CN2802220Y

CN2802220Y - Check valve

Info

Publication number: CN2802220Y
Application number: CN 200520034488
Authority: CN
Inventors: 徐建明
Original assignee: Individual
Current assignee: Individual
Priority date: 2005-06-14
Filing date: 2005-06-14
Publication date: 2006-08-02
Anticipated expiration: 2015-06-14

Abstract

The utility model discloses a check valve which comprises a valve body provided with an inlet section and an outlet section, and a movable valve clack which is arranged in the valve body and forms sealing with a port in the inlet section, wherein the movable valve clack is rotatablely connected with the valve body in which a decompression chamber. When the movable valve clack rotates to the targeted position, the decompression chamber and the movable valve clack form sealing. The decompression chamber is communicated with a decompression pipe outside the valve body; the decompression pipe is provided with an automatic valve which is opened or closed according to pressure changes of the inlet section or pressure differences between the inlet section and the outlet section. The utility model has the advantages that because the opening degree of the movable valve clack is big, the movable valve clack is away from a main flow area of a pipeline after opening, in the operational process, under the action of the pressure in the pipeline, the movable valve clack is tightly attached and pressed on a port of the decompression chamber to form sealing, but does not suspends in fluid to be impacted, so that the movable valve clack produces no resistance to the fluid so as to effectively reduce the energy consumption of a pump. The utility model also has the characteristics of stable running, no vibration, no noise and long service life.

Description

Safety check

Technical field

The utility model relates to a kind of valve that is arranged in the fluid delivery pipeline, relates in particular to cutting off the input of pump suddenly and exports the safety check that can prevent fluid generation adverse current under the situation that stops.

Background technique

Safety check is mainly used on the conveyance conduit of flowing mediums such as former water, clear water, circulating water, sewage, is installed in the outlet port of water pump, and its effect is that fluid output prevents when stopping that fluid from producing the persistency adverse current cutting off the input of pump suddenly.At present, the safety check that obtains widespread is structurally more, and what adopt is such mode, a rotating movable flap promptly is set in valve body, this activity flap forms sealing in starting point and valve body entrance inner port, behind the pump startup under the punching press of entrance one side liquid, movable flap rotates up to be opened, fluid enters delivery line by valve body, and when pump unexpected when out of service, the entrance decompression, the inner mouth inner and outer side of entrance differential pressure with effect instantaneous backflow under, movable flap is promptly back into starting point and is recovered sealing with the entrance inner port, prevents that fluid from producing the effect of adverse current thereby play.The defective that this class safety check exists is, after movable flap is pushed open from starting point by fluid, its position can not be fixed, in the pipeline main flow area, be subjected to fluid impact and ceaselessly swing, increased the fluid resistance in the pipeline, the power consumption of pump is increased, pipeline inner pressure is fluctuateed, influence the pipeline traveling comfort; Because it is moving that movable flap does not stop, also cause its bearing pin that is connected with valve body wearing and tearing to increase, make shorten dramatically the working life of safety check.In addition, instantaneous backflow directly acts on the movable flap, produces very big water hammer and cause bigger vibration and noise in pipeline, can form destructive water hammer and damage activity flap assembly and pipeline when serious.

The model utility content

Technical problem to be solved in the utility model provides the safety check that can not produce resistance in a kind of running, and it not only operates steadily, and has long working life.

The technological scheme that its technical problem that solves the utility model adopts is: safety check of the present utility model comprise have entrance, the valve body of outlet section, and be arranged on the movable flap that forms sealing in the valve body with the entrance inner port, this activity flap and valve body are rotatably connected, it is characterized in that: also be provided with pressure-releasing chamber in the described valve body, after movable flap was rotated in place, pressure-releasing chamber and movable flap formed sealing; The outer relief tube of described pressure-releasing chamber and valve body communicates, and this relief tube is provided with the self-acting valve that opens or closes according to the pressure reduction between entrance variation in pressure or entrance, the outlet section.

As improvement of the technical scheme, in the working life for avoiding instantaneous backflow to produce destructive water hammer and further improve safety check, in described entrance, also be provided with Slow Close mechanism.

The beneficial effects of the utility model are, movable flap open degree is big, open the back away from the pipeline main flow area, movable flap is tightly riding on the pressure-releasing chamber port and is forming sealing in the running under the manifold pressure effect, can not be suspended in and impacted by it, thereby can convection cell do not produce resistance, so can reduce the energy consumption of pump effectively, but also have operate steadily, the characteristics of friction, noiseless, long service life.

Description of drawings

This specification comprises following two width of cloth accompanying drawings:

Fig. 1 is the structural representation of the utility model safety check;

Fig. 2 is the partial sectional view of the utility model safety check;

Component, position and numbering among the figure: valve body 10, entrance 11, outlet section 12, movable flap 13, valve gap 20, pressure-releasing chamber 21, pressure release 22, valve 23, solenoid valve 24, pressure transducer 25, Slow Close mechanism 30, pedestal 31, aciculiform hole 32, piston 34, push rod 35, pressure spring 33.

Embodiment

Below in conjunction with drawings and Examples the utility model is further specified.

As shown in Figure 1, safety check of the present utility model comprise have entrance 11, the valve body 10 of outlet section 12, and be arranged on the movable flaps 13 that form sealing in the valve body 10 with entrance 11 inner port, this activity flap 13 is rotatably connected with valve body 10.Also be provided with pressure-releasing chamber 21 in the valve body 10, after movable flap 13 was rotated in place, pressure-releasing chamber 21 formed sealing with movable flap 13; Described pressure-releasing chamber 21 and valve body 10 outer relief tubes 22 communicate, and this relief tube 22 is provided with the self-acting valve 24 that opens or closes according to the pressure reduction between entrance 11 variation in pressure or entrance 11, the outlet section 12.When pump startup, entrance 11 pressure raise, fluid promotion activity flap 13 upwards rotates, entrance 11 inner port are opened, and fluid can pass through smoothly, and self-acting valve 24 is opened simultaneously, relief tube 22 communicates with atmosphere, pressure-releasing chamber 21 pressure releases, under the effect of differential pressure, movable flap 13 is pushed and rotates to pressure-releasing chamber 21 ports and form sealing; When pump is out of service, entrance 11 decompressions, self-acting valve 24 is closed simultaneously, and movable flap 13 self-return under the effect of deadweight and instantaneous backflow is closed, and recovers sealing with inlet 11 inner port, makes the fluid in the pipeline can not produce adverse current.

Described self-acting valve 24 can be taked two kinds of such control modes, and one, adopt solenoid valve, and the pressure transducer 25 that can sense entrance 11 pressure and variation in pressure is set in entrance 11, sensor 25 controls that are stressed of this solenoid valve; Two, between entrance 11, outlet section 12 the pressure reduction induction mechanism is set, self-acting valve 24 is controlled by this pressure reduction induction mechanism.

For ease of assembling and maintenance, and make movable flap 13 have maximum open degree, as shown in Figure 1, be provided with valve gap 20 above valve body 10, pressure-releasing chamber 21 is arranged on this valve gap 20, and the upper end of movable flap 13 is rotatably connected on valve gap 20 by bearing pin.For improving the working life of movable flap 13, movable flap 13 can be made with the nylon rubber material, has good sealing and wear-resisting property.

For the water hammer that instantaneous backflow produced being controlled in the scope that pipeline and safety check can bear, in entrance 11, be provided with Slow Close mechanism 30.Fig. 2 shows a kind of concrete structure of Slow Close mechanism 30, as shown in the drawing, Slow Close mechanism 30 comprises the pedestal 31 that is fixed on entrance 11 inner port places, offer axial aciculiform hole 32 on this pedestal 31, in pedestal 31 inner chambers, also be provided with the piston 34 that has push rod 35, also be provided with pressure spring 33 between the inner port in piston 34 and aciculiform hole 32.When pump startup, fluid enters in the pedestal 31 through axial aciculiform hole 32, promotes piston 34 and moves ahead, and push rod 35 stretches out entrance 11 inner port; And when pump is out of service, movable flap 13 resets downwards, because push rod 35 is in the release location, movable flap 13 can not Close All, fluid in pedestal 31 inner chambers produces damping from 32 extrusion processs of aciculiform hole, make also residue have about 20% unlatching cross section slowly to close, the water hammer that can effectively unexpected termination of pumping be produced is limited within 1.5 times of working pressures.

It is to be noted, above the described principles more of the present utility model that just explain through diagrams, because the those of ordinary skill to constructed field is easy to carry out on this basis some modifications and change, therefore this specification be not be the utility model to be confined to shown in and in described concrete structure and the Applicable scope, so every the corresponding modify and equivalent that might be utilized all belongs to the claim that the utility model is applied for.

Claims

1, a kind of safety check, the valve body (10) that comprises have entrance (11), outlet section (12), and be arranged on the movable flap (13) that forms sealing in the valve body (10) with entrance (11) inner port, this activity flap (13) is rotatably connected with valve body (10), it is characterized in that: also be provided with pressure-releasing chamber (21) in the described valve body (10), after movable flap (13) was rotated in place, pressure-releasing chamber (21) formed sealing with movable flap (13); The outer relief tube (22) of described pressure-releasing chamber (21) and valve body (10) communicates, and this relief tube (22) is provided with the self-acting valve (24) that opens or closes according to the pressure reduction between entrance (11) variation in pressure or entrance (11), the outlet section (12).

2, safety check according to claim 1 is characterized in that: described valve body (10) top is provided with valve gap (20), and pressure-releasing chamber (21) is arranged on this valve gap (20); The upper end of described movable flap (13) is rotatably connected on valve gap (20) by bearing pin.

3, safety check according to claim 1 is characterized in that: described self-acting valve is served as reasons and is arranged on the solenoid valve of pressure transducer (25) control in the entrance (11).

4, safety check according to claim 1 is characterized in that: be provided with Slow Close mechanism (30) in the described entrance (11).

5, safety check according to claim 4, it is characterized in that: described Slow Close mechanism (30) comprises the pedestal (31) that is fixed on entrance (11) inner port place, offer axial aciculiform hole (32) on this pedestal (31), in pedestal (31) inner chamber, also be provided with the piston (34) that has push rod (35), also be provided with pressure spring (33) between piston (34) and aciculiform hole (32) inner port.