CN203516765U - Jamming-preventing butterfly valve special for gas - Google Patents

Abstract

The utility model discloses a special anti-jamming butterfly valve for gas, which belongs to a pipeline cut-off and flow control device. The characteristic is that the two ends of the valve body are provided with bearing brackets along the center line, and the outer ends of the bearing brackets are provided with grooves. The valve shaft is set with two sets of external bearings, and the external bearings are installed in the grooves. The upper end bearing passes through the gland of the valve shaft and is fixed on the valve body, and the valve shaft is positioned and fixed on the valve body by the external bearing. The advantage is that the structure of the butterfly valve is simple. By adding an external bearing, the processing and assembly gap between the valve shaft and the valve body is increased, which effectively solves the problem of butterfly valve stuck, reduces the frequency and difficulty of butterfly valve maintenance, eliminates potential safety hazards, and reduces maintenance costs. A dust-proof ring and an O-ring are installed at the contact between the shaft and the valve body to prevent impurities from entering the sealing ring and ensure the sealing effect of the sealing ring; an oil-filled lubricating cavity is formed between the dust-proof ring and the outer sealing packing to reduce the rotational resistance of the butterfly valve, and at the same time Reduce the entry of impurities and enhance the sealing effect of the butterfly valve.

Description

Anti-jamming butterfly valve for gas

technical field

The utility model belongs to a pipeline cut-off and flow control device, in particular to a butterfly valve used for gas pipeline opening and closing and flow control.

Background technique

Butterfly valves are widely used in pipelines in the fields of petroleum, chemical industry, metallurgy, and hydropower. At present, the butterfly valve used is composed of a valve body, a valve plate, a valve shaft and a sealing sleeve. The valve plate is fixed on the valve shaft, placed in the valve cavity of the valve body, and positioned by the sealing sleeve nested on the valve shaft. The advantages are that the butterfly valve is small in size, light in weight, simple in structure and quick to open and close. The disadvantage is that the processing and assembly gap between the journal and the sleeve of this butterfly valve is as small as 0.5mm. Leakage seriously affects the safety of equipment operation; frequent accidents and replacement of new butterfly valves increase spare parts costs and maintenance costs, affecting production.

Contents of the invention

In order to overcome the defects existing in the prior art, the utility model provides a special anti-jamming butterfly valve for gas, which solves the problem of butterfly valve switch jamming and even does not rotate, reduces the frequency and difficulty of butterfly valve maintenance, reduces the consumption of spare parts, and eliminates potential safety hazards .

The special anti-jamming butterfly valve for gas includes a valve body, a valve plate and a valve shaft. The valve plate is fixed on the valve shaft and placed in the valve cavity of the valve body. The cover is fixed on the valve body by bolts. It is characterized in that the two ends of the valve body are provided with bearing brackets along the center line, and the outer ends of the bearing brackets are provided with grooves. The valve shaft is set with two sets of external bearings. The bearing is fixed on the valve body by the end cover, the upper end bearing passes through the gland of the valve shaft and is fixed on the valve body, and the valve shaft is positioned and fixed on the valve body by the external bearing. The gap between the valve shaft and the valve body increases by 8 to 10 times.

The utility model is further improved. The external bearing adopts a self-lubricating bearing, the inner ring of which is transitionally fitted with the valve shaft, and the outer ring is transitionally fitted in the groove; the lower bearing is fixed by the end cover, and the end cover is fixed on the valve body ; The upper bearing is fixed through the gland of the valve shaft, and the gland is fixed on the valve body. The valve shaft rotates with the rotation of the external bearing.

The utility model is further improved. A sealing ring is provided at the contact between the valve shaft and the valve body. The sealing ring is composed of a dust-proof ring and an O-ring. The sealing ring has a sealing effect to prevent the butterfly valve from jamming.

The utility model is further improved. An oil injection lubricating cavity is formed between the dust-proof rings on the upper and lower parts of the valve body and the filler. The cavity communicates with the oil injection hole on the valve body, and the lubricating grease is injected through the oil injection hole to reduce the rotation of the butterfly valve. resistance, while reducing the entry of impurities and enhancing the sealing effect of the butterfly valve.

Compared with the prior art, the advantages are:

1. The structure of the butterfly valve is simple. By adding an external bearing, the processing and assembly gap between the valve shaft and the valve body is increased, which effectively solves the problem of butterfly valve stuck, reduces the frequency and difficulty of butterfly valve maintenance, eliminates potential safety hazards, and reduces maintenance costs;

2. A dust-proof ring and an O-ring are installed at the contact between the valve shaft and the valve body to prevent impurities from entering the sealing ring and ensure the sealing effect of the sealing ring;

3. An oil-filled lubricating cavity is formed between the dust-proof ring and the outer sealing packing, which reduces the rotational resistance of the butterfly valve, reduces the entry of impurities at the same time, and enhances the sealing effect of the butterfly valve.

Description of drawings

Figure 1 is a cross-sectional view of a special anti-jamming butterfly valve for gas;

Fig. 2 is the enlarged view of part I of Fig. 1;

Fig. 3 is an enlarged view of part II of Fig. 1 .

In the figure: 1-end cover, 2-bearing, 2′-bearing, 3-bearing bracket, 3′-bearing bracket, 4-packing gland, 4′-packing gland, 5-valve body, 6-bolt, 7-Packing, 7'-Packing, 8-Oil injection lubrication chamber, 8'-Oil injection lubrication chamber, 9-Valve shaft, 10-Valve chamber, 11-Valve plate, 12-Gland, 13-Oil injection hole, 13 '-oil hole, 14-sealing ring, 14'-sealing ring.

Detailed ways

Below in conjunction with embodiment and accompanying drawing, the utility model is further described.

Embodiment As can be seen from Figures 1 to 3, the special anti-jamming butterfly valve for gas includes a valve body 5, a valve plate 11 and a valve shaft 9, the valve plate is fixed on the valve shaft, placed in the valve cavity of the valve body, and the packing (7 ; 7') is located in the contact gap set between the valve shaft and the valve body, the packing gland (4; 4') is fixed on the valve body by bolts 6, and the two ends of the valve body are provided with bearing brackets (3; 3 ′), the outer end of the bearing bracket is provided with grooves, the valve shaft is set with two sets of external bearings (2; 2′), the external bearings are installed in the grooves, the lower end bearing 2 is fixed on the valve body by the end cover 1, and the upper end bearing 2' passes through the gland 12 of the valve shaft and is fixed on the valve body, and the valve shaft is positioned and fixed on the valve body by an external bearing. The gap between the valve shaft and the valve body increases by 8 to 10 times.

It can be seen from Figure 1 that the external bearing (2; 2′) is a self-lubricating bearing, the inner ring of which is in transition fit with the valve shaft 9, and the outer ring is in transition fit in the groove; the lower end bearing 2 is formed by the end cover 1 is fixed, the end cover is fixed on the valve body; the upper end bearing 2' is fixed through the gland 12 of the valve shaft, and the gland is fixed on the valve body. The valve shaft rotates with the rotation of the external bearing.

It can be seen from Figure 1 that a sealing ring (14; 14') is provided at the contact between the valve shaft 9 and the valve body 5. The sealing ring is composed of a dust-proof ring and an O-ring, and the dust-proof ring is 10mm closer to the inner side of the valve body. , can prevent impurities from entering the sealing ring, ensure the sealing effect of the sealing ring, and prevent the butterfly valve from jamming.

It can be seen from Fig. 1 that an oil-filled lubricating cavity (8; 8') is formed between the dust-proof rings on the upper and lower parts of the valve body 5 and the packing (7; 7'), and the cavity and the oil-filling hole on the valve body (13; 13') connected, add lubricating grease through the oil injection hole, reduce the rotation resistance of the butterfly valve, reduce the entry of impurities at the same time, and enhance the sealing effect of the butterfly valve.

Claims (4)

1. the special-purpose anti-block butterfly valve of coal gas, comprises valve body (5), valve plate (11) and valve shaft (9), and valve plate (11) fixedly valve shaft (9) is upper, is placed in the valve pocket of valve body (5) filler (7; 7 ') be located at contacting in gap that valve shaft (9) and valve body (5) set, Gland (4; 4 ') by bolt (6), be fixed on valve body (5) above, it is characterized in that: valve body (5) two ends arrange bearing bracket (3 along center line; 3 '), bearing bracket (3; 3 ') outer end arranges groove, two groups of outboard bearings (2 of valve shaft (9) suit; 2 '), outboard bearing (2; 2 ') pack in groove, it is upper that bottom end bearing (2) is fixed on valve body (5) by end cap (1), and upper end bearing (2 ') is fixed on valve body (5) above through the gland (12) of valve shaft (9), and valve shaft (9) is by outboard bearing (2; 2 ') location be fixed on valve body (5).

2. the special-purpose anti-block butterfly valve of coal gas according to claim 1, is characterized in that: described outboard bearing (2; 2 ') adopt self oiling bearing, its inner ring and valve shaft (9) transition fit, outer ring transition fit is arranged in groove; Bottom end bearing (2) is fixing by end cap (1), and end cap (1) is fixed on valve body (5); Upper end bearing (2 ') is fixing through the gland (12) of valve shaft (9), and gland (12) is fixed on valve body (5).

3. the special-purpose anti-block butterfly valve of coal gas according to claim 1, is characterized in that: in described valve shaft (9) and valve body (5) contacting point, establish seal ring (14; 14 '), sealing circle consists of dust ring and O type circle, and dust ring is near valve body (5) inner side 10mm.

4. the special-purpose anti-block butterfly valve of coal gas according to claim 1, is characterized in that: dust ring and filler (7 in described valve body (5) upper and lower part; 7 ') between form oil injecting lubricating cavity (8; 8 '), cavity (8; 8 ') and the upper oil hole (13 of valve body (5); 13 ') be communicated with.

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