CN202100821U - High-performance delay-close check valve - Google Patents

Abstract

The utility model relates to a high-performance delay-close check valve which comprises a main valve and a delay-close mechanism, wherein a swing check valve is adopted as the main valve; basically, one end of a rotating shaft of the main valve extends outside a valve body and is connected with the delay-close mechanism; the delay-close mechanism has a piston-type structure and consists of a cylinder body, a cylinder cover, a piston rod, a piston convex disc and a piston concave disc; one end of the piston rod is fixedly connected with the rotating shaft, and a T-shaped thread is arranged in the part of the other end of the piston rod arranged in the cylinder body; the piston convex disc and the piston concave disc are respectively provided with positive T-shaped thread and reverse T-shaped thread which are meshed with the piston rod; a convex block of the piston convex disc is movably matched with a concave hole of the piston concave disc; and piston cavities which are respectively arranged between the piston convex disc and the piston concave disc, between the piston convex disc and the cylinder body as well as between the piston concave disc and the cylinder cover are respectively communicated with three hole channels of a regulating valve. The high-performance delay-close check valve has the advantages of being low in close noise, stable in delay-close performance, convenient to install, simple in structure and the like. The high performance delay-close check valve is applicable to various control valves which are arranged on an outlet pipeline of a pump station and used for preventing medium from flowing back.

Description

The high-performance buffer valve

Technical field

The utility model relates to valve field, specifically about a kind of buffer valve.The utility model is applicable to the control valve that prevents on the pump discharge pipelines such as water supply, blowdown that medium from flowing backwards.

Background technique

Buffer valve is made up of the gentle locking mechanism of main valve; Main valve generally adopts Swing check valve, is installed on the main pipe, promotes flap by the forward medium and opens; Reverse media promotes flap and closes; Close in the closed procedure at flap, the closing velocity of Slow Close mechanism controls flap prevents flap closing velocity too fast and valve seat generation bump damage sealing surface and generation water hammer.Like the patent No. is the fluid power automatic control slope block-type Tiny Drag Slow Shut Check Valves of ZL201010253388.8, by valve body, valve gap and valve plate, the inclination valve seat that cooperates with valve plate is arranged in the valve body; The valve pocket below of valve seat front end is provided with a damping device; Said damping device is an oil hydraulic cylinder of being made up of cylinder body, cylinder cap, piston, piston rod and pressure spring, and pressure spring is arranged on piston rear end, makes to extend in the valve pocket of valve seat rear end at no external force effect lower piston rod front end; When valve plate is closed when touching piston rod; Pressure spring reduces the closing velocity of valve plate, prevents valve plate and valve seat bump, plays the Slow Close effect.Its shortcoming is that damping device adopts valve plate to touch the closing velocity that the piston rod pressure spring stops valve plate, can produce bigger collision sound when valve plate touches piston rod; The elastic force of spring is selected to have relatively high expectations, and in long-term opening-closing process, influence the Slow Close performance behind the spring fatigue; Damping device is installed in the valve body of main valve, and trouble, complex structure are installed.

Summary of the invention

The purpose of the utility model is the shortcoming that exists to existing technology, provides a kind of and closes that impact sound is low, Slow Close stable performance, high-performance buffer valve easy for installation, simple in structure.

The technological scheme of the utility model comprises the main valve locking mechanism that eases up, and main valve adopts Swing check valve, and said Swing check valve comprises valve body, valve seat, flap, running shaft, and flap is installed on the valve body by running shaft; Mainly be that an end of running shaft stretches out the valve body outside and is connected with Slow Close mechanism; Said Slow Close mechanism is a piston cylinder operator; Be made up of cylinder body, cylinder cap, piston rod, the protruding dish of piston, the recessed dish of piston, an end of piston rod is fixedly connected with running shaft, and the part of the piston rod the other end in cylinder body is shaped on T type screw thread; Protruding dish of piston and the recessed dish of piston are shaped on forward T type screw thread and inverted T-shaped screw thread and piston rod engagement respectively, and the projection of the protruding dish of piston cooperates with the shrinkage pool of the recessed dish of piston is movable; Protruding dish of piston cavity, piston between protruding dish of piston and the recessed dish of piston and the recessed dish of piston cavity, piston between the cylinder body and the piston cavity between the cylinder cap respectively with three mouth channel connections of modulating valve.

The utility model has the advantages that the recessed dish of protruding dish of piston through being shaped on forward T type screw thread and the piston that is shaped on inverted T-shaped screw thread simultaneously with the T type thread engagement of piston rod; Close in the closed procedure at flap; Running shaft drives the protruding dish of piston together with the piston rod rotation and the recessed dish of piston is drawn close; Hydraulic oil in the piston cavity between protruding dish of extrusion piston and the recessed dish of piston reaches damping function, makes flap slowly descending, avoids the collision with valve seat; Effectively the protection sealing surface with suppress water hammer, have that the noise of closing is low, a Slow Close stable performance, characteristics such as easy for installation, simple in structure.

Description of drawings

Fig. 1 is the structural representation of the utility model.

Embodiment

High-performance buffer valve as shown in Figure 1 comprises the main valve B locking mechanism A that eases up, and main valve B adopts Swing check valve, and said Swing check valve comprises valve body, valve seat, flap, running shaft 1, and flap is installed on the valve body by running shaft 1.One end of running shaft 1 stretches out the valve body outside and is connected with the A of Slow Close mechanism; The said Slow Close A of mechanism is a piston cylinder operator; Be made up of the protruding dish of cylinder body 4, cylinder cap 5, piston rod, piston 2, the recessed dish 3 of piston, an end of piston rod is fixedly connected with running shaft 1, and the part of the piston rod the other end in cylinder body 4 is shaped on T type screw thread; The protruding dish 2 of piston is shaped on forward T type screw thread and inverted T-shaped screw thread and piston rod engagement respectively with the recessed dish 3 of piston, and the projection of the protruding dish 2 of piston cooperates with the shrinkage pool of the recessed dish 3 of piston is movable.Close in the closed procedure at main valve B, the projection of the protruding dish 2 of piston moves in the shrinkage pool of the recessed dish 3 of piston; In the main valve B opening process, the projection of the protruding dish 2 of piston shifts out in the shrinkage pool of the recessed dish 3 of piston.The protruding dish 2 of piston cavity, piston between the protruding dish 2 of piston and the recessed dish 3 of piston and the recessed dish 3 of piston cavity, piston between the cylinder body 4 are communicated with three passwaies of modulating valve 6 respectively with piston cavity between the cylinder cap 5; Through adjustment modulating valve 6; Regulate the flow of hydraulic oil circulation; Reach the size of regulating damping force, the closing velocity of control flap.Running shaft 1 can directly extend to cylinder body 4 interior piston rods as the A of Slow Close mechanism, at this moment, the part of running shaft 1 in cylinder body 4 is made T type screw thread and the forward T type screw thread of the protruding dish 2 of piston and the inverted T-shaped thread engagement of the recessed dish 3 of piston.No matter be that running shaft 1 directly extends to cylinder body 4 interior piston rods as the A of Slow Close mechanism, or running shaft 1 rotates the Slow Close A of mechanism work through being fixedly connected with piston rod, all has same transmission effect.

Claims (2)

1. high-performance buffer valve comprises main valve (B) locking mechanism (A) that eases up, and main valve (B) adopts Swing check valve, and said Swing check valve comprises valve body, valve seat, flap, running shaft (1), and flap is installed on the valve body by running shaft (1); An end that it is characterized in that running shaft (1) stretches out the valve body outside and is connected with Slow Close mechanism (A); Said Slow Close mechanism (A) is a piston cylinder operator; Form by cylinder body (4), cylinder cap (5), piston rod, the protruding dish of piston (2), the recessed dish of piston (3); One end of piston rod is fixedly connected with running shaft (1); The part of the piston rod the other end in cylinder body (4) is shaped on T type screw thread, and protruding dish of piston (2) and the recessed dish of piston (3) are shaped on forward T type screw thread and inverted T-shaped screw thread and piston rod engagement respectively, and the projection of the protruding dish of piston (2) cooperates with the shrinkage pool of the recessed dish of piston (3) is movable; The recessed dish of piston cavity, piston (3) between the protruding dish of piston cavity, piston (2) between the protruding dish of piston (2) and the recessed dish of piston (3) and the cylinder body (4) is communicated with three passwaies of modulating valve (6) respectively with the piston cavity between the cylinder cap (5).

2. high-performance buffer valve according to claim 1 is characterized in that piston rod directly extends to cylinder body (4) by running shaft (1) and constitutes.

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