CN2099249U - Liquid level control device - Google Patents

Abstract

The utility model relates to a liquid level control device which is arranged in the tail end pipeline of a system network, comprising a liquid level control mechanism and a linking valve. The liquid level control device is characterized in that piston valves composed of upper and lower pistons and a connecting rod are respectively sealed upper and lower passages on valve bodies; fluid control holes are arranged on the upper piston or the connecting rod; fluid can enter an upper valve cavity via the holes; the end housings of the valve bodies are provided with fluid holes for installing connecting pipes, which is convenient to connect the linking valve and the level control mechanism into integration. The liquid level control device has the advantages of simple structure, reliable performance, etc. The liquid level control device is especially suitable for controlling the circulating system of an ambient pressure boiler, and preventing systematic water from flowing back and generating water hammer when a pump is stopped.

Description

Liquid level control device

The utility model relates to a kind of fluid system networking end that places, utilize working barrel to open, stop caused system change, reach the fluid level control device of automatic control system fluid shuttling movement, this device comprises valve and opens and closes regulating and controlling mechanism two parts and forms, and is particularly suitable for control and " gives " the normal-pressure hot-water boiler heating circulation system under up.

Normal-pressure hot-water boiler has become one of world today's civil heating visual plant, and it has won society with its security, economy and long service life and the user generally praises.As everyone knows, normal-pressure boiler is compared with bearing boiler, between the two difference be not limited only to the boiler manufacturing and aspect of performance different, there is essential distinction both heating circulation system control technology aspects of what is more important.In other words, adopting the key of normal-pressure hot-water boiler heating is to resolve hot water cyclesystem control problem.Because in the bearing boiler circulatory system, comprise in boiler body and the heating network it being totally-enclosed " giving under a up " operational system, recirculated water circulates along with starting or stoping of working barrel or transfixion, and whole heating system does not exist termination of pumping recirculated water to return to pour in down a chimney problem.But the normal-pressure boiler circulatory system is then different; because of its boiler body is provided with normal battle; no matter belong to normal or improper (as unexpected power failure) termination of pumping causes the network backwater to pour in down a chimney easily, recirculated water is overflowed from the normal pressure point of boiler body, cause network to find time.So with regard to the normal-pressure boiler circulatory system, pour in down a chimney problem, must control valve be set at the head and end of heating network for preventing backwater.

The technological means that present solution normal-pressure hot-water boiler circulatory system control problem is adopted is broadly divided into two kinds, the first is by controlling manually, shortcoming is fireman's operation sequence complexity, mental burden is heavy, and valve event is bigger time lag, (in 10 seconds) in time open or close valve can not or to stop moment at pump startup, run into unexpected power failure and can't in time control especially.It two is the control that links of head and end valve, both between the terminal valve of pump discharge end and networking a cover link gear has been set and has kept first, terminal valve synchronization action.CN88220705 patent disclosed " automatic interlock hydraulic control valve " is an example wherein, obviously, adopts each valve interlock control device in the normal-pressure boiler circulatory system, helps realizing the control of normal-pressure boiler system automation.

In the CN88220705 patent, valve interlock principle is to utilize to open the system fluid pressure differential that pump or termination of pumping cause and change, directly act on the piston in the hydraulic power pack, and, in time open or close water return pipeline with the pump start and stop by the direct gate valve that is arranged in the end of backwater networking that drives of piston.The problem that this interstage valve exists mainly contains:

One, do not open in a flash at working barrel startup, interstage valve, the pump housing and the heating network facilities are all born very big pressure, therefore there are strictness restriction its gate valve opening time, and the overtime unlatching of gate valve damages motor, the pump housing and the heating network facilities easily;

Two, adopt gate valve to do interstage valve, its reliability and sealing are relatively poor, and water hammer is more serious when closing gate valve;

Three, this valve is subjected to service condition restriction bigger, adopts networking heating under landform or floor just differ occasion, and selecting to be fit to desirable supporting interstage valve has certain difficulty;

Four, above-mentioned interstage valve complex structure, the cost cost is higher.

The purpose of this utility model all is to overcome the deficiency of above-mentioned prior art and provides a kind of and be installed among the terminal pipeline of grid, utilize the fluid level control device that water-head changes or the magnetic valve autocontrol valve opens and closes, this device comprises valve and regulates controlling organization two parts and form, not only can be used for the normal-pressure hot-water boiler circulatory system, but also can be used for metallurgy, chemical industry, oil and urban water supply etc. like type systematic.

Be not difficult to find out from the foregoing invention purpose, this fluid level control device operation principle is to utilize liquid level to change to handle regulating and controlling mechanism, and reach the purpose of Synchronization Control valve keying by this mechanism, the utility model must possess following technical characteristic for this reason: when working barrel starts, liquid level changes (decline) thereupon, regulating and controlling mechanism is action thereupon also, utilizes the automatic Open valve of system pressure, makes whole system begin normal circulation; When working barrel stopped, liquid level changed (rising) thereupon, and regulating and controlling mechanism reaches the setting liquid level, utilized the system pressure automatic-closing valve, made whole system stop circulation.

Following conjunction with figs. is introduced this fluid level control device concrete structure characteristics and application example thereof.

Fig. 1 is a valve mechanism schematic diagram in the fluid level control device.

Fig. 2 is that fluid level control device is applied to normal-pressure boiler circulatory system structure principle chart.

Valve mechanism shown in Figure 1 (wherein among the liquid level regulating and controlling mechanism figure draw in the end) is this device important component part.As seen from Figure 1, the valve body 10 of this valve is similar to the triple valve valve body, the piston valve that one cover is made up of upper piston 4, lower piston 13 and piston brace rod 12 is housed in the vertical chamber of valve body 10, wherein lower piston 13 is used for closed valve 10 perpendicular chamber lower flow exit passageways, upper piston 4 is assemblied in the valve body 10 top Vertical Channel, with nut 6,7 upper and lower piston 4,13 and connecting rod 12 is assembled into one.Answer process fluid control hole 11 on above-mentioned piston 4 or the connecting rod 12, this control hole is used to link up piston 4 upper and lower valve pockets, makes among fluid can enter epicoele from cavity of resorption by control hole 11.Upper end, above-mentioned valve body 10 vertical chambeies connects on a valve gap 2, this valve gap with bolt and is processed with fluid bore 5.With communicating pipes 22 connecting fluid bore 5 and the liquid level regulating and controlling mechanism had both constituted this fluid level control device (referring to Fig. 2).

Above-mentioned regulating and controlling mechanism can be made up of container 19 and the ball-cock assembly 18 that is located in this container, also can replace ball-cock assembly 18 by float-controlled valve and form the liquid level regulating and controlling mechanism.It is that the liquid level of using tube connector 22 to connect ball float (float) valves 18 control containers 19 changes that this mechanism mainly acts on, and when ball-cock assembly 18 risings reach a certain liquid level of setting, has both blocked above-mentioned fluid bore 5, utilizes system pressure driven plunger valve to close the fluid flow pass; When volume 19 liquid levels descended, ball-cock assembly 18 was opened fluid bore 5 automatically, and piston 4 upper cavity pressures reduce, and utilize system pressure to order about on the piston valve and move, and lower piston 13 is opened the fluid passage thereupon.Liquid level in the said vesse 19 changes (rise or descend) can directly be controlled by water pump 16 different conditions (starting or stoping), to reach the purpose that Synchronization Control interstage valve 20 opens and closes.This fluid level control device operation principle hereinafter is described in detail.

Except that the mentioned fluid level control device that arrives above, possess good seal performance in order to protect interstage valve 20, between its valve body 10 and valve gap 2 connecting portions seal washer 8 is housed.Upper piston 4 is equipped with leather cup formula sealing ring 9 with valve pocket 3 contacts site, is used to keep good motion sealing property between upper piston 4 and the valve pocket 3.Lower piston 13 is equipped with sealing ring 1 with valve pocket 14 contact positions.Above-mentioned valve pocket can adopt copper or stainless steel to manufacture, and corrodes to prevent the valve pocket position, and improves upper and lower piston kinematic dexterity and reliability.Above-mentioned piston valve movement travel is by valve gap 2 controls.Depart from for preventing that piston valve from moving, lower piston 13 bottom surfaces can be provided with lead 15, and lead 15 is closed in the process of opening at piston valve, do not break away from valve body 10 fluid issuing passages all the time.

This liquid control device also can adopt magnetic valve regulating and controlling mechanism control connection pipe 22 and valve gap fluid bore 5 break-makes except that adopting above-mentioned mechanical type liquid level regulating and controlling mechanism.The magnetic valve working signal can directly utilize water pump 16 to start or stop the manipulation magnetic valve and open or close, and adopts above-mentioned controlling organization more safe and reliable than the mechanical type regulating and controlling mechanism, and highly sensitive, is convenient to control.In addition, can utilize also that water pump 16 opens, the stopping time, the variation of its outlet pressure is converted to signal of telecommunication control magnetic valve with pressure signal and opens and closes.In addition, still can adopt mechanical type to change and do the magnetic valve working signal by container 19 liquid level liftings.Specifically select the sort of liquid level regulating and controlling mechanism for use, can be determined according to field requirement.

Be example with the normal-pressure hot-water boiler circulatory system below, introduce this fluid level control device operation principle.

By as can be seen shown in Figure 2, the horizontal interface of above-mentioned interstage valve 20 docks with terminal pipeline and is assemblied in the heating network 21 terminal pipelines, the fluid issuing connection container 19 of this valve, be provided with ball float 18 in the container 19, utilize the liquid level lifting to change control connection pipe 22 break-makes, and then by-pass valve control 20 is opened or is closed.In the native system, when water pump 16 was in off working state, interstage valve 20 was also both closed; When water pump 16 work and extraction boiler 17 water, also at first begin to descend with the water level in the container 19 that boiler 17 is connected thereupon, ball-cock assembly 18 unlatchings automatically at once this moment, the fluid that is enclosed between tube connector 22 and piston 4 epicoeles is discharged rapidly, piston 4 upper cavity pressures obviously reduce, although fluid still can enter epicoele by cavity of resorption from connecting rod 12 center control holes 11 this moment, but because of its flow limited, piston valve both can move up under the system pressure effect, open the fluid issuing passage, whole system begins normal circulation.When water pump 16 stops, fluid continues to flow into and makes it liquid level among the container 19 and recover original position rapidly, ball-cock assembly 18 is with both closing, and seal tube connector 22 simultaneously, this moment, piston valve began return under the system pressure effect, because the restriction of controlled drilling 11 circulatioies, the piston valve return time also is subjected to corresponding control, therefore can reach the purpose of time-delay control piston valve closing time by regulating control hole 11 quantity and flow area thereof, also solve the water attack problem that the network backwater produces simultaneously.

This fluid level control device not only is confined to the above-mentioned normal-pressure hot-water boiler circulatory system and uses, also applicable to systems such as metallurgy, chemical industry, oil and urban water supplies.This device can be realized and working barrel synchronization action, very favourable to realizing system automation control, and can solve backwater water attack problem simultaneously.This apparatus structure is simple, and cost is low, and makes easily.Its material can be selected according to practical application.This device service behaviour safety, reliable, its reliability index reaches more than 99% after tested.

Claims (6)

1, a kind of fluid system network that places is not held among the pipeline, the fluid level control device that liquid level regulating and controlling mechanism and interstage valve 20 is fused and formed by tube connector 22, be characterized in being equipped with in the triple-valve body 10 vertical chambeies of interstage valve 20 cover by upper piston 4, the piston valve that lower piston 13 and piston brace rod 12 are formed, wherein lower piston 13 closed valves 10 erect chamber lower flow exit passageways, upper piston 4 is assemblied in the passage of perpendicular chamber, valve body 10 tops, upper piston 4 or connecting rod 12 are processed with links up on the piston 4, the fluid control hole 11 of lower valve chamber, valve gap 2 are provided with fluid bore 5 and are fixed by bolts to upper end, valve body 10 perpendicular chamber.

2, fluid level control device according to claim 1 is characterized in that said interstage valve 20 valve bodies 10 upper and lower perpendicular chambeies are equipped with the valve pocket of being made by copper or stainless steel 3,14.

3, fluid level control device according to claim 1 is characterized in that the upper piston 4 of said interstage valve 20 is equipped with leather cup formula sealing ring 9.

4, fluid level control device according to claim 1 is characterized in that lead 15 is equipped with in lower piston 13 bottom surfaces of said interstage valve 20.

5, fluid level control device according to claim 1 is characterized in that said regulating and controlling mechanism is to adopt container 19 and be arranged on ball float (float) valve 18 that joins with tube connector 22 within this container.

6, fluid level control device according to claim 1 is characterized in the magnetic valve that said regulating and controlling mechanism adopts water pump 16 controls and tube connector 22 to join.

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