A double passage pressure relief valve device for a cigarette factory boiler

Abstract

The application discloses a double-channel pressure relief valve device for a cigarette factory boiler, which comprises a Y-shaped double-cavity main valve body, independent sub-valve bodies, a double-filtering mechanism, a tool-free dismounting mechanism and multiple composite sealing rings, the two independent sub-valve bodies are fixed with the Y-shaped double-cavity main valve body through bolt fastening assemblies, a first flange plate is fixed to the lower end of the Y-shaped double-cavity main valve body, a second flange plate is fixed to the side surface of the independent sub-valve body, multiple composite sealing rings are fixed to the end faces of the first flange plate and the second flange plate respectively, the double-filtering mechanism is inserted into each independent sub-valve body, and the tool-free dismounting mechanism for fixing the double-filtering mechanism is arranged on each independent sub-valve body. The double-filtering mechanism is arranged, impurities can be intercepted, and flow channel blockage can be avoided; the tool-free dismounting structure facilitates the dismounting and cleaning of the filter screen; and the whole device is safe and reliable and convenient to operate and maintain.

Description

Technical Field

[0001] This invention relates to the field of cigarette machinery and equipment technology, and more specifically, to a dual-channel pressure relief valve device for a cigarette factory boiler. Background Technology

[0002] In the cigarette production process, industrial boilers, as core thermal equipment, provide the steam heat source required for processes such as tobacco processing and packaging. The safe and stable operation of the boiler's pressure system is directly related to the continuous production of cigarette factories and the safety of special equipment in the factory area. Dual-channel pressure relief valves achieve redundant protection through two sets of independent valve circuits, offering advantages such as large pressure relief flow and a high safety factor. They are key safety components for automatic pressure relief protection of cigarette factory boilers in case of abnormal pressure exceeding limits. When the boiler system experiences abnormal pressure exceeding limits, the medium can be quickly released, avoiding catastrophic accidents such as boiler overpressure pipe rupture and ensuring the safe operation of the entire thermal system.

[0003] Currently, the traditional dual-channel pressure relief valves used in cigarette factories have a relatively conventional design, lacking a dedicated filter protection structure inside the valve body. Under long-term high-temperature operation, the circulating medium in cigarette factory boilers is prone to internal corrosion of the pipes and boiler body, continuously introducing solid impurities such as rust, scale, and welding slag. Even with water treatment processes for boiler feedwater, some solid impurities still enter the pressure relief pipeline with the medium. When these impurities flow through the pressure relief valve, they easily accumulate in the valve cavity, pressure relief channel, and sealing surfaces. Under minor conditions, this can reduce the medium flow cross-section, causing a decrease in pressure relief flow rate and response efficiency; in severe cases, it can directly cause blockage of the flow channel, preventing the pressure relief valve from opening properly to perform overpressure relief, rendering redundant protection functions ineffective, and posing a significant safety risk to the special equipment of cigarette factory boilers.

[0004] Therefore, how to provide a dual-channel pressure relief valve device for cigarette factory boilers has become a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0005] The purpose of this invention is to provide a new technical solution for a dual-channel pressure relief valve device for cigarette factory boilers.

[0006] According to a first aspect of the present invention, a dual-channel pressure relief valve device for a cigarette factory boiler is provided, comprising a Y-type dual-chamber main valve body, an independent sub-valve body, a dual filtration mechanism, a tool-free disassembly and assembly mechanism, and multiple composite sealing rings;

[0007] The number of independent sub-valve bodies is two. The two independent sub-valve bodies are respectively fixed to the Y-type dual-chamber main valve body by bolt fastening assembly. The lower end of the Y-type dual-chamber main valve body is fixed with a first flange, and the side of the independent sub-valve body is fixed with a second flange. Multiple composite sealing rings are fixed at the end faces of the first flange and the second flange respectively. A dual filter mechanism inserted into it can be detachably installed on each independent sub-valve body. A tool-free disassembly and assembly mechanism for fixing the dual filter mechanism is installed on each independent sub-valve body.

[0008] The dual filtration mechanism includes a plug-in semi-ring, a rubber sealing sleeve, a filter screen, and an outer frame. There are two plug-in semi-rings, two rubber sealing sleeves, and two filter screens. Each plug-in semi-ring is fixed with one filter screen. The two filter screens are respectively inserted into the two ends of the independent sub-valve body. A rubber sealing sleeve is fixed to the outside of each plug-in semi-ring. The Y-shaped dual-chamber main valve body is provided with a locking groove for locking the plug-in semi-ring and the rubber sealing sleeve. The two plug-in semi-rings are fixedly connected by the outer frame.

[0009] Optionally, a pull-out handle is fixed to the outer frame.

[0010] Optionally, the filter screen is made of stainless steel and coated with a layer of polytetrafluoroethylene.

[0011] Optionally, the tool-free disassembly and assembly mechanism includes: an adapter block, a bidirectional self-locking screw, a first external thread, a second external thread, a first threaded sleeve, a second threaded sleeve, and a limiting guide rod;

[0012] The adapter block is fixed to the outer wall of the independent valve body. A bidirectional self-locking screw is rotatably connected to the adapter block. The lower half of the bidirectional self-locking screw is provided with a first external thread. A first threaded sleeve that mates with the first external thread is installed on the outer side of the first external thread. The upper half of the bidirectional self-locking screw is provided with a second external thread. A second threaded sleeve that mates with the second external thread is installed on the outer side of the second external thread. A limiting guide rod that is inserted into the outer wall of the independent valve body is fixed on both the first and second threaded sleeves. The limiting guide rod is slidably connected to the independent valve body. The independent valve body is provided with a limiting groove for the movement of the limiting guide rod. The first and second external threads have opposite directions of rotation.

[0013] Optionally, both the upper and lower ends of the outer frame are provided with insertion holes for inserting the first threaded sleeve and the second threaded sleeve.

[0014] Optionally, both the first external thread and the second external thread are fine-pitch trapezoidal threads, with a model number of Tr18×2.

[0015] Optionally, the multi-composite sealing ring includes: a main sealing layer, a deformation buffer compensation layer, and an auxiliary sealing layer, wherein the main sealing layer, the deformation buffer compensation layer, and the auxiliary sealing layer are fixed together in sequence, the main sealing layer is made of a high-density pressed graphite ring, the deformation buffer compensation layer is made of a medium-density flexible graphite ring, and the auxiliary sealing layer is made of a low-density soft graphite ring.

[0016] Optionally, the thickness of the main sealing layer is 5 mm, the thickness of the deformation buffer compensation layer is 4 mm, and the thickness of the auxiliary sealing layer is 3 mm.

[0017] The beneficial effects of this invention are as follows:

[0018] This invention uses two filters to filter the water entering the independent valve body, preventing impurities such as rust from clogging the pressure relief nozzle and ensuring safety during pressure relief. For cleaning, manually rotating the lever drives the bidirectional self-locking screw, which in turn moves the first and second threaded sleeves towards each other, dislodging them from the insertion hole. Then, pulling the pull handle moves the outer frame, along with the insertion half-ring and filter screen, out of the independent valve body, allowing for easy cleaning of the filter screen. In summary, this invention's dual-channel pressure relief valve device for cigarette factory boilers can intercept impurities, prevent flow channel blockage, and facilitate filter screen removal and cleaning through a tool-free disassembly structure. It is generally safe, reliable, and easy to maintain.

[0019] Other features and advantages of the invention will become clear from the following detailed description of exemplary embodiments of the invention with reference to the accompanying drawings. Attached Figure Description

[0020] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments of the invention and, together with their description, serve to explain the principles of the invention.

[0021] Figure 1 This is a structural diagram of the dual-channel pressure relief valve device for a cigarette factory boiler according to the present invention.

[0022] Figure 2 This is a structural diagram of the independent valve body of the present invention.

[0023] Figure 3 This is an exploded view of the dual-channel pressure relief valve device for a cigarette factory boiler according to the present invention.

[0024] Figure 4 This is a structural diagram of the tool-free assembly / disassembly mechanism of the present invention.

[0025] Figure 5 This is a structural diagram of the dual filtration mechanism of the present invention.

[0026] Figure 6 This is a cross-sectional view of the multi-composite sealing ring of the present invention.

[0027] The diagram shows the following: 1. Y-type dual-chamber main valve body; 101. First flange; 2. Independent sub-valve body; 201. Second flange; 202. Limiting groove; 203. Locking groove; 3. Dual filtration mechanism; 301. Insertion semi-ring; 302. Rubber sealing sleeve; 303. Filter screen; 304. Outer frame; 3041. Pull-out handle; 3042. Insertion hole; 4. Tool-free disassembly mechanism; 401. Adapter block; 402. Two-way self-locking screw; 4021. Actuating rod; 403. First external thread; 404. Second external thread; 405. First threaded sleeve; 406. Second threaded sleeve; 407. Limiting guide rod; 5. Multiple composite sealing rings; 501. Main sealing layer; 502. Deformation buffer compensation layer; 503. Auxiliary sealing layer; 6. Bolt fastening assembly. Detailed Implementation

[0028] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention.

[0029] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the invention or its application or use.

[0030] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

[0031] In all the examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0032] like Figures 1 to 6 As shown, this embodiment of the invention provides a dual-channel pressure relief valve device for a cigarette factory boiler, including a Y-type dual-chamber main valve body 1, an independent sub-valve body 2, a dual filtration mechanism 3, a tool-free disassembly and assembly mechanism 4, and multiple composite sealing rings 5.

[0033] There are two independent valve bodies 2. The two independent valve bodies 2 are fixed to the Y-type double-chamber main valve body 1 by bolt fastening assembly 6. The lower end of the Y-type double-chamber main valve body 1 is fixed with a first flange 101, which is used to connect the main pipeline of the boiler. The side of the independent valve body 2 is fixed with a second flange 201, which is used to connect the branch pipeline of the boiler. Multiple composite sealing rings 5 ​​are fixed at the end faces of the first flange 101 and the second flange 201 respectively. The sealing performance when connected to the boiler pipeline is increased by the multiple composite sealing rings 5.

[0034] It should be noted that the bolt fastening assembly 6 is a bolt of existing technology, which will not be described in detail here.

[0035] Each independent valve body 2 can be detachably installed with a dual filter mechanism 3 inserted inside it. The dual filter mechanism 3 filters the fluid in the independent valve body 2 to prevent impurities in the fluid from clogging the pressure relief nozzle. Each independent valve body 2 is also equipped with a tool-free disassembly mechanism 4 for fixing the dual filter mechanism 3, which allows for quick disassembly and assembly of the dual filter mechanism 3.

[0036] The dual filtration mechanism 3 includes a plug-in semi-ring 301, a rubber sealing sleeve 302, a filter screen 303, and an outer frame 304. There are two plug-in semi-rings 301, two rubber sealing sleeves 302, and two filter screens 303. Each plug-in semi-ring 301 is fixed with one filter screen 303. The two filter screens 303 are respectively inserted into the two ends of the independent valve body 2. A rubber sealing sleeve 302 is fixed on the outside of each plug-in semi-ring 301 to increase the sealing of the connection. The Y-type dual-chamber main valve body 1 is provided with a locking groove 203 for locking the plug-in semi-ring 301 and the rubber sealing sleeve 302. The two plug-in semi-rings 301 are fixedly connected by the outer frame 304.

[0037] Specifically, the two-end split filter screen 303 intercepts solid impurities such as rust, scale, and welding slag in the boiler medium from all directions, preventing the accumulation of impurities from clogging the valve cavity, pressure relief nozzle, and sealing parts of the independent valve body 2. This completely solves the core problems of reduced flow cross-section, decreased pressure relief efficiency, and valve body failure in traditional valves, continuously ensuring the accurate and rapid overpressure relief capability of the pressure relief valve and significantly reducing the safety hazards of boiler special equipment operation.

[0038] This invention uses two filters to filter the water entering the independent valve body, preventing impurities such as rust from clogging the pressure relief nozzle and ensuring safety during pressure relief. For cleaning, manually rotating the lever drives the bidirectional self-locking screw, which in turn moves the first and second threaded sleeves towards each other, dislodging them from the insertion hole. Then, pulling the pull handle moves the outer frame, along with the insertion half-ring and filter screen, out of the independent valve body, allowing for easy cleaning of the filter screen. In summary, this invention's dual-channel pressure relief valve device for cigarette factory boilers can intercept impurities, prevent flow channel blockage, and facilitate filter screen removal and cleaning through a tool-free disassembly structure. It is generally safe, reliable, and easy to maintain.

[0039] In one embodiment of the dual-channel pressure relief valve device for cigarette factory boilers of the present invention, such as Figure 1 , Figure 2 and Figure 5 As shown, a pull handle 3041 is fixed on the outer frame 304. The pull handle 3041 can be used as a gripping part. With the tool-free disassembly mechanism 4, the operator can directly hold the pull handle to pull out the entire dual filtration mechanism 3 from the independent valve body 2 without the need for external tools such as wrenches or pry bars. This avoids the problem of slippage and difficulty in grasping the force point caused by direct contact with the filter screen frame during disassembly and assembly, simplifies the disassembly operation of the dual filtration mechanism, and facilitates the quick on-site operation of filter screen washing, descaling, and impurity cleaning. On the other hand, during assembly, the pull handle 3041 can be held to push the dual filtration mechanism 3 smoothly into the independent valve body 2, ensuring that the plug-in semi-ring is accurately aligned and locked into the locking groove, preventing the filter screen 303 from tilting or misaligning during installation, ensuring that the rubber sealing sleeve is properly fitted, and ensuring the sealing effect.

[0040] In one embodiment of the dual-channel pressure relief valve device for cigarette factory boilers of the present invention, the filter screen 303 is made of stainless steel and coated with a layer of polytetrafluoroethylene to improve its smoothness.

[0041] Specifically, the filter screen 303 uses a stainless steel substrate with a polytetrafluoroethylene coating on the surface. Due to the high strength of the stainless steel substrate and its resistance to high-temperature steam and media corrosion in the boiler, it can resist the scouring and wear of welding slag and rust particles in the media, and is not easily deformed or damaged. This ensures the overall structural strength and filtration reliability of the filter screen, making it suitable for the high-temperature and pressure-bearing conditions of cigarette factory boilers and extending the service life of the filter screen 303 substrate.

[0042] In one embodiment of the dual-channel pressure relief valve device for cigarette factory boilers of the present invention, such as Figure 3 and Figure 4As shown, the tool-free disassembly and assembly mechanism 4 includes an adapter block 401, a bidirectional self-locking screw 402, a first external thread 403, a second external thread 404, a first threaded sleeve 405, a second threaded sleeve 406, and a limiting guide rod 407.

[0043] The adapter block 401 is fixed to the outer wall of the independent valve body 2. A bidirectional self-locking screw 402 is rotatably connected to the adapter block 401. The lower half of the bidirectional self-locking screw 402 is provided with a first external thread 403. A first threaded sleeve 405 that mates with the first external thread 403 is installed on the outer side of the first external thread 403. The upper half of the bidirectional self-locking screw 402 is provided with a second external thread 404. A second threaded sleeve 406 that mates with the second external thread 404 is installed on the outer side of the second external thread 404. A limiting guide rod 407 that is inserted into the outer wall of the independent valve body 2 is fixed on both the first threaded sleeve 405 and the second threaded sleeve 406. The limiting guide rod 407 is slidably connected to the independent valve body 2. The independent valve body 2 is provided with a limiting groove 202 for the movement of the limiting guide rod 407. The limiting effect of the limiting groove 202 makes the first threaded sleeve 405 and the second threaded sleeve 406 only able to move in a straight line and unable to rotate.

[0044] In use, rotating the bidirectional self-locking screw 402 drives the first threaded sleeve 405 and the second threaded sleeve 406 to move synchronously in opposite directions or in opposite directions in a linear motion. Relying on the cooperation between the limiting guide rod 407 and the upper limit slide groove 202 of the independent valve body 2, the rotation of the first threaded sleeve 405 and the second threaded sleeve 406 is restricted, and the rotational motion of the bidirectional self-locking screw 402 is converted into the linear displacement of the first threaded sleeve 405 and the second threaded sleeve 406, thereby realizing the locking and releasing of the dual filter mechanism 3. No wrench, bolts or other disassembly tools are required, which is suitable for the on-site operation conditions of short maintenance windows for cigarette factory boilers.

[0045] This invention only requires rotating the bidirectional self-locking screw 402 to complete the unlocking, disassembly, and locking positioning, simplifying the operation process, reducing the probability of human assembly errors, facilitating the quick removal of the filter screen 303 on-site for descaling and cleaning maintenance, and improving maintenance efficiency.

[0046] In one embodiment of the dual-channel pressure relief valve device for cigarette factory boilers of the present invention, such as Figure 3 and Figure 4As shown, both the upper and lower ends of the outer frame 304 are provided with insertion holes 3042 for inserting the first threaded sleeve 405 and the second threaded sleeve 406, realizing the positioning and locking cooperation between the tool-free disassembly mechanism 4 and the dual filter mechanism 3. When the bidirectional self-locking screw 402 drives the first threaded sleeve 405 and the second threaded sleeve 406 to move linearly towards each other, the ends of the first threaded sleeve 405 and the second threaded sleeve 406 can be directly inserted into the insertion holes 3042, forming a reliable locking position from the outside of the outer frame, firmly limiting the entire dual filter mechanism 3 inside the independent valve body 2, preventing the dual filter mechanism 3 from moving, shifting, or loosening under the high-speed flushing and pressure alternating impact of the boiler medium, ensuring that the insertion half-ring 301 is stably locked in the locking groove 203, and the rubber sealing sleeve 302 continuously adheres to the sealing surface, avoiding problems such as medium leakage and filter position shift that cause filter failure.

[0047] In one embodiment of the dual-channel pressure relief valve device for cigarette factory boilers of the present invention, the first external thread 403 and the second external thread 404 have opposite rotation directions, so that when the bidirectional self-locking screw 402 rotates, the first threaded sleeve 405 and the second threaded sleeve 406 move in opposite directions, and a plurality of actuating rods 4021 are fixed on the bidirectional self-locking screw 402.

[0048] In use, manually rotate the lever 4021 to drive the bidirectional self-locking screw 402 to rotate. The rotation of the bidirectional self-locking screw 402 drives the first threaded sleeve 405 and the second threaded sleeve 406 to move in opposite directions, which can simultaneously lock and release the insertion holes 3042 at both ends of the outer frame of the filter mechanism 3. This achieves synchronous locking and releasing at both ends, avoids tilting of the outer frame due to force on one side, ensures uniform force on the entire dual filter mechanism 3, prevents the insertion half-ring 301 from tilting and the rubber sealing sleeve 302 from being locally squeezed and deformed, and ensures reliable sealing.

[0049] In one embodiment of the dual-channel pressure relief valve device for cigarette factory boilers of the present invention, the first external thread 403 and the second external thread 404 are both fine-pitch trapezoidal threads, model Tr18×2, which gives them good self-locking function.

[0050] In one embodiment of the dual-channel pressure relief valve device for cigarette factory boilers of the present invention, such as Figure 6As shown, the multi-composite sealing ring 5 includes a main sealing layer 501, a deformation buffer compensation layer 502, and an auxiliary sealing layer 503. The main sealing layer 501, the deformation buffer compensation layer 502, and the auxiliary sealing layer 503 are fixed together in sequence. The main sealing layer 501 is made of high-density pressed graphite ring, which faces the medium directly to achieve the first main seal. The deformation buffer compensation layer 502 is made of medium-density flexible graphite ring, which has better elasticity and greater compression capacity. It is used to connect the upper and lower layers, alleviate pressure and temperature gradients, and improve the overall fit. The auxiliary sealing layer 503 is made of low-density soft graphite ring to prevent external dust and moisture from entering the sealing cavity.

[0051] Furthermore, the thickness of the main sealing layer 501 is 5mm, the thickness of the deformation buffer compensation layer 502 is 4mm, and the thickness of the auxiliary sealing layer 503 is 3mm.

[0052] The working principle of the dual-channel pressure relief valve device for cigarette factory boilers of the present invention is as follows: During use, the water flow entering the independent valve body 2 can be filtered through two filter screens 303, thereby preventing impurities such as rust in the water from clogging the pressure relief nozzle, thus ensuring safety during pressure relief; during cleaning, the lever 4021 is turned by hand to drive the bidirectional self-locking screw 402 to rotate. The rotation of the bidirectional self-locking screw 402 drives the first threaded sleeve 405 and the second threaded sleeve 406 to move towards each other, so that the first threaded sleeve 405 and the second threaded sleeve 406 are moved out of the insertion hole 3042. Then, the pull handle 3041 is pulled, so that the outer frame 304 drives the insertion half-ring 301 and the filter screen 303 to move out of the independent valve body 2, and then the filter screen 303 can be cleaned.

[0053] While specific embodiments of the invention have been described in detail by way of examples, those skilled in the art should understand that the examples are for illustrative purposes only and not intended to limit the scope of the invention. Those skilled in the art should understand that modifications can be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.

Claims

1. A dual-channel pressure relief valve device for a cigarette factory boiler, characterized in that, include: Y-type dual-chamber main valve body (1), independent sub-valve body (2), dual filtration mechanism (3), tool-free disassembly and assembly mechanism (4), and multiple composite sealing rings (5). There are two independent valve bodies (2). The two independent valve bodies (2) are respectively fixed to the Y-type double-chamber main valve body (1) by bolt fastening assembly (6). The lower end of the Y-type double-chamber main valve body (1) is fixed with a first flange (101). The side of the independent valve body (2) is fixed with a second flange (201). Multiple composite sealing rings (5) are fixed at the end faces of the first flange (101) and the second flange (201). A dual filter mechanism (3) can be detachably installed on each independent valve body (2). A tool-free disassembly and assembly mechanism (4) for fixing the dual filter mechanism (3) is installed on each independent valve body (2). The dual filtration mechanism (3) includes: a plug-in semi-ring (301), a rubber sealing sleeve (302), a filter screen (303), and an outer frame (304). There are two plug-in semi-rings (301), two rubber sealing sleeves (302), and two filter screens (303). Each plug-in semi-ring (301) is fixed with one filter screen (303). The two filter screens (303) are respectively inserted into the two ends of the independent valve body (2). A rubber sealing sleeve (302) is fixed on the outside of each plug-in semi-ring (301). The Y-type dual-chamber main valve body (1) is provided with a locking groove (203) for locking the plug-in semi-ring (301) and the rubber sealing sleeve (302). The two plug-in semi-rings (301) are fixedly connected by the outer frame (304).

2. The dual-channel pressure relief valve device for a cigarette factory boiler according to claim 1, characterized in that, A pull handle (3041) is fixed on the outer frame (304).

3. The dual-channel pressure relief valve device for a cigarette factory boiler according to claim 1, characterized in that, The filter screen (303) is made of stainless steel and has a polytetrafluoroethylene coating on its surface.

4. The dual-channel pressure relief valve device for a cigarette factory boiler according to claim 1, characterized in that, The tool-free disassembly and assembly mechanism (4) includes an adapter block (401), a bidirectional self-locking screw (402), a first external thread (403), a second external thread (404), a first threaded sleeve (405), a second threaded sleeve (406), and a limiting guide rod (407). The adapter block (401) is fixed to the outer wall of the independent valve body (2). A bidirectional self-locking screw (402) is rotatably connected to the adapter block (401). The lower half of the bidirectional self-locking screw (402) is provided with a first external thread (403). A first threaded sleeve (405) is installed on the outside of the first external thread (403) to cooperate with it. The upper half of the bidirectional self-locking screw (402) is provided with a second external thread (404). The outer side of the second external thread (404) A second threaded sleeve (406) is installed on the side to cooperate with it. Both the first threaded sleeve (405) and the second threaded sleeve (406) are fixed with a limiting guide rod (407) inserted into the outer wall of the independent sub-valve body (2). The limiting guide rod (407) is slidably connected to the independent sub-valve body (2). The independent sub-valve body (2) is provided with a limiting slide groove (202) for the movement of the limiting guide rod (407). The first external thread (403) and the second external thread (404) have opposite rotation directions.

5. The dual-channel pressure relief valve device for a cigarette factory boiler according to claim 4, characterized in that, Both ends of the outer frame (304) are provided with insertion holes (3042) for inserting the first threaded sleeve (405) and the second threaded sleeve (406).

6. The dual-channel pressure relief valve device for a cigarette factory boiler according to claim 4, characterized in that, The first external thread (403) and the second external thread (404) are both fine-pitch trapezoidal threads, with the model number Tr18×2.

7. The dual-channel pressure relief valve device for a cigarette factory boiler according to claim 1, characterized in that, The multi-composite sealing ring (5) includes a main sealing layer (501), a deformation buffer compensation layer (502), and an auxiliary sealing layer (503). The main sealing layer (501), the deformation buffer compensation layer (502), and the auxiliary sealing layer (503) are fixed together in sequence. The main sealing layer (501) is made of high-density pressed graphite ring, the deformation buffer compensation layer (502) is made of medium-density flexible graphite ring, and the auxiliary sealing layer (503) is made of low-density soft graphite ring.

8. The dual-channel pressure relief valve device for a cigarette factory boiler according to claim 7, characterized in that, The thickness of the main sealing layer (501) is 5 mm, the thickness of the deformation buffer compensation layer (502) is 4 mm, and the thickness of the auxiliary sealing layer (503) is 3 mm.

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