CN218935590U - Labyrinth seal pipeline and air source heat pump unit - Google Patents

Abstract

The utility model belongs to the technical field of pipeline sealing, and particularly provides a labyrinth seal pipeline and an air source heat pump unit. The labyrinth seal pipeline comprises a pipeline shell and a flange plate which is connected to the pipeline shell in a matched mode, wherein a first clamping rib is arranged on a matching surface of the pipeline shell, a second clamping rib is arranged on a matching surface of the flange plate, and the first clamping rib is in contact fit with the second clamping rib to form a labyrinth seal structure; the flexible sealing glue layer is formed by solidifying the flexible sealing glue filled between the matching surfaces of the pipeline shell and the flange plate, and the problem of poor sealing performance of the traditional pipeline is solved.

Description

Labyrinth seal pipeline and air source heat pump unit

Technical Field

The utility model belongs to the technical field of pipeline sealing, and particularly provides a labyrinth seal pipeline and an air source heat pump unit.

Background

At present, the scenes of heating by adopting the air source heat pump units are more and more diversified, but the air source heat pump units can leak due to vibration in the working process.

In the prior art, the structure that the pipeline shell and the flange plate are connected is generally adopted for sealing the pipeline of the air source heat pump, a flange pad is firstly placed between the flange plate and the pipeline shell during connection, and finally the flange plate and the pipeline shell are tightly pressed by bolts so as to be tightly combined together, so that the sealing effect is achieved. However, the flange pad between the shell and the flange plate is worn due to vibration of the pipeline, and the flange pad is aged after long-time use, so that the wear of the flange pad is more serious, and the sealing performance of the pipeline is deteriorated.

Accordingly, there is a need in the art for a new solution to the above-mentioned problems.

Disclosure of Invention

In order to solve the above-mentioned problems in the prior art, that is, to solve the problem of poor sealing property of the pipe structure in the prior art.

To this end, a first aspect of the present utility model provides a labyrinth seal pipe, where the labyrinth seal pipe includes a pipe casing and a flange plate cooperatively connected to the pipe casing, a first clamping rib is disposed on a mating surface of the pipe casing, a second clamping rib is disposed on a mating surface of the flange plate, and the first clamping rib is in contact fit with the second clamping rib and forms a labyrinth seal structure; the flexible sealing glue layer is formed by solidifying the flexible sealing glue filled between the matching surfaces of the pipeline shell and the flange plate.

Under the condition of adopting the technical scheme, the first clamping ribs and the second clamping ribs which are in contact fit with each other are arranged on the matching surfaces of the pipeline shell and the flange plate, and a labyrinth seal structure is formed when the first clamping ribs and the second clamping ribs are in contact fit, so that the sealing performance of the pipeline is enhanced, and further, a flexible sealing adhesive layer is filled between the matching surfaces of the pipeline shell and the flange plate, so that the gap between the matching surfaces of the pipeline shell and the flange plate is eliminated, and the flexible sealing adhesive layer can be combined with the labyrinth seal structure formed by the first clamping ribs and the second clamping ribs, so that the sealing performance of the pipeline structure is further enhanced.

In the specific embodiment of the labyrinth seal pipe, the first clamping ribs and the second clamping ribs are annular clamping ribs, the first clamping ribs and the pipe shell are arranged concentrically, and the second clamping ribs and the flange plate are arranged concentrically.

Under the condition of adopting the technical scheme, the first clamping ribs and the second clamping ribs are annular clamping ribs, and when the pipeline shell and the flange plate are matched together, the first clamping ribs and the second clamping ribs form an annular labyrinth sealing structure, so that the sealing performance of the pipeline sealing structure is improved.

In the specific embodiment of the labyrinth seal pipe, the first clamping rib is a shell and/or a groove arranged on the matching surface of the pipe shell, the second clamping rib is a flange protrusion and/or a flange groove arranged on the matching surface of the flange plate, and the cross section of the contact surface of the first clamping rib and the second clamping rib is L-shaped, Z-shaped or S-shaped.

In the specific embodiment of the labyrinth seal pipe, the flange plate is provided with the flange groove and the flange bulge at the same time, and the flange groove and the flange bulge are alternately arranged in sequence; the pipeline shell is simultaneously provided with the shell protrusions and the shell grooves, and the shell protrusions and the shell grooves are alternately arranged in sequence.

In the specific embodiment of the labyrinth seal pipe, a first space is formed between the flange groove and the flange protrusion, a second space is formed between the housing protrusion and the housing groove, and the first space is equal to the second space.

Under the condition of adopting the technical scheme, the interval is arranged between the groove and the bulge, the distance between the groove and the bulge is increased, the strength of the groove and the bulge is improved, and then the stability between the groove and the bulge is improved.

In a specific embodiment of the above pipe sealing structure, the flange plate is connected with the pipe casing through bolts.

In a specific embodiment of the above labyrinth seal pipe, the labyrinth seal pipe further includes: the cavity is arranged on the matching surface of the flange plate and the pipeline shell, and a sealing cavity is formed by the cavity through the flexible sealing adhesive layer and the matching surface.

Under the condition of adopting the technical scheme, the sealing cavities are formed by the cavities arranged on the matching surfaces of the flange plate and the pipeline shell and the flexible sealing adhesive layer arranged on the matching surfaces, and the sealing cavity is formed by extruding the liquid in the shell outside the sealing cavity, so that the sealing performance of the labyrinth sealing pipeline is improved.

In the specific embodiment of the labyrinth seal pipe, the plurality of cavities are distributed on the matching surfaces of the flange plate and the pipe shell in a circular shape.

In a specific embodiment of the labyrinth seal pipe, the flexible sealant layer is formed by curing a water-swellable flexible sealant.

Under the condition of adopting the technical scheme, the flexible sealing glue layer is formed by solidifying the water-swelling sealing glue layer, so that the flexible sealing glue layer swells due to water, the matching surface of the pipeline shell and the flange plate is connected more tightly, and the sealing performance of the pipeline sealing structure is further improved.

The utility model further provides an air source heat pump unit pipe, and the air source heat pump unit adopts the labyrinth seal pipeline in the embodiment.

Drawings

Preferred embodiments of the present utility model are described below with reference to the accompanying drawings, in which:

fig. 1 is a schematic view of a prior art pipe sealing structure.

Fig. 2 is a cross-sectional view of the labyrinth seal pipe of the present utility model.

Fig. 3 is an enlarged view of area a of fig. 2 in accordance with the present utility model.

Fig. 4 is a perspective view of the flange of the present utility model.

List of reference numerals:

1. a pipe sealing structure; 11. a flange plate; 12. sealing the rubber ring; 13. a shell tube; 2. labyrinth sealing the pipe; 21. a flange plate; 211. a second clamping rib; 2111. a flange groove; 2112. a flange bulge; 22. a flexible sealant layer; 23. a conduit housing; 231. the first clamping ribs; 2311. a housing protrusion; 2312. a housing groove; 3. a cavity; 4. and a through hole.

Detailed Description

Preferred embodiments of the present utility model are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are merely for explaining the technical principles of the present utility model, and are not intended to limit the scope of the present utility model. Those skilled in the art can make adjustments as needed to suit a particular application. For example, although described in the specification in connection with a pipe structure including a pipe housing and a flange, it is apparent that the present utility model may be employed in various other forms as long as it is capable of providing a pipe having the labyrinth seal structure of the present utility model.

It should be noted that, in the description of the present utility model, terms such as "upper," "lower," "inner," and the like indicate directions or positional relationships based on the directions or positional relationships shown in the drawings, which are merely for convenience of description, and do not indicate or imply that devices or elements must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated, whereby a feature defining "first," "second," or the like, may explicitly or implicitly include one or more features. In the description of the present utility model, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

Furthermore, it should be noted that, in the description of the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model can be understood by those skilled in the art according to the specific circumstances.

Referring first to fig. 1, there is shown a prior art pipe sealing structure 1, the pipe sealing structure 1 comprising a flange 11, a sealing rubber ring 12 and a shell pipe 13, wherein the sealing rubber ring 12 is placed between the shell pipe 13 and the flange 11, and the shell pipe 13 and the flange 11 are fixed together by bolts, so that the shell pipe 13 and the flange 11 press the sealing rubber ring 12 to seal a pipe. However, the sealing mode requires that the sealing rubber ring 12 is accurately installed on the position of the shell tube 13, certain requirements are met for installation, the installation time is increased, and when the sealing rubber ring is used for a long time, the sealing rubber ring 12 can age and deform or even break due to large change of the temperature of the liquid of the shell tube 13, so that the liquid in the shell tube 13 flows out, and serious quality accidents are caused.

Referring now to fig. 2 and 3, fig. 2 shows a cross-sectional configuration of the labyrinth seal conduit 2 of the present utility model. Fig. 3 shows an enlarged view of region a in fig. 2. As shown in fig. 2, the labyrinth seal pipe 2 comprises a pipe casing 23 and a flange plate 21, a first clamping rib 231 is arranged on the matching surface of the pipe casing 23, a second clamping rib 211 in contact fit with the first clamping rib 231 is arranged on the matching surface of the flange plate 21, when the pipe casing 23 is connected with the flange plate 21 in a matched manner, the first clamping rib 231 and the second clamping rib 211 are in contact fit with each other to form a labyrinth seal structure, the labyrinth seal structure enables the pipe casing 23 to be matched with the flange plate 21 more tightly, and the labyrinth seal pipe 2 can be subjected to larger resistance when liquid flows outwards, so that the labyrinth seal pipe 2 has better sealing performance. In addition, referring to fig. 3, in the present utility model, a flexible sealant layer 22 is filled between the mating surfaces of the pipe casing 23 and the flange 21, and the flexible sealant layer 22 is cured on the mating surfaces of the pipe casing 23 and/or the flange 21, so that the flexible sealant layer 22 can have an external shape consistent with the mating surfaces of the pipe casing 23 and the flange 21, and after the pipe casing 23 and the flange 21 are mated and fixed together, the flexible sealant layer 22 fills the non-planar surface between the pipe casing 23 and the flange 21, and the first clamping ribs 231 and the second clamping ribs 211 are mated more tightly. When the flexible sealing glue layer 22 is acted by the liquid in the pipeline housing 23, the flexible sealing glue layer 22 is acted by the labyrinth sealing structure, so that the movement of the flexible sealing glue layer 22 is blocked, the flexible sealing glue layer 22 cannot relatively displace with the matching surface of the pipeline housing 23 and/or the matching surface of the flange plate 21 due to the pressure of the liquid in the pipeline housing 23, and the sealing performance of the labyrinth sealing pipeline 2 is further improved. In addition, the flexible sealing glue layer 22 is filled between the matching surfaces of the pipeline shell 23 and the flange plate 21, so that buffering can be provided for the labyrinth sealing structure of the matching connection between the pipeline shell 23 and the flange plate 21, and further the risk of fatigue fracture between the first clamping ribs 231 and the pipeline shell 23 or between the second clamping ribs 211 and the flange plate 21 caused by pipeline vibration is reduced.

In addition, the flexible sealing adhesive layer 22 is connected to the matching surface of the pipeline shell 23 or the flange plate 21 in a solidifying way, and the flexible sealing adhesive layer 22 can be more firmly fixed on the matching surface of the pipeline shell 23 or the flange plate 21 due to the labyrinth sealing structure formed after the pipeline shell 23 and the flange plate 21 are matched and connected. Through the connection mode, the risk that the flexible sealing adhesive layer 22 is separated from the matching surface of the pipeline shell 23 or the flange plate 21 due to the change of the temperature of liquid in the pipeline shell 23 and the change of the size of the flexible sealing adhesive layer 22 can be effectively reduced. In particular, the flexible sealing glue layer 2 may be made of vinyl emulsion with flexible main chain and polar side group as main body, but this is not limitative, and any flexible sealing glue layer which can be made to have the function of being solidified on the metal surface in the present utility model and is similar to the labyrinth sealing pipeline 2 in the present utility model will fall within the protection scope of the present utility model.

It should be noted that, in the specific embodiment of the present utility model, the flexible sealant layer 22 may be formed by solidifying a water-swellable flexible sealant, and when the liquid in the pipe casing 23 is under pressure and enters between the mating surfaces of the pipe casing 23 and the flange 21, the flexible sealant layer 22 swells when encountering water, so as to squeeze the liquid out of the mating surfaces of the pipe casing 23 and the flange 21, thereby preventing the liquid from flowing out of the pipe casing 23 through the mating surfaces, and further increasing the tightness of the labyrinth seal pipe 2.

It will be appreciated by those skilled in the art that while the flexible sealant layer 22 has been described above as being formed by curing a water-swellable flexible sealant, this is not limiting and that those skilled in the art will appreciate that the flexible sealant layer 22 may be formed by curing a tacky flexible sealant as desired and that after the pipe housing 23 and the flange 21 are cooperatively joined, the mating surfaces of the pipe housing 23 and the flange 21 are joined together by the tacky flexible sealant layer 22 to provide a better seal for the labyrinth seal pipe 2 without departing from the principles of the present utility model and will therefore fall within the scope of the present utility model.

With continued reference to fig. 3, in the embodiment of the present utility model, the first ribs 231 are housing protrusions 2311 and housing grooves 2312 alternately arranged in sequence on the pipe housing 23, and the second ribs 211 are flange grooves 2111 and flange protrusions 2112 alternately arranged in sequence on the flange 21. When the pipe housing 23 and the flange 21 are coupled together, the housing protrusion 2311 and the flange groove 2111 are engaged with each other, and the housing groove 2312 and the flange protrusion 2112 are engaged with each other, the cross-section of the contact surface of the first clamping rib 231 and the second clamping rib 211 is a multi-L labyrinth seal structure. By means of which the liquid inside the pipe housing 23 can be sealed within the pipe housing 23, by means of which the tightness of the labyrinth seal of the pipe 2 is increased.

It will be appreciated by those skilled in the art that although the first beads 231 described above are the housing protrusions 2311 and the housing grooves 2312 alternately arranged in sequence on the pipe housing 23 and the second beads 211 are the flange grooves 2111 and the flange protrusions 2112 alternately arranged in sequence on the flange 21, this is not limitative, but those skilled in the art can arrange the first beads 231 as a plurality of housing grooves 2312 or a plurality of housing protrusions 2311 on the pipe housing 23 and the second beads 211 as a plurality of flange protrusions 2112 or a plurality of flange grooves 2111 on the flange 21 as required. At this time, after the pipe casing 23 and the flange 21 are coupled together, the casing protrusion 2311 or the casing groove 2312 of the pipe casing 23 serving as the first clamping rib 231 is in contact engagement with the flange groove 2111 or the flange protrusion 2112 of the flange 21 serving as the second clamping rib 211, so that the cross-section of the contact surface of the first clamping rib 231 and the second clamping rib 211 has a plurality of labyrinth seal structures. It will be appreciated that one skilled in the art may also configure the first clamping rib 231 as a plurality of wedge-shaped housing grooves 2312 or a plurality of wedge-shaped housing protrusions 2311 on the pipe housing 23 and the second clamping rib 211 as a plurality of wedge-shaped flange protrusions 2112 or wedge-shaped flange grooves 2111 on the flange plate 21 as required, and that the cross-section of the contact surface of the first clamping rib 231 and the second clamping rib 211 is in a plurality of Z-shaped labyrinth seal structures after the pipe housing 23 and the flange plate 21 are cooperatively connected, which does not deviate from the principle of the present utility model, and thus, the present utility model will also fall within the scope of the present utility model.

Further, regarding the first and second beads 231 and 211, although both are integrally formed with the pipe housing 23 and the flange plate 21, respectively, in the embodiment of fig. 2, this should not limit the scope of the present utility model, as long as a labyrinth seal structure can be formed with the pipe housing 23 and the first and second beads 231 and 211, and the first and second beads 231 and 211 may be provided in any suitable form. Specifically, the first beads 231 may be a single annular member and in an assembled state, simultaneously sealingly abut against the surface of the pipe housing 23 and the surface of the flange 21 and form a labyrinth seal. Similarly, the second bead 211 may be a separate annular member and in the assembled state sealingly abuts and forms a labyrinth seal with the surface of the flange 21 and the surface of the pipe housing 23. Alternatively, the first clamping rib 231 and the second clamping rib 211 may be a single annular member at the same time and have mutually matched structures, and the two can be respectively in sealing low connection with the inner surfaces of the pipeline housing 23 and the flange plate 21, and a labyrinth sealing structure is formed after the pipeline housing 23, the first clamping rib 231 and the second clamping rib 211 are in matched connection with the flange plate 21. In either case, when assembled, the duct housing 23 and the first bayonet 231 and the flange 21 and the second bayonet 211 cooperate to form a labyrinth seal without departing from the principles of the present utility model and, therefore, are intended to fall within the scope of the present utility model.

Referring to fig. 4, as shown in fig. 4, the second clamping rib 211 on the flange 21 is an annular clamping rib, the first clamping rib 231 on the pipe casing 23, which is matched with the second clamping rib 211, is also an annular clamping rib, and the first clamping rib 231 is concentric with the pipe casing 23, and the second clamping rib 211 is also concentric with the flange 21. Accordingly, the labyrinth seal formed by the contact fit of the first beads 231 and the second beads 211 is also an annular labyrinth seal having the same center as the pipe housing 23 and the flange 21. Accordingly, when the pressure reaches a predetermined value after the liquid in the pipe housing 23 flows into the mating surface between the pipe housing 23 and the flange 21 by the pressure, the liquid continues to flow to the outer edge of the mating surface, and after a predetermined distance, the liquid inevitably encounters the labyrinth seal. At this time, the liquid is subjected to a much higher pressure than previously, so that the liquid can pass through the labyrinth seal structure. On the contrary, the liquid is blocked by the labyrinth, and the labyrinth seal structure can further comprehensively seal the labyrinth seal pipeline 2. The labyrinth seal structure can increase the structural strength of the labyrinth seal pipeline 2, reduce the probability of dislocation of the flange plate 21 and the pipeline shell 23 caused by vibration of the labyrinth seal pipeline 2, effectively reduce the abrasion speed of abrasion of the flexible seal adhesive layer 22 caused by vibration of the labyrinth seal pipeline 2, and prolong the service life of the labyrinth seal pipeline.

It will be appreciated by those skilled in the art that although the first clamping rib 231 is a ring concentric with the pipe housing 23 and the second clamping rib 211 is a ring concentric with the flange 21 and the first clamping rib 231 and the second clamping rib 211 can form a labyrinth seal structure, the protection scope of the present utility model should not be limited, as long as the first clamping rib 231 and the second clamping rib 211 are disposed on the mating surfaces of the pipe housing 23 and the flange 21 and can form a labyrinth seal structure on the mating surfaces, the first clamping rib 231 and the second clamping rib 211 may be disposed in any shape or may not be concentric with the pipe housing 23 or the flange 21. For example, the first beads 231 may be provided in a circular ring shape and uniformly distributed on the mating surface of the duct housing 23 in the form of a circular ring. The second ribs 211 are distributed on the mating surface of the flange in the same manner, and when the pipe casing 23 and the flange 21 are in mating connection, the first ribs 231 and the first ribs 211 form a labyrinth seal structure, and the adjustment does not deviate from the principle of the present utility model, and therefore, the adjustment falls within the protection scope of the present utility model.

Referring to fig. 3 and 4, in the embodiment of the present utility model, the labyrinth seal pipe 2 further includes a cavity 3, where the cavity 3 is annularly distributed on the mating surface of the flange 21 and the pipe housing 23, and it will be understood by those skilled in the art that the cavity 3 may be disposed on the flange 21 or on the pipe housing 23, so long as the cavity 3 and the flexible sealant layer 22 form a seal cavity on the mating surface after the pipe housing 23 and the flange 21 are cooperatively connected together. Since the sealing cavity is located inside the first clamping rib 23 and the second clamping rib 21, when the liquid in the pipeline housing 23 enters the matching surface of the pipeline housing 23 and the flange plate 21, the liquid needs to pass through the sealing cavity first, but the liquid can squeeze the sealing cavity in the outward flow process, so that the air pressure in the sealing cavity is increased. In this case, if the liquid is to continue to move in the direction of the seal chamber, a greater pressure is necessary, and on this account, the liquid between the mating surfaces is blocked from the seal chamber by the seal chamber. Thereby reducing the risk of liquid inside the pipe housing 23 escaping by pressure to the outside of the labyrinth seal pipe.

It will be appreciated by those skilled in the art that although the cavities 3 described above in connection with fig. 3 and 4 are uniformly distributed in a ring shape on the mating surface of the flange 21, this is not limitative, and those skilled in the art can also adjust the cavities 3 to a circular annular cavity arranged concentrically with the flange 21 on the basis of the above embodiment, and the circular annular cavity forms a circular annular seal cavity by the flexible seal layer 22 after the flange 21 is cooperatively connected with the pipe housing 23, which adjustment does not deviate from the principle of the present utility model, and thus will fall within the scope of the present utility model.

Referring to fig. 3, in the embodiment of the present utility model, the pipe casing 23 and the flange 21 are connected by bolts, specifically, through holes 4 with annular distribution and coincident holes are disposed between the outer edges of the pipe casing 23 and the flange 21 and the labyrinth seal structure, and the bolts pass through the through holes 4 to connect the pipe casing 23 and the flange 21 together in a matching manner.

It will be appreciated by those skilled in the art that although the above description is made with reference to fig. 2 and 3 in which the through holes 4 are formed in the pipe housing 23 and the flange 21 in a hole-like manner, this is not limitative, but those skilled in the art may also make it possible to form the through holes 4 in the pipe housing 23 or the flange 21, form the threaded holes in the flange 21 or the pipe housing 23 in a hole-like manner in which the through holes 4 are formed in the through holes, and then screw the bolts through the through holes 4 in the pipe housing 23 or the flange 21 and the threaded holes 5 in the flange 21 to make the pipe housing 23 and the flange 21 cooperatively connected, without departing from the principle of the present utility model, and thus will fall within the scope of the present utility model.

Referring to fig. 4, in the embodiment of the present utility model, the bottom surface of the flange groove 2111 and the top surface of the housing protrusion 2311 are provided with the wave-shaped lines 6 engaged with each other, and the top surface of the flange protrusion 2112 and the bottom surface of the housing groove 2312 are provided with the wave-shaped lines 6 engaged with each other, and the labyrinth seal structure formed by the mating connection of the pipe housing 23 and the flange 21 is more tightly matched through the wave-shaped lines 6, so that the tightness of the labyrinth seal pipe 2 of the present utility model is further improved.

It should be noted that, the direction of the wavy lines may be along the radial direction of the flange 21 or the pipe casing 23, or may be along the circumferential direction of the flange 21 or the pipe casing 23, or the wavy lines may be simultaneously disposed along the circumferential and radial directions, so as to increase the sealing performance of the channel with the labyrinth seal structure.

Referring to fig. 3, in the embodiment of the present utility model, a first space is formed between the flange groove 2111 and the flange protrusion 2112, a second space is formed between the housing protrusion 2311 and the housing groove 2312, and the mating strength between the grooves and the protrusions is increased by the first space and the second space, so as to increase the sealing performance of the labyrinth seal pipe. And the first interval is equal to the second interval, so as to increase the precision of the fit between the first clamping rib 231 and the second clamping rib 211. The size of the space can be determined according to actual needs, and will not be described herein.

It will be appreciated by those skilled in the art that while a first spacing exists between the flange recess 2111 and the flange protrusion 2112 as described above in connection with fig. 3, this is not limiting and that those skilled in the art will appreciate that it is possible to locate the flange recess 2111 adjacent to the flange protrusion 2112 and the housing protrusion 2311 adjacent to the housing recess 2312 as desired without departing from the principles of the present utility model and as such will fall within the scope of the present utility model.

The utility model also provides an air source heat pump unit, which comprises the labyrinth seal pipeline 2 in any embodiment.

It should be noted that the present utility model should not be limited thereto. Equivalent modifications and substitutions for related technical features may be made by those skilled in the art without departing from the principles of the present utility model, and such modifications and substitutions will fall within the scope of the present utility model.

Claims (10)

1. A labyrinth seal conduit, comprising:

the pipeline comprises a pipeline shell and a flange plate which is connected to the pipeline shell in a matched mode, wherein a first clamping rib is arranged on a matching surface of the pipeline shell, a second clamping rib is arranged on a matching surface of the flange plate, and the first clamping rib is in contact fit with the second clamping rib to form a labyrinth sealing structure;

the flexible sealing glue layer is formed by solidifying the flexible sealing glue filled between the matching surfaces of the pipeline shell and the flange plate.

2. The labyrinth seal of claim 1, wherein the first and second clamping bars are annular clamping bars, the first clamping bar is concentric with the pipe housing, and the second clamping bar is concentric with the flange.

3. The labyrinth seal pipeline as recited in claim 2, wherein the first clamping rib is a housing protrusion and/or a housing groove arranged on the matching surface of the pipeline housing, the second clamping rib is a flange protrusion and/or a flange groove arranged on the matching surface of the flange plate, and the cross section of the contact surface of the first clamping rib and the second clamping rib is L-shaped, Z-shaped or S-shaped.

4. A labyrinth seal pipe as claimed in claim 3, wherein said flange is provided with both said flange grooves and said flange projections, said flange grooves and said flange projections being alternately arranged in sequence;

the pipeline shell is simultaneously provided with the shell protrusions and the shell grooves, and the shell protrusions and the shell grooves are alternately arranged in sequence.

5. The labyrinth seal as in claim 4 wherein a first spacing is provided between the flange groove and the flange boss and a second spacing is provided between the housing boss and the housing groove, the first spacing being equal to the second spacing.

6. The labyrinth seal of claim 1, wherein said pipe housing and said flange are bolted.

7. The labyrinth seal conduit as recited in claim 1, further comprising:

the cavity is arranged on the matching surface of the flange plate and the pipeline shell, and a sealing cavity is formed by the cavity through the flexible sealing adhesive layer and the matching surface.

8. The labyrinth seal conduit as recited in claim 7 wherein a plurality of said cavities are annularly disposed on mating surfaces of said flange and said conduit housing.

9. The labyrinth seal conduit as recited in claim 1, wherein the flexible sealant layer is formed from a water-swellable flexible sealant by curing.

10. An air source heat pump unit, characterized in that a labyrinth seal pipe according to any one of claims 1-9 is provided in the air source heat pump unit.

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