CN213424607U - Tube connecting furnace and sealing device thereof - Google Patents

Abstract

The utility model discloses a tubular connecting furnace and a sealing device thereof, wherein the sealing device comprises a first sealing and clamping mechanism connected to the end part of a supporting tube of the tubular connecting furnace; the first sealing and clamping mechanism comprises a first clamping and supporting seat, a first clamping ring and a first clamping and adjusting piece; a first positioning channel which penetrates through the two opposite ends of the first clamping support seat and is used for the cladding tube to penetrate through is arranged in the first clamping support seat; the first clamping ring is arranged in the positioning channel and is used for being tightly attached to the cladding tube; the first clamp adjustment member couples to and adjusts a clamping degree of the first clamp ring. The utility model discloses a sealing device for the tubular connection stove provides certain connecting pressure and guarantees the position precision that the cladding tube is connected, realizes on the port of end plug press fit to the cladding tube.

Description

Tube connecting furnace and sealing device thereof

Technical Field

The utility model relates to a nuclear power equipment technical field especially relates to a tubular connecting furnace and sealing device thereof.

Background

Silicon carbide (SiC) ceramic materials are of great interest in the selection of materials for nuclear power plants due to their excellent radiation and oxidation resistance and extremely low thermal neutron absorption cross-sections. Particularly, the SiC composite material fuel cladding which is widely concerned internationally in recent years has excellent accident fault tolerance capability, hopefully and greatly improves the nuclear power safety, and avoids the leakage and the diffusion of radioactive nuclear substances.

However, since SiC ceramics are very brittle and hard and it is very difficult to prepare large, complex shaped SiC materials, especially for thin-walled long cladding tube applications, because of the loading of nuclear fuel inside, the SiC cladding tube and end plug must be encapsulated using joining techniques after the loading of the nuclear fuel. Thin-wall pressurization, through-hole sealing at both ends, long tube characteristics and the need for high temperatures in excess of 1200 ℃, present unique requirements for equipment for cladding-tube connections, while packaging issues limit the engineering application of SiC cladding.

In the current published reports at home and abroad, the research is only limited to the connection of a block or a short pipe sub-simulated cladding, the connection of a thin-wall long pipe is not really realized, a common brazing furnace cannot be connected with the long cladding pipe, and the cost is increased, the efficiency is reduced and the operation complexity is improved even if a large-sized pipe type connecting furnace is used for production.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is to provide a tube connecting furnace and sealing device for connecting cladding pipe and end plug.

The utility model provides a technical scheme that its technical problem adopted is: providing a sealing device of a tube connecting furnace for connecting a cladding tube and an end plug, the sealing device comprising a first sealing clamp mechanism connected to an end of a support tube of the tube connecting furnace;

the first sealing and clamping mechanism comprises a first clamping and supporting seat, a first clamping ring and a first clamping and adjusting piece; a first positioning channel which penetrates through the two opposite ends of the first clamping support seat and is used for the cladding tube to penetrate through is arranged in the first clamping support seat; the first clamping ring is arranged in the positioning channel and is used for being tightly attached to the cladding tube; the first clamp adjustment member couples to and adjusts a clamping degree of the first clamp ring.

Preferably, one end of the first clamping adjusting piece penetrates into the first clamping support seat to be connected with the first clamping ring, and the other end of the first clamping adjusting piece is positioned outside the first clamping support seat.

Preferably, the sealing device further comprises a second seal clamping mechanism;

the second sealing and clamping mechanism comprises a second clamping and supporting seat connected with the first clamping and supporting seat, a second clamping ring and a second clamping and adjusting piece;

a second positioning channel which penetrates through the two opposite ends of the second clamping and supporting seat and is used for the cladding tube to penetrate through is arranged in the second clamping and supporting seat; the second clamping ring is arranged in the second positioning channel and is used for being tightly attached to the cladding tube; the second clamp adjustment member is coupled to and adjusts a clamping degree of the second clamp ring.

Preferably, one end of the second clamping adjusting piece penetrates into the second clamping support seat to be connected with the second clamping ring, and the other end of the second clamping adjusting piece is positioned outside the second clamping support seat.

Preferably, the sealing device further comprises a ventilation mechanism;

the air exchange mechanism comprises an air exchange main body tightly connected between the first clamping support seat and the second clamping support seat; the ventilation body is internally provided with a cavity communicated with the first positioning channel and the second positioning channel, and the ventilation body is provided with an air valve communicated with the cavity.

Preferably, a first convex ring matched with the first connecting lug is arranged on the periphery of one end, facing the first sealing and clamping mechanism, of the first clamping and supporting seat; the ventilation main body is tightly connected with the first clamping support seat through clamping the clamping heads on the first connecting lug and the second convex ring.

Preferably, a protruding second engaging lug is arranged on the periphery of one end, facing the second sealing and clamping mechanism, of the ventilation main body, and a sealing engaging lug matched with the second engaging lug is arranged on the periphery of one end, facing the ventilation main body, of the second clamping and supporting seat; the ventilation main body is tightly connected with the second clamping support seat through clamping the clamping heads on the second connecting lug and the sealing connecting lug.

The utility model also provides a tubular connecting furnace, which comprises a furnace body, a supporting tube and any one of the sealing devices; the supporting tube is connected to the furnace body in a penetrating mode, and the sealing device is arranged at the end portion, located outside the furnace body, of the supporting tube.

Preferably, the tube connecting furnace further comprises a cooling device sealed on the end of the support tube, a heat insulating device, a positioning device and a pressurizing device which are arranged in the support tube in sequence.

Preferably, the cooling device comprises a cooling housing; one end of the cooling seat body is provided with a connecting end extending towards the inside of the supporting tube, a first clamping and supporting seat of the sealing device is connected with the opposite other end of the cooling seat body, a positioning channel penetrating through the opposite two ends and the connecting end is arranged in the cooling seat body, and the positioning channel is connected with and communicated with a first positioning channel in the first clamping and supporting seat in parallel;

the cooling seat body is internally provided with a cooling loop which is isolated from the positioning channel and surrounds the positioning channel, and the cooling seat body is provided with a water inlet and a water outlet which are respectively communicated with the cooling loop.

The utility model discloses a sealing device for the tubular connection stove provides certain connecting pressure and guarantees the position precision that the cladding tube is connected, realizes on the port of end plug press fit to the cladding tube.

The tubular connecting furnace of the utility model is used for pressing the end plugs onto the cladding tube, and then the cladding tube and the end plugs (especially thin-wall SiC cladding long tubes and end plugs) can be successfully sintered and connected by heating and the like, thereby meeting the requirements of pressurization, positioning and high temperature required by connection, having no particularly complicated parts, having simpler part preparation process and low cost; the operation is simple, and the large-scale connection of the cladding long pipe is facilitated.

Drawings

The invention will be further explained with reference to the drawings and examples, wherein:

FIG. 1 is a block diagram of a tube-type connecting furnace according to an embodiment of the present invention;

FIG. 2 is a schematic sectional view of a tube-type connecting furnace (except for a furnace body) according to an embodiment of the present invention;

FIG. 3 is a schematic structural view of a pressurizing device in a tube connecting furnace according to an embodiment of the present invention;

fig. 4 is an exploded view of the pressurizing device shown in fig. 3.

Detailed Description

In order to clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

As shown in fig. 1 and 2, the tube connecting furnace according to an embodiment of the present invention is used for connecting a cladding tube and an end plug, and comprises a furnace body 1, a supporting tube 2 transversely penetrating into the furnace body 1, a cooling device 5 and a sealing device arranged at the end of the supporting tube 2, and a heat insulation device 4 sequentially arranged in the supporting tube 2. A positioning device 3 and a pressurizing device 8.

The opposite first and second ends of the support tube 2 may protrude from the opposite sides of the furnace body 1 to facilitate the assembly of the furnace and the related operations. The heat insulation device 4 is connected to one end of the positioning device 3 in the support tube 2, the cooling device 5 is connected to the heat insulation device 4 and sealed at a first end port of the support tube 2, and the pressurizing device 8 is located at the opposite end of the positioning device 3 in the support tube 2.

The sealing device may comprise a first sealing and clamping mechanism 6 and a ventilation mechanism 7 which are connected in sequence to the cooling device 5. Wherein, the ventilation mechanism 7, the first sealing and clamping mechanism 6, the cooling device 5 and the heat insulation device 4 are provided with positioning channels which are communicated in sequence and used for the penetration of the cladding tube 100, and the positioning device 3 is provided with a positioning groove 30 which is communicated with the positioning channels and used for the accommodation and positioning of the cladding tube 100; a compression device 8 presses the end plug 20 onto the port of the cladding tube 100 at the opposite end of the positioning device 3.

The support tube 2 is a tube body with two open ends, a first end of which is connected to a cooling device 5, a first sealing and clamping mechanism 6 and a ventilation mechanism 7 in sequence, and an opposite second end of which can be sealed by a flange (not shown).

Preferably, in this embodiment, the supporting tube 2 is a corundum tube.

The positioning device 3 includes a positioning base 31 and a positioning cover 32. The positioning base 31 extends in the axial direction of the support tube 2, and does not need to have the same length as the support tube 2, as long as it has a sufficient positioning length in the axial direction of the cladding tube 100. The positioning base 31 is located mainly at the middle position in the axial direction of the support tube 2. In addition, the cross section of the positioning base 31 is semicircular, the arc-shaped side surface is matched with the inner wall of the support tube 2, the plane opposite to the arc-shaped side surface is used for positioning the cladding tube 100, and the positioning groove 30 is arranged on the plane.

The positioning grooves 30 are provided on the positioning base 31 and extend in the axial direction of the positioning base 31, penetrating opposite ends of the positioning base 31. The positioning cover 32 is fitted over the positioning groove 30 and locked to the positioning base 31 by screws or the like, thereby locking the cladding tube 100 in position on the positioning base 31. Alternatively, the positioning cap 32 may extend in the axial direction of the positioning base 31, being as long as the positioning base 31; the positioning cover 32 may also be a cover body having a length smaller than the axial length of the positioning base 31, and may be one or more.

The positioning slot 30 may preferably be a V-shaped groove and the face of the positioning cap 32 that engages the groove may also have a V-shaped groove to limit the movement and rotation of the cladding tube 100 in the direction of axis X, Y.

The cladding tube 100 penetrates through the positioning channels in the ventilation mechanism 7, the first sealing and clamping mechanism 6, the cooling device 5 and the heat insulation device 4, enters the positioning grooves 30 on the support tube 2 and the positioning base body 31 along the positioning channels, faces the pressurizing device 8 at the end part and is butted with the end plug 200, the end plug 200 is stabilized on the port of the cladding tube 100 by applying pressure to the end plug 200 through the pressurizing device 8, and then the end plug 200 and the cladding tube 100 can be sintered and connected together through high-temperature heating by furnace operation. The pressure applied by the pressurizing device 8 can reach 0.01-1 MPa.

In particular, the pressure device 8 may comprise a force transfer block 81, a switching assembly arranged on one side of the force transfer block 81 and movable back and forth in a direction away from and towards the force transfer block 81. The conversion component is matched with the force transmission block 81 by an inclined surface, so that after the conversion component moves towards the direction close to the force transmission block 81, the force transmission block 81 is driven to move axially along the support pipe 2 by the inclined surface.

The force-transmitting block 81 may be a cylindrical structure, which is movably fitted on the plane of the positioning base 31, opposite to the positioning slot 30 and the cladding tube 100 therein. Furthermore, the force-transmitting block 81 can slide axially along the positioning base 31. An end face of one end of the force transfer block 81 (the end facing the cladding tube 100) forms an abutment face on which the end plug 200 is positioned; the conversion assembly provides a vertical pressure that is converted by the force transfer block 81 to a horizontal pressure applied to the end plug 200, pressurizing the end plug 200 to stabilize it on the port of the cladding tube 100.

The conversion assembly is located above the force transfer block 81, so that a downward pressing force can be applied to the force transfer block 81, and the force transfer block 81 is driven to move towards the cladding tube 100 through the inclined surface fit, so as to press the end plug 200.

In this embodiment, the inclined surface 811 of the force transfer block 81 is arranged at the opposite end of the force transfer block 81 (the end facing away from the end plug 200) and extends to the side thereof, facing the switch assembly. The ramp 84 of the conversion assembly is arranged on its end face facing the force transfer block 81.

The conversion assembly may include a conversion block 82 that cooperates with the inclined surface of the force transfer block 81, and a pressure block 83 that bears against the conversion block 82. The pressurizing block 83 and the converting block 82 provide pressure to the force transmitting block 81, convert vertical pressure into horizontal pressure through the inclined surface fit, and act on the end plug 200 through the force transmitting block 81.

The compression block 83 includes one or more compression beads, and may be fixedly or detachably disposed on the transition block 82. The conversion assembly or the pressure block 83 therein is made of a refractory metal such as tungsten, molybdenum, etc., which is resistant to high temperatures.

The conversion assembly further comprises an end cap 85 arranged at the opposite end of the force transfer block 81 (the end facing away from the end plug 200) and also at the side of the conversion assembly facing away from the insulation 4, engaging the end of the positioning base 31. The force transmission block 81 is not connected with the end cover 85, and an interval is reserved between the force transmission block 81 and the end cover to provide an abdicating space for the horizontal movement of the force transmission block 81.

The outer circumferential shape of the end cap 85 may be set to correspond to the inner circumferential shape of the support tube 2.

The surface of the end cover 85 facing the force transmission block 81 is provided with two convex columns 86 which are oppositely spaced, the space between the two convex columns 86 forms a guide groove, and the force transmission block 81 and the conversion component are both arranged in the guide groove. In particular, the force-transmitting piece 81 is positioned and guided in a guide groove, in which it can be moved along the positioning base 31 in the direction of the cladding tube 100.

The conversion component is mainly accommodated in the guide groove by the conversion block 82, and the pressurizing block 83 can protrude out of the guide groove. The end face of the conversion component facing the end cover 85 is in relatively slidable fit with the corresponding surface of the end cover 85, so that the conversion component can move up and down relative to the end cover 85 as a whole, and the force transmission block 81 is driven to move horizontally by the up and down movement relative to the end cover 85.

The heat insulation device 4 is opposite to the pressurizing device 8 and is positioned at the other end of the positioning device 3. The heat insulation device 4 is arranged in the first end of the supporting tube 2 and close to the port of the first end, so that the heat insulation effect is achieved, heat is transferred to devices such as the cooling device 5 outside the furnace body 1 when high-temperature heating is carried out in the furnace body 1, and the excessive loss of energy and high-temperature scalding caused by the outside of the tubular connecting furnace are prevented.

The thermal insulation device 4 comprises a thermal insulation body 41 disposed in the first end of the support tube 2 and extending axially along the support tube 2; one end of the heat insulating body 41 is connected to the positioning base 31, and the other end thereof is connected to the cooling device 5.

Wherein, the opposite ends of the heat insulation main body 41 may be respectively provided with steps protruding the circumference. The step at one end of the heat insulation main body 41 is matched with the positioning base body 31 and locked together through bolts and other parts; the step at the other end is matched with the cooling device 5 and locked together through bolts and the like.

The heat insulation main body 41 is provided with a positioning channel 40 penetrating through two opposite ends thereof, and the positioning channel 40 is connected and communicated with the positioning groove 30 in parallel.

The heat insulation body 41 is made of a heat insulation material.

The cooling device 5 is connected with the heat insulation device 4 and sealed on the first end port of the support tube 2, and further plays a role in cooling. The cooling device 5 may comprise a cooling housing 51 fitted over the first end port of the support tube 2. One end of the cooling seat body 51 is provided with a connection end 52 extending toward the inside of the support tube 2, and the connection end 52 is connected to the heat insulating main body 41 of the heat insulating device 4.

The cooling seat 51 is provided with a positioning channel 50 penetrating through its two opposite ends and the connecting end 52, and the positioning channel 50 is connected in parallel and communicated with the positioning channel 40 in the heat insulation device 4.

The cooling seat body 51 is internally provided with a cooling loop 53 isolated from the positioning channel 50, and the cooling loop 53 surrounds the positioning channel 50 and is used for cooling water to circulate in the cooling seat body 51 and the cladding tube 100 so as to perform the functions of cooling. The cooling base 51 is provided with a water inlet 54 and a water outlet 55 which are respectively communicated with the cooling loop 53 and are respectively used for inputting cooling water and discharging the cooling water.

At least one vent hole 56 is further provided on the connecting end 52 located inside the support tube 2, and the vent hole 56 communicates the positioning channel 50 inside the cooling seat body 51 and the inner space of the support tube 2.

Further, the cooling device 5 further includes a first sealing ear 57 disposed on a periphery of an end of the cooling housing 51 facing the support tube 2, a fixing ring 58 disposed on an outer periphery of the first end of the support tube 2, and a first clamping head 59.

The first sealing lug 57 further protrudes from the periphery of the support tube 2, the fixing ring 58 is engaged with the first sealing lug 57, and the first clamping head 59 is clamped on the first sealing lug 57 and the fixing ring 58 to cover the outer ends of the first sealing lug 57 and the fixing ring 58, thereby tightly sealing the cooling housing 51 on the port of the support tube 2. A sealing ring 510 is disposed between the first sealing ear 57 and the fixing ring 58 to further seal the gap therebetween.

The first chuck 59 is preferably a metal chuck.

In addition, the periphery of one end of the cooling seat 51 facing away from the support tube 2 (facing the first sealing and clamping mechanism 6) is provided with a protruding second sealing lug 511 for matching with the first sealing and clamping mechanism 6 to realize tight connection.

The first sealing and clamping mechanism 6 is connected with the cooling device 5, and is matched with the pressurizing device 8 and the positioning device 3, so that a certain connecting pressure is provided, and the position accuracy of the connection of the cladding tube 100 is ensured.

The first seal clamping mechanism 6 includes a first clamp support seat 61 closely interfacing with the cooling device 5, a first clamp ring 62 for closely fitting on the cladding tube 100, and a first clamp adjuster 63 connecting and adjusting a clamping degree of the first clamp ring 62. The first clamping support seat 61 is provided with a first positioning channel 60 penetrating through two opposite ends thereof, and the first positioning channel 60 is connected and communicated with the positioning channel 50 in the cooling device 5 in parallel.

The first clamp ring 62 is disposed in the positioning passage 60 in the first clamp support seat 61, and the first clamp adjuster 63 has one end penetrating into the first clamp support seat 61 to be connected to the first clamp ring 62 and the other end located outside (on the outer periphery) the first clamp support seat 61. The first clamping adjuster 63 may be an adjusting bolt, and the first clamping ring 62 may be tightly clamped to the cladding tube 100 or released from the cladding tube 100 by rotating the first clamping adjuster 63.

A first convex ring 64 matched with the second sealing lug 511 is arranged on the periphery of one end of the first clamping support seat 61 facing the cooling seat body 51; the second sealing lug 511 and the first protruding ring 64 are clamped by a clamping head (a second clamping head 65), the outer end parts of the second sealing lug 511 and the first protruding ring 64 are coated, and the cooling seat body 51 is tightly connected with the first clamping support seat 61. In addition, a sealing ring is arranged between the mating surfaces of the second sealing lug 511 and the first convex ring 64 to realize the gap sealing between the two.

The second chuck 65 is preferably a metal chuck.

The first clamping support seat 61 is provided with a second convex ring 66 at the periphery of one end facing the ventilation mechanism 7 (facing away from the cooling seat body 51) for matching with the corresponding component of the ventilation mechanism 7 to realize tight connection.

The first clamping support seat 61 is further provided with a gas channel 67 isolated from the first positioning channel 60, and the gas channel 67 is communicated with the positioning channel 50 in the cooling seat body 51.

The ventilation mechanism 7 is used for evacuating the space inside the support tube 2 or filling gas such as inert gas. The ventilation mechanism 7 may include a ventilation body 71 that is in close contact with the first sealing and clamping mechanism 6. The ventilation body 71 is provided with a chamber 70 therein, and the ventilation body 71 is provided with an air valve 72 communicating with the chamber 70.

The positioning passage of the ventilation mechanism 7 is formed in the chamber 70 and meets and communicates with the positioning passage 60 of the first seal clamping mechanism 6 in parallel. The chamber 70 is sequentially communicated with the gas flow passage 67 in the first clamping and supporting seat 61, the positioning passage 50 in the cooling seat body 51 and the vent hole 56 to form a ventilation passage communicated with the inner space of the supporting tube 2, and the ventilation mechanism 7 vacuumizes or inflates the inner space of the supporting tube 2 through the ventilation passage. The filling is mainly with an inert gas such as nitrogen or argon, etc., so that the cladding tube 100 and the end plug 200 are connected under an inert atmosphere.

The periphery of one end of the ventilation main body 71 facing the first sealing and clamping mechanism 6 is provided with a protruding first connecting lug 73. The first connecting lug 73 is matched with the second convex ring 66 on the first clamping support seat 61, and is clamped on the first connecting lug 73 and the second convex ring 66 through the third clamping head 74, so that the outer end parts of the first connecting lug 73 and the second convex ring 66 are coated, and the ventilation main body 71 is tightly connected with the first clamping support seat 61.

A sealing ring is arranged between the matching surfaces of the first connecting lug 73 and the second convex ring 66 to realize the gap sealing between the two.

For the ventilation body 71, the side of the ventilation body, which faces away from the first sealing and clamping mechanism 6, can be in a sealing arrangement, and a through hole communication chamber 70 corresponding to the positioning channel is arranged; alternatively, the chamber 70 extends through the ventilation body 71 on the side facing away from the first sealing and clamping mechanism 6.

Correspondingly, the utility model discloses in, sealing device still includes the sealed clamping mechanism 9 of second of connecting ventilation mechanism 7. The second sealing and clamping mechanism 9 is provided with a second positioning channel 90 for the penetration of the cladding tube 100, and is communicated with the positioning channel in the ventilation mechanism 7.

The second seal clamping mechanism 9 includes a second clamp support base 91 closely interfacing with the ventilation mechanism 7, a second clamp ring 92 for closely fitting on the cladding pipe 100, and a second clamp adjuster 93 connecting and adjusting a clamping degree of the second clamp ring 92. A second locating channel 90 is provided in the second clamp bearing 8 and extends through opposite ends thereof.

The second clamp ring 92 is disposed in the second positioning passage 90 in the second clamp support seat 91, and the second clamp adjuster 93 has one end penetrating into the second clamp support seat 91 to connect the second clamp ring 92 and the other end located outside (on the outer periphery) the second clamp support seat 91. The second clamping adjuster 93 may be an adjusting bolt, and the second clamping ring 92 may be tightly clamped to the cladding tube 100 or loosened from the cladding tube 100 by rotating the second clamping adjuster 93.

The periphery of one end of the second clamping support seat 91 facing the ventilation mechanism 7 is provided with a convex sealing connection lug 94, and the periphery of one end of the ventilation main body 71 facing the second clamping support seat 91 is provided with a convex second connection lug 75. The sealing engaging lug 94 is engaged with the second engaging lug 75, and is clamped between the sealing engaging lug 94 and the second engaging lug 75 by a clamping head (a fourth clamping head 95), so that the outer ends of the sealing engaging lug 94 and the second engaging lug 75 are covered, and the second clamping support seat 91 is tightly connected with the ventilation main body 71.

A sealing ring is further arranged between the matching surfaces of the sealing connecting lug 94 and the second connecting lug 75 to realize gap sealing between the two.

In addition, in the embodiment, as shown in fig. 2, the second clamping and supporting seat 91 includes a supporting seat 911 and a clamping end cap 912 fitted to a side of the supporting seat 911 facing away from the ventilation mechanism 7, so as to facilitate the mounting and dismounting and the penetration of the cladding tube 100. The support housing 911 and the clamping end cap 912 are also connected in a sealing manner by protruding connecting lugs and clamping heads.

The utility model discloses a tube connecting furnace is applicable to the connection of SiC cladding pipe and SiC end plug etc. realizes that cladding pipe 100 and end plug 200 connect under vacuum, air or protective atmosphere, and connection temperature can reach 1700 ℃, and connection pressure can reach 0.01-1 MPa.

Further, the utility model discloses a tubular connection stove is still including supporting at the supporting seat 10 of furnace body 1 below, still including setting up temperature sensor, temperature data collection station, temperature controller, step-down transformer, control panel etc. on furnace body 1, realizes corresponding operation and function.

The above only is the embodiment of the present invention, not limiting the patent scope of the present invention, all the equivalent structures or equivalent processes that are used in the specification and the attached drawings or directly or indirectly applied to other related technical fields are included in the patent protection scope of the present invention.

Claims (10)

1. A sealing device for a tube connecting furnace for connecting a cladding tube and an end plug, characterized in that the sealing device comprises a first sealing and clamping mechanism connected to the end of a support tube of the tube connecting furnace;

the first sealing and clamping mechanism comprises a first clamping and supporting seat, a first clamping ring and a first clamping and adjusting piece; a first positioning channel which penetrates through the two opposite ends of the first clamping support seat and is used for the cladding tube to penetrate through is arranged in the first clamping support seat; the first clamping ring is arranged in the positioning channel and is used for being tightly attached to the cladding tube; the first clamp adjustment member couples to and adjusts a clamping degree of the first clamp ring.

2. The seal of claim 1 wherein one end of said first clamp adjuster is threaded into said first clamp bearing to engage said first clamp ring and the other end of said first clamp adjuster is positioned outside said first clamp bearing.

3. The sealing device of claim 1 or 2, further comprising a second seal clamping mechanism;

the second sealing and clamping mechanism comprises a second clamping and supporting seat connected with the first clamping and supporting seat, a second clamping ring and a second clamping and adjusting piece;

a second positioning channel which penetrates through the two opposite ends of the second clamping and supporting seat and is used for the cladding tube to penetrate through is arranged in the second clamping and supporting seat; the second clamping ring is arranged in the second positioning channel and is used for being tightly attached to the cladding tube; the second clamp adjustment member is coupled to and adjusts a clamping degree of the second clamp ring.

4. A sealing device according to claim 3, wherein one end of the second clamping adjustment member is inserted into the second clamping support seat to connect with the second clamping ring, and the other end of the second clamping adjustment member is located outside the second clamping support seat.

5. The sealing device of claim 3, further comprising a venting mechanism;

the air exchange mechanism comprises an air exchange main body tightly connected between the first clamping support seat and the second clamping support seat; the ventilation body is internally provided with a cavity communicated with the first positioning channel and the second positioning channel, and the ventilation body is provided with an air valve communicated with the cavity.

6. The sealing device according to claim 5, wherein the ventilation body is provided with a first protruding connecting lug at a periphery of an end facing the first seal clamping mechanism, and the first clamp support seat is provided with a second protruding ring at a periphery of an end facing the ventilation body, wherein the second protruding ring is matched with the first connecting lug; the ventilation main body is tightly connected with the first clamping support seat through clamping the clamping heads on the first connecting lug and the second convex ring.

7. The sealing device according to claim 5, wherein the ventilation body is provided with a protruding second engaging lug at a periphery of an end facing the second seal clamping mechanism, and the second clamp support seat is provided with a seal engaging lug at a periphery of an end facing the ventilation body, wherein the seal engaging lug is engaged with the second engaging lug; the ventilation main body is tightly connected with the second clamping support seat through clamping the clamping heads on the second connecting lug and the sealing connecting lug.

8. A tube-type connecting furnace, characterized by comprising a furnace body, a supporting tube and a sealing device according to any one of claims 1 to 7; the supporting tube is connected to the furnace body in a penetrating mode, and the sealing device is arranged at the end portion, located outside the furnace body, of the supporting tube.

9. The tube connecting furnace of claim 8, further comprising a cooling device sealed on the end of the support tube, a heat insulating device, a positioning device, and a pressurizing device disposed in sequence inside the support tube.

10. The tube connecting furnace of claim 9, wherein the cooling device comprises a cooling housing; one end of the cooling seat body is provided with a connecting end extending towards the inside of the supporting tube, a first clamping and supporting seat of the sealing device is connected with the opposite other end of the cooling seat body, a positioning channel penetrating through the opposite two ends and the connecting end is arranged in the cooling seat body, and the positioning channel is connected with and communicated with a first positioning channel in the first clamping and supporting seat in parallel;

the cooling seat body is internally provided with a cooling loop which is isolated from the positioning channel and surrounds the positioning channel, and the cooling seat body is provided with a water inlet and a water outlet which are respectively communicated with the cooling loop.

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