have water intake (16) on the valve body (1) of valve seat (17) front end, have the water intake (25) that communicates with cylinder body (2) inner chamber on the cylinder cap (26), the water intake (25) on the cylinder cap (26) communicates with water intake (16) on the valve body (1) through pipeline (5).

2. fluid power automatic control slope block-type Tiny Drag Slow Shut Check Valves according to claim 1 is equipped with filter (4) and one-way throttle valve (6) on the said pipeline (5).