CN2166311Y

CN2166311Y - Water return control valve for ordinary pressure boiler

Info

Publication number: CN2166311Y
Application number: CN 93223513
Authority: CN
Inventors: 肖永海
Original assignee: Individual
Current assignee: Individual
Priority date: 1993-09-03
Filing date: 1993-09-03
Publication date: 1994-05-25
Anticipated expiration: 2003-09-03

Abstract

The utility model relates to a novel water return control valve for atmospheric boilers. A tube switching joint 23 is arranged on a valve cap 3, the inner cavity of an upper valve body 21 is divided into an upper cavity 22 and a cushioning cavity 19 by a cushioning wall 6, an upper piston 5 arranged in the upper cavity 22 is fixed on a valve rod 4, a loop 10 is arranged in the cushioning cavity 19, a loop stop collar 17 is arranged at a butt joint part of the upper valve body 21 and a lower valve body 13, a lower piston 15 fixed at the lower end of the valve rod 4 is arranged under the loop 10, the lower piston 15 blocks a loop hole and drives the loop 10 to upward move, and a cushioning spring 9 is arranged between the loop 10 and the cushioning wall 6. The utility model has the characteristics of sensitive and rapid opening, cushioning damping closing, simple structure, low cost, etc. The utility model solves serious problems of water return and water hammer.

Description

Water return control valve for ordinary pressure boiler

The utility model belongs to valve technology field, relates in particular to a kind of novel normal-pressure boiler backwater control valve.

Normal-pressure hot-water boiler is generalizable with its good safety, economy and long service life, its circulatory system is different from bearing boiler, adopt " descending going up given " method of operation, and boiler body is provided with normal battle, therefore must the backwater control valve be set at water return pipeline.But the backwater control valve that in the past used in the normal-pressure hot-water boiler system all is a hand; normal or improper when out of service at water pump; often owing to failing in time to close the backwater control valve system's backwater is poured in down a chimney, recirculated water overflows from boiler body, causes network system stream empty.For addressing this problem, 88220705.9 number Chinese utility application proposes a kind of automatic interlock hydraulic control valve, the blanked-off pipe joint that is located at the cylinder body upper and lower end of control valve is connected with the pump discharge pipeline with water return pipeline respectively with the tube used for bottom pouring joint, fluid pressure differential when pump is opened, cuts off the water in utilization changes, and driven plunger drives gate valve and in time opens or close water return pipeline.Though systemic circulation water poured in down a chimney the generation of overflowing existing picture when this valve had prevented termination of pumping effectively, because its gate valve structure characteristics determined can produce serious water attack picture now suddenly in its system in a flash that closes, its rationale is the mechanics formula of mv=Fl.Under the floor condition with higher, this water attack makes the violent chatter of system pipeline, even can cause radiator to break, and causes serious consequence.No. 91201339.7 Chinese utility application had proposed a kind of fluid level control device of being made up of liquid level regulating and controlling mechanism and interstage valve afterwards, seal the upper and lower passage of valve body respectively by the piston valve that upper and lower piston and connecting rod thereof are formed, upper piston or connecting rod are provided with the fluid control hole, fluid can enter the top valve pocket through this hole, valve body end cap is provided with fluid bore, be used to install tube connector, so that interstage valve and level controling mechanism are linked.This device attempt is by being provided with suitable control hole quantity and flow area thereof, control lower piston valve time-delay closing, avoid the water attack generation of picture now, but the interstage valve of this device is when approaching closing, below lower piston, can form vacuum rapidly, pull at lower piston, make passage closed suddenly, thus this in a flash system still can produce strong backwater water attack.In addition, when this control device adopts the regulating and controlling mechanism of ball-cock assembly, because the reaction of water level is slower, when the open amount of ball-cock assembly is less than or equal to the amount of releasing of upper piston control hole, upper and lower piston does not move, and the interstage valve opening time is lagged behind, and causes network system pressure excessive.Moreover the switching situation of this valve is not directly perceived, and the boiler attendance workman is difficult to directly judge the working condition of interstage valve.

The purpose of this utility model will overcome the deficiency of above-mentioned prior art exactly, and a kind of novel normal-pressure hot-water boiler backwater control valve is provided.This valve can be automatically along with the start and stop of water pump be in time opened or are closed, and system does not produce the water attack chatter.

For realizing the purpose of this utility model, on this normal-pressure boiler backwater control valve, following two

valve bodies

21 and 13 are docking together, inlet 12 is located at down on the valve body 13, outlet 20 is positioned at the middle part of upper valve body 21, the valve gap 3 at upper valve body 21 tops is provided with tube used for bottom pouring joint 23, it is characterized in that the buffer wall 6 in the upper valve body 21 is divided into epicoele 22 and cushion chamber 19 with the inner chamber of upper valve body 21, valve rod 4 passes from the centre bore of buffer wall 6, the upper end has sufficient length to stretch out from the centre bore of valve gap 3, upper piston 5 is positioned at epicoele 22, be fixed on the valve rod 4, be provided with kink 10 in the cushion chamber 19,

valve body

21 and 13 joint are provided with kink spacing ring 17 up and down, and the lower piston 15 that is fixed on valve rod 4 lower ends is positioned at the below of kink 10, can block the kink hole and drive kink 10 up, between kink 10 and buffer wall 6, be provided with buffer spring 9.

For realizing the purpose of this utility model better, can between the upper end of the valve rod 4 of this normal-pressure boiler backwater control valve and valve gap 3, preloading spring 2 be set, so that the occasion in that system is used for lower building when water pump is out of service, can make control valve in time close by means of the pretightning force of spring.

For realizing the purpose of this utility model better, some cushion holes 7 can be set on the buffer wall 6 of this normal-pressure boiler backwater control valve.

For realizing the purpose of this utility model better, the lower piston 15 and the kink 10 of this normal-pressure boiler backwater control valve are taper fit.

Normal-pressure hot-water boiler backwater control valve of the present utility model have open sensitive rapidly, close buffering damping, simple in structure, characteristics such as cost is lower, both can be used for lower building, also can be used for skyscraper, the real problem of system's generation backwater water attack that fundamentally thoroughly solved, safe and reliable, and the duty of control valve itself is simple and clear, is convenient to the boiler attendance workman and observes grasp.

Fig. 1 is the schematic diagram of the utility model embodiment.

Describe embodiment of the present utility model in detail below in conjunction with accompanying drawing.

Upper and

lower valve body

21 and 13 is ironcasting, is docking together by bolt 18.The outlet 20 of valve is located at the middle part of upper valve body 21, receives boiler body (not drawing among the figure) by pipeline in system.The inlet 12 of valve is located at down on the valve body 13, join with water return pipeline in system (not drawing among the figure).On the valve gap 3 at upper valve body 21 tops, except that centre bore, also be provided with tube used for bottom pouring joint 23, in system, receive between exit of pump and the non-return valve and (do not draw among the figure) by pipeline.Top in upper valve body 21 is provided with buffer wall 6 near the exit, and the inner chamber of upper valve body is divided into epicoele 22 and cushion chamber 19.On buffer wall 6, except that centre bore, also be provided with some cushion holes 7.Valve rod 4 passes from the centre bore of buffer wall 6, and its upper end has sufficient length to stretch out from the centre bore of valve gap 3.The preloading spring 2 that the nut 1 of valve rod 4 upper ends will be enclosed within on the valve rod is pressed on the valve gap 3.In epicoele 22, upper piston 5 is fixed on the valve rod 4, can move up and down in epicoele.Below cushion chamber 19 inner outlets 20, be provided with kink 10, can in the cushion chamber of outlet below 20, move up and down.The centre of kink 10 is up-thin-low-thick bellmouth.In order to strengthen the sealing effectiveness of kink 10 and valve interior wall, on kink 10, be provided with two O-ring seals 11.Be arranged on the up and down kink spacing ring 17 of

valve body

21 and 13 joints, in order to the fixing lower dead center of kink 10 strokes.Lower piston 15 is positioned at the below of kink 10, is fixed on the lower end of valve rod 4 with nut 14, and is same, in order to improve sealing effectiveness, is provided with the corresponding cone rubber sealing ring 16 of its diameter and kink aperture at its position that cooperates with kink 10.Between kink 10 and buffer wall 6, be provided with buffer spring 9.

When starting water pump to system water supply, the pressure of exit of pump is when backing down non-return valve, some delivers to the epicoele 22 of backwater control valve by tube used for bottom pouring joint 23, force upper piston 5 and valve rod 4 descending, water below the upper piston 5 flow into cushion chambers 19 by cushion hole 7, and lower piston 15 and kink 10 are also descending thereupon under the pressure of the drive of valve rod 4 and buffering spring 9 respectively.Kink 10 walk to spacing ring 17 be obstructed stop after, lower piston 15 continues descending under the promotion of upper piston 5 and valve rod 4, throws off with kink 10, thereby the backwater control valve is opened, system begins normal circulation.When water pump is out of service, pressure in the epicoele 22 is tending towards reducing, lower piston 15 is about to the kink hole under pressure of return water and is blocked, and drive that it is up together, water in the cushion chamber 19 flows into epicoele 22 along with the up of upper piston 5, the impulse force of system's backwater is cushioned gradually and weakens under the damping action of buffer spring 9 like this, until disappearance, thus the water attack generation of picture now when having avoided the backwater control valve to close.In addition, the boiler attendance workman can judge the keying state of backwater control valve according to the length variations that stretch out from valve gap the valve rod upper end.

Except that the normal-pressure hot-water boiler system, the utility model also can be used for other fluid feed system.Though in the utility model specification and accompanying drawing, describe and shown the detail of relevant embodiment, it should be explicitly made clear at this point that under the situation of the purport of the utility model claim and scope, its concrete structure can change.

Claims

1, a kind of normal-pressure boiler backwater control valve, on having, following two valve bodies 21 and 13 are docking together, inlet 12 is located at down on the valve body 13, outlet 20 is positioned at the middle part of upper valve body 21, the valve gap 3 at upper valve body 21 tops is provided with tube used for bottom pouring joint 23, it is characterized in that the buffer wall 6 in the upper valve body 21 is divided into epicoele 22 and cushion chamber 19 with the inner chamber of upper valve body 21, valve rod 4 passes from the centre bore of buffer wall 6, the upper end has sufficient length to stretch out from the centre bore of valve gap 3, upper piston 5 is positioned at epicoele 22, be fixed on the valve rod 4, be provided with kink 10 in the cushion chamber 19, valve body 21 and 13 joint are provided with kink spacing ring 17 up and down, and the lower piston 15 that is fixed on valve rod 4 lower ends is positioned at the below of kink 10, can block the kink hole and drive kink 10 up, between kink 10 and buffer wall 6, be provided with buffer spring 9.

2,, it is characterized in that being provided with preloading spring 2 between the upper end of valve rod 4 and the valve gap 3 according to the described normal-pressure boiler backwater of claim 1 control valve.

3,, it is characterized in that buffer wall 6 is provided with some cushion holes 7 according to the described normal-pressure boiler backwater of claim 1 control valve.

4,, it is characterized in that lower piston 15 and kink 10 are taper fit according to the described normal-pressure boiler backwater of claim 1 control valve.