CN102022552A

CN102022552A - Bidirectional sealing frictionless butterfly valve

Info

Publication number: CN102022552A
Application number: CN 201010573239
Authority: CN
Inventors: 杨选标; 杨选建; 杨荣水; 杨贤麟; 杨选和
Original assignee: ZHEJIANG PETROCHEMICAL VALVE CO Ltd
Current assignee: ZHEJIANG PETROCHEMICAL VALVE CO Ltd
Priority date: 2010-12-03
Filing date: 2010-12-03
Publication date: 2011-04-20
Anticipated expiration: 2030-12-03
Also published as: CN102022552B

Abstract

The invention relates to a bidirectional sealing frictionless butterfly valve mainly solving the technical problems of leakage, and the like caused by easy elastic deformation of a valve seat because of overlarge medium pressure at the outlet end of a traditional butterfly valve. The bidirectional sealing frictionless butterfly valve is characterized in that a gap is formed between a valve seat and a butterfly board, a bulk cavity is arranged in the valve seat and internally provided with a frame, one end surface of the frame is attached to the valve body, one end surface of the frame, which is attached to the bulk cavity of the valve seat, is provided with a circular groove, an oil hole which penetrates through both ends of the frame and is communicated with the circular groove is arranged on the frame, an oil inlet is arranged on a position of the valve body, which corresponds to the oil hole of the frame, communicated with the oil hole and provided with an oil hole joint, one end of the oil hole joint is fixed with the oil inlet, and the other end of the oil hole joint is communicated with an oil pipe of an oil pump which can pump pressure oil into the bulk cavity of the valve seat so that the valve seat and the butterfly board are attached and sealed. Pressure oil is conveyed into the bulk cavity of the valve seat through the oil pump so that the valve seat and the butterfly board are attached to realize bidirectional sealing.

Description

Two way sealed does not have the friction butterfly valve

Technical field

The present invention relates to a kind of valve, relating to a kind of two way sealed does not in particular have the friction butterfly valve, is mainly used in the pipework field.

Background technique

For resistance to pressure and the stability that guarantees butterfly valve, avoid the excessive compression of valve plate and valve seat, what existing reed valve adopted mostly is two eccentric structures, two eccentric structures are meant that the valve rod axle center both departed from the butterfly plate center, also departed from the valve body center, after valve rod drives butterfly plate and rotarily opens, make butterfly plate can immediately break away from valve seat, significantly eliminated unnecessary excessive compression of butterfly plate and valve seat and scraping phenomenon, the moment of torsion when having alleviated the butterfly valve unlatching, reduced wearing and tearing, improved the valve seat life-span.Though two eccentric structure butterfly valves can be avoided the excessive compression of butterfly plate and valve seat, reduce the operation moment of torsion, but because its cross section of butterfly plate of existing butterfly valve is the trapezoidal cone angle that has mostly, like this when the pressure medium of butterfly valve import one side is excessive, butterfly plate is subjected to the extruding of pressure medium, the butterfly plate sealing surface can be preferably fits with the sealing surface of valve seat, guarantees the sealability of butterfly valve; But when butterfly valve exports the pressure medium of a side when excessive, resiliently deformable easily takes place and causes leakage in valve seat.

Summary of the invention

For the outlet end pressure medium that solves existing butterfly valve when excessive, resiliently deformable easily takes place and causes technical problems such as leakage in valve seat; The invention provides a kind of two way sealed does not have the friction butterfly valve, and this butterfly valve can avoid valve seat generation resiliently deformable also can effectively improve the sealability of butterfly valve when the pressure medium of butterfly valve import or export end is excessive.

For solving above technical problem, the technological scheme that the present invention takes is that a kind of two way sealed does not have the friction butterfly valve, and it includes valve body, butterfly plate and valve rod, and valve seat is installed in valve body, and the butterfly plate in described valve rod passes valve body and places valve body links to each other; It is characterized in that having the gap between the sealing surface of described valve seat and butterfly plate, in described valve seat, be provided with cavity volume, skeleton and skeleton one end face and valve body are installed in this cavity volume to fit, on an end end face of skeleton and the applying of valve seat cavity volume, be provided with circular groove, skeleton is provided with and runs through the oil hole skeleton two ends and that communicate with circular groove, be provided with oil inlet hole on the described valve body with on the corresponding position of skeleton oil hole, this oil inlet hole is connected with oil hole and is provided with oil connection on oil inlet hole, this oil connection one end and oil inlet hole fix, the other end is connected with the oil pipe of oil pump, and oil pump can make the sealing that fits of valve seat and butterfly plate to valve seat cavity volume pump-in pressure oil.

Further, uniformly around the described skeleton be arranged with a plurality of oil holes, each oil hole communicates with the circular groove of skeleton respectively, and is provided with the annular connectivity slot that is communicated with each oil hole on the end face that skeleton and valve body are fitted, and this annular connectivity slot is connected with the oil inlet hole of valve body.

The invention has the beneficial effects as follows by oil pump pressure oil is transported in the cavity volume of valve seat through the oil inlet hole of valve body and the oil hole of skeleton, ordering about the sealing surface of valve seat and the sealing surface of butterfly plate fits, because the pressure of pressure oil is greater than the pressure medium of valve body entrance point and the pressure medium of outlet end, guarantee the two way sealed of valve like this, and when valve opening or when closing, correspondingly close and start oil pump, make that the sealing surface of valve seat is corresponding to be separated with the sealing surface of butterfly plate or fit, realize that frictionless opens and closes valve, reduces the operation moment of torsion of valve when opening and closing.

Description of drawings

Fig. 1 does not have the main TV structure figure of friction butterfly valve for a kind of two way sealed of the embodiment of the invention.

Fig. 2 is A among Fig. 1-A place sectional structure chart.

Fig. 3 analyses and observe local amplification assumption diagram for B-B place among Fig. 1.

Fig. 4 is the main TV structure figure of embodiment of the invention skeleton.

Fig. 5 is the sectional structure chart of embodiment of the invention skeleton.

Embodiment

Below in conjunction with accompanying drawing embodiment of the present invention is described further:

As shown in Figure 1 to Figure 3, the present invention does not have the friction butterfly valve for a kind of two way sealed, and it includes valve body 1, butterfly plate 2 and valve rod 3, and valve seat 4 is installed in valve body 1, and the butterfly plate 2 in described valve rod 3 passes valve body 1 and places valve body 1 links to each other; For outlet end 12 pressure mediums that solve existing butterfly valve when excessive, resiliently deformable easily takes place and causes technical problems such as leakage in valve seat 4, has the gap between the sealing surface of described valve seat 4 and butterfly plate 2, in described valve seat 4, be provided with cavity volume 41, skeleton 5 and skeleton 5 one end faces and valve body 1 are installed in this cavity volume 41 to fit, on the end end face that skeleton 5 and valve seat 4 cavity volumes 41 are fitted, be provided with circular groove 51, skeleton 5 is provided with and runs through oil hole 52 skeleton 5 two ends and that communicate with circular groove 51, be provided with oil inlet hole 13 on the described valve body 1 with on the skeleton 5 oil holes 52 corresponding positions, this oil inlet hole 13 is connected with oil hole 52 and is provided with oil connection 14 on oil inlet hole 13, these oil connection 14 1 ends and oil inlet hole 13 fix, the other end is connected with the oil pipe of oil pump, oil pump can make the sealing that fits of valve seat 4 and butterfly plate 2 to valve seat 4 cavity volumes 41 pump-in pressure oil, and the pressure P 3 of pressure oil is greater than the pressure medium P1 of valve body entrance point 11 and the pressure medium P2 of outlet end 12.Adopt this structure, butterfly valve need be used with an oil pump, when valve rod 3 orders about butterfly plate 2 rotary closing valves under the driving of operating device 6, owing to have the gap between valve seat 4 and the butterfly plate 2, so just can realize closing of zerofriction force, reduce the operation moment of torsion of valve when closing; And when butterfly plate 2 is closed, oil pump starts synchronously and the oil inlet hole 13 of pressure oil through valve body 1 is transported in the oil hole 52 of skeleton 5, again in oil hole 52 enters the cavity volume 41 of valve seat 4, because skeleton 5 is provided with circular groove 51 with an end face of valve seat 4, pressure oil can disperse rapidly along the circular groove 51 of skeleton 5 behind the cavity volume 41 that enters valve seat 4, the cavity volume 41 of valve seat 4 under the effect of pressure oil to valve seat 4 center swell, thereby make the sealing surface 21 roof pressure applying mutually of sealing surface 42 with the butterfly plate 2 of valve seat 4, and since the pressure P 3 of pressure oil greater than the pressure medium P1 of valve body entrance point 11 and the pressure medium P2 of outlet end, excessive regardless of the pressure medium of the excessive still outlet end 12 of the pressure medium of working as butterfly valve entrance point 11 like this, all can avoid valve seat 4 that resiliently deformable takes place, realize the two way sealed of valve, guarantee its sealability; And when valve rod 3 rotates butterfly plate 2 Open valves under the driving of operating device 6, the oil pump close synchronously, pressure oil refluxes rapidly through the oil hole 52 of skeleton 5 and the oil inlet hole 13 of valve body 1, the cavity volume 41 of valve seat 4 shrinks rapidly under the effect that loses external pressure, the sealing surface 42 of valve seat 4 is separated with the sealing surface 21 of butterfly plate 2, so just can realize the frictionless unlatching; Because butterfly valve is when opening and closing, can realize zerofriction force between butterfly plate 2 and the valve seat 4, can farthest reduce the operation moment of torsion of valve when opening and closing like this, if it is pneumatic or electronic that the operating device of butterfly valve 6 adopts, this just can corresponding reduction pneumatic operator or the technical requirements of motor-operating mechanism, reduces the cost of production of butterfly valve.

Shown in Fig. 4, Fig. 5 embodiment, for the ease of butterfly valve when opening or closing, pressure oil can enter the cavity volume 41 of valve seat 4 rapidly or be back in the oil pump, uniformly around described skeleton 5 be arranged with a plurality of oil holes 52, each oil hole 52 communicates with the circular groove 51 of skeleton 5 respectively, and be provided with the annular connectivity slot 53 that is communicated with each oil hole 52 on the end face that skeleton 5 and valve body 1 fitted, this annular connectivity slot 53 is connected with the oil inlet hole 12 of valve body 1; A plurality of oil holes 52 are set on skeleton 5 and the annular connectivity slot 53 that is communicated with each oil hole 52 is set, like this when oil pump pump-in pressure when oil in valve seat 4 cavity volumes 41, pressure oil enters annular connectivity slot 53 and can enter rapidly by annular connectivity slot 53 in the cavity volume 41 that each oil hole 52 flows to valve seat 4 through the oil inlet hole 13 of valve body 1, pressure oil is disperseed, the sealed reaction time when shortening throttle down; Simultaneously, when opened butterfly valve, pressure oil in valve seat 4 cavity volumes 41 is back in the oil pump rapidly through each oil hole 52 and annular connectivity slot 53, the sealing surface 42 of valve seat 4 can be separated rapidly with the sealing surface 21 of butterfly plate, realize the nothing friction opening and closing of butterfly valve; Certainly the oil hole 52 on the skeleton 5 also can only be established one, so just need not to be provided with annular connectivity slot 53, pressure oil is after the oil inlet hole 13 of valve body 1 and the oil hole 52 on the skeleton 5 enter the cavity volume 41 of valve seat 4, through the circular groove 52 of skeleton 4 bottoms pressure oil is distributed to around valve seat 4 cavity volumes 41; But a plurality of oil holes 52 and annular connectivity slot 53 are set, can greatly improve the distribution rate of pressure oil like this, shorten butterfly valve in the reaction time of opening or closing, therefore, the embodiment of the invention is a preferred implementation.

The foregoing description should not be considered as limitation of the present invention, but any improvement of doing based on spirit of the present invention, all should be within protection scope of the present invention.

Claims

1. a two way sealed does not have the friction butterfly valve, and it includes valve body, butterfly plate and valve rod, and valve seat is installed in valve body, and the butterfly plate in described valve rod passes valve body and places valve body links to each other; It is characterized in that having the gap between the sealing surface of described valve seat and butterfly plate, in described valve seat, be provided with cavity volume, skeleton and skeleton one end face and valve body are installed in this cavity volume to fit, on an end end face of skeleton and the applying of valve seat cavity volume, be provided with circular groove, skeleton is provided with and runs through the oil hole skeleton two ends and that communicate with circular groove, be provided with oil inlet hole on the described valve body with on the corresponding position of skeleton oil hole, this oil inlet hole is connected with oil hole and is provided with oil connection on oil inlet hole, this oil connection one end and oil inlet hole fix, the other end is connected with the oil pipe of oil pump, and oil pump can make the sealing that fits of valve seat and butterfly plate to valve seat cavity volume pump-in pressure oil.

2. a kind of two way sealed according to claim 1 does not have the friction butterfly valve, it is characterized in that uniformly around the described skeleton being arranged with a plurality of oil holes, each oil hole communicates with the circular groove of skeleton respectively, and be provided with the annular connectivity slot that is communicated with each oil hole on the end face that skeleton and valve body are fitted, this annular connectivity slot is connected with the oil inlet hole of valve body.