CN2295883Y

CN2295883Y - Silencing check valve

Info

Publication number: CN2295883Y
Application number: CN 97239583
Authority: CN
Inventors: 徐方田
Original assignee: Individual
Current assignee: Individual
Priority date: 1997-05-05
Filing date: 1997-05-05
Publication date: 1998-10-28
Anticipated expiration: 2007-05-05

Abstract

The utility model relates to a silencing check valve, composed of a left valve body (2), a right valve body (7), a closure member (10), a sealing cup (9), etc. The utility model is characterized in that a valve body is composed of the left valve body (2) and the right valve body (7), the middle parts of the two valve bodies are positioned through a rabbet and sealed through a rubber pad, and the two valve bodies are connected into integration through a flange. A valve seat is arranged on a left valve body, and the valve seat and an inlet flange surface are in a horn-shaped oblique opening of 30 DEG-60 DEG. A chute which is perpendicular to the surface of the oblique opening is processed, and the sealing cup is arranged in the chute to form a back stop prevention opening. Rubber is formed to the sealing cup through pressing, and the closure member is composed of a cone body of which one end is provided with a fixed guiding axle. A right valve body passage and the inner part of a right valve body cavity are respectively provided with a cross beam to fix a guide sleeve. The closing force uses the acting force of a compression spring.

Description

Damping check valve

The utility model belongs to a kind of new equipment in the logical machinery valve field, is the improvement to existing safety check.

In the system of the conveyance fluid that promotes with pump, power failure or other mechanical accident easily take place suddenly, flow backwards for preventing fluid, in the pump outlet port safety check must be installed.

At present, also have and use " Swing check valve ", this valve opening resistance is big, and closure member constantly knocks anti-reverse seam along with the pulse feature of fluid, and sealing surface and driving component are easy to wear, and noise is big, and the life-span is short, can not limit water hammer.

Since the eighties, domestic appearance multiple " Tiny Drag Slow Shut Check Valves ", their common characteristic are the closure member heavinesses, and opening resistance is bigger, and the slow closing device complexity is difficult for debugging; In use, what have can limit water hammer, and what have can not limit water hammer, and sealability is also unstable; When particularly tall building adds force feed water; water tank water has been expired the water pump autostop; water tank water has lacked water pump Auto Power On again; under the operating mode of frequent start and shutdown; slow closing device is just insensitive, easily produces water hammer, makes pipe-line system and valve itself be subjected to strong vibrations; noise is big, can not eliminate the noise.While valve body heaviness, volume is bigger, and structure is complicated again, and not easy to operate, cost is high again, and user and design office are reluctant to select for use.

The purpose of this utility model is exactly to overcome the defective that safety check exists in the existing technology, and design a kind of simple in structure, light and beautiful, noise free, check is reliable, damping is wear-resisting, the life-span is long, the processing maintenance operation is convenient, a kind of damping check valve safe and reliable to operation.

The utility model realizes that the above-mentioned purpose technological scheme is: valve body is formed in two sub-sections, and spacer flanger connects into integral body.The shape and structure of anti-reverse seam, sealing position, method, closure member and method for opening and closing, direction etc. are improved.Valve seat and suction flange face have 30 °～60 ° horn-like angles, the processing skewed slot vertical on the inclined-plane of valve seat with the inclined-plane, the seal bowl of in skewed slot, packing into, the seal bowl protruding terminus that rubber is made forms 30 °～60 ° horn mouth, this horn mouth is exactly anti-reverse seam, has elasticity, i.e. damping is eliminated the noise again and good seal performance, friction durability is long, and it is convenient to change.The sealing position of closure member is a cone, and preservative treatment will be done in the surface, along with the wearing and tearing of anti-reverse seam sealing surface, and changes closure member sealing surface position thereupon, reaches good seal, and the life-span is long.Respectively be provided with a crossbeam in left valve barrel passage and the right valve barrel chamber, can increase the intensity of valve body, fixing closure member guiding position guarantees that closure member is coaxial with anti-reverse seam again, accomplishes level or vertical unlocking and closes, and the keying position is accurate, the assurance sealing.In order to reach noise elimination, around the axis of guide, load onto the pressure spring of certain compression ratio, spring is compressed during unlatching, and fluid flows out along certain orientation, and spring promotes the rapid return non-return sealing of closure member during shutdown, stops fluid to flow backwards.Because water hammer pressure is not closed earlier before arriving, water hammer pressure is big again, and the centre does not have distance, and the water hammer peak value can not do work, and can not produce water hammer, and anti-reverse seam is rubber, plays cushioning effect, reaches noise elimination.The compression ratio of spring is decided according to valve specification, nominal pressure, reduces opening resistance as far as possible.

The utility model is compared with the prior art, have simple in structure, light and beautiful, good seal performance, limit hammer, damping, wear-resisting, noise elimination, advantage such as the life-span is long, the processing maintenance operation is convenient, cost is low can be used under any operating mode.

Below in conjunction with a description of drawings embodiment of the present utility model:

Fig. 1 is the structural drawing of the utility model plan view

Fig. 2 is the sectional view of the utility model plan view

Fig. 3 is the structural drawing of the utility model seal bowl

Fig. 4 is the structural drawing of the utility model closure member

Referring to Fig. 1, Fig. 2, the utility model is by left valve barrel (2), right valve barrel (7), closure member (10) seal bowl (9), pressure spring (5), the axis of guide (4), guide pin bushing (3) and guide pin bushing formations such as (6).Left and right valve body is made by cast iron, and both are located by seam, and rubber pad (11) sealing connects two flanges in aggregates with bolt; Suction flange (1) is located on the left valve barrel, and outlet(discharge) flange (8) is located on the right valve barrel, and valve seat is located at and becomes 30 °～60 ° loudspeaker angle on the left valve barrel and with the suction flange face, and oblique notches at this angle, and seal bowl (9) assigns in the skewed slot, has formed anti-reverse seam.

Referring to Fig. 3, seal bowl (9) is to use the rubber press forming, and size dimension is decided according to the valve specification, and the big end of seal bowl (9) inserts in the skewed slot, and small end becomes anti-reverse seam, and maintenance becomes 30 °～60 ° horn mouth inclined-plane with the suction flange face.

Referring to Fig. 4, closure member (10) is made up of the cone of an end band fixed guide axle, and sealing surface is done preservative treatment, and the other end is connected with the axis of guide (4), keeps coaxial; Under the effect of pressure spring (5), closure member is done level (dress crouches) or vertical (upright dress) motion along guide pin bushing, reaches opening and closing.

The utility model is that flange connects straight-through type, and working principle is that suction flange (1) joins with the pump pipeline, and outlet(discharge) flange (8) joins with output pipe.

Open and eliminate and open the pump water hammer

After the pump running, fluid enters check valve inlet by the pump pipeline, the strength that closure member (10) borrows fluid to flow promotes to have the pressure spring (5) of certain compression ratio, the axis of guide (4) that makes closure member (10) and connect is done level or vertical motion along guide pin bushing (6) and guide pin bushing (3), reaching closure member (10) opens automatically, because closure member (10) effect of spring force by compression, opening speed is slower, open degree progressively strengthens, thereby weakened the shock wave of import water pressure, played the generation that prevents to open the pump water hammer.

Close and eliminate pass valve water hammer

When pump was shut down, closure member (10) was under the effect of pressure spring (5), and return is closed rapidly, and after extreme water hammer pressure arrived, closure member (10) sealed already with anti-reverse seam, avoids taking place direct hammer.Again because anti-reverse seam is that rubber is made.Have elasticity, can weaken the impact of pressure of return water, again can damping, do not have noise, play the noise elimination effect, so be called damping check valve.

The utility model can use under any operating mode.

Claims

1, a kind of damping check valve that is used for the conveyance fluid pipe-line system, it is by left valve barrel (2), right valve barrel (7), closure member (10), seal bowl (9), axis of guide formations such as (4).It is characterized in that:

1, valve body is divided into left valve barrel (2) and (7) two part compositions of right valve barrel, seam location in the middle of two valve bodies, and rubber seal, flange connects into integral body;

2, valve seat is located on the left valve barrel and becomes 30 °～60 ° horn-like angle with suction flange face (1), and processes a skewed slot vertical with the angle face, and seal bowl (9) is contained in the groove, forms anti-reverse seam;

3, seal bowl (9) is horn-like with the rubber press forming;

4, closure member (10) is to be made of the metal cone that an end has a fixed guide axle, and sealing surface is done preservative treatment;

5, respectively establish a crossbeam in left valve barrel (2) passage and right valve barrel (7) chamber, fixedly guide pin bushing is used;

The strength of 6, closing is by having the active force of certain compression ratio and corrosion-resistant pressure spring.