Backdraft prevention components and dehumidification devices for the dehumidification duct of the dryer

Abstract

This utility model belongs to the field of drying technology, and discloses a backflow prevention component and dehumidification device for the dehumidification duct of a dryer, including a connecting pipe; multiple dehumidification ducts of dryers are connected to a common connecting pipe, and all dehumidification ducts are connected to the connecting pipe; multiple dryers corresponding to the same connecting pipe are used to dehumidify a drying chamber; a control unit is fixed inside each dehumidification duct; when the dehumidification operation of the dryer is started, the dryer discharges humid airflow to the dehumidification duct, the humid airflow impacts the control unit and opens the control unit, so that the dehumidification duct and the connecting pipe form a through pipe; when the dehumidification operation of the dryer is stopped, the control unit automatically seals the dehumidification duct under the action of gravity; effectively solving the problem in the prior art that when the drying demand is reduced and only some dryers are working, moisture easily flows back into the drying chamber through the idle dryers.

Description

Technical Field

[0001] This utility model belongs to the field of drying technology, specifically relating to a backdraft prevention component and dehumidification device for a dryer's dehumidification duct. Background Technology

[0002] In industrial production, drying equipment typically requires phased adjustments to its operating mode based on the characteristics of the materials. Taking food drying as an example, initially, multiple dryers need to operate at full load for rapid dehumidification, while later, the number of operating units can be reduced to maintain suitable humidity. In scenarios where multiple dryers operate collaboratively in the same drying chamber, to improve the overall structural compactness and facilitate the targeted collection and treatment of exhaust moisture, the exhaust pipes of multiple dryers are usually connected to a single main pipe. However, this operating method has a prominent problem: when some dryers stop working, their connected exhaust pipes are open, causing the moisture discharged from the working units to flow back into the idle units. This not only affects humidity control within the drying chamber but also causes heat loss. Therefore, in existing technologies, when drying demand decreases and only some dryers are operating, moisture easily flows back into the drying chamber through the idle dryers. Utility Model Content

[0003] To address the shortcomings of existing technologies, the purpose of this utility model is to provide a backflow prevention component and dehumidification device for the dehumidification duct of a dryer, which solves the problem in existing technologies where, when drying demand is reduced and only part of the dryer is working, moisture easily flows back into the drying chamber through the idle dryer.

[0004] The objective of this utility model can be achieved through the following technical solutions:

[0005] Backdraft prevention components for the dryer's exhaust duct, including connecting pipes;

[0006] The exhaust ducts of multiple dryers are connected to a common connecting pipe, and all exhaust ducts are connected to the connecting pipe in a continuous manner.

[0007] Multiple dryers corresponding to the same connecting pipe are used together to dehumidify a drying chamber;

[0008] Each exhaust duct is equipped with a control unit.

[0009] When the dryer starts dehumidification operation, the dryer discharges the humid airflow into the dehumidification duct. The humid airflow impacts the control unit and opens the control unit, so that the dehumidification duct and the connecting pipe form a through pipeline.

[0010] When the dryer stops dehumidifying, the control unit automatically seals the dehumidifying duct under gravity.

[0011] There is at least one vertically upward-placed first pipe section in the exhaust duct, and the control unit is located at the first pipe section;

[0012] The control unit includes a sleeve fixed inside the first pipe section. The sleeve is placed vertically and has an open upper and lower end. The outer peripheral wall of the sleeve is attached to the inner wall of the first pipe section to form an airtight seal. Multiple rotating shafts are rotatably connected inside the sleeve and are placed in parallel. The rotating shafts are all placed horizontally and each rotating shaft has a valve plate fixed on it. The valve plate extends away from the end of the rotating shaft and rotates inside the sleeve around the central axis of the corresponding rotating shaft.

[0013] An annular retaining ring is fixed to the inner circumferential wall of the sleeve. The rotating shaft is located at the upper end of the retaining ring. When the valve plate is away from the rotating shaft end and contacts the upper end face of the retaining ring, the valve plates work together to seal the inner side of the sleeve.

[0014] One end of the connecting pipe is sealed, and the other end is open.

[0015] The backdraft prevention component for the exhaust duct also includes a main air duct that is horizontally arranged on one side of the drying chamber, with both ends of the main air duct being open.

[0016] The opening end of the connecting tube is connected to the periphery of the main air tube, and the connecting tube is connected to the inside of the main air tube.

[0017] When there are multiple drying chambers, the two main air pipes corresponding to two adjacent drying chambers are connected in a continuous manner.

[0018] The connecting tube is detachably connected to the main air tube;

[0019] The two adjacent main air tubes are detachably connected.

[0020] One end of the main air tube is equipped with a connector, and the other end of the main air tube is equipped with a socket that is compatible with the connector.

[0021] A dehumidification device includes a dryer and a backdraft prevention component for the dehumidification duct.

[0022] The beneficial effects of this utility model are:

[0023] In scenarios where multiple dryers operate collaboratively within the same drying chamber, the gravity-controlled unit utilizes its mechanical self-sealing characteristics to automatically seal the exhaust ducts of idle dryers when drying demand decreases and only some dryers are operational. This effectively prevents humid airflow from the connecting pipes from flowing back towards the idle dryers, avoiding the risk of condensation and cross-contamination inside the equipment caused by moisture backflow, or moisture flowing back into the drying chamber. Simultaneously, this sealing structure blocks the leakage of hot air from the drying chamber through idle ducts, maintaining a stable temperature and humidity environment within the system and significantly reducing unnecessary heat loss.

[0024] In conjunction with the installation of connecting pipes and main air pipes, the moisture discharged from multiple dryers corresponding to different drying chambers can be centrally collected and processed. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the connecting pipe and the dryer structure of this utility model;

[0027] Figure 2 This is a partial structural diagram of the main air tube of this utility model;

[0028] Figure 3 This is a schematic diagram of the control unit and connecting pipe of this utility model.

[0029] Figure 4 This is a schematic diagram of the retaining ring portion of this utility model. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0031] like Figures 1 to 4 As shown, a backdraft prevention assembly for a dryer's exhaust duct 300 includes a connecting pipe 100.

[0032] Multiple dryers 200 have their exhaust ducts 300 connected to a common connecting pipe 100, and all exhaust ducts 300 are connected to the connecting pipe 100.

[0033] Multiple dryers 200 corresponding to the same connecting pipe 100 are used together to dehumidify a drying chamber 600;

[0034] Each exhaust duct 300 is equipped with a control unit 400;

[0035] When the dryer 200 starts dehumidification operation, the dryer 200 discharges the humid airflow to the dehumidification duct 300. The humid airflow impacts the control unit 400 and opens the control unit 400, so that the dehumidification duct 300 and the connecting pipe 100 form a through pipe.

[0036] When the dryer 200 stops dehumidification, the control unit 400 automatically seals the dehumidification duct 300 under the action of gravity.

[0037] It should be noted that the dryer 200 is used to control the temperature and humidity of the gas in the drying chamber 600. The dryer 200 is also equipped with a return air inlet for air intake and an air supply inlet for air delivery. Both the return air inlet and the air supply inlet are connected through the interior of the drying chamber 600.

[0038] Preferably, the dryer 200 can be the integrated heat pump dryer 200 described in Chinese Patent Application No. CN202230027668.0, or the dryer 200 body described in Chinese Patent Application No. CN201620454527.6 "A Closed Internal Circulation Tobacco Drying Device", which has a heating mode, a dehumidification mode and a heating and dehumidification mode; since the dryer 200 of this application belongs to the prior art, its specific structure will not be described in detail in this application;

[0039] Multiple dryers 200 corresponding to any one connecting pipe 100 are used to control the temperature and humidity of the gas in the same drying chamber 600;

[0040] The food materials to be dried are placed in the drying chamber 600. During the initial high humidity stage of drying, the dehumidification mode of each dryer 200 needs to operate at full load. When the humidity control requirement in the drying chamber 600 decreases, such as during the significant humidity drop stage in the later stage of drying, the system can only start some dryers 200 to maintain operation. At this time, the exhaust duct 300 corresponding to the dryer 200 that is not working is in a non-exhaust state. Under this condition, the control unit 400 of the anti-backflow component is kept tightly closed by gravity, forming a reliable sealing barrier, effectively preventing the humid airflow in the connecting pipe 100 from flowing back towards the idle dryer 200, avoiding the risk of condensation and cross-contamination inside the equipment caused by moisture backflow, or moisture flowing back into the drying chamber 600. At the same time, this sealing structure blocks the leakage channel of hot air in the drying chamber 600 through the idle duct, which not only maintains a stable temperature and humidity environment inside the system, but also significantly reduces unnecessary heat loss.

[0041] At least one vertically upward-placed first pipe section 301 exists in the exhaust duct 300, and the control unit 400 is arranged at the first pipe section 301.

[0042] like Figure 3 and Figure 4 As shown, the control unit 400 includes a sleeve 401 fixed inside the first pipe section 301. The sleeve 401 is placed vertically, and both the upper and lower ends of the sleeve 401 are open. The outer peripheral wall of the sleeve 401 is attached to the inner wall of the first pipe section 301 to form an airtight seal. Multiple rotating shafts 402 are rotatably connected inside the sleeve 401 and are placed in parallel. All rotating shafts 402 are placed horizontally, and valve plates 403 are fixed on each rotating shaft 402. The valve plates 403 extend away from the end of the rotating shaft 402 and rotate around the central axis of the corresponding rotating shaft 402 inside the sleeve 401.

[0043] Preferably, a sealing ring or sealant is provided between the outer peripheral wall of the sleeve 401 and the inner wall of the first pipe section 301 to ensure the sealing between the two.

[0044] When the dryer 200 is performing dehumidification, the discharged humid airflow impacts the valve plate 403, causing the valve plate 403 to rotate upward around the central axis of the rotating shaft 402. The valve plates 403 move away from each other, and gaps are formed between the valve plates 403 for the humid airflow to pass through. When the dehumidification operation stops, the valve plate 403 returns to its original position under the action of gravity, completing the sealing of the sleeve 401.

[0045] like Figure 4 As shown, an annular retaining ring 404 is fixed on the inner peripheral wall of the sleeve 401. The rotating shaft 402 is located at the upper end of the retaining ring 404. When the end of the valve plate 403 away from the rotating shaft 402 contacts the upper end face of the retaining ring 404, each valve plate 403 together completes the sealing and plugging of the inner side of the sleeve 401.

[0046] When the dehumidification operation stops, the end of the valve plate 403 away from the rotating shaft 402 flips down to contact the upper end of the retaining ring 404, forming an effective seal on the sleeve 401; by setting the retaining ring 404, the maximum downward angle of the valve plate 403 is limited, effectively preventing the valve plate 403 from failing to seal due to excessive downward flipping.

[0047] Compared with traditional electric air valves, the control unit 400 in this application has the following advantages: First, it does not rely on sensors and PLC control systems, but can respond autonomously by airflow changes and gravity, avoiding the risk of electrical failures; Second, under high temperature and high humidity drying conditions, the durability of the mechanical structure is much higher than that of electric actuators, effectively extending the maintenance cycle; Third, its adaptive working mode, which is driven entirely by the kinetic energy of the humid airflow, enables the effective utilization of the humid airflow without the need for additional electrical energy or other power.

[0048] One end of the connecting pipe 100 is sealed, and the other end is open. The single-end open connecting pipe 100 facilitates the directional discharge of the humid airflow, making it convenient for centralized treatment or recycling.

[0049] The dehumidification duct anti-backdraft component also includes a main air duct 500 horizontally arranged on one side of the drying chamber 600, with both ends of the main air duct 500 being open.

[0050] The open end of the connecting pipe 100 is connected to the periphery of the main air pipe 500, and the connecting pipe 100 is internally connected to the main air pipe 500.

[0051] When there are multiple drying chambers 600, the two main air pipes 500 corresponding to two adjacent drying chambers 600 are connected through each other;

[0052] The main air pipes 500 of multiple drying chambers 600 are interconnected to form a main channel for centralized dehumidification, while the connecting pipes 100 corresponding to each drying chamber 600 serve as branch pipes. This structure is particularly suitable for large-scale drying production lines that require centralized dehumidification.

[0053] The connecting pipe 100 is detachably connected to the main air pipe 500;

[0054] The two adjacent main air pipes are detachably connected;

[0055] Preferably, the open end of the connecting pipe 100 is detachably connected to the main air pipe 500 via a first flange assembly; the ends of adjacent main air pipes 500 are detachably connected via a second flange assembly.

[0056] Preferably, both the first flange assembly and the second flange assembly include sealing gaskets and anti-loosening fasteners, which include, but are not limited to, bolts;

[0057] When any section of the main airway fails, the detachable connection design facilitates the disassembly and repair of the corresponding main air pipe 500.

[0058] like Figure 2 As shown, one end of the main air pipe 500 is provided with a connector 501, and the other end of the main air pipe 500 is provided with a socket 502 that is compatible with the connector 501.

[0059] Preferably, the connector 501 and the socket 502 are interference-fitted;

[0060] The plug-in connection between two adjacent main air pipes 500 enables rapid positioning and sealing. After the connector 501 is inserted into the socket 502, it automatically aligns, facilitating further installation and fixation of the two adjacent main air pipes 500.

[0061] A dehumidification device includes a dryer 200 and a dehumidification duct anti-backdraft component; the dehumidification device of this application is suitable for multiple dryers 200 working together in the same drying chamber 600, which facilitates the directional discharge of moisture. This dehumidification device is particularly suitable for large-scale drying production lines that require centralized dehumidification.

[0062] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0063] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims of this utility model.

Claims

1. A back draft prevention assembly of a moisture exhaust duct of a dryer, comprising a connecting pipe (100), characterized in that, The exhaust ducts (300) of multiple dryers (200) are connected to a common connecting pipe (100), and all exhaust ducts (300) are connected to the connecting pipe (100). Multiple dryers (200) corresponding to the same connecting pipe (100) are used together to dehumidify a drying chamber (600); Each exhaust duct (300) is equipped with a control unit (400); When the dryer (200) starts dehumidification operation, the dryer (200) discharges the humid airflow to the dehumidification duct (300), the humid airflow impacts the control unit (400) and opens the control unit (400), so that the dehumidification duct (300) and the connecting pipe (100) form a through pipeline; When the dryer (200) stops dehumidifying, the control unit (400) automatically seals the dehumidifying duct (300) under the action of gravity.

2. The reverse wind preventing assembly of claim 1, wherein, At least one vertically upward-placed first pipe section (301) exists in the exhaust duct (300), and the control unit (400) is arranged at the first pipe section (301).

3. The reverse wind preventing assembly of claim 2, wherein, The control unit (400) includes a sleeve (401) fixed inside the first pipe section (301). The sleeve (401) is placed vertically, and both the upper and lower ends of the sleeve (401) are open. The outer peripheral wall of the sleeve (401) is attached to the inner wall of the first pipe section (301) to form an airtight seal. Multiple rotating shafts (402) are rotatably connected inside the sleeve (401). The rotating shafts (402) are all placed horizontally, and valve plates (403) are fixed on each rotating shaft (402). The valve plates (403) extend away from the rotating shaft (402), and the valve plates (403) rotate inside the sleeve (401) around the central axis of the corresponding rotating shaft (402).

4. The reverse wind preventing assembly of claim 3, wherein, A ring-shaped retaining ring (404) is fixed on the inner circumferential wall of the sleeve (401). The rotating shaft (402) is located at the upper end of the retaining ring (404). When the end of the valve plate (403) away from the rotating shaft (402) contacts the upper end face of the retaining ring (404), each valve plate (403) together completes the sealing and plugging of the inner side of the sleeve (401).

5. The reverse wind preventing assembly of claim 4, wherein, One end of the connecting pipe (100) is sealed, and the other end is open.

6. The reverse wind preventing assembly of claim 5, wherein, It also includes a main air pipe (500) horizontally arranged on one side of the drying chamber (600), with both ends of the main air pipe (500) being open; The open end of the connecting pipe (100) is connected to the periphery of the main air pipe (500), and the connecting pipe (100) is internally connected to the main air pipe (500); When there are multiple drying chambers (600), the two main air pipes (500) corresponding to two adjacent drying chambers (600) are connected through each other.

7. The reverse wind preventing assembly of claim 6, wherein, The connecting pipe (100) is detachably connected to the main air pipe (500); The two adjacent main air pipes (500) are detachably connected.

8. The reverse wind preventing assembly of claim 7, wherein, One end of the main air pipe (500) is provided with a connector (501), and the other end of the main air pipe (500) is provided with a socket (502) that is compatible with the connector (501).

9. A moisture discharge device characterized by comprising: Includes a dryer (200) and a backdraft prevention assembly for the exhaust duct as described in any one of claims 1 to 8.

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