TWI404877B - Airbag leakproof device - Google Patents

Abstract

A bladder type leak-resistant device is sleeved on a rotary shaft of a mechanical device and fastened between a device chamber of the mechanical device and a leak-proofing component. The bladder type leak-resistant device includes at least a fastening seat fastened on the device chamber and formed with an external injection air aperture and at least an annular bladder located in the fastening seat. The bladder is elastic and embedded on the fastening seat. The bladder moves reciprocally between an expansion position and a deflated position. Thus, the bladder will press against the rotary shaft when being inflated, thereby achieving an effect of preventing process fluid of the device chamber from leaking. As a result, when dismounting the leak-proofing component, the process fluid in the device chamber will be isolated by the bladder and will not leak.

Description

Airbag type leakproof device

The invention relates to a leakage preventing device, in particular to a balloon type leakage preventing device which is mounted on a rotating shaft of a mechanical device and is located between a device cavity and a leakage preventing device.

The mechanical design of the general agitation mechanical device is characterized in that a transmission mechanism is pivoted on the device cavity, the transmission mechanism has a rotating shaft extending in the device cavity, a blade wheel locked at the end of the rotating shaft, and a A power device capable of rotating the rotating shaft, wherein the rotating shaft is rotated by the power device, so that the blade wheel can perform a stirring action on the process fluid in the equipment cavity.

Referring to FIG. 1, since the process fluid in the apparatus chamber 12 may be toxic and the pressure is generated in the apparatus chamber 12 during agitation, the opening of the rotating shaft 11 adjacent to the apparatus chamber 12 is provided. A leak-proof mechanism 13 is typically provided to prevent process fluid within the equipment chamber 12 from seeping out of the pivot with pressure.

In long-term use, the process fluid in the equipment cavity 12 may adhere to the leakage preventing member 13 and affect the sealing effect of the leakage preventing member 13, so that the leakage preventing member 13 needs to be periodically removed for cleaning and maintenance. However, during the disassembly process, the process fluid in the device cavity 12 may flow out. If the process fluid in the device cavity 12 is toxic, it may cause pollution or even endanger the safety of maintenance personnel, and thus is inconvenient in operation.

Accordingly, it is an object of the present invention to provide a bladder type leak preventer that prevents leakage of process fluids during maintenance and disassembly of mechanical equipment.

Therefore, the airbag type leakage preventing device of the present invention is sleeved on a rotating shaft of a mechanical device and is locked between the device cavity of the mechanical device and the leakage preventing device, and the airbag type leakage preventing device comprises: at least one The fixing seat defines a process side, and an atmosphere side opposite to the process side, the fixing seat is a ring sleeve and includes at least one outer gas injection hole, and at least one positioning groove, wherein the process side is against a device cavity, wherein the atmospheric side is against the leakage preventing member; and at least one annular air bag is elastically embedded in the fixing seat and located between the fixing seat and the rotating shaft, The air bag includes a base wall, two side walls respectively bent by the side edges of the base wall, at least one positioning portion formed on a top edge of one of the side walls, and a wall portion defined by the base wall and the side wall An plenum of the outer venting hole, the positioning portion is embedded in the positioning groove of the fixing seat, wherein the base wall is reciprocable relative to the two side walls between an expanded position and a deflated position; and the air bag is inflated Gas The outer injection holes injected through expanding the airbag inflator of the inner space, and the base wall is moved to the expanded position and against the top of the rotating shaft, to be excluded gas, the base wall will return to the deflated position.

The effect of the invention is that when the airbag is inflated, the base wall will abut against the rotating shaft, so that when the leakage preventing mechanism is disassembled, the process fluid in the equipment cavity is blocked by the airbag without There is a leak.

The above and other technical contents, features and advantages of the present invention will be apparent from the following detailed description of the preferred embodiments of the invention.

Before the present invention is described in detail, it is noted that in the following description, similar elements are denoted by the same reference numerals.

Referring to FIG. 2, a first preferred embodiment of the airbag type leakage preventing device of the present invention is sleeved on a rotating shaft 11 of a mechanical device, and is locked to the device cavity 12 and the leakage preventing member 13 of the mechanical device. The airbag type leakage preventing device comprises a fixing seat 2 sleeved on the rotating shaft 11, an annular air bag 3 located between the rotating shaft 11 and the fixing base 2, and a ring airbag 3 disposed on the fixing base 2 A sealing element 4 with the device cavity 12. The leakage preventing member 13 may be a leakage preventing member such as an oil seal, a packing, a shaft seal, a bearing or the like.

The fixing base 2 defines a process side A and an atmosphere side B opposite to the process side A. The fixing seat 2 is sleeved on the rotating shaft 11 and includes an outer gas injection hole 21, two positioning grooves 22, and a a fixing hole 23 for a locking member 14 for locking the fixing base 2 to the device cavity 12, wherein the process side A is abutting against the device cavity 12, and the atmosphere side B is against the leakage preventing member 13. The number of the locking member 14 and the fixing hole 23 can be adjusted according to actual conditions, and is not limited thereto.

Referring to FIG. 2 and FIG. 3 , the airbag 3 has elasticity and is embedded in the fixing base 2 . The airbag 3 includes a base wall 31 , two side walls 32 respectively bent by the two side edges of the base wall 31 , and two Positioning portions 33 respectively formed on the top edges of the two side walls 32, three ribs 34 formed on the surface of the base wall 31 and facing the rotating shaft 11, and a boundary portion defined by the base wall 31 and the side wall 32 In the inflating space 35 of the outer air injection hole 21, the two positioning portions 33 are respectively embedded in the two positioning grooves 22 of the fixing base 2.

It should be particularly noted that, in this embodiment, each positioning portion 33 of the airbag 3 is a flange that is bent outwardly from the top edge of each side wall 32, and is positioned by the flange of the flange. The shape of the positioning portion 33 is only one embodiment, and can be easily replaced by those skilled in the art, and is not limited thereto. The number of the ribs 34 can also be increased or decreased depending on the actual production situation, and is not limited thereto.

Referring to FIGS. 2 and 4, the base wall 31 is reciprocable relative to the two side walls 32 between an expanded position (FIG. 4) and a deflated position (FIG. 2); as shown in FIG. When inflated, gas is injected into the inflating space 35 through the outer injecting hole 21 to expand the air bag 3, and the base wall 31 is moved to the expanded position, so that the protruding rib 34 is abutted against the rotating shaft 11. After the gas is removed, the base wall 31 returns to the deflated position as shown in FIG.

It should be noted that the thickness of the base wall 31 is such that the thickness of the base wall 31 is thin and the side edges are thin, that is, the thickness of the boundary between the base wall 31 and the two side walls 32 is relatively thin, so that the base wall 31 is opposite. It is easier to move the two side walls 32, while the centrally thick form provides better strength of the base wall 31.

With the above design, when the leakage preventing member 13 needs to be disassembled for cleaning and maintenance, as long as the gas is continuously supplied from the outer air injection hole 21, the air bag 3 can be inflated to allow the rib 34 to abut the same. Rotating the shaft 11 and blocking the device cavity 12 can avoid leakage of the process fluid in the device cavity 12; further, the air bag type leakage preventing device is of a cassette type design, and is easy to disassemble or assemble.

Referring to FIG. 5, a second preferred embodiment of the airbag type leakage preventing device of the present invention is substantially similar to the first preferred embodiment described above, except that the fixing base 2 further includes abutting against the device cavity 12. a first body 24, a second body 25 against the leakage preventing member 13, and a positioning ring 26 sandwiched between the first and second bodies 24, 25 and fixing the air bag 3, the two The positioning groove 22 is formed on the first and second bodies 24 and 25 respectively. In the embodiment, the outer gas injection hole 21 and the fixing hole 23 are formed on the second body 25, of course, the outer gas injection hole 21 and the fixing hole. 23 can also be formed on the first body 24 according to the actual manufacturing situation, and is not limited thereto.

The positioning ring 26 has an inner gas injection hole 261 communicating with the outer gas injection hole 21, and a pressing portion 262 for pressing the air bag 3. In the embodiment, the pressing portion 262 is laterally pressed against the side wall 32 of the air bag 3. The airbag 3 is stably positioned, and when the airbag 3 is inflated, the gas moves through the outer air injection hole 21 and the inner air injection hole 261 to move the base wall 31 to the expansion position.

With the above design, in addition to the leakage of the process fluid in the device cavity 12 as in the first preferred embodiment, when a large pressure is generated in the device cavity 12, the positioning is transmitted through the positioning. The ring 26 is used to more stably press and position the airbag 3, and the effect of blocking the airbag 3 can be effectively improved, and the applicable range of the airbag type leakage preventing device is also improved.

In summary, when the airbag 3 is inflated, the ribs 34 on the base wall 31 are erected against the rotating shaft 11 so that the residual process in the equipment cavity 12 is removed when the leakage preventing member 13 is detached. Since the fluid is blocked by the airbag 3 without leakage, the object of the present invention can be achieved.

The above is only the preferred embodiment of the present invention, and the scope of the invention is not limited thereto, that is, the simple equivalent changes and modifications made by the scope of the invention and the description of the invention are All remain within the scope of the invention patent.

11. . . Rotary axis

12. . . Equipment cavity

13. . . Leakproof parts

14. . . Locking piece

2. . . Fixed seat

twenty one. . . External injection hole

twenty two. . . Positioning slot

twenty three. . . Fixed hole

twenty four. . . First ontology

25. . . Second ontology

26. . . Locating ring

261. . . Internal injection hole

262. . . Pressing department

3. . . Airbag

31. . . Base wall

32. . . Side wall

33. . . Positioning department

34. . . Rib

35. . . Inflatable space

A. . . Process side

B. . . Atmospheric side

4. . . Sealing element

Figure 1 is a cross-sectional view showing a conventional leakage preventing mechanism disposed between an opening of a device cavity and the rotating shaft;

Figure 2 is a cross-sectional view showing a first preferred embodiment of the airbag type leakage preventing device of the present invention;

Figure 3 is a perspective cross-sectional view showing the overall configuration of the airbag in the first preferred embodiment;

Figure 4 is a cross-sectional view showing the airbag in an expanded position in the first preferred embodiment; and

Figure 5 is a cross-sectional view showing a second preferred embodiment of the air bag type leakage preventing device of the present invention.

11. . . Rotary axis

12. . . Equipment cavity

13. . . Leakproof parts

14. . . Locking piece

2. . . Fixed seat

twenty one. . . External injection hole

twenty two. . . Positioning slot

twenty three. . . Fixed hole

3. . . Airbag

31. . . Base wall

32. . . Side wall

33. . . Positioning department

34. . . Rib

35. . . Inflatable space

A. . . Process side

B. . . Atmospheric side

4. . . Sealing element

Claims (18)

An airbag type leakage preventing device is disposed on a rotating shaft of a mechanical device and is locked between a device cavity of the mechanical device and a leakage preventing device, and the airbag type leakage preventing device comprises: at least one fixed The seat is defined as a process side, and an atmosphere side opposite to the process side, the fixing seat is fixed on the rotating shaft and includes at least one outer gas injection hole, and at least one positioning groove, wherein the process side is abutted In the device cavity, the atmosphere side is against the leakage preventing mechanism; and at least one annular air bag is elastically embedded in the fixing seat and located between the fixing seat and the rotating shaft. The air bag includes a base wall, two side walls respectively bent by the side edges of the base wall, at least one positioning portion formed on a top edge of one of the side walls, and a wall portion defined by the base wall and the side wall An accommodating space of the outer venting hole, the positioning portion is embedded in the positioning groove of the fixing seat, wherein the base wall is reciprocable relative to the two side walls between an expanded position and a deflated position; When the airbag is inflated, the air Is injected through the injection hole so that the outer balloon is inflated within the plenum, and the base wall is moved to the expanded position and against the top of the rotating shaft, to be excluded gas, the base wall will return to the deflated position. The airbag type leakage preventing device according to claim 1, wherein the airbag further includes at least one rib formed on a surface of the base wall facing the rotating shaft, and when the airbag is inflated to expand the airbag, The rib is abutted against the rotating shaft. The airbag type leakage preventing device according to the first or second aspect of the invention, wherein the thickness of the base wall is such that the thickness of the base wall is thick and the side edges are thin. The airbag type leakage preventing device according to claim 3, wherein the positioning portion of the airbag is a flange which is bent outwardly from a top edge of one of the side walls. The airbag type leakage preventing device according to claim 1, wherein the fixing base further comprises at least one fixing hole for the at least one locking member to extend to lock the fixing seat to the device cavity. The airbag type leakage preventing device according to claim 1, wherein the fixing base comprises two positioning grooves, and the air bag has two positioning portions respectively formed on the top edges of the two side walls, wherein the positioning portions are respectively Embedded in the positioning slot. The airbag type leakage preventing device according to claim 5, wherein the fixing base comprises two positioning grooves, and the air bag has two positioning portions respectively formed on the top edges of the two side walls, the positioning portions are respectively Embedded in the positioning slot. The airbag type leakage preventing device according to claim 7, wherein the fixing base further comprises a first body that abuts against the cavity of the device, and a second body that abuts against the leakage preventing mechanism . The airbag type leakage preventing device according to claim 8, wherein the two positioning grooves are respectively formed on the first and second bodies. According to the airbag type leakage preventing device of claim 8, the outer air injection hole is formed on the first body. According to the airbag type leakage preventing device of claim 8, the outer air injection hole is formed on the second body. The airbag type leakage preventing device according to claim 8, wherein the fixing base further comprises a positioning ring sandwiched between the first and second bodies and fixing the air bag. The air bag type leakage preventing device according to claim 12, wherein the positioning ring has at least one inner air injection hole connected to the outer air injection hole, and when the air bag is inflated, the gas is made through the outer air injection hole and the inner air injection hole. The balloon is inflated. The airbag type leakage preventing device according to claim 12, wherein the positioning ring has a pressing portion for pressing the air bag. According to the airbag type leakage preventing device of the first aspect of the patent application, the airbag type leakage preventing device is integrally formed with the leakage preventing member of the mechanical device. The airbag type leakage preventing device according to claim 1, further comprising at least one sealing member disposed between the process side of the fixing seat and the device cavity. According to the airbag type leakage preventing device of claim 8, the fixing hole is formed on the first body. According to the airbag type leakage preventing device of claim 8, the fixing hole is formed on the second body.