CN2166282Y - Return control valve - Google Patents

Abstract

The utility model relates to a water return control valve, which is mainly suitable for the control of circulating systems which can be opened or closed by utilizing fluid medium energy. An upright chamber of a valve body of the control valve is divided into an upper and a lower valve chambers by a baffle plate and is provided with a set of linking piston valve composed of an upper and a lower pistons and a connecting rod. The utility model is characterized in that the lower piston of the valve is assembled on a movable valve seat which can move along the upright chamber of the valve body; a return spring is arranged between the valve seat and the baffle plate; a fluid hole is processed on the baffle plate. The control valve has the advantages of simple structure and safety performance, and fundamentally solves the water return water hammer problem of the existing control valve.

Description

Return control valve

The utility model relates to a kind of fluid system network that places and does not hold, utilize working pump to open, stop caused system change, reach the backwater control valve of automatic control system fluid motion, this control valve comprises valve and opens and closes control mechanism two-part and form, is particularly suitable for controlling normal-pressure hot-water boiler heating circulation system water return pipeline.

Normal-pressure hot-water boiler is one of current civil heating visual plant, this boiler and bearing boiler are relatively, difference not only is confined to the boiler manufacturing and the usability aspect is different between the two, and both are having the internal difference what is more important aspect the heating circulation system control technique.In other words, adopting the key of normal-pressure hot-water boiler heating is how to resolve hot water cyclesystem control problem.

In the bearing boiler circulatory system, comprise boiler body and heating network being one totally-enclosed up circulating water circulating along with starting or stoping of working pump or transfixion down to operational system that there is not termination of pumping circulating water overflow problem in whole heating system.The normal-pressure boiler circulatory system is then different, because of its boiler body is provided with normal battle, no matter belongs to normal or improper (as unexpected power failure) termination of pumping, all causes network circulating water to overflow from the normal pressure point of boiler body easily, causes network to find time.Therefore, for preventing normal-pressure boiler system generation backwater overflow problem, must the backwater control valve be set at the not end of heating network.

The technological means that solves normal-pressure hot-water boiler circulatory system control employing at present is broadly divided into two kinds.The first adopts and controls manually, and shortcoming is fireman's programmed sequence of operations complexity, and mental burden is heavy, and valve event is bigger time lag, can not in time open or close valve at pump startup or turn-off transient (generally in 10 seconds).It two is to adopt the self-acting valve control that links, both the moving control mechanism of the one sleeving valve couplet on the door was not set between the end valve door at pump discharge end and network, " automatic interlock hydraulic control valve " as the CN88220705 patent disclosure, and " fluid level control device " of CN912013379.7 patent disclosure, all belong to interstage valve technology category.Above-mentioned valve mainly has following problem:

One, in the above-mentioned prior art, because the design of interlock control mechanism has problem, valve is relatively poor with pump keying reliability.Particularly above-mentioned " automatic interlock hydraulic control valve ", valve adopt gate valve structure, not only sealing difficulty, and also water hammer is comparatively serious during throttle down.

Two, above-mentioned valve is subjected to service condition restriction bigger, the heating of under landform or floor just differ occasion, networking, and the supporting interstage valve of selecting to be fit to has certain difficulty.

Three, above-mentioned interstage valve complex structure, the manufacture cost height.In above-mentioned " fluid level control device ", when the fluid control hole is blocked by impurity, valve both can't proper functioning.

The purpose of this utility model all is to overcome the deficiency of above-mentioned prior art and provides a kind of grid that is installed in not hold, control fluid circuit backwater control valve.The system fluid variation in pressure that pump or termination of pumping cause is opened in this valve utilization, and piston makes it drive control valve in the action link gear, in time opens or close water return pipeline with the pump start and stop.

The utility model structure comprises that valve body and coupled piston valve thereof constitute.Be not difficult to find out that from the foregoing invention purpose this control valve working principle is to utilize change in fluid pressure to handle the interlock control mechanism, and reaches the purpose of synchronization control valve keying by this mechanism.The valve body of above-mentioned valve is similar to the three-way valve valve body, and the coupled piston valve that a cover is made up of upper piston, lower piston and piston brace rod is housed in the perpendicular chamber of this valve body.Upper and lower piston is assemblied in the upper and lower valve pocket in perpendicular chamber.Wherein lower piston is assemblied on the lower value seat of the perpendicular chamber of valve body, is used for control and locking system water return pipeline.Upper piston is assemblied in the perpendicular chamber, valve body top, is provided with dividing plate between the upper and lower piston in perpendicular chamber, with the perpendicular chamber of valve body separated into two parts.Be provided with intake pipe between the upper piston in the perpendicular chamber of above-mentioned valve body and the nose end lid, directly be connected with the pump housing.Linking mechanism is formed in upper piston and connecting rod thereof and water inlet.This control valve structural feature is that said lower piston valve seat is a movable valve seat that can move along the perpendicular chamber of valve body, and the valve seat return spring is housed between this valve seat and the aforementioned barriers.Aforementioned barriers is processed with fluid through-hole, communicates with valve outlet.The utility model possesses following technical feature: when starting mode of pump, segment fluid flow enters valve body upper piston epicoele by intake pipe, the upper piston that promotes in the linking mechanism moves with lower piston, and lower piston leaves movable valve seat and opens fluid water return pipeline whole circulation system and begin normal circulation.When water pump stopped, pressure disappeared in the upper piston epicoele of linking mechanism, and lower piston is closed under the pressure of return water effect automatically, and when lower piston contacts instantaneously with active base, valve seat is mobile backward with lower piston.Employing activity valve seat can fundamentally solve insoluble in the past backwater water attack problem, and when system on chip during in static state, movable valve seat is under its return spring effect, and self-return also still can keep its excellent sealing performance.

The utility model will adopt simple technological means, and the fixed valve base that the past is traditional becomes the moveable valve seat, solve a normal-pressure hot-water boiler circulatory system backwater water attack problem well.Above-mentioned backwater control valve can be used among medicine, chemical industry, oil and the water-supply systems fully.This control valve has characteristics such as performance safety, reliable, no water attack, has prolonged control valve and network working life.

Following conjunction with figs. is further introduced the utility model structural feature and application example thereof.

Fig. 1 is the utility model embodiment symplex structure partial cutaway diagrammatic sketch.

As can be seen from Figure, the perpendicular chamber 13 of valve body 5 is separated by dividing plate 15, and a cover upper piston 7 and lower piston 14 is housed, and the coupled piston valve of connecting rod 12 compositions.Wherein lower piston 14 is assembled into one with movable valve seat 3 sealings, and return spring 4 is sleeved on connecting rod 12 bottoms, between the intermediate clapboard 6 in movable valve seat 3 and perpendicular chamber 13.Lower piston 14 and movable valve seat 3 sealing assemblings are used to control water return pipeline 16 and open or close.Excessive for preventing that movable valve seat 3 from moving, it is in perpendicular lower end, chamber, and a limited ring 1 can be assembled in movable valve seat 3 front portions, and seal ring 2 can be assemblied between lower piston 14 and perpendicular chamber 13 and lower piston 14 and limited ring 1 surface of contact, prevents that control valve from leaking.

When this control valve is used for lower building normal pressure heating circulation system,, can with bolt 11 spring 10 be assemblied in above the end cap 9 on connecting rod 12 tops for guaranteeing that lower piston 14 has good sealing property.

Among Fig. 1, intake pipe 8 is used for connecting the upper piston top in the pump housing (figure do not draw in) and valve body 15 perpendicular chambeies 13, and when water pump was started working, water entered in the perpendicular chamber 13 through the water inlet pipe, the promotion upper piston moves down, and drives lower piston 14 by connecting rod 12 and opens water return pipeline 16.Switch off the pump, lower piston 14 is under the pressure of return water effect, close water return pipeline 16, movable this moment valve seat 3 moves after together in company with lower piston 14, overcome the water attack that backwater produces, behind system quiescence, movable valve seat 3 is self-return under return spring 4 effect, aforementioned barriers the fluid bore 6 on 15 be used to guarantee upper piston 7 proper functioning.Fluid bore 6 also can be processed in the middle of connecting rod 12, can guarantee the upper piston proper functioning equally.

Claims (4)

1, a kind of fluid system network that places is not held, be used to control fluid circuit backwater control valve, comprise valve body [5] and coupled piston valve [7 thereof, 12,14], wherein the coupled piston valve is by the upper piston [7] that is assemblied in the perpendicular chamber [13] of valve body, lower piston [14] and connecting rod [12] thereof are formed, on, lower piston valve body dividing plate [15] will erect chamber [13] and be divided into, the lower piston chamber, lower piston [14] is enclosed on perpendicular chamber [13] lower valve seat [3] of valve body, intake pipe [8] is arranged between the upper piston [7] and end cap [9] of perpendicular chamber [13], and this control valve feature is that said lower piston [14] is assemblied on the movable valve seat [3] that can move along the perpendicular chamber [13] of valve body [5], between this valve seat [3] and the aforementioned barriers [15] valve seat position spring [4] is housed, be processed with fluid bore [6] on the dividing plate [15].

2, backwater control valve according to claim 1 is characterized in that the front portion that said valve body erects lower end, chamber ［ 13 ］, movable valve seat piston is equipped with a fixed limit ring ［ 1 ］.

3,, be characterized in being provided with seal ring ［ 2 ］ between said lower piston ［ 14 ］ and valve body chamber ［ 13 ］, limited ring ［ 1 ］ surface of contact according to claim 1 or 2 described backwater control valves.

4, backwater control valve according to claim 1 and 2 is characterized in that said spring ［ 10 ］ is fixed on the perpendicular chamber of valve body with on the top end cap ［ 18 ］ by bolt ［ 17 ］.

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