Jacketed pipe connecting device

Abstract

A jacketed pipe connecting device, comprising an initial unit (100), wherein the initial unit (100) comprises an initial sleeve (101) and a clamp (102) arranged at one end of the initial sleeve (101); and an extending unit (200) comprising an extending sleeve (201) and a connecting ring (202) fixed at one end of the extending sleeve (201).

Description

Jacketed pipe connecting device TECHNICAL FIELD

[0001] The present application relates to the technical field of jacketed pipe connecting, in particular to a jacketed pipe connecting device. BACKGROUND

[0002] The existing SCR device liquid ammonia station area is a fourth level major hazard source, and there are safety hazards in the transportation, storage and use of liquid ammonia. According to the increasingly strict safety and environmental protection situation requirements and the actual needs of the risk prevention and control of power plant safety production, it is necessary for the power plant to carry out comprehensive management of ammonia area major hazard sources. The process and economy of urea hydrolysis and urea pyrolysis (electric heater) can both provide mature and reliable safe ammonia supply, and the product gas quality provided by urea hydrolysis is more stable and reliable, and the operation cost is lower than that of urea pyrolysis scheme. The product gas temperature from the hydrolysis reactor near the boiler needs to be maintained above a certain temperature (minimum 135℃) to prevent the generation of ammonium carbamate in the pipeline, so the product gas pipeline between the hydrolysis reactor and the ammonia / air mixer on the SCR side of the boiler needs to be steam traced. Due to the different lengths of the pipeline, the existing jacketed pipe tracing is convenient for connecting the jacketed pipes, but in use, the same length of jacketed pipe needs to be manufactured according to the different lengths of the pipeline, which is easy to cause waste.

[0003] SUMMARY

[0004] In this section, as well as in the abstract and title of the specification, some simplification or omission may be made to avoid obscuring the purpose of this section, the abstract and the title, and such simplification or omission cannot be used to limit the scope of the application.

[0005] The purpose of the present application is to provide a jacketed pipe connecting device which can solve the problem that due to the different lengths of the pipeline, the existing jacketed pipe tracing is convenient for connecting the jacketed pipes, but in use, the same length of jacketed pipe needs to be manufactured according to the different lengths of the pipeline, which is easy to cause waste.

[0006] To solve the above technical problems, the present application provides the following technical scheme: a jacketed pipe connecting device, comprising an initial unit, the initial unit comprising an initial jacketed pipe and a clamp arranged at one end of the initial jacketed pipe; an extension unit, the extension unit comprising an extension jacketed pipe and a connecting ring fixed at one end of the extension jacketed pipe; a connecting unit, the connecting unit comprising a bearing assembly, a sealing assembly rotating in the bearing assembly, and an adjusting assembly arranged outside the bearing assembly, and the end of the initial jacketed pipe away from the clamp and the end of the extension jacketed pipe away from the connecting ring are both provided with the bearing assembly.

[0007] As a preferred scheme of the sleeve pipe connecting device, the outer side of the initial sleeve pipe is provided with an input pipe and a first output pipe, the input pipe and the first output pipe are provided with valves, one end of the initial sleeve pipe close to the clamp is fixedly connected with a blocking ring, and the clamp is arranged at the outer ring of the blocking ring.

[0008] As a preferred scheme of the sleeve pipe connecting device, the outer side of the initial sleeve pipe is provided with an input pipe and a first output pipe, the input pipe and the first output pipe are provided with valves, one end of the initial sleeve pipe close to the clamp is fixedly connected with a blocking ring, and the clamp is arranged at the outer ring of the blocking ring.

[0009] As a preferred scheme of the sleeve pipe connecting device, the outer side of the initial sleeve pipe is provided with an input pipe and a first output pipe, the input pipe and the first output pipe are provided with valves, one end of the initial sleeve pipe close to the clamp is fixedly connected with a blocking ring, and the clamp is arranged at the outer ring of the blocking ring.

[0010] As a preferred scheme of the sleeve pipe connecting device, the outer side of the initial sleeve pipe is provided with an input pipe and a first output pipe, the input pipe and the first output pipe are provided with valves, one end of the initial sleeve pipe close to the clamp is fixedly connected with a blocking ring, and the clamp is arranged at the outer ring of the blocking ring.

[0011] As a preferred scheme of the sleeve pipe connecting device, the outer side of the initial sleeve pipe is provided with an input pipe and a first output pipe, the input pipe and the first output pipe are provided with valves, one end of the initial sleeve pipe close to the clamp is fixedly connected with a blocking ring, and the clamp is arranged at the outer ring of the blocking ring.

[0012] As a preferred scheme of the sleeve pipe connecting device, the outer side of the initial sleeve pipe is provided with an input pipe and a first output pipe, the input pipe and the first output pipe are provided with valves, one end of the initial sleeve pipe close to the clamp is fixedly connected with a blocking ring, and the clamp is arranged at the outer ring of the blocking ring.

[0013] As a preferred scheme of the sleeve pipe connecting device, the outer side of the initial sleeve pipe is provided with an input pipe and a first output pipe, the input pipe and the first output pipe are provided with valves, one end of the initial sleeve pipe close to the clamp is fixedly connected with a blocking ring, and the clamp is arranged at the outer ring of the blocking ring.

[0014] As a preferred scheme of the jacket pipe connecting device, the limiting member comprises a third groove and a through groove in the fixed plate, a spring in the third groove, a clamping plate sliding in the third groove, and a clamping column sliding in the through groove, and the two ends of the spring are fixed to the side wall of the third groove and one end of the clamping plate respectively.

[0015] As a preferred scheme of the jacket pipe connecting device, the adjusting assembly comprises a rotating ring rotating outside the first fixed ring, a fixed ring fixed to one side of the rotating ring, a rack fixed to one side of the fixed ring, and a through groove penetrating one side of the rotating ring, the fixed ring rotates in the first groove, the rack is matched with the fixed plate, and the through groove is matched with the L-shaped plate.

[0016] The jacket pipe connecting device has the following beneficial effects: through the setting of the connecting unit, the rotation of the sealing assembly is realized by operating the adjusting assembly, so that the sealing of one end of the jacket pipe is realized, steam leakage during steam tracing is prevented, the effect of steam tracing is reduced, the rotation of the sealing assembly is realized by the cooperation of the L-shaped plate and the connecting unit to contact the sealing effect of the pipeline, the initial jacket pipe and the extended jacket pipe are connected and fixed through the action of the L-shaped plate and the sealing assembly, the connection of the two is ensured, and the steam is ensured to enter the extended jacket pipe. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor. Among them:

[0018] Fig. 1 is a structural schematic view of the jacket pipe connecting device.

[0019] Fig. 2 is a sectional view of the initial unit.

[0020] Fig. 3 is a sectional view of the extended unit.

[0021] Fig. 4 is an enlarged structural schematic view of A in Fig. 3.

[0022] Fig. 5 is a structural schematic view of the bearing assembly.

[0023] Fig. 6 is an enlarged structural schematic view of B in Fig. 5.

[0024] Fig. 7 is a structural schematic view of the sealing assembly.

[0025] Fig. 8 is a schematic view of a top sectional structure of the sealing assembly.

[0026] Fig. 9 is a schematic view of a structure of the adjusting assembly.

[0027] Fig. 10 is a schematic view of an enlarged structure at C in Fig. 9. DETAILED DESCRIPTION

[0028] In order to make the above objectives, features and advantages of the present application more apparent, specific embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0029] In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, it will be apparent to one skilled in the art that the present application can be practiced without the specific details given herein. In other instances, well-known methods have not been described in detail in order to avoid unnecessarily obscuring the present application. Therefore, the specific embodiments of the present application as set forth are not intended to be inclusive of other embodiments which can be practiced within the scope of the present application.

[0030] Secondly, the term "one embodiment" or "an embodiment" as used herein means that a particular implementation can include a particular feature, structure, or characteristic, but every embodiment can not necessarily include the particular feature, structure, or characteristic. Furthermore, the following claims can refer to "one embodiment" or "an embodiment" in the sense of claiming a particular feature, structure, or characteristic of more than one embodiment.

[0031] Embodiment 1

[0032] Referring to Figs. 1-3, a first embodiment of the present application provides a jacketed pipe connecting device, which includes an initial unit 100, the initial unit 100 including an initial jacket 101 and a clamp 102 arranged at one end of the initial jacket 101; an extension unit 200, the extension unit 200 including an extension jacket 201 and a connecting ring 202 fixed at one end of the extension jacket 201; a connecting unit 300, the connecting unit 300 including a bearing assembly 301, a sealing assembly 302 rotatable in the bearing assembly 301, and an adjusting assembly 303 arranged outside the bearing assembly 301, and the initial jacket 101 and the extension jacket 201 are both provided with the bearing assembly 301 at the end away from the clamp 102 and the connecting ring 202.

[0033] In use, the initial sleeve 101 is used as an initial section, first, the initial sleeve 101 is sleeved on the outer circle of the product gas pipeline, then the initial sleeve 101 is fixed on the outer circle of the product gas pipeline through the clamp 102, and the sealing assembly 302 is controlled through the adjusting assembly 303 to make the other end of the initial sleeve 101 in a sealed state, and in the process, the pipe is clamped through the movable block 302d, which can increase the support stability of the clamping sleeve, and through the cooperation between the L-shaped plate 202a and the connecting unit 300, the connection of the initial sleeve 101 and the extension sleeve 201 can be realized, and in the process of connection, the sealing assembly 302 can be released from the sealing effect of the initial sleeve 101, so that the steam entering through the input pipe 101a can enter the extension sleeve 201, then the adjusting assembly 303 at one end of the extension sleeve 201 is rotated, the sealing assembly 302 is controlled to seal the extension sleeve 201, then the valve of the first output pipe 101b is closed, and the steam outlet pipe is connected to the second output pipe 201a.

[0034] Embodiment 2

[0035] Referring to FIG. 1, the second embodiment of the present application is different from the first embodiment in that: the outer side of the initial sleeve 101 is provided with an input pipe 101a and a first output pipe 101b, the input pipe 101a and the first output pipe 101b are provided with valves, the end of the initial sleeve 101 close to the clamp 102 is fixedly connected with a blocking ring 101c, and the clamp 102 is arranged on the outer circle of the blocking ring 101c.

[0036] The steam enters the pipeline through the input pipe 101a, then the steam enters the initial sleeve 101, then the steam is discharged through the first output pipe 101b connected to the steam outlet pipe, and the initial sleeve 101 is fixed on the outer circle of the product gas pipeline through the clamp 102 to ensure its stability, and the clamp 102 is prior art, which will not be described in detail.

[0037] Specifically, the outer side of the extension sleeve 201 is provided with a second output pipe 201a, the connecting ring 202 is fixed to one end of the extension sleeve 201, the connecting ring 202 is fixedly connected with an L-shaped plate 202a on one side, and the first clamping groove 202b is formed in the side of the L-shaped plate 202a close to the connecting ring 202.

[0038] The extension sleeve 201 is the extension section of the initial sleeve 101, and the connection between the extension sleeve 201 and the initial sleeve 101 is effectively ensured through the cooperation of the connecting ring 202 with the inner ring of the initial sleeve 101 and the cooperation between the L-shaped plate 202a and the adjusting assembly 303 and the sealing assembly 302, and the sealing ring is arranged at the connection between the two, so that the sealing property of the connection between the two is ensured, and the outlet of the steam can be adjusted through the valves on the first output pipe 101b and the second output pipe 201a, so that the steam is prevented from overflowing from the middle section and the steam tracing effect is reduced.

[0039] The first clamping groove 202b is matched with the clamping column 302h-6, the outer ring of the first clamping groove 202b is provided with a chamfer, the opening range of the first clamping groove 202b is expanded, the clamping effect between the first clamping groove 202b and the clamping column 302h-6 is not affected, and through the chamfer, the clamping column 302h-6 can be extruded by rotating the extension sleeve 201 through the contact between the chamfer and the spherical surface of the clamping column 302h-6, so that the two are conveniently disassembled.

[0040] Embodiment 3

[0041] Referring to FIGS. 5-8, the third embodiment of the present application is based on the first two embodiments, and the bearing assembly 301 comprises a first fixed ring 301a fixed to the inner ring of the initial sleeve 101 and the clamp 102, a second fixed ring 301c provided with the same center as the first fixed ring 301a, and a connecting plate 301d fixed to one side of the first fixed ring 301a and the second fixed ring 301c, a first recess 301b is formed on the outer side of the first fixed ring 301a, and a second recess 301e is formed on the inner ring of the second fixed ring 301c.

[0042] Further, a second clamping groove 301f is formed on one side of the first recess 301b, a first through hole 301g is formed on the side wall of the first recess 301b, the first through hole 301g corresponds to the second clamping groove 301f, a gasket 301h is fixed to the outer ring of the second fixed ring 301c, and a second through hole 301i is formed on the outer ring of the second fixed ring 301c and communicates with the second recess 301e.

[0043] The first fixed ring 301a and the second fixed ring 301c are connected through the connecting plate 301d, which can ensure the stability of the second fixed ring 301c, and the number of the connecting plate 301d can be set according to the situation, but the stability of the second fixed ring 301c needs to be ensured. The number of the first through hole 301g, the second through hole 301i and the second clamping groove 301f corresponds, and the number needs to be set according to the size of the movable plate 302a, so that the movable plate 302a can seal the space between the inner ring of the first fixed ring 301a and the outer ring of the second fixed ring 301c. Through the setting of the gasket 301h, the movable plate 302a can be contacted, which helps to seal the space in the initial sleeve 101 or the extension sleeve 201. The first groove 301b is used to ensure the cooperation between the adjusting assembly 303 and the fixed plate 302e, and the second clamping groove 301f is used to match the limiting piece 302h to limit the fixed plate 302e.

[0044] The inner ring of the second fixed ring 301c can be provided with an elastic ring, which can close the second groove 301e. When the threaded rod 302b rotates to drive the movable block 302d to move, the elastic ring is extruded. Through the extrusion of the plurality of movable blocks 302d, the elastic ring will tightly adhere to the outer ring of the product air pipe, which can further ensure the sealing effect.

[0045] The second clamping groove 301f is clamped and matched with one end of the clamping plate 302h-4. Through the setting of the chamfer on both sides of the second clamping groove 301f and the matching with the inclined surface of the clamping plate 302h-4, the clamping plate 302h-4 can be moved out of the second clamping groove 301f when the rotating ring 303a is rotated with appropriate force, but the stability of the movable plate 302a can also be ensured during normal use of the device.

[0046] Specifically, the sealing assembly 302 includes a movable plate 302a arranged between the inner ring of the first fixed ring 301a and the outer ring of the second fixed ring 301c, threaded rods 302b and connecting rods 302c respectively fixed on both sides of the movable plate 302a, movable blocks 302d sleeved on the outer ring of the threaded rods 302b, a fixed plate 302e fixed on one end of the connecting rod 302c, and a limiting piece 302h arranged in the fixed plate 302e.

[0047] Further, one side of the movable plate 302a is provided with a placing groove 302f, and the other side of the movable plate 302a is fixedly connected with a placing plate 302g which is matched with the placing groove 302f. The movable block 302d is threadedly matched with the threaded rod 302b.

[0048] Further, the connecting rod 302c and the threaded rod 302b are respectively rotatable in the first through hole 301g and the second through hole 301i through sealing bearings, the movable block 302d is arranged in the second groove 301e, and the movable plate 302a is matched with the gasket 301h on the side close to the second fixed ring 301c.

[0049] The side of the movable plate 302a matched with the inner ring of the first fixed ring 301a is arranged as an arc surface, and the side of the movable plate 302a in contact with the outer ring of the second fixed ring 301c is a plane, so as to ensure that the movable plate 302a can rotate smoothly between the first fixed ring 301a and the second fixed ring 301c, and the position of the movable plate 302a in contact with the inner ring of the first fixed ring 301a is provided with a sealing gasket, and the gasket 301h is also arranged to compensate for the distance between the plane of the movable plate 302a and the outer ring of the second fixed ring 301c, so as to ensure the sealing effect, and the size and number of the movable plate 302a can be set according to actual conditions, but the sealing property of the connection needs to be ensured.

[0050] Through the arrangement of the placement plate 302g and the placement groove 302f, the plurality of movable plates 302a can be matched or separated during rotation, and the positions of the placement groove 302f and the placement plate 302g in contact with each other are provided with sealing gaskets, so as to ensure the tightness of the connection between the plurality of movable plates 302a.

[0051] Through the arrangement of the fixed plate 302e, the toothed part of the fixed plate 302e is engaged with the rack 303d, so that the movable plate 302a can be driven to rotate when the rotating ring 303a rotates, and through the cooperation of the plane part on the fixed plate 302e and the L-shaped plate 202a, the connection between the extension sleeve 201 and the initial sleeve 101 can be limited.

[0052] Specifically, the limiting piece 302h includes a third groove 302h-1 and a through groove 302h-2 arranged in the fixed plate 302e, a spring 302h-3 arranged in the third groove 302h-1, a clamping plate 302h-4 sliding in the third groove 302h-1, and a clamping column 302h-6 sliding in the through groove 302h-2, and the two ends of the spring 302h-3 are respectively fixed to the side wall of the third groove 302h-1 and one end of the clamping plate 302h-4; the side of the clamping plate 302h-4 close to the clamping column 302h-6 is provided with a limiting groove 302h-5, the limiting groove 302h-5 is slidingly matched with the clamping column 302h-6, the clamping plate 302h-4 is matched and engaged with the second clamping groove 301f, and the clamping column 302h-6 is matched with the first clamping groove 202b.

[0053] By the setting of the clamping column 302h-6, when the inclined surface on the L-shaped plate 202a contacts the clamping column 302h-6, the clamping plate 302h-4 can be driven to move into the third groove 302h-1 by the cooperation of the clamping column 302h-6 and the limiting groove 302h-5. When the clamping column 302h-6 is aligned with the first clamping groove 202b, the clamping column 302h-6 will be clamped in the first clamping groove 202b at this time, and a larger force is required to separate the first clamping groove 202b and the clamping column 302h-6. When the clamping plate 302h-4 contacts the second clamping groove 301f, the fixed plate 302e can be limited, thereby limiting the rotation of the movable plate 302a.

[0054] Specifically, the adjusting assembly 303 includes a rotating ring 303a rotating outside the first fixed ring 301a, a fixed ring 303b fixed to one side of the rotating ring 303a, a rack 303d fixed to one side of the fixed ring 303b, and a through groove 303c penetrating the one side of the rotating ring 303a. The fixed ring 303b rotates in the first groove 301b, the rack 303d cooperates with the fixed plate 302e, and the through groove 303c is adapted to the L-shaped plate 202a.

[0055] The setting of the rotating ring 303a and the fixed ring 303b can adjust the rotation of the movable plate 302a by rotating the rotating ring 303a when the extension sleeve 201 is not connected. When connected, the L-shaped plate 202a is inserted through the through groove 303c to cooperate with the fixed plate 302e to complete the connection. The connecting plate 301d and the second fixed ring 301c can also support the sleeve after connection to ensure its bearing capacity.

[0056] In use, when the extension sleeve 201 is not needed to be connected, in the initial state, the movable plate 302a is in the unclosed state, after the initial sleeve 101 is sleeved on the outer circle of the product gas pipeline, the rotating ring 303a is counterclockwise rotated, the rotating of the rotating ring 303a drives the fixed ring 303b to rotate, due to the engagement of the rack 303d and the toothed part of the fixed plate 302e, the fixed plate 302e is driven to rotate, the movable plate 302a is also rotated, the placement plate 302g and the placement groove 302f between the plurality of movable plates 302a cooperate with each other, so that the initial sleeve 101 is closed, the rotating will drive the movable block 302d to move towards the center of the second fixed ring 301c, the product gas pipeline is clamped and fixed by the movable block 302d, the stability after the initial sleeve 101 is installed is ensured, and the sealing effect is also ensured; when the extension sleeve 201 needs to be connected, only the extension sleeve 201 needs to be sleeved on the outer circle of the product gas pipeline, then the L-shaped plate 202a is driven to penetrate the slot 303c, when it is moved to the abutting position of the initial sleeve 101 and the extension sleeve 201, the extension sleeve 201 is clockwise rotated with great force, the extension sleeve 201 drives the rotating ring 303a to rotate through the L-shaped plate 202a, the rack 303d first drives the fixed plate 302e to rotate, at this time, the clamping plate 302h-4 is moved out of the second clamping groove 301f by rotating with great force, and the distance between the L-shaped plate 202a and the fixed plate 302e prevents the clamping plate 302h-4 from affecting the operation of the L-shaped plate 202a, after the extension sleeve 201 is rotated by an appropriate distance, the rack 303d drives the fixed plate 302e to rotate to the original position, and at this time, the plane of the fixed plate 302e is parallel to the side wall of the first recess 301b, then the extension sleeve 201 is continuously rotated, the L-shaped plate 202a is moved, the L-shaped plate 202a is first moved to the plane of the fixed plate 302e, then slides, when the L-shaped plate 202a contacts the clamping column 302h-6, the extension sleeve 201 is continuously rotated, since the plane of the fixed plate 302e and the L-shaped plate 202a have a mutual limiting relationship, the fixed plate 302e will not be rotated, the clamping column 302h-6 drives the clamping plate 302h-4 to move, when the clamping column 302h-6 is aligned with the first clamping groove 202b, at this time, the clamping column 302h-6 is clamped in the first clamping groove 202b, the connection of the two is completed, when it is removed, the extension sleeve 201 is reversely rotated with great force, and the above steps are operated.

[0057] In summary, in use, first, the product gas pipeline outer circle is sleeved into the input pipe 101a, and is moved to the end of the product gas pipeline, one end of the initial sleeve 101 is fixed by the clamp 102, then according to the length of the product gas pipeline, it is selected whether the extension sleeve 201 needs to be connected with the initial sleeve 101 or needs to be connected with several extension sleeves 201, if not, the initial sleeve 101 is sealed by counterclockwise rotating the rotating ring 303a through the cooperation of the sealing assembly 302 and the bearing assembly 301, and then it can be used, if it needs to be connected, it needs to be completed through the cooperation between the L-shaped plate 202a and the connecting unit 300, and the specific implementation is shown in embodiment 2.

[0058] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, not to limit it. Although the present application has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solutions of the present application can be modified or replaced equivalently without departing from the spirit and scope of the present application, which should be covered in the scope of the claims of the present application.

Claims

1. A jacketed pipe coupling device, characterized by: The utility model relates to a kind of medical treatment device, including, Initial unit (100), the initial unit (100) includes initial sleeve (101) and the clamp (102) being arranged at the one end of initial sleeve (101); Extension unit (200), the extension unit (200) includes extension sleeve (201) and the connecting ring (202) being fixed at the one end of extension sleeve (201); Connecting unit (300), the connecting unit (300) includes bearing assembly (301), seal assembly (302) being rotated in bearing assembly (301) and adjusting assembly (303) being arranged outside bearing assembly (301), and the one end of initial sleeve (101) away from clamp (102) and the one end of extension sleeve (201) away from connecting ring (202) are all provided with bearing assembly (301).

2. The jacketed pipe coupling apparatus of claim 1, wherein: The outside of the initial sleeve (101) is provided with input pipe (101a) and first output pipe (101b), and valves are provided on the input pipe (101a) and the first output pipe (101b). The one end of the initial sleeve (101) close to the clamp (102) is fixedly connected with a retaining ring (101c), and the clamp (102) is arranged outside the retaining ring (101c).

3. The jacketed pipe coupling of claim 2, wherein: The outside of the extension sleeve (201) is provided with a second output pipe (201a), and the connecting ring (202) is fixed to one end of the extension sleeve (201). The connecting ring (202) is fixedly connected with an L-shaped plate (202a) on one side. The first clamping groove (202b) is formed on the side of the L-shaped plate (202a) close to the connecting ring (202).

4. The jacketed pipe coupling of claim 3, wherein: The bearing assembly (301) includes a first fixed ring (301a) fixed to the initial sleeve (101) and the inner circle of the clamp (102), a second fixed ring (301c) arranged with the same center as the first fixed ring (301a), and a connecting plate (301d) fixed to one side of the first fixed ring (301a) and the second fixed ring (301c). The first fixed ring (301a) is provided with a first recess (301b) on the outside. The second fixed ring (301c) is provided with a second recess (301e) on the inner circle.

5. The jacketed pipe coupling of claim 4, wherein: The first recess (301b) is provided with a second clamping groove (301f) on one side. The sidewall of the first recess (301b) is provided with a first through hole (301g). The first through hole (301g) corresponds to the second clamping groove (301f). The second fixed ring (301c) is fixed with a gasket (301h) on the outer circle. The second fixed ring (301c) is provided with a second through hole (301i) communicating with the second recess (301e) on the outer circle.

6. The jacketed pipe coupling apparatus of claim 5, wherein: The sealing assembly (302) comprises a movable plate (302a) arranged between the inner ring of the first fixed ring (301a) and the outer ring of the second fixed ring (301c), threaded rods (302b) and connecting rods (302c) fixed on both sides of the movable plate (302a) respectively, movable blocks (302d) sleeved on the outer ring of the threaded rods (302b), a fixed plate (302e) fixed on one end of the connecting rods (302c), and a limiting piece (302h) arranged in the fixed plate (302e).

7. The jacketed pipe coupling of claim 6, wherein: One side of the movable plate (302a) is provided with a placing groove (302f), and the other side of the movable plate (302a) is fixedly connected with a placing plate (302g) matched with the placing groove (302f), and the movable blocks (302d) are threadedly matched with the threaded rods (302b).

8. The jacketed pipe coupling of claim 7, wherein: The connecting rods (302c) and the threaded rods (302b) are rotatable in the first through hole (301g) and the second through hole (301i) through sealing bearings, the movable blocks (302d) are arranged in the second groove (301e), and the side of the movable plate (302a) close to the second fixed ring (301c) is matched with the gasket (301h).

9. The jacketed pipe coupling of claim 8, wherein: The limiting piece (302h) comprises a third groove (302h-1) and a through groove (302h-2) formed in the fixed plate (302e), a spring (302h-3) arranged in the third groove (302h-1), a clamping plate (302h-4) sliding in the third groove (302h-1), and a clamping column (302h-6) sliding in the through groove (302h-2), and the two ends of the spring (302h-3) are fixed to the side wall of the third groove (302h-1) and one end of the clamping plate (302h-4) respectively; The side of the clamping plate (302h-4) close to the clamping column (302h-6) is provided with a limiting groove (302h-5) matched with the clamping column (302h-6), the clamping plate (302h-4) is matched with the second clamping groove (301f), and the clamping column (302h-6) is matched with the first clamping groove (202b).

10. The jacketed pipe coupling of claim 9, wherein: The adjusting assembly (303) comprises a rotating ring (303a) rotating outside the first fixed ring (301a), a fixed ring (303b) fixed on one side of the rotating ring (303a), a rack (303d) fixed on one side of the fixed ring (303b), and a through groove (303c) penetrating one side of the rotating ring (303a), the fixed ring (303b) rotates in the first groove (301b), the rack (303d) is matched with the fixed plate (302e), and the through groove (303c) is matched with the L-shaped plate (202a).

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