Leak-proof soft sealing butterfly valve

Abstract

The utility model discloses a leakproof soft seal butterfly valve which is provided with a valve body, a valve shaft, a butterfly plate, a front valve shaft seat and a rear valve shaft seat, a shaft sleeve is arranged in the front valve shaft seat, a packing gland is covered on the front valve shaft seat, and an annular packing space is defined by the front end of the shaft sleeve, the rear end of the packing gland, the outer wall of the valve shaft and the inner wall of the front valve shaft seat; a valve seat is arranged in the valve body, a rubber sealing ring is installed on the butterfly plate and composed of a left rubber ring, a right rubber ring and a steel ring in the middle, an annular cavity is defined by the end face of the valve seat, the opposite inner walls of the left rubber ring and the right rubber ring and the outer wall of the steel ring, and an upper drainage hole and a lower water injection hole which are communicated with the annular cavity are formed in the top and the bottom of the valve body respectively. The upper drain hole and the lower water injection hole are respectively provided with upper and lower pipeline connectors; a metal packing ring arranged outside the valve shaft in a sleeving mode is arranged in the annular packing space, and an inner side rubber sealing ring and an outer side rubber sealing ring are arranged on the inner wall and the outer wall of the metal packing ring respectively. By means of the butterfly valve, leakage of media along the valve shaft and leakage of the media between the butterfly plate and the valve seat can be effectively prevented.

Description

TECHNICAL FIELD

[0001] The utility model relates to a soft sealing butterfly valve, in particular to a leakproof soft sealing butterfly valve. BACKGROUND

[0002] The soft sealing butterfly valve in prior art has a valve body, a valve shaft, a butterfly plate installed on the valve shaft, and a front valve shaft seat and a rear valve shaft seat for installing the valve shaft, the front valve shaft seat is internally provided with a shaft sleeve, a packing gland is installed on the front valve shaft seat, and an annular packing space is formed between the front end of the shaft sleeve, the rear end of the packing gland, the outer wall of the valve shaft and the inner wall of the front valve shaft seat; the valve body is internally provided with a valve seat, and the butterfly plate is provided with a rubber sealing ring matched with the valve seat through a pressing ring.

[0003] The soft sealing butterfly valve in prior art has a rubber sealing ring with a T-shaped cross section installed on the butterfly plate, and sometimes the sealing is not strict and leakage occurs during use; meanwhile, the annular packing space is provided with a packing ring, the packing ring is usually composed of fiber, lubricant and various metal wire reinforcing agents, the packing ring sealing structure also has the defects of easy leakage, and the contact area between the packing ring sealing structure and the valve shaft is large, the friction resistance is large when the valve shaft rotates, and the power consumption and wear are large. UTILITY MODEL CONTENTS

[0004] The utility model solves the technical problem to provide a leakproof soft sealing butterfly valve, and the medium along the valve shaft and the medium between the butterfly plate and the valve seat can be effectively prevented from leaking after the utility model is applied.

[0005] The utility model discloses a kind of leak-proof soft sealing butterfly valves, with valve body, valve shaft, butterfly plate installed on valve shaft and install the front valve shaft seat and rear valve shaft seat of the valve shaft, the front valve shaft seat is equipped with shaft sleeve, front valve shaft seat is equipped with packing gland, annular packing space is formed between the inner wall of the shaft sleeve front end, packing gland rear end, valve shaft outer wall and front valve shaft seat, the valve body is equipped with valve seat, the rubber sealing ring that is matched with the valve seat is pressed by pressure ring and is equipped on the butterfly plate, it is characterized in that: the rubber sealing ring is composed of left and right rubber ring and steel ring between left and right rubber ring, when left and right rubber ring are sealed and matched with the valve seat, annular chamber is formed between the end face of valve seat, the relative inner wall of left and right rubber ring and the outer wall of steel ring, the top and bottom of the valve body are respectively provided with upper drain hole and lower water injection hole, which are communicated with the annular chamber, and upper drain hole and lower water injection hole are respectively equipped with upper and lower pipeline connection joints at the orifice of valve body outer wall;Annular packing space is provided with metal packing ring sleeved on the outer wall of valve shaft, and inner and outer wall of front and rear of metal packing ring is respectively machined with inner side wall annular groove and outer side wall annular groove, and inner and outer side wall annular groove is respectively equipped with inner side rubber sealing ring and outer side rubber sealing ring.

[0006] As the improvement of the utility model, the inner and outer wall of the middle part of the metal packing ring is respectively machined with inner annular middle recess and outer annular middle recess with rectangular cross section, and the upper and lower radial packing through holes are provided in the middle part of the metal packing ring, which pass through the inner and outer annular middle recesses, and the upper and lower radial through holes of the shaft seat are provided in the front valve shaft seat, which are communicated with the upper and lower radial packing through holes, and the upper and lower radial through holes of the shaft seat are respectively equipped with upper drain pipeline joint and lower water injection pipeline joint at the orifice position of the outer wall of the front valve shaft seat.

[0007] When the utility model is used, the upper and lower pipeline connection joints at the upper drain hole and the lower water injection hole are respectively connected with the drain pipeline and the water injection pipeline, the water injected through the water injection pipeline can fill the annular chamber, form a strict water seal, and then be discharged through the drain pipeline, and the water injection and drainage cycle can realize the strict sealing of the sealing ring and the valve seat, isolate the medium, and effectively prevent the leakage of the medium between the butterfly plate and the valve seat; at the same time, the upper drain pipeline joint and the lower water injection pipeline joint installed on the front valve shaft seat are also respectively connected with the drain pipeline and the water injection pipeline, the water injected through the water injection pipeline can fill the inner and outer annular middle recesses in the middle part of the metal packing ring, and then be discharged through the drain pipeline, and the water injection and drainage cycle can realize the strict sealing between the metal packing ring and the valve shaft, effectively prevent the leakage of the medium along the valve shaft. BRIEF DESCRIPTION OF DRAWINGS

[0008] The utility model will be further described in detail in combination with the drawings.

[0009] Figure 1 This is a schematic diagram of the main structure of a leak-proof soft-seal butterfly valve according to this utility model.

[0010] Figure 2 It is along Figure 1 Schematic diagram of the cross-sectional structure along line AA in the middle.

[0011] Figure 3 This is a schematic diagram of the cross-sectional structure along line BB in section 1.

[0012] Figure 4 yes Figure 1 A cross-sectional view of the front valve shaft seat.

[0013] Figure 5 It is after removing the metal packing rings Figure 4 .

[0014] Figure 6 yes Figure 4 The image shows a magnified left view of the metal packing ring.

[0015] Figure 7 yes Figure 4 An enlarged schematic diagram of the metal packing ring is shown in the figure.

[0016] Figure 8 It is after removing the inner and outer rubber seals Figure 7 .

[0017] Figure 9 The diagram illustrates the sealing structure between the butterfly plate and the valve seat in a prior art soft-seal butterfly valve, wherein the sealing ring mounted on the butterfly plate is a rubber sealing ring with a T-shaped cross-section. Detailed Implementation

[0018] See Figure 1 - Figure 8The utility model discloses a kind of leakproof soft sealing butterfly valves, with valve body 1, valve shaft 2, butterfly plate 3 being installed on valve shaft and the front valve shaft seat 4 and rear end valve shaft seat 5 of installing the valve shaft, the front valve shaft seat 4 is internally provided with shaft sleeve 6, front valve shaft seat upper cover is provided with packing gland 7, the annular packing space 8 between the inner wall of the shaft sleeve 6 front end, packing gland 7 rear end, valve shaft 2 outer wall and front valve shaft seat 4 is formed;The valve body 1 is provided with valve seat 9, the rubber sealing ring 11 that is matched with the valve seat is pressed and mounted on the butterfly plate 3 by pressing ring 10, it is characterized in that: the rubber sealing ring 11 is composed of left and right rubber rings 111,113 with left and right two sections being L-shaped and steel ring 112 between left and right rubber rings, when left and right rubber rings are sealed and matched with the valve seat 9, the annular chamber 110 between the end face of valve seat 9, the relative inner wall of left and right rubber rings 111,113 and the outer wall of steel ring 112 is formed, the top and bottom of the valve body 1 are respectively provided with upper drain hole 12 and lower water injection hole 13 that pass through valve seat 9 and are connected with the annular chamber 110, and the upper drain hole and the lower water injection hole are respectively provided with upper and lower pipeline connection joints 14,15 at the hole of the outer wall of valve body;The annular packing space 8 is provided with metal packing ring 16 sleeved on the valve shaft 2, and the inner and outer walls of the front and rear of the metal packing ring are respectively machined with inner side wall annular groove 17 and outer side wall annular groove 18, and the inner and outer side wall annular grooves are respectively provided with inner side rubber sealing ring 19 and outer side rubber sealing ring 20, the structure form of the traditional packing seal packing valve shaft is changed in the utility model, and the rubber sealing ring arranged on the upper and lower parts is contacted with the valve shaft to seal, so that the contact area of the valve shaft and the sealing packing is greatly reduced, so that the power consumption and wear are relatively small. The inner and outer walls of the middle part of the metal packing ring 16 are respectively machined with inner annular middle groove 21 and outer annular middle groove 22 with rectangular section, and the upper and lower radial packing through holes 23,24 that pass through the inner and outer annular middle grooves are provided in the middle part of the metal packing ring, the upper and lower radial through holes 25,26 of the shaft seat that communicate with the upper and lower radial packing through holes 23,24 are provided on the front valve shaft seat 4, and the hole position of the upper and lower radial through holes on the outer wall of the front valve shaft seat is respectively provided with upper drain pipeline joint 27 and lower water injection pipeline joint 28.

[0019] Referring again to Figure 9 , Figure 9 The sealing structure between butterfly plate and valve seat in soft sealing butterfly valve in prior art is shown, and the sealing ring 11' installed on butterfly plate is rubber sealing ring with T-shaped section.

[0020] It can be understood that the above specific description of the utility model is only used for illustrating the utility model and is not limited to the technical scheme described in the utility model embodiment, and any modification or equivalent replacement to the utility model to achieve the same technical effect is within the protection scope of the utility model.

Claims

1. A leak-proof soft-seal butterfly valve, comprising a valve body (1), a valve shaft (2), a butterfly plate (3) mounted on the valve shaft, and a front valve shaft seat (4) and a rear valve shaft seat (5) for mounting the valve shaft, wherein a bushing (6) is installed inside the front valve shaft seat (4), and a packing gland (7) is installed on the top cover of the front valve shaft seat, and an annular packing space (8) is formed between the front end of the bushing (6), the rear end of the packing gland (7), the outer wall of the valve shaft (2), and the inner wall of the front valve shaft seat (4); a valve seat (9) is provided inside the valve body (1), and a rubber sealing ring (11) that cooperates with the valve seat is press-fitted onto the butterfly plate (3) by a pressure ring (10), characterized in that: The rubber seal ring (11) is composed of left and right rubber rings (111, 113) with L-shaped cross section and a steel ring (112) between the left and right rubber rings. When the left and right rubber rings are in sealing cooperation with the valve seat (9), an annular chamber (110) is formed between the end face of the valve seat (9), the opposite inner walls of the left and right rubber rings (111, 113) and the outer wall of the steel ring (112). The top and bottom of the valve body (1) are respectively provided with an upper drain hole (12) and a lower water injection hole (13) which pass through the valve seat (9) and are connected with the annular chamber (110). The upper and lower pipeline connecting joints (14, 15) are respectively arranged at the orifices of the valve body outer wall.

2. The leak-proof, soft-seal butterfly valve of claim 1, wherein: The annular packing space (8) is provided with a metal packing ring (16) which is sleeved on the outer wall of the valve shaft (2). The inner and outer walls of the front and rear parts of the metal packing ring are respectively provided with an inner side wall annular groove (17) and an outer side wall annular groove (18). The inner and outer side wall annular grooves are respectively provided with an inner side rubber seal ring (19) and an outer side rubber seal ring (20). The inner and outer walls of the middle part of the metal packing ring (16) are respectively provided with an inner annular middle groove (21) and an outer annular middle groove (22) with rectangular cross section. The middle part of the metal packing ring is provided with upper and lower radial packing through holes (23, 24) which pass through the inner and outer annular middle grooves. The front valve shaft seat (4) is provided with shaft seat upper and lower radial through holes (25, 26) which communicate with the upper and lower radial packing through holes (23, 24). The upper and lower radial through holes are respectively provided with an upper drain pipeline joint (27) and a lower water injection pipeline joint (28) at the orifices of the outer wall of the front valve shaft seat.

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