Smoke exhaust flue structure and manufacturing process

Abstract

The invention discloses a smoke exhaust flue structure which comprises a main smoke flue, at least two air inlets are formed in a panel on one side of the main smoke flue, each air inlet is provided with a circular cover plate or a check valve in a replaceable mode, the air inlets are circular holes, the check valves are provided with smoke channels for smoke to pass through, and the smoke channels are communicated with the main smoke flue. A turnover plate capable of turning over is mounted in the flue gas channel, flue gas is introduced when the turnover plate is opened, and the flue gas in the main flue gas channel is prevented from flowing back when the turnover plate is closed; a flue gas channel of the check valve is cylindrical; an internal thread is arranged on the inner side wall of the circular hole of the air inlet; the outer side wall of the circular cover plate is provided with a first outer thread of which the diameter is matched with that of the inner thread on the inner side wall of the air inlet; a second external thread matched with the internal thread on the inner side wall of the air inlet is arranged on the outer side wall of the cylindrical smoke channel of the check valve. And by adopting the mode that the external threads are connected with the internal threads, mounting and dismounting of the cover plate, the check valve and the air inlet are more convenient.

Description

Technical Field

[0001] The present application belongs to the technical field of smoke exhaust ducts, and specifically, relates to a smoke exhaust duct structure, and in particular, to an air inlet structure of a smoke exhaust duct, and also to a manufacturing process of the above-mentioned smoke exhaust duct. Background Art

[0002] At present, the exhaust ducts used in kitchens and bathrooms of various types of multi-story residential buildings generally include a main exhaust duct for each household, and the main exhaust duct is provided with an air inlet connected to the exhaust equipment. The main exhaust ducts of residents on different floors are connected to each other to form a common exhaust duct, which eventually leads to the roof. The smoke of each household is discharged into the main exhaust duct by the exhaust equipment and then discharged to the roof through the common exhaust duct. The main exhaust duct is a hollow cavity with open upper and lower ends. In the past, there was only one high-position air inlet on the general exhaust duct, which was used to connect with the exhaust pipe of the high-position wall-mounted exhaust equipment.

[0003] Recently, with the advancement of technology, range hoods close to kitchen gas stoves have appeared, such as "integrated stoves". Their installation position is relatively low, and when connected to the high air inlet of the exhaust duct in the past, a relatively long exhaust pipe will be exposed. First, it is difficult to decorate, and second, there is a safety hazard because the exhaust pipe is too long. In order to solve the above technical problems, applications for exhaust ducts with multiple air inlets have been applied for. Users can choose to open air inlets in different positions for connecting equipment according to the purchased range hood equipment, which solves the problem that the exhaust pipe of the wall-mounted exhaust equipment located at a high position needs to be connected to the high air inlet, and the exhaust pipe of the range hood equipment located at a low position, such as the integrated stove, needs to be connected to the low air inlet.

[0004] However, these multiple air inlets at different heights should be repeatedly and selectively usable, because if the original range hood in this house is wall-mounted, its exhaust pipe is connected to the high-position air inlet of the exhaust duct, and the current or new residents may need to replace it with an integrated stove, and its exhaust pipe should be connected to the low-position air inlet of the exhaust duct, so the two air inlets at different heights should be able to repeatedly and selectively open any one of them and close the other unused air inlet. Some can also install a check valve on the opened air inlet to prevent the backflow of smoke in the shared exhaust duct.

[0005] In the above scheme, a plurality of different air inlets are arranged on the smoke exhaust duct, and it is necessary to install components such as covers on the air inlets that are not used for ventilation, so as to block the unventilated and unused air inlets. In order to realize the detachable installation of the covers on the smoke exhaust duct, some schemes have been proposed. For example, in some schemes, covers fastened with screws are used to close the unused air inlets. If screws are used for installation, flange interfaces need to be installed at the air inlets, and a plurality of screw holes need to be provided on the flange structure for installing the covers, which results in problems of complicated installation and poor sealing. For example, in some other schemes, buckles are used to install the covers, and the buckles are generally only provided one each on the left and right positions, and the buckles are generally stretched with fine wire springs, which results in problems of complicated installation and poor sealing.

[0006] In addition, the cover plate in the above scheme is generally made of fire-proof and durable metal plate, which is costly, difficult to install and affects the integrity and consistency of the quality of the smoke exhaust duct; the smoke exhaust duct in the above method is cast with slurry, and the cover plate is a metal plate, which will cause the smoke exhaust duct and the cover plate to be made of different materials, resulting in different lifespans of the cover plate and the smoke exhaust duct, or the lifespan of the cover plate will be lower than that of the smoke exhaust duct, which will cause problems such as air leakage at the cover plate seal.

[0007] In view of this, this application is specially filed. Summary of the invention

[0008] The technical problem to be solved by the present application is to overcome the deficiencies of the prior art, and the purpose is to provide a smoke exhaust duct, by pre-setting air inlets of different heights on the exhaust duct, and using the air inlets of different heights to install corresponding cover plates or check valves respectively, so as to achieve the purpose of adapting the smoke exhaust duct to different usage conditions; at the same time, the present application also provides a smoke exhaust duct, so that the air inlet of the smoke exhaust duct can be directly integrated with the detachable assembly structure of other components; and the present application also provides a smoke exhaust duct, so as to achieve the purpose of replaceably installing different functional components on the air inlet.

[0009] In order to solve the above technical problems, the basic concept of the technical solution adopted in this application is:

[0010] A smoke exhaust duct structure comprises a main smoke duct, and at least two air inlets are formed on a side panel of the main smoke duct, wherein at least one air inlet is located at a position above 1 / 2 of the height of the main smoke duct, and at least one air inlet is located at a position below 1 / 2 of the height of the main smoke duct, and a circular cover plate or a check valve is replaceably installed at at least one air inlet, the air inlet is a circular hole, the check valve is provided with a smoke channel for passing smoke, and a reversible flap is installed in the smoke channel, the flap allows smoke to pass when open, and prevents smoke in the main smoke duct from flowing back when closed; the smoke channel of the check valve is cylindrical; an inner thread is provided on the inner side wall of the circular hole of the air inlet; a first outer thread with a diameter matching the inner thread on the inner side wall of the air inlet is provided on the outer side wall of the circular cover plate; a second outer thread matching the inner thread on the inner side wall of the air inlet is provided on the outer side wall of the cylindrical smoke channel of the check valve.

[0011] Furthermore, the circular air inlet is a circular variable-diameter air inlet, and the inner thread on its inner wall is a variable-diameter inner thread whose diameter gradually decreases from the outer port to the inner port; the circular cover plate is a circular variable-diameter cover plate, and the first outer thread on its outer wall is a first variable-diameter outer thread whose diameter gradually decreases from the root to the end, and the first variable-diameter outer thread on the outer wall of the circular variable-diameter cover plate matches the variable-diameter inner thread of the circular variable-diameter air inlet, and is used to engage the detachable thread of the circular variable-diameter cover plate with the variable-diameter air inlet; the second outer thread on the outer wall of the smoke channel of the check valve is a second variable-diameter outer thread whose diameter gradually decreases from the root to the end, and the second variable-diameter outer thread matches the variable-diameter inner thread of the variable-diameter air inlet, and is used to engage the detachable thread of the check valve with the variable-diameter air inlet.

[0012] Furthermore, the material of the circular cover plate and the circular variable diameter cover plate is the same as, or partially the same as, the material of the main smoke duct of the smoke exhaust duct; preferably, the cover plate and the main smoke duct are cast by slurry of the same material; the slurry includes but is not limited to one or more combinations of the following: concrete, cement, gypsum, magnesium oxychloride cement and the like; preferably, the cover plate and the main smoke duct are cast by slurries of different proportions and / or different grades.

[0013] Furthermore, a shaft rod is provided on the flap; at least one small hole is provided on the inner wall of the cylindrical shell; the diameter of the mounting hole is greater than or equal to the diameter of the shaft rod, and the shaft rod is inserted into the mounting hole to flip the flap in the smoke channel for opening and closing the smoke channel; preferably, a radially protruding or radially concave porous ring is provided on the inner wall of the cylindrical shell, and at least one small hole is provided on the porous ring for rotatable plug-in installation of the shaft rod; optionally, the flap is installed on the smoke channel via a ring bearing.

[0014] Furthermore, the shaft rod comprises a left shaft rod and a right shaft rod; the left shaft rod and the right shaft rod are connected by a sleeve; the sleeve is arranged on the flap, a spring is arranged in the sleeve, and the left and right shaft rods adjust the spacing by the spring; the left and right shaft rods are respectively provided with a left handle and a right handle; the left and right handles are used to squeeze the springs, so that the ends of the left and right shaft rods can be telescopically plugged into the corresponding small holes; preferably, the diameter of the small holes arranged on the inner side wall of the smoke channel or the porous ring is larger than the diameter of the shaft rod of the flap; preferably, the shaft rod of the flap is divided into a left shaft rod and a right shaft rod, and a spring is arranged between the left and right shaft rods, which is used to move the left and right shaft rods relatively closer or farther away, and the ends of the left and right shaft rods can be telescopically inserted into the corresponding small holes.

[0015] Furthermore, the circular cover plate is installed on the air inlet via a reducing ring; the outer wall of the reducing ring is provided with an installation outer thread, and the inner wall is provided with an installation inner thread, the installation outer thread matches the inner thread of the inner wall of the air inlet, and the installation inner thread matches the first outer thread of the outer wall of the circular cover plate, or the second outer thread of the outer wall of the check valve, for a detachable connection in which the reducing ring is meshed with the inner thread of the air inlet via the installation outer thread, the first outer thread of the circular cover plate is meshed with the installation inner thread of the reducing ring, and the second outer thread of the check valve is meshed with the installation inner thread of the ring; preferably, a handle is provided on the side of the circular cover plate facing the smoke exhaust airway portion, and the handle is an inner concave handle or an outer convex handle.

[0016] The present application also discloses a manufacturing process of a smoke exhaust duct, which comprises the following steps:

[0017] S1. Making a prefabricated block containing the air inlet;

[0018] S2. Build a mold for the smoke exhaust duct;

[0019] S3. Fixing the prefabricated block in the mold of the smoke exhaust duct, pouring slurry into the mold of the smoke exhaust duct, or applying slurry, and demolding the slurry after solidification to form the main smoke duct of any of the above-mentioned smoke exhaust ducts;

[0020] Preferably, the slurry for making the prefabricated blocks in step S1 and the slurry for making the main flue gas duct in step S2 are composed of cements of the same or different grades and / or the same or different proportions.

[0021] Further, the step of S1. making a prefabricated block containing the air inlet is specifically as follows:

[0022] S11. Fixing the outer frame of the prefabricated block mold, the inner diameter of the outer frame of the prefabricated block mold is smaller than the width of the exhaust duct panel and larger than the inner diameter of the exhaust duct inlet, and the outer frame of the prefabricated block mold is any one of square, circular or irregular shapes;

[0023] S12. The cover plate model with an outer thread is placed in the middle of the outer frame and fixed, and the cover plate model is set in the same shape as the cover plate;

[0024] S13. Then inject the slurry into the space between the cover plate model and the outer frame, vibrate and compact the injected slurry, and after the slurry solidifies, rotate the cover plate model in the opposite direction to unscrew it, so as to form a prefabricated block with an air inlet with an inner thread.

[0025] Further, the S2. includes the following,

[0026] S21. The outer mold and the inner mold of the exhaust duct mold are fixedly installed inside and outside, the upper section and the lower section of the same side of the outer mold are respectively provided with outer circular holes, the diameter of the outer circular holes is matched with the air inlet provided on the prefabricated block, the upper section and the lower section of the inner mold are respectively provided with inner circular holes, and the inner circular holes and the outer circular holes are provided oppositely on the same horizontal line with the centers of the two circles being arranged;

[0027] Further, the S3. includes the following,

[0028] S31. Install and fix two prefabricated blocks between the constructed outer mold and the inner mold, so that the air inlets of the two prefabricated blocks correspond to the outer circular holes set at the upper and lower sections of the outer mold, and the air inlets of the two prefabricated blocks correspond to the inner circular holes set at the upper and lower sections of the inner mold.

[0029] The present application also discloses a manufacturing process for a smoke exhaust duct, which is characterized by:

[0030] The outer mold and the inner mold of the exhaust duct mold are fixedly installed inside and outside the mold, the upper section and the lower section on the same side of the outer mold are respectively provided with outer circular holes, and the upper section and the lower section on the same side of the inner mold are respectively provided with inner circular holes, and the inner circular holes and the outer circular holes are provided with their centers on the same horizontal line.

[0031] A detachable cover plate model is installed between the outer circular hole of the outer mold and the inner circular hole of the inner mold, and the outer peripheral wall of the cover plate model has an inner thread;

[0032] The slurry is poured between the outer mold and the inner mold. After the slurry solidifies, it is demoulded to form the main smoke duct of any of the above-mentioned smoke exhaust ducts. After the cover plate model is disassembled, the air inlet of the smoke exhaust duct is formed.

[0033] The present application also discloses a manufacturing process of a smoke exhaust duct, which comprises:

[0034] The outer mold and the inner mold of the exhaust duct mold are fixedly installed inside and outside the mold, the upper section and the lower section on the same side of the outer mold are respectively provided with outer circular holes, and the upper section and the lower section on the same side of the inner mold are respectively provided with inner circular holes, and the inner circular holes and the outer circular holes are provided with their centers on the same horizontal line.

[0035] An annular mounting flange is fixedly installed between the outer circular hole of the outer mold and the inner circular hole of the inner mold, and the inner peripheral wall of the annular mounting flange has an inner thread;

[0036] The slurry is poured between the outer mold and the inner mold, and after the slurry solidifies, it is demoulded to form the main smoke duct of any of the above-mentioned smoke exhaust ducts. The annular mounting flange is embedded and fixed on the smoke exhaust duct, and the interior of the annular mounting flange forms the air inlet of the smoke exhaust duct.

[0037] The following beneficial effects are achieved by adopting the technical solution described in the present application: the present application provides at least two different air inlets at intervals in the smoke exhaust channel, and the cover plate and the check valve can be arranged in different air inlets, which is suitable for different smoke exhaust environments, and is convenient for users to install smoke exhaust equipment at different air inlet positions as needed. In addition, by installing different cover plates or check valves at the first air inlet and the second air inlet, it is more convenient for users to install smoke exhaust equipment at different heights. In particular, by adopting the method of connecting the outer thread and the inner thread to each other, it is more convenient to install and remove the cover plate and the check valve from the air inlet.

[0038] Furthermore, in the present application, by setting the air inlet in a variable diameter manner, the weight of the cover plate or the check valve can be reduced, making it easier to install and disassemble the device.

[0039] At the same time, using the same material for the cover and the flue not only reduces the cost of the cover, but also ensures the same quality and life of all parts of the exhaust system, making it easier to manufacture the exhaust duct without changing the material, thereby minimizing costs.

[0040] At the same time, the application has a simple structure and significant effect, indicating that it can be promoted and used.

[0041] The specific implementation methods of the present application are further described in detail below in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] The accompanying drawings are part of this application and are used to provide a further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application, but do not constitute an improper limitation on this application. Obviously, the drawings described below are only some embodiments. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0043] Figure 1 : A three-dimensional schematic diagram of the main flue gas duct of this application;

[0044] Figure 2 : A cross-sectional view of the circular cover plate of the present application;

[0045] Figure 3 : Left view of the circular cover plate of the present application;

[0046] Figure 4 : A cross-sectional view of the check valve of the present application;

[0047] Figure 5 : An enlarged cross-sectional view of the check valve of the present application;

[0048] Figure 6 : An enlarged left view of the check valve of the present application;

[0049] Figure 7 : Schematic diagram of explosion installation of the main flue gas duct of this application;

[0050] Figure 8 : A cross-sectional diagram of the application showing a state in which a check valve is installed on the upper air inlet and the lower air inlet is screwed and sealed by a circular cover plate;

[0051] Fig. 9 : A cross-sectional schematic diagram of the state in which the upper air inlet of the present application is screwed and sealed by a circular cover plate and a check valve is installed at the lower air inlet;

[0052] Fig.10 : A cross-sectional schematic diagram of the application in which both upper and lower air inlets are screwed and sealed by circular cover plates;

[0053] Fig.11 :for Figure 8 A local enlarged schematic diagram of X;

[0054] Fig.12 :for Figure 8 A local enlarged schematic diagram of the Y position;

[0055] Fig.13 : A cross-sectional view of a variable diameter circular cover plate matching with a variable diameter circular ring of the present application;

[0056] Fig.14 : A cross-sectional view of the variable diameter air inlet of the present application;

[0057] Fig.15 : A cross-sectional view of the variable diameter circular cover plate of the present application being screwed and installed on the variable diameter air inlet of the smoke exhaust duct;

[0058] Fig.16 : A cross-sectional view of a circular cover plate matching a reducing ring in the present application;

[0059] Fig.17 : A cross-sectional view of the variable diameter ring at the air inlet of the present application;

[0060] Fig.18 : Left view of the variable diameter ring of the present application;

[0061] Fig.19 : A cross-sectional view of the prefabricated block of the present application;

[0062] Fig. 20 : A cross-sectional view of a prefabricated block according to another embodiment of the present invention;

[0063] Fig.21 : A cross-sectional view of the assembly of the mold and prefabricated blocks of the smoke exhaust duct of the present application;

[0064] Fig. 22 : A partial cross-sectional view of the mold of the smoke exhaust duct of the present application;

[0065] Fig.23 : Front view of the outer mold of this application;

[0066] Fig.24 : Rear view of the mold in this application;

[0067] Fig.25 : A partial cross-sectional view of a mold of another smoke exhaust duct of the present application;

[0068] Fig.26 : A partial cross-sectional view of a mold of a smoke exhaust duct in another embodiment of the present application;

[0069] Fig. 27 : A partial cross-sectional view of the assembly of the mold and prefabricated block of another method of the smoke exhaust duct of the present application;

[0070] Fig.28 : A partial cross-sectional view of the assembly of the mold and prefabricated block of the smoke exhaust duct in another embodiment of the present invention;

[0071] Fig.29 : A partial cross-sectional view of the assembly of the mold and prefabricated block of the smoke exhaust duct in another embodiment of the present invention;

[0072] Fig.30 : A schematic diagram of the structure of the prefabricated block mold of the present application;

[0073] Description of the main components in the figure:

[0074] 1. Main flue gas duct; 2. Upper air inlet; 2a. Upper variable diameter air inlet; 3. Internal thread; 3a. Variable diameter internal thread; 4. Panel; 5. Lower air inlet; 5a. Lower variable diameter air inlet; 6. Round cover; 6a. Round variable diameter cover; 7. Recessed handle; 7a. Protruding handle; 8. First external thread; 8a. First variable diameter external thread; 9. Check valve; 10. Second external thread; 11. Smoke channel; 12. Flap; 13. Shaft; 13a. Left shaft; 13b. Right shaft; 14. Check valve air inlet interface; 15. Sleeve Tube; 16, porous ring; 17, small hole; 18, left handle; 19, right handle; 20, spring; 21, recessed ring; 22, reducing ring; 221, installation inner thread; 222, installation outer thread; 40, prefabricated block; 41, cover plate model; 42, installation cylinder; 43, outer frame; 48, steel bar; 49, groove; 50, outer mold; 51, inner mold; 50a, inner folding edge; 51a, inner folding edge; 50b, outer folding edge; 51b, outer folding edge; 501, outer circular opening; 511, inner circular opening.

[0075] It should be noted that these drawings and textual descriptions are not intended to limit the conceptual scope of the present application in any way, but rather to illustrate the concepts of the present application for those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0076] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. The following embodiments are used to illustrate the present application but are not used to limit the scope of the present application.

[0077] In the description of the present application, it should be noted that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present application.

[0078] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0079] like Figures 1 to 18As shown, an embodiment of the present application introduces a smoke exhaust duct structure, including a main smoke duct 1 composed of at least one panel 4, or composed of at least one panel 4 and other fixed walls, and the main smoke duct 1 is a hollow cavity with open ends at the upper and lower ends; in this embodiment, the following specific method is used as an example to discuss: the main smoke duct 1 can be composed of panels arranged on the four vertical sides of the left, right, front and rear, which are spliced ​​in sequence to form a hollow cavity extending vertically up and down and open at both ends. At the same time, at least two openable air inlets for guiding external smoke into the main smoke duct 1 are provided on the panel 4 on one side of the main smoke duct, which are located at different heights above and below, wherein at least one air inlet is an upper air inlet 2 located above 1 / 2 of the height of the main smoke duct 1, and at least one air inlet is a lower air inlet 5 located below 1 / 2 of the height of the main smoke duct 1.

[0080] In the embodiment of the present application, the smoke exhaust duct structure also includes the following matching accessories: at least one circular cover plate 6 and a check valve 9. The upper air inlet 2 and the lower air inlet 5 are both circular holes, and the check valve 9 is provided with a smoke passage 11 for passing smoke, and a flap 12 is installed in the smoke passage 11. The flap 12 allows smoke to pass when it is opened, and prevents smoke in the main smoke duct 1 from flowing back out when it is closed. The smoke passage 11 for passing smoke is cylindrical, and a shaft 13 that can make the flap flip up and down is provided on the flap 12. The shaft 13 is located at a position slightly above the center of the flap 12, so that the flap 12 can be flipped downward to a vertical position under the action of the gravity of its own center eccentric to the shaft, thereby driving the flap 12 to remain in a closed state of closing the main smoke duct 1 under normal conditions.

[0081] In the embodiment of the present application, inner threads 3 are respectively arranged on the inner side walls of the circular holes of the upper air inlet 2 and the lower air inlet 5, and a first outer thread 8 whose diameter matches the inner thread 3 on the inner side wall of the upper air inlet 2 or the lower air inlet 5 is arranged on the outer side wall of the circular cover plate 6. A handle is arranged on the circular cover plate 6, and the circular cover plate 6 can be rotated by the handle to make the first outer thread 8 combine with the inner thread 3 on the inner side wall of the air inlet, and the circular cover plate 6 is screwed on the air inlet to seal the air inlet; the circular cover plate 6 can also be rotated in the opposite direction to remove the circular cover plate 6 and open the air inlet. Of course, two circular cover plates 6 can also be used to seal the upper air inlet 2 and the lower air inlet 5 respectively. The inside of the check valve 9 forms a cylindrical smoke passage 11, and a check valve air inlet interface 14 is provided at one end. The check valve air inlet interface 14 is used to connect and communicate with the end of the smoke duct of the smoke exhaust device; the outer wall of the cylindrical smoke passage 11 is provided with a second outer thread 10 that matches the inner thread 3 on the inner wall of the upper air inlet 2 and the lower air inlet 5, and the check valve 9 can be rotated to make its second outer thread 10 combine with the inner thread 3 on the inner wall of the air inlet; the check valve 9 can also be screwed and installed on the upper air inlet 2 or the lower air inlet 5; the check valve 9 can also be rotated in the opposite direction to remove it. In this way, when the main smoke duct 1 of the smoke exhaust duct is made, various configurations can be made for the upper air inlet 2 and the lower air inlet 5, and after the circular cover plate 6 or the check valve 9 is installed by threaded engagement of the inner and outer threads, the smoke exhaust duct is installed in the kitchen for residents to choose to use.

[0082] like Figures 7 to 10 As shown, this embodiment introduces a smoke exhaust duct structure. After various configurations are made to the upper air inlet 2 and the lower air inlet 5 of the main smoke duct 1 of the smoke exhaust duct, users can have multiple choices for use. The specific solutions are as follows:

[0083] One is like Figure 8 As shown, the lower air inlet 5 can be screwed and sealed with a circular cover plate 6, and a check valve 9 can be installed on the upper air inlet 2, which can be used to exhaust smoke after being connected to a high-level smoke extraction device selected by the user, such as a wall-mounted smoke extraction device.

[0084] Second, if Fig. 9 As shown, the upper air inlet 2 can also be screwed and sealed with a circular cover plate 6, and a check valve 9 can be installed on the lower air inlet 5, which can be used to exhaust smoke after being connected to a smoke exhaust device such as an integrated stove installed at a low position selected by the user.

[0085] The third is Fig.10 As shown, two circular cover plates 6 can be used to seal the upper air inlet 2 and the lower air inlet 5 respectively, so that the user can selectively open the circular cover plates 6 on the upper air inlet 2 or the lower air inlet 5 and install the self-selected check valve 9. Due to the use of the rotating circular cover plate 6 and the check valve 9, it is very convenient to install, remove, replace and reuse without any tools.

[0086] In this embodiment, a handle is provided on the circular cover plate 6, which facilitates the installation of the circular cover plate 6 so that the circular cover plate 6 can better fit the edge of the air inlet to form a tight seal to prevent gas or smoke leakage. The circular design itself has a smooth contour, which reduces the leakage points and improves the sealing effect. The handle design allows the circular cover plate 6 to be easily opened and closed without additional tools or complicated operations. Figure 2 As shown, the handle is provided as a recessed handle 7, the outer side surface of the circular cover plate 6 is provided with a recessed portion recessed inwardly, a convex portion protruding outwardly is provided in the recessed portion, and the convex portion is still in the recessed portion, so that the convex portion and the recessed portion cooperate to form a recessed handle 7; it is also possible, as Fig.13 As shown, the handle is configured as a protruding handle 7 a , which is disposed on the outer side of the circular cover plate 6 and is directly constituted by a convex portion protruding outward from the outer side of the circular cover plate 6 .

[0087] In the embodiment of the present application, a circle of recessed ring 21 protruding radially outward is provided on the side of the air inlet of the panel 4 facing the outside of the flue, which is used to cooperate with the radially protruding ring of the handle provided at the end of the circular cover plate 6, so that the outer end surface of the circular cover plate 6 is flush with the panel 4, so as to achieve the effect of hidden installation of the cover plate at the air inlet.

[0088] Embodiment 1

[0089] like Figures 13 to 15 As shown, in this embodiment, the circular upper air inlet 2 is a circular upper variable diameter air inlet 2a, and / or the circular lower air inlet 5 is a circular lower variable diameter air inlet 5a, and the inner thread 3 on the inner wall is a variable diameter inner thread 3a, and the diameter of the variable diameter inner thread 3a gradually decreases from the outer opening to the inner opening; the above-mentioned outer opening is the end of the air inlet facing the outside of the smoke exhaust duct, and the above-mentioned inner opening is the end of the air inlet facing the inside of the smoke exhaust duct.

[0090] In this embodiment, the circular cover plate 6 is a circular variable diameter cover plate 6a, and the diameter of the first variable diameter outer thread 8a on its outer side wall gradually decreases from the root to the end. The first variable diameter outer thread 8a on the outer side wall of the circular variable diameter cover plate 6a matches the variable diameter inner thread 3a of the variable diameter air inlet. The circular variable diameter cover plate 6a can be screwed onto the upper variable diameter air inlet 2a or the lower variable diameter air inlet 5a to seal the upper variable diameter air inlet 2a or the lower variable diameter air inlet 5a accordingly; the circular variable diameter cover plate 6a can also be removed by rotating in the opposite direction to open the variable diameter air inlet 2a or 5a; the above-mentioned root is one end of the circular variable diameter cover plate 6a screwed out of the variable diameter air inlet, and the above-mentioned end is one end of the circular variable diameter cover plate 6a screwed into the variable diameter air inlet.

[0091] In this embodiment, the second external thread 10 on the outer wall of the smoke channel of the check valve 9 is a second variable diameter external thread 10a, and the diameter of the second variable diameter external thread 10a gradually decreases from its root to the end, and its second variable diameter external thread 10a matches the variable diameter internal thread 3a set at the variable diameter air inlet. The check valve 9 can be screwed on the upper variable diameter air inlet 2a or the lower variable diameter air inlet 5a to connect the oil fume exhaust equipment, and the check valve 9 can also be removed by rotating in the reverse direction to open the upper variable diameter air inlet 2a or the lower variable diameter air inlet 5a. It should be pointed out here that: since its structural principle and installation and removal method are the same as those of the circular variable diameter cover plate 6a, no illustration is given here. Similarly, the above-mentioned root is one end of the check valve 9 screwed out of the variable diameter air inlet, and the above-mentioned end is one end of the check valve 9 screwed into the variable diameter air inlet.

[0092] In this embodiment, the material for making the circular cover plate 6 and the circular variable diameter cover plate 6a is the same as the material for making the main flue gas duct 1 of the smoke exhaust duct, and both can be made by slurry casting; and the slurry for making the circular cover plate 6 and the circular variable diameter cover plate 6a and the main flue gas duct 1 can be made by mixing concrete, cement, gypsum, magnesium oxychloride cement and other materials with the same or different grades and the same or different proportions.

[0093] In the present embodiment, the main flue 1 of the smoke exhaust duct is mainly installed in the kitchen and bathroom of the residential building and is integrated with the wall, which requires that its service life should be the same as that of the building itself. Therefore, the material of the main flue duct 1 of the smoke exhaust duct is generally cement mortar. In order to ensure the quality of the main flue duct 1 of the smoke exhaust duct, the circular cover plate 6 and the circular variable cover plate 6a, which are a component of the main flue duct 1 of the smoke exhaust duct, should also be made of the same material as the main flue duct 1 of the smoke exhaust duct to ensure the same quality and service life as the main flue duct 1 of the smoke exhaust duct. In this way, there is no need to change the material on site of the main flue duct 1 of the smoke exhaust duct to minimize the cost. In addition, when the main flue duct 1 is manufactured, the variable diameter air inlet 2a or 5a of the main flue duct 1 is manufactured; after the mold for the thread of the variable diameter air inlet 2a or 5a of the main flue duct 1 is placed and fixed, the slurry can be poured into it at one time to solidify and form together with the main flue duct 1.

[0094] In this embodiment, the variable diameter inner thread 3a of the variable diameter air inlet is set to a structure with a gradually decreasing diameter. Firstly, it is convenient for demolding. Similarly, the manufacturing scheme of setting the circular cover plate 6 to a circular variable diameter cover plate 6a is also for the convenience of demolding the circular cover plate 6. Secondly, when some users do not need to install the check valve 9, the smoke exhaust pipe of the oil fume exhaust equipment can be directly connected with the upper variable diameter air inlet 2a or the lower variable diameter air inlet 5a. The upper variable diameter air inlet 2a or the lower variable diameter air inlet 5a can correspond to smoke exhaust pipes of different diameters, and check valves 9 of different diameters can also be installed, so that the second variable diameter outer thread of the check valve 9 is easy to match with the upper variable diameter air inlet 2a or the lower variable diameter air inlet 5a to meet the various needs of users.

[0095] Embodiment 2

[0096] like Figures 1 to 18 As shown, in this embodiment, a plurality of small holes 17 are directly arranged on the inner wall of the cylindrical smoke passage 11 through which the check valve 9 passes smoke; or a recessed or protruding porous ring 16 is arranged close to the inner wall of the cylindrical smoke passage 11, and a plurality of small holes 17 are arranged on the inner wall of the porous ring 16, and the diameter of the small holes 17 is greater than or equal to the diameter of the shaft 13 of the flap 12. The shaft 13 of the flap 12 is divided into a left shaft 13a and a right shaft 13b, and the proximal ends of the left shaft 13a and the right shaft 13b are inserted into the sleeve 15, and a spring 20 is also installed in the sleeve 15, and the two ends of the spring 20 are respectively connected to the left shaft 13a and the right shaft 13b; the sleeve 15 can reduce the friction and wear of the left shaft 13a and the right shaft 13b at the connection part. This helps to extend the service life of the shaft 44 and reduce the failure or maintenance cost caused by wear. The left shaft 13a and the right shaft 13b each have a handle, a left handle 18 is arranged on the left shaft 13a, and a right handle 19 is arranged on the right shaft 13b, and a spring 20 is arranged between the left and right shafts 13a and 13b; when the distance between the left and right handles 18 and 19 is tightened, the ends of the left and right shafts 13a and 13b can be aligned with the corresponding small holes 17 respectively, and after the left and right handles 18 and 19 are released, the spring 20 rebounds and the ends of the left and right shafts 13a and 13b are respectively inserted into the corresponding small holes 17, so as to achieve the effect of rotatably installing the flap in the smoke channel 11.

[0097] In this way, when the main flue gas duct 1 of the exhaust duct is installed and the user needs to install the check valve 9, the cylindrical flue gas duct 11 of the check valve 9 can be first installed at the upper air inlet 2 or the lower air inlet 5 by rotating the second outer thread 10 on the inner thread 3; then the flap 12 is extended into its cylindrical flue gas duct 11, so that the shaft 13 on the flap 12 is in a horizontal position, and the center of gravity of the flap 12 is at the lower side of the shaft 13; then two fingers are used to hold the left handle 18 on the left shaft 13a and the right handle 19 on the right shaft 13b, and the ends of the left shaft 13a and the right shaft 13b are contracted, and the ends of the left shaft 13a and the ends of the right shaft 13b are respectively aligned with the small holes 17 on the corresponding porous ring 16, and then the left handle 18 and the right handle 19 are released, and the spring 20 rebounds to insert the left and right ends into the small holes 17 respectively. After installation in this way, the center of gravity of the flap 12 faces downward. When the connected exhaust fume device does not exhaust smoke, the flap 12 connected by the eccentrically arranged shaft 13 can automatically fall to a vertical position under the action of its own gravity and cover the smoke channel 11 accordingly, preventing the smoke in the shared smoke exhaust duct from flowing back into the room.

[0098] In addition, in the present embodiment, the flap 12 can also be installed on the cylindrical smoke channel 11 via an annular bearing. The above-mentioned annular bearing can be installed on any radial section of the cylindrical smoke channel 11 so as to produce circumferential rotation around the axis; and the flap 12 can be installed on the annular bearing around any horizontal axis, so that after the flap is installed on the smoke channel 11 via the annular bearing, the annular bearing can be rotated to adjust the relative position of the flap 12 so as to keep a larger part in the lower part of the channel, thereby achieving the effect of the flap 12 rotating under gravity (not indicated in the drawings).

[0099] Embodiment 3

[0100] A smoke exhaust duct structure in this embodiment, based on the above embodiment, also has the following distinguishing technical features:

[0101] like Figures 16 to 18 As shown, in this embodiment, the circular cover plate 6 is installed at the air inlet via a reducing ring 22, so that the air inlet can be adapted to circular cover plates 6 of different radial sizes, so that circular cover plates of different radial sizes can be adapted to and closed at the air inlet of the smoke exhaust duct using the reducing ring.

[0102] Specifically, the outer wall of the reducing ring 22 is provided with an installation outer thread 222, and the inner wall of the reducing ring 22 is provided with an installation inner thread 221, wherein the installation outer thread 222 matches the inner thread 3 of the inner wall of the air inlet, and the installation inner thread 221 matches the first outer thread 8 of the outer wall of the circular cover plate 6. The reducing ring 22 can be rotated to make its installation outer thread 222 meshed and connected with the inner thread 3 of the air inlet, and the circular cover plate 6 can be rotated to make its first outer thread 8 meshed and connected with the installation inner thread 221 of the reducing ring 22, and the check valve 9 can be rotated to make its second outer thread meshed and connected with the installation inner thread 221 of the reducing ring 22. Of course, the reducing ring 22 and the circular cover plate 6 can be removed by rotating in the opposite direction, or the reducing ring 22 and the check valve 9 can be removed by rotating in the opposite direction to open the air inlet.

[0103] In this embodiment, the diameter-changing ring 22 can conveniently change the diameter of the air inlet, can be connected to circular cover plates 6 or check valves 9 of different calibers, and can also be directly connected to exhaust pipes of exhaust equipment of different calibers.

[0104] Embodiment 4

[0105] This embodiment introduces a manufacturing process for the smoke exhaust duct in the above embodiment, which includes the following steps:

[0106] S1. Making a prefabricated block 40 containing an air inlet;

[0107] S2. Build a mold for the smoke exhaust duct;

[0108] S3. Fix the prefabricated block 40 in the mold of the smoke exhaust duct, pour slurry into the mold of the smoke exhaust duct, and demould after the slurry solidifies to form the main smoke duct 1 of any smoke exhaust duct in the above embodiments.

[0109] Through the above-mentioned arrangement, the air inlet of the smoke exhaust duct can be directly manufactured by advanced prefabricated blocks, the air inlet containing the inner thread is prefabricated on the prefabricated block, and then the prefabricated block containing the air inlet with the inner thread is installed in the mold for forming and manufacturing the main smoke duct 1, thereby realizing the rapid manufacturing of the main smoke duct with the air inlet containing the inner thread, and the air inlet can be reinforced and cast to improve the strength and precision of the inner thread of the air inlet.

[0110] In this embodiment, the slurry for making the prefabricated block 40 in step S1 and the slurry for making the main flue gas duct 1 of the smoke exhaust duct in step S2 are made of the same material; the above-mentioned same material is composed of the same components, and the ratios between the components can be the same or different; for example: the slurry for making the prefabricated block 40 and the slurry for making the main flue gas duct 1 of the smoke exhaust duct in step S2 are composed of cement of the same or different grades and / or the same or different ratios; specifically, it can be as follows: the cement grade used in the prefabricated block 40 is higher than the cement grade of the main flue gas duct 1 of the smoke exhaust duct, so as to improve the strength of the prefabricated block 40.

[0111] At the same time, in this embodiment, the prefabricated block 40 is a square block structure as an example for discussion. A circular air inlet is opened on the front and rear horizontal positions of the square prefabricated block 40, and steel bars 48 protruding outward are respectively provided at the upper, lower, left and right four positions of the square prefabricated block 40, which are used to connect the prefabricated block 40 and the main flue gas duct 1, thereby improving the reliability of the casting and assembly of the prefabricated block 40 on the main flue gas duct 1; at the same time, in order to facilitate the casting and molding between the prefabricated block 40 and the main flue gas duct 1, inwardly recessed grooves 49 can be respectively provided on the upper, lower, left and right four sides of the square prefabricated block 40, and the grooves 49 are formed in a circle around the outer circumference of the square prefabricated block 40, so as to facilitate the contact area between the slurry poured in the mold of the smoke exhaust duct and the square prefabricated block 40, thereby improving the installation reliability between the square prefabricated block 40 and the main flue gas duct 1.

[0112] In this embodiment, S1. The steps of making the prefabricated block 40 with the air inlet are as follows:

[0113] S11. Fix the outer frame 43 of the prefabricated block mold, the inner diameter of the outer frame 43 of the prefabricated block mold is smaller than the width of the panel 4 of the main flue gas duct 1 of the exhaust gas duct and larger than the inner diameter of the air inlet of the exhaust gas duct, and the outer frame 43 of the prefabricated block mold is any one of square, circular or irregular shapes;

[0114] S12. The cover model 41 with an outer wire is placed in the middle of the outer frame 43 and fixed, and the cover model 41 is arranged in the same shape as the circular cover 6;

[0115] S13. Then, the slurry is injected into the space between the cover plate mold 41 and the outer frame 43, and the injected slurry is vibrated to make it dense. After the slurry solidifies, the cover plate mold 41 is rotated in the reverse direction to unscrew it, thereby forming a prefabricated block 40 with an air inlet with an inner thread.

[0116] like Fig.30 As shown, in this embodiment, the prefabricated block mold includes an outer frame 43, the outer frame 43 is a square groove with an open upper side, and a circle of inwardly recessed grooves is provided on the surrounding side walls of the outer frame, the grooves are respectively inclined inward on the upper side and the lower side, and the cross-section is triangular, so that the outer periphery of the manufactured prefabricated block 40 is provided with a circle of grooves 49 of the same shape; a detachable cover plate model 41 is installed at the center of the outer frame 43, the cover plate model 41 is arranged in the same shape as the circular cover plate 6 in a one-to-one ratio, and an external thread is arranged on the outer peripheral wall, so that the center of the formed prefabricated block 40 forms an air inlet with an internal thread 3 that is matched with the cover plate model 41, which is used to form an upper air inlet 2 or a lower air inlet 5.

[0117] In this embodiment, the steps of S2. constructing a mold for the smoke exhaust duct are as follows:

[0118] S21. The outer mold 50 and the inner mold 51 of the smoke exhaust duct mold are fixedly installed inside and outside, and the upper section and the lower section on the same side of the outer mold 50 are respectively provided with outer circular holes 501, and the diameter of the outer circular hole 501 is matched with the air inlet provided on the prefabricated block 40, and the upper section and the lower section on the inner mold plate 51 are respectively provided with inner circular holes 511, and the inner circular holes 511 and the outer circular holes 501 are provided oppositely on the same horizontal line with their centers.

[0119] In this embodiment, Figures 19 to 24 As shown, the mold of the smoke exhaust duct can be arranged as follows: a circle of annular inner folded edges 50a or 51a horizontally bent toward the inner side of the smoke exhaust duct can be respectively arranged at the outer circular hole 501 of the outer mold 50 and the inner circular hole 511 of the inner mold 51, the annular inner folded edge 50a of the outer circular hole 501 of the outer mold 50 and the inner wall of the outer opening of the air inlet of the prefabricated block 40 are in limiting contact, and the annular inner folded edge 51a of the inner circular hole 511 of the inner mold 51 and the outer wall of the demolding forming part of the inner opening of the air inlet of the prefabricated block 40 are in limiting contact, so that the prefabricated block 40 can be directly positioned and installed at the corresponding positions of the inner mold 50 and the outer mold 51.

[0120] In this embodiment, S3. includes the following:

[0121] S31. Two prefabricated blocks 40 are installed and fixed between the constructed outer mold 50 and the inner mold 51, so that the air inlets of the two prefabricated blocks 40 correspond to the outer circular hole 501a set at the upper section of the outer mold 50 and the outer circular hole 501b set at the lower section, and the air inlets of the two prefabricated blocks 40 correspond to the inner circular hole 511a set at the upper section of the inner mold 51 and the inner circular hole 511b set at the lower section, so that the upper section and lower end of the same side panel 4 of the main flue gas duct 1 are respectively provided with an upper air inlet 2 and a lower air inlet 5 with an inner thread 3.

[0122] Alternatively, S3. includes the following,

[0123] S31. Only the outer mold 50 or the inner mold 51 is built, and two prefabricated blocks 40 are fixed on one side of the built outer mold 50 or the inner mold 51, so that the air inlets of the two prefabricated blocks 40 correspond to the circular holes provided in the upper section or the lower section of the outer mold 50 or the inner mold 51, and the air inlets of the two prefabricated blocks 40 correspond to the circular holes;

[0124] S32. Apply slurry to the constructed outer mold 50 or inner mold 51, so that the applied slurry and the prefabricated block 40 together constitute the main flue gas duct 1, so that the upper section and the lower end of the same side panel 4 of the main flue gas duct 1 are respectively provided with an upper air inlet 2 and a lower air inlet 5 with an inner thread 3.

[0125] Embodiment 5

[0126] This embodiment introduces a manufacturing process for the smoke exhaust duct in the above embodiment, which includes the following steps:

[0127] The outer mold 50 and the inner mold 51 of the exhaust duct mold are fixedly installed inside and outside, the upper section and the lower section of the same side of the outer mold 50 are respectively provided with outer circular holes 501, and the upper section and the lower section of the same side of the inner mold 51 are respectively provided with inner circular holes 511, and the inner circular holes 511 and the outer circular holes 501 are provided with their centers on the same horizontal line.

[0128] A detachable cover plate mold 41 is installed between the outer circular hole 501 of the outer mold 50 and the inner circular hole 511 of the inner mold 51, and the outer peripheral wall of the cover plate mold 41 has an inner thread;

[0129] The slurry is poured between the outer mold 50 and the inner mold 51 , and after solidification, the slurry is demoulded to form the main smoke duct 1 of the smoke exhaust duct structure. The two cover plate molds 41 are disassembled to form the upper air inlet 2 and the lower air inlet 5 of the main smoke duct 1 .

[0130] In this embodiment, Figure 25 to Figure 28 As shown, the mold of the smoke exhaust duct can be set as follows:

[0131] The outer circular hole 501 of the outer mold 50 and / or the inner circular hole 511 of the inner mold 51 are respectively provided with inner threads for engaging with the outer thread threads of the cover plate model 41, so that the cover plate model 41 can be detachably installed on the mold of the smoke exhaust duct; for example, as follows: Fig.25 and Fig. 27 As shown, the outer circular hole 501 of the outer mold 50 is provided with an inner thread, and the inner circular hole 511 of the inner mold 51 is smooth and has no inner thread, so that the end of the cover plate model 41 is in supporting contact with the inner circular hole 511 and the root is threadedly engaged with the outer circular hole 501 for detachable installation.

[0132] Of course, in order to improve the installation strength of the cover plate model 41, an annular folding edge that is relatively horizontally bent outward can be set at the outer circular hole 501 of the outer mold 50 and / or the inner circular hole 511 of the inner mold 51, and an inner thread can be added to the inner peripheral wall of the annular folding edge to improve the installation support strength of the cover plate model 41; for example, as follows: Fig.26 and Fig.28As shown, the outer circular hole 501 of the outer mold 50 and the inner circular hole 511 of the inner mold 51 are respectively provided with a circle of annular folded edges horizontally bent in opposite directions, and the inner peripheral side walls of the annular folded edges are respectively provided with internal threads; that is, the outer circular hole 501 of the outer mold 50 is provided with a circle of outer folded edges 50b, and the inner circular hole 511 of the inner mold 51 is provided with a circle of inner folded edges 51a; the outer folded edges 50b of the outer mold 50 and the inner folded edges 51a of the inner mold 51 are respectively provided with internal threads on the inner peripheral side walls, so as to engage with the outer threads at the root and end of the cover model 41 through threaded engagement, so that the cover model 41 can be assembled with the inner and outer molds through threaded engagement respectively.

[0133] Embodiment 6

[0134] This embodiment introduces a manufacturing process for the smoke exhaust duct in the above embodiment, which includes the following steps:

[0135] The outer mold 50 and the inner mold 51 of the exhaust duct mold are fixedly installed inside and outside, the upper section and the lower section of the same side of the outer mold 50 are respectively provided with outer circular holes 501, and the upper section and the lower section of the same side of the inner mold 51 are respectively provided with inner circular holes 511, and the inner circular holes 511 and the outer circular holes 501 are provided with their centers on the same horizontal line.

[0136] An annular installation tube 42 is installed and fixed between the outer circular hole 501 of the outer mold 50 and the inner circular hole 511 of the inner mold 51. The inner peripheral wall of the annular installation tube 42 has an inner thread.

[0137] The slurry is poured between the outer mold 50 and the inner mold 51 , and after solidification, the slurry is demoulded to form the main smoke duct 1 of the smoke exhaust duct structure. The upper air inlet 2 and the lower air inlet 5 of the main smoke duct 1 are formed after the two cover plate molds 41 are disassembled.

[0138] In this embodiment, Fig.29 As shown, the mold of the smoke exhaust duct can be set as follows:

[0139] The outer circular hole 501 of the outer mold 50 and the inner circular hole 511 of the inner mold 51 are respectively provided with relatively horizontally bent annular folded edges; that is, the outer circular hole 501 of the outer mold 50 is provided with a circle of inner folded edges 50a, and the inner circular hole 511 of the inner mold 51 is provided with a circle of outer folded edges 51b; the annular mounting tube 42 extends horizontally, and its two ends are respectively sleeved on the outer peripheral side walls of the inner folded edges 50a and the outer folded edges 51b, and the inner wall of the annular mounting tube 42 is provided with an inner thread, so that the annular mounting tube 42 can be directly embedded in the cast main flue duct 1, so that the upper air inlet 2 or the lower air inlet 5 formed inside the annular mounting tube 42 has an inner thread 3 respectively.

[0140] Embodiment 7

[0141] This embodiment introduces a manufacturing process for the smoke exhaust duct in the above embodiment, which includes the following steps:

[0142] The main flue gas duct 1 of the flue gas duct is assembled by splicing multiple plates;

[0143] One of the plates constitutes a panel 4, and two upper and lower air inlets 3 are provided on the panel 4;

[0144] The inner holes of the upper and lower air inlets 3 are provided with inner threads 3 by tapping.

[0145] A circular cover plate 6 is made of a plate made of the same material, and a first external thread 8 is provided on the outer periphery of the circular cover plate 6 by external tapping;

[0146] The circular cover plate 6 is covered on the air inlet 3 by means of internal and external thread engagement.

[0147] By adopting the above method, the plate can form the main smoke duct 1 and the cover plate 3 of the smoke exhaust duct, and the inner and outer tapping method of the plate can be used to realize the scheme of setting the inner thread 3 and the first outer thread 8, thereby realizing the technical scheme of forming the smoke exhaust duct by using the plate structure.

[0148] The above is only a preferred embodiment of the present application and does not constitute any form of limitation to the present application. Although the present application has been disclosed as above with a preferred embodiment, it is not used to limit the present application. Any technician familiar with this patent can make some changes or modifications to equivalent embodiments of equivalent changes using the technical content suggested above without departing from the scope of the technical solution of the present application. The implementation scheme in the above embodiment can also be further combined or replaced. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the present application without departing from the content of the technical solution of the present application are still within the scope of the solution of the present application.

Claims

1. A smoke exhaust duct structure, comprising a main smoke duct (1), wherein at least two air inlets are provided on a side panel (4) of the main smoke duct (1), wherein at least one air inlet is located at a position above 1 / 2 of the height of the main smoke duct (1), and at least one air inlet is located at a position below 1 / 2 of the height of the main smoke duct (1), and at least one air inlet is replaceably provided with a circular cover plate (6) or a check valve (9), wherein the air inlet is a circular hole, and the check valve (9) is provided with a smoke passage (11) for passing smoke, and a reversible flap (12) is installed in the smoke passage (11), wherein the flap (12) allows smoke to pass when opened and prevents smoke in the main smoke duct (1) from flowing back when closed; the smoke passage (11) of the check valve (9) is cylindrical; Features: An inner thread (3) is arranged on the inner side wall of the circular hole of the air inlet; A first outer thread (8) having a diameter matching that of the inner thread (3) on the inner wall of the air inlet is provided on the outer wall of the circular cover plate (6); A second outer thread (10) matching the inner thread (3) on the inner wall of the air inlet is arranged on the outer side wall of the cylindrical smoke passage (11) of the non-return valve (9).

2. A smoke exhaust duct structure according to claim 1, characterized in that: The circular air inlet is a circular variable diameter air inlet, and the inner thread (3) on the inner side wall thereof is a variable diameter inner thread (3a) whose diameter gradually decreases from the outer opening to the inner opening; The circular cover plate (6) is a circular variable diameter cover plate (6a), and the first external thread (8) on the outer wall thereof is a first variable diameter external thread (8a) whose diameter gradually decreases from the root to the end, and the first variable diameter external thread (8a) on the outer wall of the circular variable diameter cover plate (6a) matches the variable diameter internal thread (3a) of the circular variable diameter air inlet, and is used to engage the detachable thread of the circular variable diameter cover plate (6a) with the variable diameter air inlet; The second outer thread (10) on the outer side wall of the smoke passage (11) of the check valve (9) is a second reducing outer thread whose diameter gradually decreases from its root to its end. The second reducing outer thread matches the reducing inner thread (3a) of the reducing air inlet and is used to engage the detachable thread of the check valve (9) with the reducing air inlet.

3. A smoke exhaust duct structure according to claim 1 or 2, characterized in that: The material of the circular cover plate (6) and the circular variable diameter cover plate (6a) is the same as, or partially the same as, the material of the main smoke duct (1) of the smoke exhaust duct; Preferably, the circular cover plate (6) and the main flue gas duct (1) are both formed by slurry casting; Preferably, the circular cover plate (6) and the main flue gas duct (1) are formed by casting slurries of different proportions and / or different grades.

4. A smoke exhaust duct structure according to claim 1 or 2, characterized in that: The flap (12) is provided with a shaft (13); at least one mounting hole (17) is provided on the inner wall of the cylindrical shell; the diameter of the mounting hole (17) is greater than or equal to the diameter of the shaft (13); the shaft (13) is inserted into the mounting hole (17) to enable the flap (12) to be flipably mounted in the smoke passage (11) to open and close the smoke passage (11); The shaft (13) is eccentrically arranged on the upper part of the flap (12), and the flap (12) is flipped downward to a vertically closed smoke passage (11) position under the action of gravity of its own center eccentric to the shaft (13), so as to drive the flap (12) to maintain a closed state of closing the main smoke passage (1) under normal conditions; Preferably, a radially protruding or radially outwardly concave porous ring (16) is provided on the inner wall of the cylindrical shell, and at least one small hole (17) is provided on the porous ring (16) for rotatably plugging and installing the shaft (13); Preferably, the flap (12) is mounted on the smoke channel (11) via a circular bearing.

5. A smoke exhaust duct structure according to claim 4, characterized in that: The shaft rod (13) comprises a left shaft rod (13a) and a right shaft rod (13b); the left shaft rod (13a) and the right shaft rod (13b) are connected via a sleeve (15); the sleeve (15) is arranged on the flap (12), a spring (20) is arranged in the sleeve (15), and the spacing between the left shaft rod (13a) and the right shaft rod (13b) is adjusted via the spring (20); The left and right shafts (13a) and (13b) are provided with left and right handles respectively; the left and right handles are used to compress the spring (20) so that the ends of the left and right shafts (13a) and (13b) can be retracted and plugged into the corresponding small holes (17); Preferably, the shaft (13) of the flap (12) is divided into a left shaft (13a) and a right shaft (13b), and a spring (20) is arranged between the left and right shafts (13a), (13b) for moving the left and right shafts (13a), (13b) relatively closer or farther away, and the ends of the left and right shafts (13a), (13b) can be telescopically inserted into the corresponding small holes (17).

6. A smoke exhaust duct structure according to claim 1 or 2, characterized in that: The circular cover plate (6) is installed on the air inlet via a diameter-changing ring (22); The outer wall of the reducing ring (22) is provided with an installation outer thread (222), and the inner wall is provided with an installation inner thread (221), the installation outer thread (222) matches the inner thread (3) of the inner wall of the air inlet, and the installation inner thread (221) matches the first outer thread (8) of the outer wall of the circular cover plate (6), or the second outer thread (10) of the outer wall of the check valve (9), so as to detachably connect the reducing ring (22) to be meshed with the inner thread (3) of the air inlet via the installation outer thread (222), detachably connect the first outer thread (8) of the circular cover plate (6) to be meshed with the installation inner thread (221) of the reducing ring (22), and detachably connect the second outer thread (10) of the check valve (9) to be meshed with the installation inner thread (221) of the ring; Preferably, a handle is provided on the side of the circular cover plate (6) facing the smoke exhaust airway portion, and the handle is an inner concave handle (221) or an outer convex handle (221).

7. A process for manufacturing a smoke exhaust duct, characterized in that: S1. Making a prefabricated block (40) containing an air inlet; S2. Build a mold for the smoke exhaust duct; S3. Fix the prefabricated block (40) in the mold of the smoke exhaust duct, pour or apply slurry into the mold of the smoke exhaust duct, and demould after the slurry solidifies to form the main smoke duct (1) of the smoke exhaust duct according to any one of claims 1 to 6; Preferably, the slurry for making the prefabricated block (40) in step S1 and the slurry for making the main flue gas duct (1) in step S2 are made of the same material; the same material is composed of the same components, and the ratios between the components are the same or different.

8. The manufacturing process of the smoke exhaust duct according to claim 7, characterized in that: The step of S1. manufacturing the prefabricated block (40) containing the air inlet is specifically as follows: S11. Fixing the outer frame (43) of the mold of the prefabricated block (40), wherein the inner diameter of the outer frame (43) of the mold of the prefabricated block (40) is smaller than the width of the smoke exhaust duct panel (4) and larger than the inner diameter of the smoke exhaust duct air inlet, and the outer frame (43) of the mold of the prefabricated block (40) is any one of square, circular or irregular shapes; S12. The cover plate model (41) with the outer thread is placed in the middle position of the outer frame (43) and fixed, and the cover plate model (41) is arranged in the same shape as the cover plate; S13. Then, the slurry is injected into the space between the cover plate mold (41) and the outer frame (43), and the injected slurry is vibrated to make it dense. After the slurry solidifies, the cover plate mold (41) is rotated in the opposite direction to unscrew it, so as to form a prefabricated block (40) with an air inlet having an inner thread (3); Preferably, said S2. includes the following, S21. The outer mold (50) and the inner mold (51) of the mold of the exhaust duct are fixedly installed inside and outside, and the upper section and the lower section of the same side of the outer mold (50) are respectively provided with outer circular holes (501), and the diameter of the outer circular holes (501) is matched with the air inlet provided on the prefabricated block (40), and the upper section and the lower section of the inner mold are respectively provided with inner circular holes, and the inner circular holes and the outer circular holes (501) are provided oppositely on the same horizontal line with their centers being on the same horizontal line; Preferably, said S3. includes the following, S31. Two prefabricated blocks (40) are installed and fixed between the constructed outer mold (50) and the inner mold (51), so that the air inlets of the two prefabricated blocks (40) correspond to the outer circular holes (501) set at the upper and lower sections of the outer mold (50), and the air inlets of the two prefabricated blocks (40) correspond to the inner circular holes (511) set at the upper and lower sections of the inner mold (51).

9. A process for manufacturing a smoke exhaust duct, characterized in that: The outer mold (50) and the inner mold (51) of the smoke exhaust duct mold are fixedly installed inside and outside, the upper section and the lower section on the same side of the outer mold (50) are respectively provided with outer circular holes (501), and the upper section and the lower section on the same side of the inner mold (51) are respectively provided with inner circular holes, and the inner circular holes and the outer circular holes (501) are oppositely opened with their centers on the same horizontal line; A detachable cover plate model (41) is installed between the outer circular hole (501) of the outer mold (50) and the inner circular hole of the inner mold (51), and the outer peripheral wall of the cover plate model (41) has an inner thread (3); The slurry is poured between the outer mold (50) and the inner mold (51). After the slurry solidifies, it is demoulded to form the main smoke duct (1) of the smoke exhaust duct as described in any one of claims 1 to 6. After the cover plate model (41) is disassembled, the air inlet of the smoke exhaust duct is formed.

10. A process for manufacturing a smoke exhaust duct, characterized in that: The outer mold (50) and the inner mold (51) of the smoke exhaust duct mold are fixedly installed inside and outside, the upper section and the lower section on the same side of the outer mold (50) are respectively provided with outer circular holes (501), and the upper section and the lower section on the same side of the inner mold (51) are respectively provided with inner circular holes, and the inner circular holes and the outer circular holes (501) are oppositely opened with their centers on the same horizontal line; An annular mounting flange is fixedly installed between the outer circular hole (501) of the outer mold (50) and the inner circular hole of the inner mold (51), and the inner peripheral wall of the annular mounting flange has an inner thread (3); A slurry is poured between the outer mold (50) and the inner mold (51). After the slurry solidifies, it is demoulded to form the main smoke duct (1) of the smoke exhaust duct as described in any one of claims 1 to 6. The annular mounting flange is embedded and fixed on the smoke exhaust duct, and the interior of the annular mounting flange forms the air inlet of the smoke exhaust duct.

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