Combined sealing device

Abstract

The utility model belongs to the field of shield construction sealing, and discloses a combined sealing device which comprises an annular sealing component. The elastic sealing brushes are arranged on the circumferential inner wall of the annular sealing component; the air bag sealing assembly is arranged on the circumferential inner wall of the annular sealing component and matched with the elastic sealing brush for sealing, the air bag sealing assembly comprises an elastic sealing bag, an inflatable and deflatable air bag and a pressing and holding assembly, the elastic sealing bag comprises a bag part and a bag opening edge, the air bag is contained in the bag part, and the pressing and holding assembly is arranged on the bag opening edge. The edge of the bag opening is pressed and fixed to the inner wall of the annular sealing component through a pressing assembly. The sealing structure with multiple different sealing modes can be formed, the gap between the elastic sealing brush and the shield or tunnel pipe wall can be filled through the elastic characteristic of the inflated air bag sealing assembly, the better sealing effect is achieved, and then the length needed by the annular sealing component can be shortened.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the shield construction sealing technical field, concretely relates to a combined sealing device. BACKGROUND

[0002] With the large-scale promotion of urban rail transit in China, shield technology is becoming more and more mature and reliable, and a construction concept of being able to shield and receive in the shield industry has been formed, and the matching steel sleeve receiving technology has also been developed differently and is gradually being popularized. Using a steel sleeve to assist the shield in starting and receiving has higher reliability, convenience and economy compared with the traditional stratum reinforcement before starting and receiving the shield, so it will be more and more popular.

[0003] When the shield starts or receives, the steel sleeve or the extension sleeve is usually connected with the hole portal embedded steel ring, and the spring brush inside the steel sleeve is used for sealing during the starting or receiving process, but such a single sealing method also requires a longer length of the steel sleeve and more spring sealing brushes, and when the cement slurry enters the inside of the spring steel brush and needs to be used again, the steel brush is difficult to clean and has high cost. SUMMARY

[0004] Therefore, the utility model aims at providing a combined sealing device to solve the problems of single sealing structure and poor sealing performance of the existing sleeve.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme:

[0006] A combined sealing device comprises:

[0007] An annular sealing member;

[0008] A plurality of groups of elastic sealing brushes arranged on the circumferential inner wall of the annular sealing member; and

[0009] A gas bag sealing assembly arranged on the circumferential inner wall of the annular sealing member and cooperating with the elastic sealing brushes to seal, the gas bag sealing assembly comprises an elastic sealing bag, a gas bag capable of being inflated and deflated, and a pressing assembly, the elastic sealing bag comprises a bag portion and a bag opening edge, the gas bag is contained in the bag portion, and the bag opening edge is fixed in the inner wall of the annular sealing member by the pressing assembly.

[0010] In a possible implementation manner, the inner wall of the annular sealing member is provided with an installation groove in the circumferential direction, the bag opening edge of the elastic sealing bag is fixed in the installation groove by the pressing assembly, and when the gas bag sealing assembly is switched to the working state by inflating the gas bag, the elastic sealing bag protrudes into the installation groove in the direction of the inner side of the annular sealing member to seal.

[0011] In a possible implementation, the pressing assembly comprises a pressing block and a first fixing member, the first fixing member is arranged in the mounting groove and presses the bag opening edge of the elastic sealing bag, and the first fixing member fixes the pressing block in the mounting groove.

[0012] In a possible implementation, the pressing assembly further comprises an annular mounting plate arranged inside the annular sealing member, the annular mounting plate is connected to the pressing block, and the elastic sealing brush is mounted on the annular mounting plate.

[0013] In a possible implementation, the outer edge side of the bag opening edge, which is not pressed by the pressing assembly, is provided with a perforation, a limiting member is arranged in the perforation, and the limiting member forms a limiting relationship with the pressing assembly in a first direction axially parallel to the annular sealing member.

[0014] In a possible implementation, the inside of the annular sealing member is further provided with a blocking member for covering the air bag sealing assembly to block the free falling of the air bag sealing assembly to the inside, and the blocking member can be broken or opened by the air bag sealing assembly.

[0015] In a possible implementation, when the air bag is in a storage state in an uninflated state, the elastic sealing bag and the air bag inside the elastic sealing bag are both folded and stored in the mounting groove.

[0016] In a possible implementation, the blocking member is a spring brush, one end of the spring brush is connected to the inner wall of the annular sealing member or the pressing assembly, the other end is provided with a U-shaped clamping hole, and a fastener passes through the U-shaped clamping hole to form a clamping fit.

[0017] In a possible implementation, the elastic sealing brush is provided with a plurality of groups in the axial direction of the annular sealing member, and the air bag sealing assembly is arranged between each adjacent two groups of elastic sealing brushes.

[0018] In a possible implementation, the bag opening edges of the elastic sealing bags of the adjacent two groups of air bag sealing assemblies are integrally connected.

[0019] In a possible implementation, the elastic sealing brush is a spring steel plate brush composed of a plurality of layers of steel plates.

[0020] Compared with the prior art, the utility model has the following beneficial effects:

[0021] The utility model discloses a combined sealing device, through setting up the cooperation and sealing elastic sealing brush and air bag sealing assembly in annular sealing member inside, can form the sealing structure of multiple different sealing modes, also can fill up the gap between elastic sealing brush and shield or tunnel pipe wall through the elastic characteristic of air bag sealing assembly after inflation, realize better sealing effect, and then benefit shortening the length required for annular sealing member, and through the elastic sealing bag with bag -like mode containing air bag, it can protect air bag while with air bag inflation, and can provide greater inflation space and contain greater size air bag for air bag, and then realize better sealing effect.

[0022] And, through the pressing assembly can conveniently dismounting air bag sealing assembly, more convenient, and through the spring steel plate brush cooperation of air bag sealing assembly and multilayer steel plate superposition can reduce the cleaning difficulty and cost. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is a cross section structure schematic diagram of a combined sealing device;

[0024] Figure 2 It is a state schematic diagram of air bag sealing assembly of a combined sealing device in working condition;

[0025] Figure 3 It is a state schematic diagram of air bag sealing assembly of a combined sealing device in storage condition;

[0026] Figure 4 It is a structure schematic diagram of air bag sealing assembly of a combined sealing device when being limited through the limiting piece;

[0027] Figure 5 It is a principle schematic diagram of air bag sealing assembly of a combined sealing device when using spring brush as limiting piece;

[0028] Figure 6 It is Figure 5 It is the plan view of spring brush shown;

[0029] In the drawing: 1-annular sealing member;11-mounting groove;2-elastic sealing brush;3-air bag sealing assembly;31-elastic sealing bag;311-bag part;312-bag mouth edge;313-perforation;32-air bag;33-pressing assembly;331-pressing block;332-annular mounting plate;34-barrier;35-limiting piece;4-inflation pipeline;5-spring brush;51-U-shaped clamping hole. DETAILED DESCRIPTION

[0030] In order to make the technical personnel of the prior art better understand the technical scheme of the utility model, the utility model will be further explained in detail below in combination with specific implementation.

[0031] Please refer to Figures 1-3 As shown, an embodiment of this application provides a combined sealing device, including an annular sealing member 1, an elastic sealing brush 2, and an airbag sealing assembly 3.

[0032] The annular sealing component 1 is an annular structure used for receiving or launching the tunnel boring machine (TBM). Its inner cavity facilitates the TBM's passage through or installation of tunnel segments. In practical implementation, it can be used as a steel sleeve or transition ring, and its use as a pre-embedded steel ring is also possible. The elastic sealing brush 2 is an elastic sealing component located inside the annular sealing component 1. It can elastically press against the outer wall of the TBM or the outer wall of the tunnel segments for sealing. It can be a spring steel wire brush or a spring steel plate brush. The airbag sealing assembly 3 can further seal the tunnel, and together with the elastic sealing brush 2, it can achieve multiple sealing methods and multiple seals.

[0033] In the embodiments of this application, several groups of elastic sealing brushes 2 are arranged along the axial direction of the annular sealing member 1, with each group of elastic sealing brushes 2 arranged along the circumferential inner wall of the annular sealing member 1; several groups of airbag sealing components 3 are also arranged along the circumferential inner wall of the annular sealing member 1 to cooperate with the elastic sealing brushes 2 for sealing. When one group of elastic sealing brushes 2 is arranged along the axial direction of the annular sealing member 1, one or two groups of elastic sealing brushes 2 can be arranged and distributed on the end side of the elastic sealing brushes 2. When multiple groups of elastic sealing brushes 2 are arranged along the axial direction of the annular sealing member 1, multiple groups of elastic sealing brushes 2 can be arranged and distributed alternately with multiple groups of elastic sealing brushes 2 along the axial direction. Of course, it is not limited to other distribution methods and can be flexibly arranged according to actual needs.

[0034] The airbag sealing assembly 3 may include an elastic sealing bag 31, an inflatable airbag 32, and a pressure holding assembly 33. The elastic sealing bag 31 includes a bag portion 311 and a bag opening edge 312. The airbag 32 is housed within the bag portion 311. The bag opening edge 312 is pressed and fixed to the inner wall of the annular sealing member 1 by the pressure holding assembly 33.

[0035] The cross section of the elastic sealing bag 31 is a bag structure, but from the overall unfolded shape it can be seen as a belt-shaped component with a larger width in the axial direction, which can be in a bag structure after being fixed by the pressing assembly 33 at both ends, i.e. the bag opening edge 312. The bag part 311 of the bag structure can accommodate the air bag 32. After inflation, the elastic sealing bag 31 can be expanded with the air bag 32 to achieve better sealing. The greater the internal air pressure, the greater the pressure of the elastic sealing bag 31. The elastic sealing bag 31 and the elastic sealing brush 2 can work together to achieve better sealing. The use of the elastic sealing brush 2 alone cannot achieve good sealing. The use of the elastic sealing bag 31 can shorten the length of the annular sealing member 1, making it easier to receive or start the shield. The bag structure can accommodate the air bag 32, which can be sealed by a larger air bag 32. The use of the elastic sealing bag 31 can avoid the use of fasteners to fix or connect the air bag 32, which can cause the air bag 32 to break easily. It can be understood that the air bag sealing assembly 3 can also press the elastic sealing brush 2 when it is inflated and pressed against the tunnel segment or the shield. This can increase the pressure of the elastic sealing brush 2 and make it easier to seal the gap between the sleeve annular sealing member 1 and the tunnel segment or the shield. The elastic sealing bag 31 can move during the sealing process and can be better sealed due to its wear-resistant properties.

[0036] The above technical solution can be used to set the elastic sealing brush 2 and the air bag sealing assembly 3 inside the annular sealing member 1. The elastic sealing brush 2 and the air bag sealing assembly 3 can form a sealing structure with multiple different sealing methods. The air bag sealing assembly 3 can fill the gap between the elastic sealing brush 2 and the shield or the tunnel wall after inflation, which can achieve better sealing. This can shorten the length of the annular sealing member 1. The elastic sealing bag 31 can accommodate the air bag 32 in a bag-like manner, which can protect the air bag 32 and provide more space for the air bag 32 to expand. This can achieve better sealing.

[0037] In an embodiment, the inner wall of the annular sealing member 1 is provided with an installation groove 11 in the circumferential direction. The bag opening edge 312 of the elastic sealing bag 31 is fixed by the pressing assembly 33 in the installation groove 11. When the air bag sealing assembly 3 is inflated by the air bag 32 and switched to the working state, the elastic sealing bag 31 expands with the air bag 32 and protrudes into the installation groove 11 to seal the inside of the annular sealing member 1.

[0038] In this embodiment, the air bag sealing assembly 3 is installed in the mounting groove 11 on the inner wall of the annular sealing member 1 by the pressing assembly 33. The mounting groove 11 can reduce the protruding size of the air bag sealing assembly 3 inwardly and facilitate the installation of a larger size air bag sealing assembly 3. Of course, in the embodiment without installation, a relatively smaller size air bag sealing assembly 3 can also be installed. The air bag sealing assembly 3 deforms by the inflation and deflation of the air bag 32, that is, the air bag sealing assembly 3 can have a working state, in which the air bag sealing assembly 3 protrudes out of the mounting groove 11 and is tightly sealed on the outer wall of the shield or the tunnel segment. At this time, there is a large pressure inside, and the sealing is performed in this state. On the contrary, in the non-working state, the sealing is not performed, and the air bag sealing assembly 3 is accommodated in the mounting groove 11.

[0039] In a preferred embodiment of the pressing assembly 33, the pressing assembly 33 includes a pressing block 331 and a first fixing member (not shown in the figure), which is arranged in the mounting groove 11 and presses the bag opening edge 312 of the elastic sealing bag 31. The first fixing member fixes the pressing block 331 in the mounting groove 11.

[0040] The pressing assembly 33 is provided with a set of pressing blocks 331 on both sides of the bag opening edge 312 of the elastic sealing bag 31, which are used to press the bag opening edge 312 of the elastic sealing bag 31 to prevent the bag opening edge 312 from being pulled out when the air bag 32 expands. The first fixing member such as a bolt fastener can make the pressing block 331 have a pressing force and stably fix the pressing block 331 in the mounting groove 11 for pressing. Such an installation structure can facilitate the replacement of the air bag sealing assembly 3 and is convenient for use and maintenance.

[0041] On this basis, in order to facilitate the installation and mutual connection of the elastic sealing brush 2, the pressing assembly 33 further includes an annular mounting plate 332 arranged on the inner side of the annular sealing member 1, which is connected to the pressing block 331 and on which the elastic sealing brush 2 is installed. In this way, the annular mounting plate 332 is mainly arranged on the pressing block 331, which facilitates the connection and installation of the elastic sealing brush 2 with the air bag sealing assembly 3 and is more conducive to effective sealing and improves the sealing cooperation between them.

[0042] Specifically, the first fixing member can adopt a counterbore structure for installation, so as to facilitate the installation of the annular mounting plate 332 on the pressing block 331.

[0043] In order to better prevent the bag opening edge 312 of the elastic sealing bag 31 from being pulled out of the pressing of the pressing block 331 by a larger pressure, further, Figure 4As shown, the outer side of the bag opening edge 312 not being pressed by the pressing assembly 33 is provided with a through hole 313, and a limiting piece 35 is arranged in the through hole 313, and the limiting piece 35 and the pressing assembly 33 form a limiting relationship in the first direction axially parallel to the annular sealing member 1.

[0044] In this way, by the limiting piece 35 such as a limiting rod passing through the through hole 313 of the bag opening edge 312, the bag opening edge 312 is limited by the limiting relationship between the limiting piece 35 and the pressing block 331 when the air bag 32 is inflated, so that an opposite resistance can be provided to the bag opening edge 312, thereby better avoiding the bag opening edge 312 being pulled off by the air bag 32, and the structure is more stable.

[0045] In the specific implementation process, the elastic sealing bag 31 can be made of elastic fiber material. The elastic sealing bag 31 made of elastic fiber material can have good elasticity and be inflated under the inflation of the air bag 32, and can have good wear resistance by using materials such as polyolefin fiber, nylon fiber or polyester fiber, so that it can be pressed on the surface of the shield or the surface of the tunnel segment for sealing. Such fiber is soft and has good tensile strength, is convenient to install, and has low requirement on installation space. The elastic sealing bag 31 can be made on site, has high strength, and the pressure of the air bag 32 can be adjusted to be higher, so that the sealing capacity of the whole shield receiving or launching system is also stronger.

[0046] In order to better accommodate the air bag sealing assembly 3 in the non-working state, in the embodiment of the present application, the inner side of the annular sealing member 1 is further provided with a blocking piece 34 covering the air bag sealing assembly 3 to block it from freely falling inward, and the blocking piece 34 can be broken or opened by the air bag sealing assembly 3.

[0047] The air bag sealing assembly 3 can be blocked in the installation groove 11 by the blocking of the blocking piece 34 in the non-working state, so that the shield can pass better and the construction is facilitated. Specifically, the blocking piece 34 is preferably made of rubber material with relatively thin thickness, and the two ends of the blocking piece 34 can be fixed on the pressing block 331 or the annular mounting plate 332 by fasteners such as bolts. When the blocking piece 34 is configured to be opened by the air bag sealing assembly 3, one end of the two ends is simply fixed, such as fixed by a bolt, so that the blocking piece 34 can be broken and opened when the air bag 32 is inflated. When the blocking piece 34 is configured to be broken by the air bag sealing assembly 3, the thickness of the blocking piece 34 is relatively thin, so that the blocking piece 34 can be broken by the inflation of the air bag sealing assembly 3. At this time, the air bag sealing assembly 3 can break out and be pressed on the outer wall of the shield or the tunnel segment.

[0048] In the specific implementation process, the elastic sealing bag 31 can be made of elastic fiber material. The elastic sealing bag 31 made of elastic fiber material can have good elasticity and be inflated under the inflation of the air bag 32, and can have good wear resistance by using materials such as polyolefin fiber, nylon fiber or polyester fiber, so that it can be pressed on the surface of the shield or the surface of the tunnel segment for sealing. Such fiber is soft and has good tensile strength, is convenient to install, and has low requirement on installation space. The elastic sealing bag 31 can be made on site, has high strength, and the pressure of the air bag 32 can be adjusted to be higher, so that the sealing capacity of the whole shield receiving or launching system is also stronger. Figure 5 and Figure 6As shown, the blocking piece 34 is a spring brush 5, one end of the spring brush 5 is connected to the inner wall of the annular sealing member 1 or the pressing assembly 33, and the other end is provided with a U-shaped clamping hole 51 and is clamped by a fastener passing through the U-shaped clamping hole 51. The blocking piece 34 is made of a spring brush 5, one end of the spring brush 5 is fixed to the pressing assembly 33 or the inner wall of the annular sealing member 1, and the other end can be provided with a U-shaped clamping hole 51. The end provided with the U-shaped clamping hole 51 can be clamped and fixed by a bolt or the like, and when the air bag sealing assembly 3 expands, the end provided with the U-shaped clamping hole 51 of the blocking piece can break free from the fixing of the fastener under a large pressure, thereby being opened by the air bag sealing assembly 3, and the spring brush 5 is also pressed against the shield outer wall or the tunnel segment outer wall to play a sealing role. The spring brush 5 has the following effects: first, when the air bag sealing assembly is not popped out, it protects the air bag from being damaged; second, when the air bag sealing assembly is popped out, it can block the air bag and limit the air bag to a certain position; and third, it is pressed against the segment or the shield shell by the air bag sealing assembly to form a combined seal with the air bag sealing assembly.

[0049] Further, when the air bag 32 is in a non-inflated storage state, the elastic sealing bag 31 and the air bag 32 in it are all folded and stored in the mounting groove 11.

[0050] In this way, the folded elastic sealing bag 31 and air bag 32 can reduce the volume and space occupation, thereby facilitating the arrangement of a larger size air bag sealing assembly 3. In the specific implementation process, the elastic sealing bag and the air bag 32 in it can be folded in a wavy concave-convex structure, so that a larger size air bag sealing assembly 3 can be stored.

[0051] In the specific implementation process, the elastic sealing brush 2 is provided in multiple groups along the axial direction of the annular sealing member 1, and the air bag sealing assembly 3 is arranged between every two adjacent groups of elastic sealing brushes 2. In this way, the air bag sealing assembly 3 arranged between every two adjacent groups of elastic sealing brushes 2 can form a better sealing fit.

[0052] At the same time, the bag opening edges 312 of the elastic sealing bags 31 of the adjacent two groups of air bag sealing assemblies 3 are integrally connected. By integrally connecting the bag opening edges 312 of the elastic sealing bags 31 of the adjacent two groups of air bag sealing assemblies 3, multiple groups of air bag sealing assemblies 3 can share the elastic outer layer part, that is, a whole piece of belt-shaped part with a large width in the axial direction is formed in a ring shape from the overall unfolded form, and a plurality of elastic sealing air bags 32 are arranged in the axial direction by being concave inward at positions corresponding to each group of air bag sealing assemblies 3, and the adjacent bag opening edges 312 are integrally structured. In this way, the installation of multiple groups of air bag sealing assemblies 3 can be facilitated, and the cost can be reduced.

[0053] In addition, the elastic sealing brush 2 is preferably a spring steel plate brush with multiple layers of steel plates superimposed. In the prior art, a steel wire brush is used to seal the sleeve or the extended steel ring. However, the steel wire brush consumes a lot of tail brushes, and it is difficult to clean the steel wire brush after the cement slurry enters the inside of the steel wire brush. After the spring steel plate brush with multiple layers of steel plates superimposed and the air bag 32 are combined to seal, the spring steel plate brush can be easily cleaned, and the sealing effect is better.

[0054] Specifically, the air bag 32 is inflated or deflated through the air inlet and outlet of the air nozzle. The air nozzle is connected with an external pressurizing device through the inflation pipeline 4. The pressurizing device is in communication with the air bag 32 through the inflation pipeline 4. The pipeline is configured to extend outward through the annular sealing member 1 and be connected with the pressurizing device such as an air pump.

[0055] It should be noted that:

[0056] 1. The elastic sealing brush 2 in the text is composed of multiple layers of spring steel plates superimposed, which can limit the elastic sealing bag 31 between the two rows of spring sealing brushes 2, increase the contact area between the elastic sealing bag 31 and the tunnel segment or the shield shell, and enhance the sealing capacity of the combined sealing; at the same time, the multiple layers (such as 10 layers) of spring steel plate brushes are pressed and attached to the surface of the segment or the shield, and the spring steel plate brush itself also has a certain sealing capacity.

[0057] 2. The sealing structure of the air bag 32 and the elastic sealing bag 31 can also be used alone to complete the launching and receiving of the shield. When sealing is required, the air bag 32 is popped out to press and attach the elastic sealing bag 31 to the surface of the shield or the segment. One or more circles of air bags 32 and elastic sealing bags 31 can be arranged on the inner periphery of the annular sealing member 1 according to requirements.

[0058] 3. The annular sealing structure 1 can be a steel sleeve, a transition ring or a pre-embedded steel ring.

[0059] 4. The elastic sealing bag 31 can be made of a single material or a mixed material such as polyolefin fiber, nylon fiber, hemp fiber, glass fiber, polyester fiber, polyurethane, rubber products or rubber conveyor belt, and is not limited.

[0060] The above is only a preferred embodiment of the present application, and it should be pointed out that the above preferred embodiment should not be regarded as a limitation of the present application. The protection scope of the present application should be limited by the scope defined in the claims. For ordinary skilled persons in the technical field, some improvements and refinements can be made without departing from the spirit and scope of the present application, and these improvements and refinements should also be regarded as the protection scope of the present application.​

Claims

1. A combination seal apparatus, characterized by, The application relates to a sealing device for a rotary valve, comprising: a ring-shaped sealing member (1); a plurality of groups of elastic sealing brushes (2) arranged on the inner circumferential wall of the ring-shaped sealing member (1); and a gas bag sealing assembly (3) arranged on the inner circumferential wall of the ring-shaped sealing member (1) and matched with the elastic sealing brushes (2) for sealing, the gas bag sealing assembly (3) comprising an elastic sealing bag (31), a gas bag (32) capable of being inflated and deflated, and a pressing assembly (33), the elastic sealing bag (31) comprising a bag portion (311) and a bag opening edge (312), the gas bag (32) being contained in the bag portion (311), and the bag opening edge (312) being fixedly pressed on the inner wall of the ring-shaped sealing member (1) by the pressing assembly (33).

2. A combination seal as claimed in claim 1, wherein The inner wall of the ring-shaped sealing member (1) is provided with an installation groove (11) in the circumferential direction, the bag opening edge (312) of the elastic sealing bag (31) is fixedly pressed in the installation groove (11) by the pressing assembly (33), and when the gas bag sealing assembly (3) is switched to the working state by inflating the gas bag (32), the elastic sealing bag (31) protrudes out of the installation groove (11) to the inner side of the ring-shaped sealing member (1) for sealing along with the expansion of the gas bag (32).

3. A combination seal as claimed in claim 2, wherein The pressing assembly (33) comprises a pressing block (331) and a first fixing member, the first fixing member is arranged in the installation groove (11) and presses the bag opening edge (312) of the elastic sealing bag (31), and the first fixing member fixes the pressing block (331) in the installation groove (11).

4. A combination seal as claimed in claim 3, wherein The pressing assembly (33) further comprises a ring-shaped mounting plate (332) arranged on the inner side of the ring-shaped sealing member (1), the ring-shaped mounting plate (332) is connected to the pressing block (331), and the elastic sealing brush (2) is mounted on the ring-shaped mounting plate (332).

5. A combination seal as defined in claim 1, wherein, The outer side of the bag opening edge (312) which is not pressed by the pressing assembly (33) is provided with a perforation (313), the perforation (313) is provided with a limiting member (35), and the limiting member (35) forms a limiting relationship with the pressing assembly (33) in a first direction which is parallel to the axial direction of the ring-shaped sealing member (1).

6. A combination seal as defined in claim 1, wherein, The inner side of the ring-shaped sealing member (1) is further provided with a blocking member (34) for covering the gas bag sealing assembly (3) to prevent it from freely falling to the inner side, and the blocking member (34) can be broken or opened by the gas bag sealing assembly (3).

7. A combined seal as claimed in claim 6, wherein When the gas bag (32) is in the storage state of being not inflated, the elastic sealing bag (31) and the gas bag (32) in the elastic sealing bag (31) are both in a folded storage state in the installation groove (11).

8. A combination seal as claimed in claim 6, wherein The blocking member (34) is a spring brush (5), one end of the spring brush (5) is connected to the inner wall of the ring-shaped sealing member (1) or the pressing assembly (33), the other end is provided with a U-shaped clamping hole (51), and a fastener passes through the U-shaped clamping hole (51) to form clamping cooperation.

9. A combination seal as defined in claim 1, wherein, The elastic sealing brushes (2) are arranged in multiple groups along the axial direction of the ring-shaped sealing member (1), and the gas bag sealing assembly (3) is arranged between every two adjacent groups of the elastic sealing brushes (2).

10. A combination seal as claimed in claim 9, wherein The bag opening edges (312) of the elastic sealing bags (31) of the adjacent two groups of the gas bag sealing assemblies (3) are integrally connected.

Images