CN201177051Y

CN201177051Y - Butterfly valve

Info

Publication number: CN201177051Y
Application number: CNU2008200696658U
Authority: CN
Inventors: 房四平; 房家平; 张波; 何余
Original assignee: ZHENGZHOU ZHENGDIE VALUE CO Ltd
Current assignee: ZHENGZHOU ZHENGDIE VALUE CO Ltd
Priority date: 2008-03-20
Filing date: 2008-03-20
Publication date: 2009-01-07
Anticipated expiration: 2018-03-20

Abstract

The utility model discloses a butterfly valve which comprises a valve shaft, a butterfly plate (7) and a valve body (4), wherein the valve shaft is inserted into the valve body (4) and the butterfly plate (7); and the valve shaft and the butterfly plate (7) are fixedly connected by an expansion pin (6) which is inserted into the valve shaft and the butterfly plate (7). With the structure of the butterfly valve, a gapless fit between the valve shaft and the butterfly plate (7) is formed, thereby ensuring no relative motion between the valve shaft and the butterfly plate (7). The butterfly valve also carries out axial positioning to two ends of a butterfly valve shaft system respectively; therefore, when the butterfly valve shaft system is stressed, the butterfly valve shows good rigidity and small deformation, which contributes to the opening and closing of the valve and is uneasy to damage the sealing conditions of the two ends of the valve shaft.

Description

A kind of butterfly valve

Technical field

The utility model relates to a kind of valve, especially a kind of butterfly valve.

Background technique

Butterfly valve is used in the middle of the various pipelines widely, the market existing reed valve, particularly bigbore butterfly valve often adopts pin to connect valve shaft and butterfly plate, there is certain clearance between pin and the pin-and-hole, therefore when valve shaft rotates, the rotation and the valve shaft that can not guarantee butterfly plate are synchronous fully, it is the relative movement that can exist between valve shaft and butterfly plate to a certain degree, though this relative movement is small, but the not only operation of inconvenient valve, also can make pin with the friction of pin-and-hole in quicken to damage, the gap between pin and the pin-and-hole also makes and necessitates at pin-and-hole opening installing seal arrangement simultaneously, otherwise shank will bear the corrosion of pipeline liquid for a long time, quicken the damage of shank.In addition, the axle system of market existing reed valve is generally an end and fixes an end activity, makes that the rigidity of axle system is relatively poor, more yielding, and destroying axle easily is the sealing condition at two ends.

The model utility content

The purpose of this utility model is to provide the butterfly valve that adopts pin to be connected between a kind of valve shaft and butterfly plate, and this pin is connected to the cooperation of no gap, thus good seal between no relative movement and pin and the pin-and-hole between assurance valve shaft and the butterfly plate.

For achieving the above object, butterfly valve of the present utility model comprises valve shaft, butterfly plate, valve body, and valve shaft is inserted in valve body and the butterfly plate, fixedlys connected by expansion pin between valve shaft and the butterfly plate, and expansion pin is inserted in valve shaft and the butterfly plate.

As a kind of improvement of the present utility model, described expansion pin comprises nut, resilient pad, gland and the expansion sleeve that two ends are stretched out the shank of butterfly plate and are provided with in pairs, the section radius at described shank middle part is greater than the section radius at shank two ends, be the transition frustum between shank middle part and the two ends, the transition frustum is arranged on the cooperation place of valve shaft and butterfly plate, expansion sleeve, gland, resilient pad are set in the transition frustum from inside to outside successively to the shank end, and nut is screwed onto the shank outermost end.

As further improvement of the utility model, described valve shaft comprises valve shaft, lower valve shaft, and described butterfly valve also includes Packing seat and is set on the valve shaft and is fixedly connected on the Gland of valve body upper end; The described valve shaft of going up is the step axle, and Gland blocks step on the valve shaft by Packing seat;

As further improvement of the utility model, described butterfly valve also includes lower end cap and is installed in the snap ring of splitting on the lower valve shaft by annular groove, splits the part that snap ring protrudes the lower valve shaft surface and is overlayed on the lower end surface of valve body by lower end cap.

As further improvement of the utility model, on last valve shaft, be provided with four expansion pin, on lower valve shaft, be provided with two expansion pin.

Adopt structure of the present utility model, adopt expansion pin to fixedly connected between butterfly plate and the valve shaft, the guide of expansion pin expands when mounted, make and form no gap between pin and the pin-and-hole and cooperate, realized the sealing between pin and the pin-and-hole, valve shaft is fixedlyed connected with butterfly plate to be integral, having guaranteed does not have relative movement between valve shaft and the butterfly plate, thereby need not opening at pin-and-hole is provided with sealing and can avoids pipeline fluid to enter pin-and-hole causing the shank corrosion, also avoided the shank wearing and tearing that exist relative movement to cause between valve shaft and the butterfly plate.The upper and lower valve shaft of fixedlying connected with butterfly plate is respectively by Packing seat with split snap ring and limit axial position, make that the axle of valve is that two ends are fixed, when stressed axle be rigidity performance better, be out of shape for a short time, so more help the keying of valve and be not easy to destroy the sealing condition at valve shaft two ends.Go up the suffered moment of torsion of valve shaft in the practice during opening/shutting valve greater than the suffered moment of torsion of lower valve shaft, so valve shaft is provided with four on the expansion pin correspondence, corresponding lower valve shaft only is provided with two, can save parts when satisfying valve shaft to be the rigidity needs, the saving cost.

Description of drawings

Fig. 1 is a structural representation of the present utility model;

Fig. 2 is the mounting structure schematic representation of expansion pin of the present utility model.

Embodiment

As shown in Figure 1, butterfly valve of the present utility model comprises valve shaft 5, lower valve shaft 8, expansion pin 6, butterfly plate 7 and valve body 4, the two ends up and down of last valve shaft 5 are inserted in the top of valve body 4 and the top of butterfly plate 7 respectively, and the two ends up and down of lower valve shaft 8 are inserted in the bottom of butterfly plate 7 and the bottom of valve body 4 respectively.Fixedly connected by four expansion pin 6 between butterfly plate 7 and the last valve shaft 5, fixedly connected by two expansion pin 6 between butterfly plate 7 and the lower valve shaft 8.Certainly, on the upper and

lower valve shaft

5,8 the number of fixedly connected expansion pin 6 can be increased and decreased as required.

Be the axial motion of restriction valve shaft, butterfly valve of the present utility model also includes and splits snap ring 9, is fixedly connected on lower end cap 10, the double-deck Packing seat 3 of valve body 4 lower ends and is set on the valve shaft 5 and is fixedly connected on the Gland 2 of valve body 4 upper ends by bolt 1 by bolt 11.The described valve shaft 5 of going up is the step axle, and Gland 2 blocks step on the valve shaft 5 by Packing seat 3, thereby has limited the axial motion of last valve shaft 5.Split snap ring 9 and be arranged in the annular groove on the lower valve shaft 8, split the part that snap ring 9 protrudes lower valve shafts 8 surfaces and overlayed on the lower end surface of valve body 4, therefore split the axial motion that snap ring 9 has limited lower valve shaft 8 by lower end cap 10.Thus, the axial motion at upper and

lower valve shaft

5,8 two ends all is limited, when therefore stressed axle be the rigidity performance better, be out of shape for a short time, help the keying of valve and be not easy to destroy the sealing condition at valve shaft two ends.

As shown in Figure 2, expansion pin 6 of the present utility model comprises that two ends stretch out the shank 21 of butterfly plate 7 and nut 12, resilient pad 13, gland 14 and the expansion sleeve 15 that is provided with in pairs, the section radius at the middle part of described shank 21 is greater than the section radius at shank 21 two ends, be transition frustum 20 between shank 21 middle parts and the two ends, transition frustum 20 is arranged on the cooperation place of valve shaft and butterfly plate 7, expansion sleeve 15, gland 14, resilient pad 13 are set in the end of transition frustum 20 to shank 21 from inside to outside successively, and nut 12 is screwed onto shank 21 outermost end.Compress two nuts 12 during installation and make inwardly motion and fit mutually of two expansion sleeves 15 with transition frustum 20, this moment, expansion sleeve 15 was formed interference fit greatly and with pin-and-hole by 20 supports of transition frustum, thereby realize that valve shaft cooperates with the no gap of butterfly plate 7, valve shaft is fixedlyed connected with butterfly plate be integral, having guaranteed does not have relative movement between valve shaft and the butterfly plate.

Claims

1. a butterfly valve comprises valve shaft, butterfly plate (7), valve body (4), and valve shaft is inserted in valve body (4) and the butterfly plate (7), it is characterized in that: fixedly connected by expansion pin (6) between valve shaft and the butterfly plate (7), expansion pin (6) is inserted in valve shaft and the butterfly plate (7).

2. butterfly valve as claimed in claim 1, it is characterized in that: described expansion pin (6) comprises nut, resilient pad, gland and the expansion sleeve that two ends are stretched out the shank of butterfly plate (7) and are provided with in pairs, the radius at described shank middle part is greater than the radius at shank two ends, be the transition frustum between shank middle part and the two ends, the transition frustum is arranged on the cooperation place of valve shaft and butterfly plate; Expansion sleeve, gland, resilient pad are set in the transition frustum from inside to outside successively to the shank end, and nut is screwed onto the shank outermost end.

3. butterfly valve as claimed in claim 1 or 2, it is characterized in that: described valve shaft comprises valve shaft (5), lower valve shaft (8), and described butterfly valve also includes Packing seat (3) and is set in the Gland (2) that valve body (4) upper end was gone up and be fixedly connected on to valve shaft (5); The described valve shaft (5) of going up is the step axle, and Gland (2) blocks step on the valve shaft (5) by Packing seat (3).

4. butterfly valve as claimed in claim 3, it is characterized in that: described butterfly valve also includes lower end cap (10), is installed in by annular groove and splits snap ring (9) on the lower valve shaft (8), splits the part that snap ring (9) protrudes lower valve shaft (8) surface and is overlayed on the lower end surface of valve body (4) by lower end cap (10).

5. butterfly valve as claimed in claim 3 is characterized in that: be provided with 4 expansion pin (6) on last valve shaft (5), be provided with 2 expansion pin (6) on lower valve shaft (8).

6. butterfly valve as claimed in claim 4 is characterized in that: be provided with 4 expansion pin (6) on last valve shaft (5), be provided with 2 expansion pin (6) on lower valve shaft (8).