CN2402893Y

CN2402893Y - Slow-closing control system for non-return valve

Info

Publication number: CN2402893Y
Application number: CN 00229036
Authority: CN
Inventors: 卢咏林
Original assignee: Individual
Current assignee: Individual
Priority date: 2000-01-06
Filing date: 2000-01-06
Publication date: 2000-10-25
Anticipated expiration: 2010-01-06

Abstract

The utility model relates to a novel slow-closing control system for non-return valves, particularly a slow-closing control system which utilizes a buffering hydraulic cylinder to control the closing time of the non-return valve. The utility model comprises a control device and the buffering hydraulic cylinder which is connected with the control device by a high-pressure flexible pipe. The utility model is characterized in that the control device is connected with a safety detection device; a piston of the buffering hydraulic cylinder is in floating connection with a piston position sensor. The utility model has the advantages that the action reliability is high, the check valve has no impact, no vibration and no noise when in closing, the slow-closing process can be observed, and the utility model is safely and reliably detected when check valve is opened.

Description

A kind of novel safety check Slow Close control system

The utility model relates to a kind of novel safety check control system, particularly utilizes the buffering hydraulic cylinder buffer valve of control closure of check ring time.

Buffer valve is a kind of important safety equipment that the fluid control loop generally uses, be specially adapted to resemble the pipe network system of the such heavy caliber of water-supply systems, big flow, purpose is to be controlled at bottom line for the water hammer pressure of in time refluence of medium in the pipe network is closed, prevented to delivery side of pump after the pump motor sudden power and produce during with valve closing, ensures safety in production.

Its Slow Close control mode of existing buffer valve mainly contains the direct-type throttling control mode of directly utilizing pipeline internal medium and is filling hydraulic oil between buffering hydraulic cylinder and the throttling control valve between again with the buffering hydraulic cylinder on insulating liquid cylinder pressure, this oil hydraulic cylinder and the valve, driving insulating liquid cylinder pressure, isolated throttling control mode by the control of the hydraulic transmission between two cylinders buffering hydraulic cylinder with pipeline internal medium.Direct-type throttling control mode is simple in structure, but the user generally reflect exist that damper piston is stuck, flow controller stops up, the malfunctioning phenomenon of buffer control system; Though isolated throttling control mode has been used hydraulic oil (or edible oil), but remain logical atmosphere in an other chamber of cushion dashpot and isolation cylinder and use pipeline internal medium, not the problem of the system down that causes from reasons such as the corrosion of basic solution part, flow controller obstruction, seizure of pistons.The deficiency of these two kinds of control mode maximums is: 1, the position of damper piston in valve can't be observed, so can not affirm whether flow controller stops up, whether piston is stuck or is not in normal buffer position, therefore, its reliability can't be predicted, and exists great potential safety hazard; 2, can not detect in the working state of safety check unfailing performance the Slow Close control system.Both there had been potential safety hazard in the Slow Close control system; can not detect the safety check of its reliability again; the role who serves as safety protection in pipe network system is extremely dangerous, and a lot of users' the safety check or the fact that pipe network breaks because of water hammer have just in time illustrated this point.

The purpose of this utility model is to provide a kind of extremely safe reliable Slow Close control system at above-mentioned deficiency, it has the observability of Slow Close piston position, the observability of Slow Close process, safety check descends the Slow Close system whether to be in the detectability at any time of safe and reliable state in working order, and the controllability of Slow Close time, damper piston position.

Technical solution of the present utility model is: the utility model comprises control gear, with with the joining with it buffering hydraulic cylinder of high pressure hose, be connected with safety detection device on control gear, floating on the piston of buffering hydraulic cylinder is connected with piston position sensor.

Said piston position sensor is a sensing shaft in the technique scheme, one end of sensing shaft penetrates oil hydraulic cylinder from cylinder cap, and float with piston and to connect, contact with the cylinder cap sealing, the part of sensing shaft outside the buffering hydraulic cylinder lid, its end has adjusting nut, in order to the initial position of regulating piston in buffering hydraulic cylinder.

Said control gear is to be connected by following structure member to form in the technique scheme: the pipeline before the safety check, Twoway valves, four-way, variable restrictor device, controller pipeline successively connect; Controller is a two-position three way control valve, and a road of the A chamber of control valve connects the variable restrictor device, and the high pressure hose of leading up in B chamber connects with the cylinder cap of buffering hydraulic cylinder, and another road connects the time controlling mechanism, and the time controlling mechanism is a variable restrictor device, the logical atmosphere of outlet; One two other interface of four-way connects pressure gauge, and interface connects the epicoele of the driving small cylinder of controller by threeway one tunnel, and another road meets feeler mechanism, and feeler mechanism is a Twoway valves, and the other end leads to atmosphere, is normally off when not working.

Said two-position three way control valve comprises single small cylinder and the black box that is contained in the piston rod end of small piston in the technique scheme, black box constitutes step type cylinder or conical Sealing by the fastening piece and the sealing gasket of scyewed joint on small piston rod, thereby alternately seals two controls mouthful realization A chamber and the isolation in B chamber and the break-make of three paths by the upper and lower motion of small piston.

Said control gear also can form by connecting with lower member in the technique scheme: pipeline, Twoway valves, time controlling mechanism, four-way pipeline before the safety check connect successively, other three interfaces of four-way are leaded up to high pressure hose and are connected with the cylinder cap of oil hydraulic cylinder, one the tunnel connects pressure gauge, one the tunnel meets feeler mechanism, feeler mechanism is a Twoway valves, be in normally off when not working, the other end leads to atmosphere.

Owing to adopted technique scheme, this control system has reliable in action when work, there are not bump, vibration and noise during closure of check ring, can avoid the generation of water hammer or water hammer pressure is controlled in the extremely low scope, and the Slow Close process can be observed, and the Security of system, reliability can detect, the reliability height of system, safety check is transformed very convenient, manipulates advantages such as very simple.

Shown in Figure 1 is the utility model embodiment 1 theory structure sketch;

Fig. 2 is the black box and the control junction enlarged image of controller;

Fig. 3 connects enlarged view between sensing shaft and the big piston in the sensor;

Fig. 4 is embodiment's 2 principle assumption diagrams.

The utility model is described in further detail below in conjunction with accompanying drawing:

As shown in Figure 1, pipeline before one end of Twoway valves 2 and the safety check 1 connects, the other end connects with four-way 3, second interface of four-way 3 connects pressure gauge 4, the 3rd interface connects with connecting tube 5, the 4th interface connects with variable restrictor device 6, variable restrictor device 6 connects with the A chamber of controller 7, the other end of connecting tube 5 connects with threeway 8, the epicoele of the driving small cylinder 10 of second Interface and Controler 7 of threeway 8 connects, and the 3rd interface connects with feeler mechanism 9, and this mechanism is a Twoway valves, the other end leads to atmosphere, is in closed condition when not working.The end of small piston 11 piston rods is associated with step type cylinder or conical black box 14, small piston 11 is by the pressure medium-driven of epicoele, rely on spring 12 to reset, alternately seal control mouth 13 and control mouth 15, high pressure hose 16 1 ends connect with the B chamber of controller 7.The other end connects with the cylinder cap 18 of buffering hydraulic cylinder 17, and sensor 19 is a class formation, or claims to pierce into sensing shaft from cylinder cap 18, and floating with big piston 20 connects, and with moving of big piston 20, sensor 19 contacts with sealing between the cylinder cap 18 greatly.The other end of sensor 19 is a worm structure, and the adjusting nut 21 of can regulate damper piston 20 positions is housed on it, and this nut constitutes the buffer position controlling mechanism jointly with the exterior edge face of big cylinder cap 18, with the initial buffer position of the valve plate 23 of control safety check 1.Buffer time, controlling mechanism 22 was variable restrictor devices, one end connects with controller 7, and the other end leads to atmosphere, and the structure of black box 14,

control mouth

13,15 as shown in Figure 2, fastening piece 24 and small piston 11 scyewed joint constitute black box 14 jointly with it in fixing seal pad 25.Sensor 19, adjusting nut 21, big cylinder cap 18, big piston 20 structural drawing are as shown in Figure 3, big cylinder cap 18 has a boss that protrudes in the oil hydraulic cylinder 17, also can be to evagination, seal ring, sensor 19 is housed in the boss to be connected with big piston 20 by joining plate 26 and retaining ring 27 and screw, axially and footpath and all leave certain clearance, make sensing shaft be in quick condition between sensing shaft and the joining plate.

Working principle.The closed condition that shown in Figure 1 is when safety check 1 do not work, the control mouth 13 of controller 7 is closed.After the pump motor start, the valve plate 23 of safety check is opened, from the pressure medium one tunnel before the valve through Twoway valves 2, four-way 3, connecting tube 5, threeway 8 enters in the driving small cylinder 10 of controller 7, the elastic force that promotion small piston 11 overcomes spring 12 moves down (cavity of resorption of small piston leads to atmosphere), make the black box 14 on the small piston rod break away from control mouth 13, closing control mouth 15.Simultaneously, another road pressure medium enters the A chamber of controller through variable restrictor device 6, and through controlling mouth 13, B chamber, connecting tube 16, cylinder cap 18, entering (the right chamber of damper piston leads to atmosphere) in the buffering hydraulic cylinder 17, promoting damper piston 20 moves right, driving damper piston position transducer 19 simultaneously moves right together, till position regulation nut 21 leans on upper cylinder cover 18, the buffer position that piston arrives is set (among the figure shown in the dotted line), this position is regulated by adjusting nut 21, buffering preparatory work when so far, the Slow Close control system has been finished closure of check ring.After the pump motor sudden power, upstream pressure p1 reduces suddenly, and medium generation refluence impact valve plate closes for 23 times and contacts with damper piston 20 in the pipe network, promotes damper piston 20 to left movement, buffering hydraulic cylinder 17 interior media is passed through high pressure hose 16 outwards drain.Another process shorter than this process time is: because the pressure in the small cylinder 10 also reduces suddenly simultaneously, small piston 11 moves up under the elastic force effect of spring 12, driving black box 14 moves up, closing control mouth 13, open control mouth 15, so enter atmosphere from the medium in the buffering hydraulic cylinder 17 through high pressure hose 16, control mouth 15, Slow Close time controlling mechanism 22, finish the Slow Close process of safety check.The length of Slow Close time is regulated by Slow Close time controlling mechanism 22.

If medium does not allow to enter atmosphere, then can drain in the inlet tube of pump by connecting tube.

The Safety performance of safety check detects: when safety check 1 is in running order; control mouth 13 is to be in opening state; control mouthfuls 15 is in closed condition, does not have external leakage, and the end face of buffer position adjusting nut 21 is that the exterior edge face with cylinder cap 18 is close to; can judge in view of the above whether damper piston is in the buffering ready position of setting; being, is safe during closure of check ring then, otherwise; be unsafe during closure of check ring, answer the hard stop maintenance.Near the valve of other should closing before shutting down.

The reliability of Slow Close system detects, work shape at safety check, damper piston 20 also under the situation of the position of setting, is opened Safety performance feeler mechanism 9, and the epicoele of small piston 11 is by pressure release, small piston 11 under the elastic force effect of spring 12 will on move, control mouth 13 will be closed, and control mouth 15 is unlocked, so the left chamber of damper piston 20 is by pressure release, the pressure medium that acts on the piston rod of damper piston 20 will promote piston to left movement, until piston 20 by till the boss of upper cylinder cover 18; Closed safe Performance Detection mechanism 9, damper piston 20 should move right, till arriving the buffering ready position of setting.If this process can realize that then the Slow Close control system is reliable.Otherwise, should stop maintenance immediately.

Fig. 4 is the theory structure sketch of this programme embodiment 2 control gear, and it comprises Twoway valves 2, four-way 3, pressure gauge 4, feeler mechanism 9, time controlling mechanism 6, high pressure hose 16 and connecting pipe.Twoway valves 2 is in normally open, and time controlling mechanism 6 is a variable restrictor device, and feeler mechanism 9 is a Twoway valves, is in normal off status when not detecting, and the other end leads to atmosphere.Its connecting relation is pipeline, Twoway valves 2, time controlling mechanism 6, the four-way 3 pipeline connection successively before the safety check 1, other three interfaces of four-way 3 are leaded up to high pressure hose 16 and are connected with the cylinder cap 18 of oil hydraulic cylinder 17, one the tunnel meets feeler mechanism 9, and the other end of feeler mechanism 9 leads to atmosphere.Working principle: after the pump motor start, enter oil hydraulic cylinder 17 from pipe network internal pressure medium through Twoway valves 2, flow controller 6, high pressure hose 16, promote piston 20 and enter the buffering ready position, valve plate 23 was closed when pump motor had a power failure, promote piston 20 to left movement, medium enters in the safety check valve preceding pipeline by high pressure hose 16, four-way 3, flow controller 6, Twoway valves 2 in the cylinder.The time that valve plate closes for 23 times is regulated by flow controller 6.Open feeler mechanism 9, oil hydraulic cylinder 17 left chambeies by pressure release, piston 20 is moved to the left, and medium enters atmosphere, closes feeler mechanism 9, oil hydraulic cylinder 17 left chamber pressurisings, and piston 20 arrives the buffering ready position to the right, detects thereby whole buffer control system is carried out Security.

Claims

1, a kind of novel safety check Slow Close control system, comprise control gear and buffering oil hydraulic cylinder (17), use high pressure hose (16) to connect between the two, it is characterized in that being connected with on the control gear safety detection device (9), the piston (20) of buffering hydraulic cylinder (17) is gone up to float and is connected with piston position sensor (19).

2, a kind of novel safety check Slow Close control system as claimed in claim 1, it is characterized in that said piston position sensor (19) is a sensing shaft, one end of sensing shaft penetrates buffering hydraulic cylinder (17) from cylinder cap (18), and float with piston (20) and to connect, contact with cylinder cap (18) sealing, the part of sensing shaft outside cylinder cap (18), its end has adjusting nut (21).

3, a kind of novel safety check Slow Close control system as claimed in claim 1 is characterized in that said control gear is to be connected by the preceding pipeline of safety check (1), Twoway valves (2), four-way (3), variable restrictor device (6) and controller (7) pipeline successively; Controller (7) is a two-position three way control valve, control valve has three paths, a road of A chamber connects variable restrictor device (6), the high pressure hose (16) of leading up in B chamber connects with the cylinder cap (18) of oil hydraulic cylinder (17), another road connects time controlling mechanism (22), time controlling mechanism (22) is a variable restrictor device, the logical atmosphere of outlet; One two other interface of four-way (3) connects pressure gauge (4), interface connects the epicoele of the driving small cylinder (10) of controller (7) by threeway (8) a tunnel, and another road meets feeler mechanism (9), and feeler mechanism (9) is a Twoway valves, be normally off when not working, the other end leads to atmosphere.

4, as claim 1 or 3 described a kind of novel safety check Slow Close control system, it is characterized in that said two-position three way control valve comprises single small cylinder (10) and is contained in the black box (14) of the piston rod end of small piston (11), black box (14) constitutes step type cylinder or conical Sealing (14), control A chamber and the isolation in B chamber and the break-make of three paths by the fastening piece (24) and the sealing gasket (25) of scyewed joint on small piston rod.

5, a kind of novel safety check Slow Close control system as claimed in claim 1 or 2, it is characterized in that said control gear is connected by the preceding pipeline of safety check (1), Twoway valves (2), time controlling mechanism (6), four-way (3) pipeline successively, other three interfaces of four-way (3) are leaded up to high pressure hose (16) and are connected with the cylinder cap (18) of oil hydraulic cylinder (17), one the tunnel connects pressure gauge (4), one the tunnel meets feeler mechanism (9), feeler mechanism (9) is a Twoway valves, and the other end leads to atmosphere.