Butterfly valve with integrated valve plate and valve shaft

Abstract

A valve plate and valve shaft integrated butterfly valve comprises a valve body, an inlet and an outlet are formed in the two sides of the valve body respectively, the valve plate and the valve shaft are arranged in the valve body, the valve shaft is connected to the upper side of the valve plate, the valve plate and the valve shaft are integrally formed, a main sealing piece is arranged in the inlet of the valve body and on the outer side of the valve plate, and a pressing plate is arranged on the outer side of the main sealing piece. The main sealing piece is located between the valve plate and the pressing plate, a groove is formed in the outer side face of the main sealing piece in the circumferential direction, a V-shaped spring is arranged in the groove, the outer side of the V-shaped spring makes contact with the pressing plate, an air inlet gap is formed between the main sealing piece and the pressing plate, one end of the air inlet gap is communicated with an inlet of the valve body, and the other end of the air inlet gap is communicated with the groove. According to the butterfly valve, a lower follow-up shaft in a conventional butterfly valve is omitted, the upper valve shaft and the valve plate are made into a whole and are integrally formed, the circulation area and the maximum flow rate when the butterfly valve is fully opened are effectively increased, and the manufacturing difficulty and the structural complexity of the butterfly valve are reduced.

Description

Technical Field

[0001] The utility model relates to the mechanical field, in particular to a valve, and especially to an integral butterfly valve with a valve plate and a valve shaft. Background Art

[0002] A butterfly valve is a regulating valve that can be used for the on-off control of pipeline media. The opening and closing member of the butterfly valve is a disc-shaped butterfly plate that rotates around its own axis in the valve body to achieve the purpose of opening, closing or regulating. In the prior art, the butterfly valve uses two upper and lower valve shafts to fix the valve plate. The dimensional structure at the connection between the upper and lower valve shafts and the valve plate is relatively complex, which affects the maximum flow rate when the butterfly valve is fully opened and increases the manufacturing difficulty of the butterfly valve. Summary of the Invention

[0003] The purpose of the utility model is to provide an integral butterfly valve with a valve plate and a valve shaft, and the integral butterfly valve with a valve plate and a valve shaft is to solve the technical problems that the dimensional structure at the connection between the valve shaft and the valve plate in the prior art affects the maximum flow rate when the butterfly valve is fully opened and increases the manufacturing difficulty of the butterfly valve.

[0004] An integral butterfly valve with a valve plate and a valve shaft of the utility model comprises a valve body. Inlets and outlets are respectively arranged on both sides of the valve body. A valve plate and a valve shaft are arranged in the valve body. The valve shaft is connected to the upper side of the valve plate. The valve plate and the valve shaft are integrally formed. A main seal is arranged in the inlet of the valve body and on the outer side of the valve plate. A pressing plate is arranged on the outer side of the main seal. The main seal is located between the valve plate and the pressing plate. A groove is arranged along the circumferential direction on the outer side surface of the main seal. A V-shaped spring is arranged in the groove. The outer side of the V-shaped spring contacts with the pressing plate. An air inlet gap is arranged between the main seal and the pressing plate. One end of the air inlet gap communicates with the inlet of the valve body, and the other end of the air inlet gap communicates with the groove.

[0005] Further, a first O-ring is arranged between the pressing plate and the valve body.

[0006] Further, a first shaft sleeve, a second O-ring, and a second shaft sleeve are sequentially arranged between the valve shaft and the valve body from bottom to top. A third O-ring is arranged between the second shaft sleeve and the valve body. A fourth O-ring is arranged between the second shaft sleeve and the valve shaft.

[0007] Compared with the prior art, the effects of the present utility model are positive and obvious. The present utility model abandons the lower follower shaft in the conventional butterfly valve, and makes the upper valve shaft and the valve plate into an integral body, which is integrally formed, effectively improving the flow area and maximum flow rate when the butterfly valve is fully opened, and reducing the manufacturing difficulty and structural complexity of the butterfly valve. The V-shaped spring is fixed by the pressure plate. When the valve plate is closed, the air on the pressure side enters the groove of the main seal through the air inlet gap between the seal and the pressure plate, serving as the seal force compensation under high-pressure conditions, and acting simultaneously with the V-shaped spring to improve the pressing force and sealing effect between the main seal and the valve plate. Due to the compensation effect of the seal force under high pressure, the initial seal pressure can be reduced, the wear during valve opening and closing can be reduced to improve the service life, and at the same time, less force is required for valve opening and closing, making it convenient to use a relatively small driving or remote control mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 FIG. is a schematic cross-sectional view of an integral butterfly valve with a valve plate and a valve shaft according to the present utility model.

[0009] Figure 2 is Figure 1 a partially enlarged schematic view of.

[0010] Figure 3 FIG. is a front view schematic diagram of an integral butterfly valve with a valve plate and a valve shaft according to the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0011] The present utility model will be further described below in conjunction with embodiments, but the present utility model is not limited to these embodiments. Any similar structure and its similar variations using the present utility model should be included in the protection scope of the present utility model. The use of directions such as up, down, front, back, left, and right in the present utility model is only for convenient and clear description, and does not limit the technical solution of the present utility model.

[0012] As Figures 1 - 3 shown, an integral butterfly valve with a valve plate and a valve shaft according to the present utility model includes a valve body 1. Inlets 2 and outlets 3 are respectively arranged on both sides of the valve body 1. A valve plate 4 and a valve shaft 5 are arranged in the valve body 1. The valve shaft 5 is connected to the upper side of the valve plate 4. The valve plate 4 and the valve shaft 5 are integrally formed. A main seal 6 is arranged outside the valve plate 4 in the inlet 2 of the valve body 1. A pressure plate 7 is arranged outside the main seal 6. The main seal 6 is located between the valve plate 4 and the pressure plate 7. A groove 8 is arranged along the circumferential direction on the outer side surface of the main seal 6. A V-shaped spring 9 is arranged in the groove 8. The outer side of the V-shaped spring 9 contacts the pressure plate 7. An air inlet gap 10 is arranged between the main seal 6 and the pressure plate 7. One end of the air inlet gap 10 communicates with the inlet 2 of the valve body 1, and the other end of the air inlet gap 10 communicates with the groove 8.

[0013] Further, a first O-ring 11 is arranged between the pressure plate 7 and the valve body 1.

[0014] Furthermore, a first bushing 12, a second O-ring 13, and a second bushing 14 are sequentially arranged between the valve shaft 5 and the valve body 1 from bottom to top. A third O-ring 15 is arranged between the second bushing 14 and the valve body 1, and a fourth O-ring 16 is arranged between the second bushing 14 and the valve shaft 5.

[0015] Specifically, the valve body 1, the main seal 6, the pressure plate 7, the V-shaped spring 9, the O-ring, the bushing, etc. in this embodiment all adopt well-known solutions in the prior art, which are already understood by those skilled in the art and will not be elaborated here.

[0016] Taking the working in a pressure gas transmission pipeline as an example, the working principle of the present utility model is as follows:

[0017] 1. The present utility model abandons the lower follower shaft in the conventional butterfly valve, and makes the upper valve shaft 5 and the valve plate 4 into an integral body, which is integrally formed, effectively improving the flow area and the maximum flow rate when the butterfly valve is fully opened, and reducing the manufacturing difficulty and the structural complexity of the butterfly valve.

[0018] 2. The V-shaped spring 9 is fixed by the pressure plate 7. When the valve plate 4 is closed, as Figure 2 shown, the air on the pressure side enters the groove 8 of the main seal 6 from the air inlet gap 10 between the seal and the pressure plate 7, serving as the sealing force compensation under high pressure conditions, and acting simultaneously with the V-shaped spring 9 to improve the pressing force and the sealing effect between the main seal 6 and the valve plate 4.

[0019] Due to the compensation effect of the sealing force under high pressure, the initial sealing pressure can be reduced, the wear during valve opening and closing can be reduced to improve the service life, and at the same time, less force is required for valve opening and closing, which is convenient for using a relatively small driving or remote control mechanism.

[0020] 3. The pressure plate 7 is used to fix the main seal 6 to prevent the main seal 6 from being blown out by the high-speed air flow.

[0021] 4. The first O-ring 11 on the pressure plate 7 is used to improve the sealing reliability.

Claims

1. An integral butterfly valve with a valve plate and a valve shaft, characterized in that It includes a valve body. An inlet and an outlet are respectively arranged on both sides of the valve body. A valve plate and a valve shaft are arranged in the valve body. The valve shaft is connected to the upper side of the valve plate, and the valve plate and the valve shaft are integrally formed. A main seal is arranged on the outside of the valve plate in the inlet of the valve body. A pressing plate is arranged on the outside of the main seal. The main seal is located between the valve plate and the pressing plate. A groove is arranged along the circumferential direction on the outer side surface of the main seal. A V-shaped spring is arranged in the groove. The outer side of the V-shaped spring contacts the pressing plate. An air inlet gap is arranged between the main seal and the pressing plate. One end of the air inlet gap communicates with the inlet of the valve body, and the other end of the air inlet gap communicates with the groove.

2. The integral butterfly valve of valve plate and valve shaft according to claim 1, characterized in that A first O-ring is arranged between the pressing plate and the valve body.

3. The integral butterfly valve of valve plate and valve shaft according to claim 1, characterized in that, A first shaft sleeve, a second O-ring, and a second shaft sleeve are successively arranged between the valve shaft and the valve body from bottom to top. A third O-ring is arranged between the second shaft sleeve and the valve body, and a fourth O-ring is arranged between the second shaft sleeve and the valve shaft.

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