CN1026914C - Automatic non-resistance check valve and use method thereof - Google Patents

Abstract

The present invention relates to a novel check valve, namely an automatic non-resistance check valve and a use method thereof, which is suitable for a pressure pipeline for feeding (conveying) water (oil) at a pump outlet and other various pipelines for conveying liquid. The automatic non-resistance check valve is composed of main parts of a valve cavity, a valve plate, a bearing plate, a hinge shaft, etc. and can replace the conventional check valves and plate valves. In a pump device, the automatic non-resistance check valve can have many functions, and simultaneously replaces a check valve, a plate valve, a pipe outlet flap valve, and a water hammer arrestor or a slow-closure butterfly valve for preventing water hammer damage at the time of a high lift. When the automatic non-resistance check valve is applied to a pressure pipeline at a pump outlet, for the use method, a pressure distributing valve with simple installation structure can enlarge millions upon millions of times of the actuating force for opening and closing a valve, reduce the size of a valve body, and decrease the manufacturing cost of the valve.

Description

Automatic non-resistance check valve and use method thereof

The present invention is a kind of novel check valve.New type check valve mainly is applicable to the pump discharge pressure pipeline of confession (failing) water (oil); New type check valve also is applicable to other various pipelines of carrying liquid.

Check valve commonly used all is to finish the keying task by the motion of a shaping type flap, can be divided into rise-fall type and rotary-open type two classes according to the flap characteristics.Existing check valve blocks water because of flap, and hydraulic loss (energy loss) is very big, has human to add control mechanism control flap in recent years, increases the aperture of flap, but complex structure, and must open and close by power; The way that has human to increase valve pocket abroad reduces the flap current obstruction area, still, because of flap will dash by current, and certainly will cause the pipe diameter sudden change after increasing valve pocket, therefore, and still unavoidable bigger hydraulic loss, and complex structure.

The objective of the invention is to design a kind of no energy consumption (or not having energy consumption substantially), automatic on-off, simple in structure, low cost, Applicable scope is extensive, and the new type check valve of energy multi-purpose valve.

The principle of automatic non-resistance check valve of the present invention is: valve body constitutes (seeing accompanying drawing 1,2,3) by valve seat 1, valve gap 2 and installation cover plate 3, valve plate 4, bearing plate 5, hinge 7 etc.Valve seat, valve gap and installation cover plate surround valve pocket, and in the valve pocket, valve plate and bearing plate join together with bolt 6, or direct cast solid, and can rotate around hinge.Bearing plate and valve gap sidewall form clearance seal, valve pocket is divided into inner chamber and exocoel, the connecting tube that exocoel connects certain diameter and certain-length by aperture 8 pipeline behind the logical valve, there is pipe connecting flange 9 at the valve body two ends, in order to connecting pipe, when liquid is crossed valve or is flowed to variation, the pressure of exocoel is adjusted automatically in the valve body, and forms certain pressure reduction, promotes the bearing plate rotation, the motion of drive valve plate realizes the valve automatic on-off.During normal the operation, valve insertion pressure is greater than outer cavity pressure, and valve is in full-gear.Valve seat bottom processing annular valve board slot, setting-in seal ring 10 in the groove is when valve plate and bearing plate are used Bolt Connection, the screw rod stage casing is as bearing pin, and the valve plate screw cooperates with pin slide, like this, valve plate can be done axial fine motion, and valve plate is adjacent to the valve plate groove when closing valve, so as to the pipeline of obturaging.

Automatic non-resistance check valve is compared with conventional check valve, and main feature is on the structure: do not dashed or the flap of external force pull-up by waterpower; Valve pocket is outside tube wall, and valve plate is not lifting moving or swing in pipe, but hinge rotates outside pipe.

When automatic non-resistance check valve was used in the pump discharge pressure pipeline, the voltage distribution valve that multi pack is simple in structure can utilize pump power (but not consuming energy) dexterously, the necessary width of bearing plate is reduced, thereby reduce body size; When body size was identical, the dress voltage distribution valve can shorten external connecting tube length, or increased bearing plate and make braking torque.

Automatic non-resistance check valve valve body, valve plate, bearing plate and voltage distribution valve can be cylinder iron or other metallic material and high-strength nonmetallic material make; Hinge is made of carbon steel, and chrome-faced also can be made of high-strength nonmetallic material, fraising dress copper or nonmetallic material lining; Valve plate groove inner seal ring is made of copper or high-strength nonmetallic material.

Embodiment (1) automatic non-resistance check valve is used for the pump discharge pressure pipeline.

Contrast check valve schematic diagram (accompanying drawing 1) and application scheme of installation (accompanying drawing 4), a is a pump, and b is the pump inlet pipeline, and c is the pump discharge pipeline, and d is an automatic non-resistance check valve, and e is a voltage distribution valve, and f joins the pressure piston in the voltage distribution valve.The check valve inner chamber leads to pump discharge, and exocoel connects voltage distribution valve by aperture 8 and connecting tube g.The pump prestart, check valve is in closed condition; During the pump starting, the pump case internal pressure greater than valve after pressure in the pipeline, join the pressure piston stroking upward, at this moment valve insertion pressure equals pump discharge pressure, and exocoel is communicated with the pump inlet pipeline because of the voltage distribution valve effect, outer cavity pressure equals pump inlet pressure, interior exocoel pressure reduction (water column) equals pump and closes dead point lift (zero delivery lift), and this differential pressure action forms in bearing plate makes a concerted effort, and it is made braking torque and can accurately calculate hinge.Overcome bearing plate and valve plate dead-load moment and valve plate and valve plate groove, free bearing position friction torque as braking torque, promote bearing plate and drive valve plate and rotate Open valve around hinge; Behind the valve opening, interior exocoel pressure reduction (water column) approximates the pump operation lift, and this pressure reduction continues to overcome deadweight and friction torque, forwards to and keeps full-gear until valve plate.During termination of pumping, join the pressure descent of piston, cut off being communicated with of check valve exocoel and pump inlet pipeline automatically, and make it to connect pipeline behind the valve, at this moment bearing plate is under reverse differential pressure action, by throttle down.When closing, except that interior exocoel pressure reduction for doing the braking torque, the dead-load moment of bearing plate and valve also becomes makes braking torque, so can guarantee valve full cut-off, sealing, and be beneficial to pump starting and vacuumize, so automatic non-resistance check valve can substitute check valve, plate valve or the flap valve of routine simultaneously; Because of being subjected to the connecting tube conveyance capacity, the rotational velocity of bearing plate controls again, by design or adjusting, can make the valve Slow Close, eliminate termination of pumping water attack harm, therefore for the high-head pump device, automatic non-resistance check valve is installed is save water-hammer arrester or buffer butterfly valve and other slow-closure type valves.

Embodiment (2) automatic non-resistance check valve is used to carry the pipeline of liquid.

Contrast check valve schematic diagram (accompanying drawing 1) and application scheme of installation (accompanying drawing 5), h is a pipe-line for conveying liquids, and g is connecting tube, and d is an automatic check valve.The valve insertion leading portion of threading a pipe, exocoel was communicated with a distance pipeline point behind the valve through connecting tube.When the liquid forward flow, valve insertion pressure promotes bearing plate and valve plate and rotates around hinge greater than outer cavity pressure, makes valve be in full-gear; When liquid flows when reverse, outer cavity pressure is greater than chamber pressure, and valve plays non-return effect oppositely cutting out gradually under the start moment loading.As the connecting tube changing-over, and can realize two-way non-return.

When automatic non-resistance check valve was used for pipe-line for conveying liquids, the necessary length of connecting tube was determined as calculated; Or, calculate the necessary width of bearing plate according to certain service condition, and suitably strengthen, to guarantee that valve reliably opens and closes.

Design concept novelty of the present invention, waterpower loss simple in structure, no is the power automatic on-off with flow stream pressure in the pipeline.Compare with conventional check valve, do not consume energy, cost is low, and maintenance is convenient, need not manpower or electronic keying.The check valve of the alternative routine of automatic non-resistance check valve also can substitute plate valve; But when being used for the pump discharge pressure pipeline and multi-purpose valve, substitute check valve, plate valve, pipe outlet flap valve and high-head pump device water-hammer arrester or other slow-closure type valves simultaneously.

Claims (6)

1, a kind of novel automatic non-resistance check valve is characterized in that valve pocket outside tube wall, dress circular valve plate in the cavity, and establish hinge, valve plate rotates around hinge and finishes keying; Valve body is made up of valve seat, valve gap, installation cover plate, circular valve plate, bearing plate and hinge, and valve seat, valve gap, installation cover plate surround valve pocket; Circular valve plate and pressure-bearing join together in the valve pocket, and bearing plate is divided into inner chamber and exocoel with valve pocket, and the valve exocoel has an aperture, can external certain diameter and connecting tube of certain-length, and pipeline behind the logical valve; Automatic non-resistance check valve is a power with flow stream pressure in the pipeline, promotes bearing plate and drive circular valve plate to rotate, and opens and closes automatically valve.

2, by the described automatic non-resistance check valve of claim (1), it is characterized in that valve pocket is to be surrounded by valve seat, valve gap and installation cover plate, valve pocket is outside pipeline.

3, by the described automatic non-resistance check valve of claim (1), it is characterized in that dress circular valve plate in the valve pocket, circular valve plate and bearing plate are joined together by bolt (bearing pin) or direct cast solid.

4, by the described automatic non-resistance check valve of claim (1), it is characterized in that valve plate and bearing plate link, and can rotate around hinge.

5,, it is characterized in that valve seat bottom processing annular valve board slot, setting-in seal ring in the groove by the described automatic non-resistance check valve of claim (1).

6,, it is characterized in that valve body, valve plate, bearing plate can be cylinder iron or other metallic material, also available high-strength nonmetallic material by the described automatic non-resistance check valve of claim (1); Hinge is with carbon steel and chromium plating, also available high-strength nonmetallic material; Fraising dress copper or nonmetallic material lining; Valve plate groove inner seal ring is with copper or high-strength nonmetallic material.

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