CN1847708A - Majae non-return valve - Google Patents

Abstract

The majae non-return valve has the pressure difference on two sides of the valve clack utilized for make-and-break in the direction opposite to the fluid flow so as to avoid the impact and water hammer on the valve clack. The majae non-return valve includes valve body, valve clack, valve seat, sleeve, sleeve cover, guide cover, spoke shaped rack, pulse duct, bearing housing, sealing ring, closure head assembly and fastener. The valve clack with I-shaped longitudinal section can move inside the sleeve like a piston. When fluid enters the valve in the forward direction, the fluid penetrates the rectangular opening on the sleeve wall to form axial pressure difference to drive the valve clack reversely so as to open the valve. When fluid moves inversely, partial fluid crashes into the cavity in front of the valve clack and the valve clack under the action of pressure difference moves in forward direction to shut off the valve. The present invention has simple structure, reliable operation and other advantages.

Description

The formula that liquidates safety check

Technical field

A kind of formula safety check that liquidates is used for FLUID TRANSPORTATION or hydraulic control pipeline, in case the fluid stopping body flows backwards.Belong to engineering element or field of components.

Background technique

Safety check (also claiming one-way valve or check valve) is the primary element in FLUID TRANSPORTATION or the hydraulic control engineering, uses very extensive.Its fundamental function is to prevent fluid to flow backwards, and guarantees that ducted fluid machinery or device normally work effectively.Yet, often very high in the conventional check valves as component (as flap or the flap) movement velocity that opens and closes motion, under some occasions, particularly in big flow, big flow velocity or long pipe runs system, can produce huge hydrodynamic pressure fluctuation moment, maximum value may reach the pipeline normal pressure and (be commonly referred to as water hammer) more than six times, the surge pressure that brings thus will be along whole pipeline system bamboo telegraph, and, cause the whole tubing concussion or produce catastrophic consequence in system boundary (as the pipeline turning point) reflection.On the other hand, the bump that too fast motion causes (being commonly referred to as the flap bump) may cause the safety check component, even whole damage, inefficacy.

At present, reducing keying component movement speed way commonly used is to install damper additional, and it comprises several forms such as mechanical damping formula, waterpower damped type and mixing damped type.The Chinese patent of U.S.'s Westinghouse Electrical Corp. application " safety check of surge suppressing " (CN85107737), Amada Co., Ltd. weighing apparatus field make the patent " non-water hammering check valve device " of being applied for (CN95197534), the patent " a kind of novel safety check Slow Close control system " of Dadao Science and Technology Co., Xiangfan Water Supply General Co.'s application (CN00229036.7) all belongs to the mechanical damping formula, promptly adds shock mount and lever system in safety check.Its advantage is that the damper damping characteristic is easy to set by mechanical structure; And shortcoming is the increase along with rate of flow of fluid in the pipeline and flow, and corresponding damping mechanism will become huge, complicated, and along with the widening of pipeline flow, change in flow territory, and the low side open and shut characteristic can severe exacerbation, even can't normally open and close.Another kind of form as " the energy-conservation hammer safety check that disappears " (CN03212010) and " a kind of water conservancy diversion safety check " (CN92209044) all belong to the waterpower damped type, promptly by certain specified structure, moving element must be done work to certain segment fluid flow when finishing switching motion, thereby reduce the kinetic energy of moving element, reach to prolong and dam the time and alleviate the purpose that flap clashes into.The advantage of this scheme is that check valve structure is simple, the operational reliability height; Shortcoming is fluid complicated movement in valve body, and its waterpower damping characteristic is difficult to reach the regulation requirement by the parametrization design, and determines its open and shut characteristic by prototype test, will cause design cost to increase; In addition, required damping is directly proportional with pipeline flow velocity, flow, and the damping that the waterpower damper can provide roughly is directly proportional with pressure pocket inner fluid lifting surface area (being presented as the pressure pocket volume), hole area is inversely proportional to damming, because valve body structure restriction, unlimited to enlarge pressure pocket volume and the minimizing hole area that dams impossible often, causes most of waterpower damped type safety check can not be applicable to big flow, big flow velocity and the pipeline that the pipeline physical dimension is had the lower limit requirement.The mixing damper is attempted the mutual supplement with each other's advantages by above-mentioned two kinds of dampers, optimizes the open and shut characteristic of safety check, but does not make a breakthrough as yet or the application achievement.

Summary of the invention

The objective of the invention is to disclose a kind of formula safety check that liquidates, it is the safety check that is different from other waterpower damped type safety check principle, the new design principle that is adopted makes it also have advantages such as simple in structure, reliable, that cost performance is reasonable when effectively avoiding phenomenons such as described water attack and flap bump.

This formula safety check that liquidates utilizes stepped piston formula flap and fluid reversing motion, that realizes flap and fluid liquidates motion (promptly, the moving direction of flap is opposite with the moving direction of fluid), when guaranteeing fluid along the pipeline forward flow, flap upstream moves and finishes the valve opening function; And when the fluid reverse flow, flap is in face of fluid motion, with fluid mutually under the effect of mutual damping, finish closing motion, thereby avoided flap bump and water hammer.

The main structure of the formula that liquidates safety check comprises valve body, flap, valve seat, sleeve, socket cover, air guide sleeve, spoke shape support, impact tube, bearing housing, seal ring, closure head assembly and fastening piece.Wherein, flap is the solid of rotation of a vertical section for " worker " font, under the effect of fluid pressure difference, can do opening and closing motion vertically in sleeve.Its enlarged diameter section plays " stepped piston " effect, and the sealing surface that processes on the reduced diameter section axial outer end face can constitute a pair of sealing pair with the transverse sealing face of valve seat in the sleeve, and processes the center hole of axial perforation, bearing housing of interpolation.Sleeve is a static element, its inwall is stepped cylndrical surface, one side is used for cooperating (similar " cylinder " inwall contacts with " piston " periphery) with the circumferential surface motive sealing of the enlarged diameter section of flap, opposite side processes one section Short Cylinder Surface near the place, end, installs valve seat and spoke shape support in it successively; Process the rectangular large area opening on the barrel in sleeve stage casing, pass through for fluid.Spoke shape support has a center screw, and through hole on every side forms the fluid passage.The pipe that impact tube is one one end sealing, an end is uncovered, two ends are processed with outside thread, process a plurality of through holes near on the tube wall of closed end.Impact tube is a link, is again a functor; The outside thread of its open-mouth end can screw in the center screw of the spoke shape support that sleeve ends installs, and closed end penetrates from the center hole of flap reduced diameter section, and passes bearing housing and socket cover, is screwed in the axial centre screw of air guide sleeve; So the inner tube wall of socket cover inwall, flap enlarged diameter section end face and sleeve crosses a chamber, this chamber only can be communicated with fluid by the through hole on the impact tube closed end tube wall.Check valve body is a housing that inner chamber is smooth, two import and export that openings is a fluid of coaxial line." head " (air guide sleeve end) of the said modules that fuses by impact tube inserts from the valve outlet end, enters the valve outlet exterior edge face until spoke shape support exterior edge face.

According to usage requirement, valve body structure has " Three way type " and " straight-through type " two kinds, and the opening on the former sidewall need be used the closure head assembly shutoff.

Fluid line of the present invention is housed, when fluid when forward enters safety check, described chamber is a low pressure area, fluid passes through the rectangular large area opening on the sleeve wall, because flap is different with valve-seat diameter, it is poor to form an axial pressure before and after flap, and drives the flap backward motion, and safety check is opened; When fluid in pipeline during backward motion, segment fluid flow passes spoke shape support, act on flap reduced diameter section axial outer end face, segment fluid flow pours described chamber through impact tube uncovered, increased the pressure in it, so flap is under the effect of large and small diameter section end face pressure reduction, longshore current road positive movement is closed safety check; In one process of back, fluid and flap relative movement also play damping function.The fluid motion theory is pointed out: when impact tube internal diameter (being equivalent to throttle orifice) is reasonable in design, flap reduced diameter section end face is when contacting with sealing surface of seat in the sleeve, the momentum of flap and fluid is all very little, thereby satisfies the requirement that not only block fluid flows backwards but also do not produce bump and water attack.

Description of drawings

The formula that the liquidates check valve structure schematic representation of Fig. 1 and pipeline welding

The formula that the liquidates check valve structure schematic representation that Fig. 2 is connected with piping flange

Embodiment

Provide preferred implementation of the present invention below, and be illustrated in conjunction with the accompanying drawings.

As shown in Figure 1, 2, the liquidate main structure of formula safety check comprises valve body l, flap 2, sleeve 3, valve seat 4, socket cover 5, air guide sleeve 6, spoke shape support 7, impact tube 8, bearing housing 9.Wherein, flap 2 is vertical section solid of rotation for " worker " font, under the effect of fluid pressure difference, can do opening and closing motion vertically in sleeve 3.Its enlarged diameter section plays " stepped piston " effect, and the sealing surface that processes on the reduced diameter section axial outer end face can constitute a pair of sealing pair with the transverse sealing face of valve seat 4 in the sleeve 3, and processes the center hole of perforation vertically, bearing housing 9 of interpolation.Sleeve 3 is static elements, its inwall is stepped cylndrical surface, one side is used for cooperating (similar " cylinder " inwall contacts with " piston " periphery) with the circumferential surface motive sealing of the enlarged diameter section of flap 2, opposite side processes one section Short Cylinder Surface near the place, end, installs valve seat 4 and spoke shape support 7 in it successively; Process the rectangular large area opening on the barrel in sleeve 3 stage casings, pass through for fluid.Spoke shape support 7 has a center screw, and through hole on every side constitutes the fluid passage.The pipe that impact tube 8 is one one end sealings, an end is uncovered, two ends are processed with outside thread, process a plurality of through holes near on the tube wall of closed end.Impact tube 8 is a link, is again a functor.The outside thread of its open-mouth end can screw in the center screw of the spoke shape support 7 that sleeve 3 ends install, and closed end can penetrate from the center hole of flap 2 reduced diameter sections, and passes bearing housing 9 and socket cover 5, is screwed in the axial centre screw of air guide sleeve 6; So the enlarged diameter section end face of socket cover 5 inwalls, flap 2 and the inner tube wall of sleeve 3 cross a chamber one by one, this chamber only can be communicated with fluid by the through hole on the impact tube 8 closed end tube walls.Valve body 1 is a housing that inner chamber is smooth, two import and export that openings is a fluid of coaxial line." head " (air guide sleeve 6 ends) of the said modules that fuses by impact tube 8 insert from the outlet end of valve body l, enter the exterior edge face of valve body 1 until the exterior edge face of spoke shape support 7.

According to usage requirement, the present invention is connected two kinds of forms with the welding that is connected with of pipeline enclosure with flange.For the former, for ease of maintenance, adopt structure shown in Figure 1, promptly valve body 1 is " Three way type ", and the opening on the sidewall need be used seal ring 10 and closure head assembly 11 shutoff; And structure shown in Figure 2 helps the dismounting of safety check, also need not opening on the sidewall.

New design principle of the present invention makes it also have advantages such as simple in structure, reliable, that cost performance is reasonable when effectively avoiding phenomenons such as described water attack and flap bump.

Claims (1)

1. the formula safety check that liquidates is characterized in that: flap (2), sleeve (3), valve seat (4), socket cover (5), air guide sleeve (6), spoke shape support (7), impact tube (8), bearing housing (9) are housed in its valve body (1); Wherein, flap (2) is the solid of rotation of a vertical section for " worker " font, can do the keying campaign of similar cylinder inner carrier in sleeve (3) vertically; The sealing surface that processes on the reduced diameter section axial outer end face can constitute a pair of sealing pair with the transverse sealing face of the interior valve seat of sleeve (3) (4), and processes center hole vertically, a bearing housing of interpolation (9); Sleeve (3) is a static element, its inwall is stepped cylndrical surface, one side is used for cooperating with the circumferential surface motive sealing of the enlarged diameter section of flap (2), and opposite side processes one section Short Cylinder Surface near the place, end, installs valve seat (4) and spoke shape support (7) in it successively; Process the rectangular large area opening on the barrel in sleeve (3) stage casing; Spoke shape support (7) has a center screw, and the through hole around it constitutes the fluid passage; The pipe that impact tube (8) is one one end sealing, an end is uncovered, two ends are processed with outside thread, and process a plurality of through holes near on the tube wall of closed end; The outside thread of its open-mouth end can screw in the center screw of the spoke shape support (7) that sleeve (3) end installs, closed end can penetrate from the center hole of flap (2) reduced diameter section, and pass bearing housing (9) and socket cover (5), be screwed in the axial centre screw of air guide sleeve (6); Valve body (1) is a housing that inner chamber is smooth, two import and export that openings is a fluid of coaxial line; Air guide sleeve (6) end of the said modules that fuses by impact tube (8) inserts the exterior edge face that enters valve body (1) until the exterior edge face of spoke shape support (7) from the outlet end of valve body (1).

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