A fireproof and heat-insulating ventilation duct for central air conditioning

Abstract

The present invention discloses a fireproof and heat-insulating ventilation duct for central air conditioning, and specifically relates to the technical field of ventilation ducts, including a main unit, a ventilation duct, and a mounting frame arranged on both sides of the ventilation duct; a splicing mounting unit, arranged on one side of the mounting frame, including three groups of limit blocks arranged at both ends of one side of a group of the mounting frames, and limit slides arranged at both ends of one side of another group of the mounting frames. The present invention adopts a mutually adaptive arrangement of the limit blocks on one side of the ventilation duct and the limit slides on the other side, so that when installing multiple groups of ventilation ducts, the two groups of ventilation ducts can be spliced ​​head to tail more quickly, and the splicing is more neat, and no offset occurs. At the same time, it is not necessary for the operator to screw multiple bolts for fixing, which simplifies the steps and difficulty of installation, and also improves the work efficiency of the operator.

Description

Technical Field

[0001] The invention relates to the technical field of ventilation ducts, and in particular to a fireproof and heat-insulating ventilation duct for a central air conditioner. Background Art

[0002] Ventilation ducts are metal or composite pipes used in ventilation and air-conditioning projects in industrial and civil buildings. They are a kind of municipal infrastructure designed to allow air circulation and reduce the concentration of harmful gases.

[0003] The Chinese patent with the authorization announcement number CN113137737A discloses a ventilation duct, which is a hollow quadrangular prism structure with two ends open as a whole, including an air inlet section, a diameter-changing section and an air outlet section arranged coaxially in sequence, the wind direction in the ventilation duct is from the air inlet section to the diameter-changing section and then to the air outlet section, the radial cross-sections of the air inlet section and the air outlet section are both rectangular, the diameter-changing section includes a first concave surface and a second concave surface arranged oppositely, the generatrix of the first concave surface and the generatrix of the second concave surface are axially symmetrical, the generatrix of the first concave surface is as follows: the diameter-changing section also includes a first convex surface and a second convex surface arranged oppositely, the generatrix of the first convex surface and the generatrix of the second convex surface are axially symmetrical. By reasonably setting the component structure, optimizing the generatrix of the first concave surface and the second concave surface, and cooperating with the first convex surface and the second convex surface, the boundary layer height at the maximum point of the variable diameter turbulence is reduced, the energy dissipation of the variable diameter is reduced, and the drag reduction rate can reach up to 50.61%; it fills the gap in the current research on the variable diameter structure of the ventilation duct, expands new ideas for the drag reduction of the ventilation system, and provides a new basis for the formulation of relevant manuals.

[0004] However, during the installation of the current ventilation ducts, it is necessary to connect multiple groups of ventilation ducts end to end and then fix the four corners with bolts. Moreover, since the general ventilation ducts are installed on the top of the house, it is inconvenient for operators to splice and align the multiple groups of ventilation ducts, which can easily cause the installation position to shift, and it is necessary to tighten multiple bolts to fix them, which makes the operation time-consuming and labor-intensive, increases the installation difficulty and workload of the operator, and also reduces the installation efficiency. Summary of the invention

[0005] The purpose of this section is to summarize some aspects of embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and the invention title of this application to avoid blurring the purpose of this section, the specification abstract and the invention title, and such simplifications or omissions cannot be used to limit the scope of the present invention.

[0006] In view of the above problems existing in the existing fireproof and heat-insulated ventilation ducts for central air conditioning, the present invention is proposed.

[0007] Therefore, the purpose of the present invention is to provide a fireproof and heat-insulating ventilation duct for central air conditioning. The problem to be solved is that the current ventilation ducts need to connect multiple groups of ventilation ducts end to end during installation, and then fix the four corners with bolts. Moreover, since general ventilation ducts are installed on the top of a house, it will be inconvenient for operators to splice and align the multiple groups of ventilation ducts, which may easily cause the installation position to shift, and multiple bolts need to be screwed to fix them, which makes the operation time-consuming and labor-intensive, increases the installation difficulty and workload of the operator, and also reduces the installation efficiency.

[0008] In order to solve the above technical problems, the present invention provides the following technical solutions: a fireproof and heat-insulating ventilation duct for a central air conditioner, comprising:

[0009] A main unit, comprising a ventilation duct and a mounting frame arranged on both sides of the ventilation duct;

[0010] A splicing installation unit is arranged on one side of the installation frame, including three groups of limit blocks arranged at both ends of one side of one group of the installation frames, limit slide grooves arranged at both ends of one side of the other group of the installation frames, positioning seats arranged at both ends of the ventilation duct close to one side of the limit slide groove, a threaded rod A arranged on one side of the positioning seat, and the threaded rod A passes through the positioning seat, a connecting plate arranged at one end of the threaded rod A, three groups of positioning blocks arranged on one side of the connecting plate, and the positioning blocks extend to the inner side of the limit slide groove, and a limiting component arranged in the inner cavity of the ventilation duct. By adopting the above technical solution, the two groups of ventilation ducts can be spliced ​​head to tail more quickly, and the splicing can be made more neat without offset. At the same time, it is not necessary for the operator to screw multiple bolts for fixing, which simplifies the steps and difficulty of installation and improves the work efficiency of the operator.

[0011] A sealing unit is arranged in the inner cavity of the ventilation duct, including a rectangular sealing strip arranged on one side of the inner cavity of the ventilation duct, and mounting seats arranged at the top and bottom ends of the inner side of the rectangular sealing strip. By adopting the above-mentioned technical scheme, the sealing performance of the connection between multiple groups of ventilation ducts can be improved, thereby ensuring the closed performance of multiple groups of ventilation ducts when in use.

[0012] As a preferred solution of the fireproof and heat-insulating ventilation duct for central air conditioning described in the present invention, it also includes a supporting unit, which is arranged in the inner cavity of the ventilation duct, including two sets of mounting bottom rods arranged in the inner cavity of the ventilation duct, a threaded rod B arranged at one end of the mounting bottom rod, a sleeve arranged on the surface of one end of the threaded rod B away from the mounting bottom rod, and a limiting base arranged at one end of the mounting bottom rod away from the threaded rod B and one end of the sleeve away from the threaded rod B. By adopting the above technical solution, the overall strength of the ventilation duct can be improved.

[0013] As a preferred solution of the fireproof and heat-insulating ventilation duct for central air conditioning described in the present invention, the limiting component includes: two groups of installation bins arranged at the top and bottom of the inner cavity of the ventilation duct close to one side of the rectangular sealing strip, sliding rods arranged at both ends of the inner cavity of the installation bins, a pull rod arranged on one side of the installation bins, and one end of the pull rod extends to the inner cavity of the installation bin, one end of the pull rod and one side of the mounting seat are connected to each other, a baffle is provided at one end of the pull rod located in the inner cavity of the installation bin, and the sliding rod passes through the baffle, a spring is arranged on the surface of the sliding rod, one end of the spring and one side of the inner cavity of the installation bin are connected to each other, and the other end of the spring and one side of the baffle are connected to each other, and a fixing component is arranged at the bottom of the baffle. By adopting the above-mentioned technical solution, the elastic force of the spring can be used to push the rectangular sealing strip on the pull rod to move between the two groups of spliced ​​ventilation ducts.

[0014] As a preferred solution of the fireproof and heat-insulating ventilation duct for central air conditioning described in the present invention, the fixing component includes: two groups of openings arranged at the bottom of the baffle, fixing bolts arranged at both ends of the top and bottom of the ventilation duct, and one end of the fixing bolt extends to the inner cavity of the installation bin, and a limit block is arranged at one end of the fixing bolt located in the inner cavity of the installation bin. By adopting the above-mentioned technical solution, the spring can be reset by twisting the fixing bolt, and the rectangular sealing strip can be automatically pushed to move.

[0015] As a preferred solution of the fireproof and heat-insulating ventilation duct for central air conditioning described in the present invention, two sets of auxiliary rods are provided at one end of the limit block close to the fixing bolt, and one end of the auxiliary rod passes through the installation bin and extends to the inside of the ventilation duct. By adopting the above-mentioned technical solution, the limit block can be limited to prevent the limit block from rotating when moving downward.

[0016] As a preferred solution of the fireproof and heat-insulating ventilation ducts for central air conditioning described in the present invention, two sets of sliding rails are arranged on one side of both ends of the ventilation duct, a slider is arranged on the inner side of the sliding rail, and the slider and one end of the connecting plate are connected to each other. The above-mentioned technical solution can improve the stability of the connecting plate during movement, and can also assist in limiting the connecting plate.

[0017] As a preferred solution of the fireproof and heat-insulating ventilation ducts for central air conditioning described in the present invention, wherein: the limit block is composed of a T-shape, the cross-section of the limit slide is composed of a T-shape, and the limit slide and the limit block are adapted to each other. The above-mentioned technical solution can make multiple groups of ventilation ducts more neat when spliced ​​together, and no offset will occur.

[0018] As a preferred solution of the fireproof and heat-insulating ventilation duct for central air conditioning described in the present invention, wherein: the inner wall of the ventilation duct is provided with an aluminum silicate fiberboard, and the surface of the ventilation duct is provided with multiple groups of reinforcing ribs. The above-mentioned technical solution can effectively improve the fireproof and heat-insulating capabilities of the ventilation duct, while making the device more stable, improving the overall strength, and not easily deformed.

[0019] As a preferred solution of the fireproof and heat-insulating ventilation duct for central air conditioning described in the present invention, wherein: an annular turning handle is provided at one end of the threaded rod A away from the connecting plate, and the surface of the annular turning handle is provided with anti-slip grooves. The above-mentioned technical solution is adopted to facilitate the rotation operation of the threaded rod A. The setting of the anti-slip grooves improves the comfort during hand-held rotation and avoids slipping during operation.

[0020] As a preferred solution of the fireproof and heat-insulating ventilation duct for central air conditioning described in the present invention, the limit block is composed of a U shape, and the pull rod is located on the inner side of the limit block. When the above-mentioned technical solution is adopted, while limiting the baffle, it avoids obstruction to the pull rod, thereby ensuring the subsequent normal operation of the pull rod.

[0021] In summary, the present invention includes at least one of the following beneficial effects:

[0022] 1. The present invention adopts a mutually adaptable arrangement of a limit block on one side of the ventilation duct and a limit slide groove on the other side, so that when installing multiple sets of ventilation ducts, two sets of ventilation ducts can be spliced ​​end to end more quickly, and the splicing can be more neat without offset. At the same time, it does not require operators to screw multiple bolts for fixing, which simplifies the steps and difficulty of installation and improves the work efficiency of operators.

[0023] 2. According to the present invention, after the multiple groups of ventilation ducts are spliced ​​and installed, the rectangular sealing strip is moved to the connection between the two groups of ventilation ducts, thereby improving the sealing of the connection between the multiple groups of ventilation ducts, thereby ensuring the closedness of the multiple groups of ventilation ducts when in use, avoiding the leakage of gas generated by the central air conditioner, and thus improving the practicality of the ventilation ducts.

[0024] 3. The present invention rotates the sleeve so that the bottom rod, the threaded rod B and the sleeve are supported obliquely in the inner cavity of the ventilation duct, thereby improving the strength of the ventilation duct and making the overall pressure-bearing strength better. A plurality of groups of reinforcing ribs are arranged on the surface of the ventilation duct to make the device more stable, improve the overall strength and prevent deformation. At the same time, the aluminum silicate fiberboard arranged on the inner wall of the ventilation duct can effectively improve the fireproof and heat-insulating capabilities of the ventilation duct. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0026] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0027] Figure 2 It is a bottom-up three-dimensional structural schematic diagram of the present invention;

[0028] Figure 3 is a side perspective cross-sectional view of the present invention;

[0029] Figure 4 is a three-dimensional cross-sectional view of the installation bin of the present invention;

[0030] Figure 5 For the present invention Figure 3 A magnified schematic diagram of part A.

[0031] Description of reference numerals:

[0032] 100, main unit; 101, ventilation duct; 102, installation frame; 200, splicing installation unit; 201, limit block; 202, limit slide groove; 203, positioning block; 204, connecting plate; 205, threaded rod A; 206, positioning seat; 207, slide rail; 208, slider; 300, sealing unit; 301, rectangular sealing strip; 302, mounting seat; 303, limit assembly; 303a, mounting bin; 303b, spring; 303c, slide rod; 303d, through port; 303e, baffle; 303f, limit block; 303g, pull rod; 303h, fixing bolt; 303i, auxiliary rod; 400, support unit; 401, mounting bottom rod; 402, threaded rod B; 403, sleeve; 404, limit base. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] The embodiment of the invention discloses a fireproof and heat-insulating ventilation duct for a central air conditioner.

[0035] Please refer to Figure 1-5As shown, a fireproof and heat-insulated ventilation duct for a central air conditioner comprises a main unit 100, comprising a ventilation duct 101, and a mounting frame 102 fixedly arranged on both sides of the ventilation duct 101;

[0036] The splicing installation unit 200 is arranged on one side of the installation frame 102, including three groups of limit blocks 201 fixedly arranged at both ends of one side of one group of installation frames 102, limit slide grooves 202 opened at both ends of one side of another group of installation frames 102, positioning seats 206 fixedly arranged at both ends of the ventilation duct 101 near one side of the limit slide grooves 202, threaded rods A205 threadedly connected to one side of the positioning seats 206, and the threaded rods A205 pass through the positioning seats 206, and the connecting plate 204 rotatably connected to one end of the threaded rods A205, and three groups of positioning blocks fixedly arranged on one side of the connecting plate 204 203, and the positioning block 203 extends to the inner side of the limiting slide groove 202, and the limiting component 303 is arranged in the inner cavity of the ventilation duct 101; through the mutually adaptive arrangement of the limiting block 201 on one side of the ventilation duct 101 and the limiting slide groove 202 on the other side, when installing multiple sets of ventilation ducts 101, the two sets of ventilation ducts 101 can be spliced ​​end to end more quickly, and the splicing can be more neat without offset, and at the same time, there is no need for the operator to tighten multiple bolts for fixing, which simplifies the installation steps and difficulty, and also improves the work efficiency of the operator.

[0037] The sealing unit 300 is arranged in the inner cavity of the ventilation duct 101, and includes a rectangular sealing strip 301 arranged on one side of the inner cavity of the ventilation duct 101, and mounting seats 302 arranged at both ends of the top and bottom of the inner side of the rectangular sealing strip 301. By moving the rectangular sealing strip 301 to the connection between two groups of ventilation ducts 101, the sealing of the connection between the multiple groups of ventilation ducts 101 can be improved, thereby ensuring the sealing of the multiple groups of ventilation ducts 101 when in use, preventing the gas generated by the central air conditioner from leaking, and thereby improving the practicality of the ventilation duct 101.

[0038] See also Figure 3 , further comprising a support unit 400, arranged in the inner cavity of the ventilation duct 101, comprising two sets of mounting bottom rods 401 arranged in the inner cavity of the ventilation duct 101, a threaded rod B402 fixedly arranged at one end of the mounting bottom rod 401, a sleeve 403 threadedly sleeved on the surface of one end of the threaded rod B402 away from the mounting bottom rod 401, and a limiting base 404 rotatably connected to one end of the mounting bottom rod 401 away from the threaded rod B402 and one end of the sleeve 403 away from the threaded rod B402. By rotating the sleeve 403, the mounting bottom rod 401, the threaded rod B402 and the sleeve 403 are supported in an inclined manner in the inner cavity of the ventilation duct 101, thereby improving the overall strength of the ventilation duct 101.

[0039] See also Figure 3-5The limiting component 303 includes: two groups of mounting chambers 303a fixedly arranged at the top and bottom of the inner cavity of the ventilation duct 101 near one side of the rectangular sealing strip 301, sliding rods 303c fixedly arranged at both ends of the inner cavity of the mounting chamber 303a, a pull rod 303g sleeved on one side of the mounting chamber 303a, and one end of the pull rod 303g extends to the inner cavity of the mounting chamber 303a, one end of the pull rod 303g is connected to one side of the mounting seat 302, one end of the pull rod 303g located in the inner cavity of the mounting chamber 303a is fixedly connected with a baffle 303e, and the sliding rod 303c penetrates the baffle 303e, a spring 303b sleeved on the surface of the sliding rod 303c, one end of the spring 303b is connected to one side of the inner cavity of the mounting chamber 303a, and the other end of the spring 303b is connected to one side of the baffle 303e, and a fixing component arranged at the bottom of the baffle 303e. The elastic force of the spring 303b facilitates pushing the rectangular sealing strip 301 on the pull rod 303g to move between the two groups of spliced ​​ventilation ducts 101.

[0040] See also Figure 3 and Figure 5 The fixing assembly includes: two groups of openings 303d opened at the bottom of the baffle 303e, fixing bolts 303h threadedly sleeved at both ends of the top and bottom of the ventilation duct 101, and one end of the fixing bolt 303h extending to the inner cavity of the installation chamber 303a, and a limit stopper 303f arranged at one end of the fixing bolt 303h located in the inner cavity of the installation chamber 303a. By turning the fixing bolt 303h, the spring 303b can be reset, automatically pushing the rectangular sealing strip 301 to move.

[0041] See also Figure 5 Two sets of auxiliary rods 303i are provided at one end of the limit stopper 303f near the fixing bolt 303h, and one end of the auxiliary rod 303i passes through the installation chamber 303a and extends to the inner side of the ventilation duct 101. When the fixing bolt 303h is rotated to drive the limit stopper 303f to move downward, the two sets of auxiliary rods 303i can limit the limit stopper 303f to prevent the limit stopper 303f from rotating when moving downward.

[0042] See also Figure 1-2 Two sets of slide rails 207 are arranged on one side of both ends of the ventilation duct 101, and a slider 208 is arranged inside the slide rail 207, and the slider 208 is connected to one end of the connecting plate 204. When the threaded rod A205 rotates to move the connecting plate 204, the slider 208 will be driven to slide inside the slide rail 207, thereby improving the stability of the connecting plate 204 when moving, and also assisting in limiting the connecting plate 204.

[0043] See also Figure 1-2The limiting block 201 is formed in a T-shape, the cross section of the limiting chute 202 is formed in a T-shape, and the limiting chute 202 and the limiting block 201 are adapted to each other. Since the limiting chute 202 and the limiting block 201 are adapted to each other in a T-shape, it is convenient for the limiting block 201 to slide inside the limiting chute 202, so that the multiple sets of ventilation ducts 101 are more neatly spliced ​​without offset.

[0044] See also Figure 1 The inner wall of the ventilation duct 101 is provided with an aluminum silicate fiberboard. The aluminum silicate fiberboard provided on the inner wall of the ventilation duct 101 can effectively improve the fireproof and heat-insulating capabilities of the ventilation duct 101. The surface of the ventilation duct 101 is provided with multiple groups of reinforcing ribs. By providing multiple groups of reinforcing ribs on the surface of the ventilation duct 101, the stability of the device is enhanced, the overall strength is improved, and deformation is not easy to occur.

[0045] See also Figure 1-2 The end of the threaded rod A205 away from the connecting plate 204 is provided with an annular handle, and the surface of the annular handle is provided with anti-skid patterns. The setting of the annular handle facilitates the rotation operation of the threaded rod A205, and the setting of the anti-skid patterns improves the comfort when holding and rotating, and prevents slipping during operation.

[0046] See also Figure 5 The limit stopper 303f is formed in a U shape, and the pull rod 303g is located on the inner side of the limit stopper 303f. When the baffle 303e is limited, the pull rod 303g is prevented from being blocked, so that the subsequent normal operation of the pull rod 303g is guaranteed.

[0047] The working principle of the fireproof and heat-insulating ventilation duct for central air conditioning provided by the present invention when in use: before installing the ventilation duct 101, first place two groups of mounting bottom rods 401 respectively into the inner cavity of the ventilation duct 101, and then rotate the sleeve 403 to make the sleeve 403 slide on the surface of the threaded rod B402, so that the limiting base 404 at one end of the sleeve 403 is pressed against one side of the top of the inner cavity of the ventilation duct 101, and at the same time, the limiting base 404 at one end of the mounting bottom rod 401 is pressed against one side of the bottom of the inner cavity of the ventilation duct 101, so that the mounting bottom rod 401, the threaded rod B402 and the sleeve 403 are supported obliquely in the inner cavity of the ventilation duct 101. When multiple groups of ventilation ducts 101 are to be installed, first fix one group of ventilation ducts 101 to the roof, and then fix one side of another group of ventilation ducts 101 on the mounting frame 102 The limiting block 201 is aligned with the two groups of limiting slide grooves 202 on the mounting frame 102 on one side of the ventilation duct 101 that is fixed, and the limiting block 201 is slid into the limiting slide groove 202, so that the two groups of ventilation ducts 101 are spliced ​​with each other, and then the threaded rods A205 on both sides of the ventilation duct 101 are rotated to push the sliders 208 on the connecting plate 204 to move along the inner side of the slide rail 207, and the connecting plate 204 is moved, and then the positioning block 203 is inserted into the inner side of the limiting slide groove 202, and the limiting block 201 on the inner side of the limiting slide groove 202 is blocked and limited, so that the two groups of ventilation ducts 101 can be quickly spliced ​​and installed, and there is no need for the operator to laboriously align the two groups of ventilation ducts 101 and then tighten the bolts for fixing, which greatly reduces the installation difficulty of the operator and improves the work efficiency;

[0048] When the multiple sets of ventilation ducts 101 are spliced ​​and installed, the two sets of fixing bolts 303h at the top and bottom of the ventilation ducts 101 can be screwed, and then the limit block 303f can be driven to move downward, and the auxiliary rod 303i will move downward and be inserted into the ventilation duct 101, and the limit block 303f will cancel the obstruction of the baffle 303e, and then the elastic force of the spring 303b will be used to drive the baffle 303e to pass through the limit block 303f through the opening 303d, thereby pushing the pull rod 303g to move, and the rectangular sealing strip 301 can be pushed to move to the connection between the two sets of ventilation ducts 101, thereby improving the sealing of the connection between the multiple sets of ventilation ducts 101, thereby ensuring the closedness of the multiple sets of ventilation ducts 101 when in use, avoiding the leakage of gas generated by the central air conditioner, and thus improving the practicality of the ventilation duct 101.

[0049] Finally, a few points should be explained: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, which may refer to mechanical connection or electrical connection, or internal communication between two components, or direct connection. "upper", "lower", "left", "right", etc. are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may change;

[0050] Secondly: In the drawings of the embodiments disclosed in the present invention, only the structures related to the embodiments disclosed in the present invention are involved, and other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of the present invention can be combined with each other;

[0051] Finally: The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A fireproof and heat-insulating ventilation duct for central air conditioning, characterized in that: include: A main unit (100) comprises a ventilation duct (101) and a mounting frame (102) arranged on both sides of the ventilation duct (101); A splicing installation unit (200) is arranged on one side of the installation frame (102), comprising three groups of limit blocks (201) arranged at both ends of one side of one group of the installation frames (102), limit slide grooves (202) arranged at both ends of one side of another group of the installation frames (102), positioning seats (206) arranged at both ends of the ventilation duct (101) near one side of the limit slide grooves (202), a threaded rod A (205) arranged on one side of the positioning seat (206), and the threaded rod A (205) passes through the positioning seat (206), a connecting plate (204) arranged at one end of the threaded rod A (205), three groups of positioning blocks (203) arranged on one side of the connecting plate (204), and the positioning blocks (203) extend to the inner side of the limit slide grooves (202), and a limit assembly (303) arranged in the inner cavity of the ventilation duct (101); A sealing unit (300) is arranged in the inner cavity of the ventilation duct (101), comprising a rectangular sealing strip (301) arranged on one side of the inner cavity of the ventilation duct (101), and mounting seats (302) arranged at both ends of the top and bottom of the inner side of the rectangular sealing strip (301); It also comprises a support unit (400) arranged in the inner cavity of the ventilation duct (101), comprising two sets of mounting bottom rods (401) arranged in the inner cavity of the ventilation duct (101), a threaded rod B (402) arranged at one end of the mounting bottom rod (401), a sleeve (403) arranged on the surface of an end of the threaded rod B (402) away from the mounting bottom rod (401), and a limiting base (404) arranged at an end of the mounting bottom rod (401) away from the threaded rod B (402) and an end of the sleeve (403) away from the threaded rod B (402); The limiting assembly (303) comprises: two groups of mounting chambers (303a) arranged at the top and bottom of the inner cavity of the ventilation duct (101) close to one side of the rectangular sealing strip (301), sliding rods (303c) arranged at both ends of the inner cavity of the mounting chambers (303a), and a pull rod (303g) arranged on one side of the mounting chamber (303a), wherein one end of the pull rod (303g) extends into the inner cavity of the mounting chamber (303a), and one end of the pull rod (303g) is aligned with one side of the mounting seat (302). interconnected, a baffle (303e) is provided at one end of the pull rod (303g) located in the inner cavity of the installation bin (303a), and the slide rod (303c) passes through the baffle (303e), a spring (303b) is provided on the surface of the slide rod (303c), one end of the spring (303b) and one side of the inner cavity of the installation bin (303a) are interconnected, and the other end of the spring (303b) and one side of the baffle (303e) are interconnected, and a fixing component is provided at the bottom of the baffle (303e); The fixing assembly comprises: two groups of through openings (303d) arranged at the bottom of the baffle (303e), fixing bolts (303h) arranged at both ends of the top and bottom of the ventilation duct (101), one end of the fixing bolt (303h) extending into the inner cavity of the installation chamber (303a), and a limit stopper (303f) arranged at one end of the fixing bolt (303h) located in the inner cavity of the installation chamber (303a).

2. The fireproof and heat-insulating ventilation duct for central air conditioning according to claim 1, characterized in that: Two groups of auxiliary rods (303i) are provided at one end of the limit stopper (303f) close to the fixing bolt (303h), and one end of the auxiliary rod (303i) passes through the installation chamber (303a) and extends to the inside of the ventilation duct (101).

3. The fireproof and heat-insulating ventilation duct for central air conditioning according to claim 2, characterized in that: Two sets of slide rails (207) are provided on one side at both ends of the ventilation duct (101), a sliding block (208) is provided on the inner side of the sliding rail (207), and the sliding block (208) and one end of the connecting plate (204) are connected to each other.

4. The fireproof and heat-insulating ventilation duct for central air conditioning according to claim 3 is characterized in that: The limiting block (201) is in a T-shape, the cross section of the limiting sliding groove (202) is in a T-shape, and the limiting sliding groove (202) and the limiting block (201) are adapted to each other.

5. The fireproof and heat-insulating ventilation duct for central air conditioning according to claim 4, characterized in that: An aluminum silicate fiberboard is provided on the inner wall of the ventilation duct (101), and a plurality of groups of reinforcing ribs are provided on the surface of the ventilation duct (101).

6. The fireproof and heat-insulating ventilation duct for central air conditioning according to claim 5, characterized in that: An annular turning handle is provided at one end of the threaded rod A (205) away from the connecting plate (204), and the surface of the annular turning handle is provided with anti-slip grooves.

7. The fireproof and heat-insulating ventilation duct for central air conditioning according to claim 6, characterized in that: The limit stopper (303f) is U-shaped, and the pull rod (303g) is located on the inner side of the limit stopper (303f).

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