Split type fire-retardant breather valve

Abstract

The invention relates to the technical field of breather valves, in particular to a split type fire-retardant breather valve which comprises a main valve body, a valve pipe is arranged at the side end of the main valve body, the main valve body is communicated with a storage tank in a sealed mode through the valve pipe, and the upper end and the lower end of the main valve body are connected with an exhalation end and a suction end respectively. Guide cavity valve bodies, flame-retardant liquid valve seats and pressure valve body assemblies are arranged in the exhalation end and the inhalation end. When the bidirectional flame-retardant storage tank is used, even if gas in the storage tank burns at the suction end or gas outside the storage tank burns at the exhalation end, rotation can be limited through abutting of the limiting rod against the hinge, and the sealing pressure plate in the pressure valve body assembly a at the exhalation end serves as an isolation piece, so that the bidirectional flame-retardant effect is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of breathing valves, and in particular to a split-type fire-blocking breathing valve. Background Art

[0002] A breathing valve is a valve that can not only ensure that the storage tank is isolated from the atmosphere within a certain pressure range, but can also communicate with the atmosphere (breathe) when the pressure exceeds or falls below this pressure range. Its function is to prevent the storage tank from being damaged due to overpressure or vacuum, and at the same time reduce the evaporation loss of the stored liquid. Setting a breathing valve can not only reduce the gas emission in the tank, thereby reducing the pollution to the atmosphere, but also prevent the storage tank from being damaged due to overpressure or instability due to ultra-vacuum, which plays a certain role in promoting safety and environmental protection.

[0003] The breathing valve is mainly composed of a valve seat, a valve cover, a protective cover and two sets of opening and closing devices controlled by vacuum and pressure. The opening and closing devices include valve discs, guide rods, springs, spring seats and sealing rings. When the pressure in the tank reaches the rated exhalation positive pressure, the pressure valve body assembly disc opens and the steam in the tank is discharged; when the vacuum in the tank reaches the rated inhalation negative pressure, the vacuum valve disc opens and air enters.

[0004] Some traditional pipe-end fire-blocking breathing valves are generally used in combination with pipe-end fire-blocking breathing valves and flame arresters. Since the flame arrester is based on the blocking effect of the wall effect and heat conduction, it is practical to cut off the one-way fire source and cool down the channel. However, due to the uncertainty of the occurrence of fire sources in complex situations, it is impossible to block the fire in the unblocked direction of the flame arrester, thereby losing the corresponding fire blocking ability. Therefore, those skilled in the art provide a split fire-blocking breathing valve to solve the problems raised in the above background technology. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides a split type fire-retardant breathing valve, comprising a main valve body, a valve pipe is provided at the side end of the main valve body, and is sealed and connected with a storage tank through the valve pipe, and the upper and lower ends of the main valve body are connected with an exhalation end and an inhalation end, and the exhalation end and the inhalation end are both provided with a guide cavity valve body, a flame retardant liquid valve seat and a pressure valve body assembly;

[0006] The flame retardant liquid valve seat includes a flame retardant liquid container, a ring plate, an outer ring cavity, a pressurized inner cavity, a connecting flange and a liquid flow port. A ring plate is arranged on the inner side of the flame retardant liquid container, and the ring plate divides the inner cavity of the flame retardant liquid container into a pressurized inner cavity inside the ring plate and an outer ring cavity formed between the ring plate and the flame retardant liquid container. A connecting flange is fixedly installed along the edge of the upper end surface of the flame retardant liquid container and the upper end surface of the ring plate. A liquid flow port is opened on the wall side of the flame retardant liquid container. Since the valve seat opening at the upper end of the pressurized inner cavity is inconsistent with the air pressure outside the liquid flow port, the flame retardant liquid in the flame retardant liquid container can flow out through the low-pressure port.

[0007] Preferably: the main valve body is connected to the exhalation end and is assembled by a pressure valve body assembly a, a guide cavity valve body a, a flame retardant liquid valve seat a and a fire-blocking mechanism at the exhalation end, and the main valve body is connected to the suction end and is assembled by a guide cavity valve body b, a flame retardant liquid valve seat b, a pressure valve body assembly b and a fire-blocking mechanism at the suction end.

[0008] Preferably: the main valve body is connected to the guide cavity valve body b built into the suction end, and the left end is connected to the suction end fire-blocking mechanism. A pressure valve body assembly b is arranged on the upper left side of the suction end fire-blocking mechanism, and a flame retardant liquid valve seat b is arranged on the lower left side of the suction end fire-blocking mechanism. The flame retardant liquid valve seat b is fixed to the pressure valve body assembly b by a flange.

[0009] Preferably: the suction end fire-blocking mechanism includes a device assembly, an exhaust chamber end, a mixing inlet port, a reflux tube cavity, an upper air partition plate, a guide plate, a stop rod, a movable leaf, a limit plate, an air inlet, a loose leaf and a limit rod. An exhaust chamber end is opened on the right side of the device assembly, and the right port of the exhaust chamber end is connected to the guide chamber valve body. A rotatable loose leaf is arranged on the upper and lower walls of the interrupted chamber of the exhaust chamber end. The loose leaf is a centrally symmetrical upper and lower notched leaf plate. A limit rod is arranged in the middle of the left side of the loose leaf. A mixing inlet port is opened on the left side of the exhaust chamber end. The other end of the mixing inlet port is connected to the pressure valve body component b. A reflux lumen is opened at the lower side of the right port of the air cavity end, and the other end of the reflux lumen is connected to the flame retardant liquid valve seat b. The exhaust cavity end and the mixing inlet port connecting port are fixedly installed with upper air partition plates that are staggered up and down. The mixing inlet port and the reflux lumen connecting port are fixedly installed with a guide plate. The upper air partition plate is used to block the flow of the flame retardant liquid, and the corresponding inhaled air enters the guide cavity valve body b through the exhaust cavity end. The guide plate cooperates to guide the flame retardant liquid to flow back into the flame retardant liquid valve seat b through the reflux lumen, thereby separating the outside air entering the mixing inlet port and the flame retardant liquid at the three-way port.

[0010] Preferably: a rotatable movable leaf is provided on the upper and lower walls of the middle section of the reflux tube cavity, and the movable leaf is sealed with a centrally symmetrical notched leaf plate. A push rod is provided in the middle of the right side of the movable leaf, and the push rod is fixed between the front and rear inner walls of the cavity of the reflux tube cavity to limit the rightward rotation of the movable leaf, so that the movable leaf can only be opened in one direction on the left side. An air inlet is provided on the right side of the upper wall of the reflux tube cavity, and air is introduced into the suction end through the air inlet to prepare for air intake for the negative pressure of the storage tank. A limit plate is provided on the lower side of the air inlet to ensure that the reflux flame retardant liquid does not flow into the air inlet, thereby reducing overflow.

[0011] Preferably: the right end of the main valve body connected to the pressure valve body assembly a built into the exhalation end is connected to the guide cavity valve body a, the lower end flange of the guide cavity valve body a is connected to the flame retardant liquid valve seat a, and the guide cavity valve body a is connected to the right side of the flame retardant liquid valve seat a to accommodate the exhalation end fire blocking mechanism.

[0012] Preferably: the exhalation end fire-blocking mechanism includes a mixing inlet pipe, a reflux pipe, an upper pressure pipe, an outlet pipe, a guide ramp, an anti-rotation rod and a one-way hinge, an upper pressure pipe is arranged between the right end port of the mixing inlet pipe and the right end port of the reflux pipe, the upper end port of the upper pressure pipe is connected to the outlet pipe, and a guide ramp is fixedly installed on the lower side of the outlet pipe, and the guide ramp prevents the flame retardant liquid from leaking out of the outlet pipe due to the high-intensity pressure of the high-pressure gas.

[0013] Preferably, the upper and lower walls of the middle cavity of the return pipe are provided with rotatable one-way hinges, the one-way hinges are centrally symmetrical notched hinges on the upper and lower sides and are arranged in a sealed manner, and an anti-rotation rod is provided in the middle of the right side of the one-way hinge.

[0014] Preferably: the pressure valve body assembly includes a pressure valve body assembly body, a limiting sliding rod seat, a pressure valve body assembly seat, a valve actuator, a return spring, a sealing pressure plate, a sealing slot and a valve wall opening, a pressure valve body assembly seat is arranged above the pressure valve body assembly body, a limiting slot is provided in the middle of the lower end surface of the pressure valve body assembly seat, a slidable valve actuator is arranged in the limiting slot, a return spring is provided on the upper part of the valve actuator rod, the return spring is arranged in the pressure valve body assembly seat, a sealing pressure plate is fixedly arranged at the lower end of the valve actuator rod, and a valve wall opening is provided on the wall side of the pressure valve body assembly body.

[0015] Preferably: a plurality of limit slide rod seats are annularly installed on the inner wall of the pressure valve body assembly, and a plurality of sealing slots are opened on the upper end surface of the sealing pressure plate, which is slidingly connected with the limit slide rod of the limit slide rod seat through the sealing slots, so that the valve actuator drives the sealing pressure plate to move in a directional manner within the inner cavity of the limit slide rod seat, so that the lower end surface of the valve body is connected with the valve wall port.

[0016] Technical effects and advantages of the present invention:

[0017] 1. When the present invention is used, whether it is the process of balancing the air pressure in the storage tank for intake pressure replenishment or exhaust pressure reduction, it will be in close contact with the flame retardant liquid in the flame retardant liquid container and be immersed in it to cut off the combustion transmission, so as to ensure the safety of the split breathing valve.

[0018] 2. When the present invention is used, even if the gas in the storage tank burns at the inhalation end or the gas outside the storage tank burns at the exhalation end, the limit rod can limit the rotation of the hinge and the sealed pressure plate in the pressure valve body assembly a at the exhalation end can serve as an isolation member, thereby forming a two-way flame retardant effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the structure provided by this application;

[0020] Figure 2 It is a cross-sectional view provided by this application;

[0021] Figure 3It is a structural schematic diagram of the suction end fire-blocking mechanism provided by the present application;

[0022] Figure 4 It is a structural schematic diagram of the fire blocking mechanism at the exhalation end provided by the present application;

[0023] Figure 5 It is a structural schematic diagram of the flame retardant liquid valve seat provided by the present application;

[0024] Figure 6 is a structural schematic diagram of a pressure valve body assembly provided by the present application;

[0025] In the figure: 1. Main valve body; 2. Valve pipe; 3. Suction end fire blocking mechanism; 4. Exhalation end fire blocking mechanism; 5. Guide cavity valve body; 6. Flame retardant liquid valve seat; 7. Pressure valve body assembly;

[0026] 31. Device assembly; 32. Exhaust chamber end; 33. Mixing inlet port; 34. Reflux tube chamber; 35. Upper air partition plate; 36. Guide plate; 37. Stop rod; 38. Active leaf; 39. Limit plate; 310. Air inlet; 311. Active leaf; 312. Limit rod;

[0027] 41. Mixing inlet pipe; 42. Return pipe; 43. Upper pressure pipe; 44. Exhaust pipe; 45. Guide inclined plate; 46. Anti-rotation rod; 47. One-way loose-leaf;

[0028] 61. Flame retardant liquid container; 62. Ring plate; 63. Outer ring cavity; 64. Pressurized inner cavity; 65. Connecting flange; 66. Liquid flow port;

[0029] 71. Pressure valve body assembly; 72. Limiting slide rod seat; 73. Pressure valve body assembly seat; 74. Valve actuator; 75. Return spring; 76. Sealing pressure plate; 77. Sealing slot hole; 78. Valve wall opening. DETAILED DESCRIPTION

[0030] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. The embodiments of the present invention are provided for the purpose of illustration and description, and are not intended to be exhaustive or to limit the present invention to the disclosed forms. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments are selected and described in order to better illustrate the principles and practical applications of the present invention, and to enable those of ordinary skill in the art to understand the present invention and thereby design various embodiments with various modifications suitable for specific uses.

[0031] See also Figures 1-2In this embodiment, a split-type flame-retardant breathing valve is provided, including a main valve body 1, a valve pipe 2 is opened at the side end of the main valve body 1, and is sealed and connected with a storage tank through the valve pipe 2. The upper and lower ends of the main valve body 1 are connected with an exhalation end and an inhalation end, and a guide cavity valve body 5, a flame retardant liquid valve seat 6 and a pressure valve body assembly 7 are arranged in the exhalation end and the inhalation end. The exhalation end is assembled by a pressure valve body assembly a7, a guide cavity valve body a5, a flame retardant liquid valve seat a6 and an exhalation end flame-retardant mechanism 4, and the inhalation end is assembled by a guide cavity valve body b5, a flame retardant liquid valve seat b6, a pressure valve body assembly b7 and an inhalation end flame-retardant mechanism 3.

[0032] like Figure 3 As shown, the left end of the guide cavity valve body b5 built into the suction end is connected to the suction end fire-blocking mechanism 3, the pressure valve body assembly b7 is arranged at the upper left part of the suction end fire-blocking mechanism 3, and the flame retardant liquid valve seat b6 is arranged at the lower left part of the suction end fire-blocking mechanism 3, and the flame retardant liquid valve seat b6 is fixed to the pressure valve body assembly b7 by a flange, and the suction end fire-blocking mechanism 3 includes a device assembly 31, an exhaust cavity end 32, a mixing inlet port 33, a reflux tube cavity 34, an upper air partition plate 35, a guide plate 36, a stop rod 37, a movable leaf 38, a limit plate 39, an air inlet 310, a movable leaf 311 and a limit rod 312. An exhaust chamber end 32 is provided on the right side of the device assembly 31, and the right port of the exhaust chamber end 32 is connected to the guide chamber valve body 5. The upper and lower walls of the exhaust chamber end 32 are provided with rotatable hinges 311. The hinges 311 are two upper and lower notched leaf plates symmetrically located at the center. A limit rod 312 is provided in the middle of the left side of the hinge 311. A mixing inlet port 33 is provided on the left side of the exhaust chamber end 32, and the other end of the mixing inlet port 33 is connected to the pressure valve body component b7. A reflux tube chamber 34 is provided on the lower side of the right port of the exhaust chamber end 32, and the other end of the reflux tube chamber 34 is connected to the flame retardant liquid valve seat b6. The exhaust chamber end 32 is connected to The mixing inlet port 33 is fixedly installed with an upper air partition plate 35 staggered up and down, and the mixing inlet port 33 and the return tube cavity 34 are fixedly installed with a guide plate 36. The upper air partition plate 35 is used to block the flow of the flame retardant liquid, and the corresponding inhaled air enters the guide cavity valve body b5 through the exhaust cavity end 32, and cooperates with the guide plate 36 to guide the flame retardant liquid to flow back to the flame retardant liquid valve seat b6 through the return tube cavity 34, so that the outside air entering the mixing inlet port 33 and the flame retardant liquid are separated into gas and liquid at the three-way port. The upper and lower walls of the middle section of the return tube cavity 34 are provided with rotatable The movable page 38 is sealed with a centrally symmetrical notched page plate. A push rod 37 is provided in the middle of the right side of the movable page 38. The push rod 37 is fixed between the front and rear inner walls of the reflux tube cavity 34 to limit the rightward rotation of the movable page 38, so that the movable page 38 can only be opened in one direction on the left side. An air inlet 310 is provided on the right side of the upper wall of the reflux tube cavity 34. Air is introduced into the suction end through the air inlet 310 to prepare for air intake for the negative pressure of the storage tank. A limit plate 39 is provided on the lower side of the air inlet 310 to ensure that the reflux flame retardant liquid does not flow into the air inlet 310, thereby reducing overflow.

[0033] like Figure 4 As shown, the right end of the pressure valve body assembly a7 built into the exhalation end is connected to the guide cavity valve body a5, and the lower end flange of the guide cavity valve body a5 is connected to the flame retardant liquid valve seat a6. The guide cavity valve body a5 is connected to the right side of the flame retardant liquid valve seat a6 to arrange the exhalation end fire blocking mechanism 4, and the exhalation end fire blocking mechanism 4 includes a mixing inlet pipe 41, a return pipe 42, an upper pressure pipe 43, an air outlet pipe 44, a guide inclined plate 45, an anti-rotation rod 46 and a one-way loose-leaf 47. An upper pressure pipe 43 is arranged between the right end port of the mixing inlet pipe 41 and the right end port of the return pipe 42, and the upper end port of the upper pressure pipe 43 is connected to the air outlet pipe 44. The lower side of the air outlet pipe 44 is fixed A guide inclined plate 45 is fixedly installed to prevent the flame retardant liquid from leaking out of the outlet pipe 44 due to the high-intensity pressure of the high-pressure gas. A rotatable one-way hinge 47 is arranged on the upper and lower walls of the middle cavity of the reflux pipe 42. The one-way hinge 47 is a centrally symmetrical notched hinge on the upper and lower sides and is sealed. An anti-rotation rod 46 is arranged in the middle of the right side of the one-way hinge 47. The flame retardant liquid and the gas in the storage tank cavity are separated by the upper pressure pipe 43 through the mixing inlet pipe 41, and the gas and liquid are separated at the intersection of the reflux pipe 42 and the outlet pipe 44. The flame retardant liquid will be opened by the one-way rotation of the one-way hinge 47 and flow back into the flame retardant liquid valve seat a6.

[0034] like Figure 5 As shown, the flame retardant liquid valve seat 6 includes a flame retardant liquid container 61, a ring plate 62, an outer ring cavity 63, a pressurized inner cavity 64, a connecting flange 65 and a liquid flow port 66. A ring plate 62 is arranged on the inner side of the flame retardant liquid container 61, and the ring plate 62 divides the inner cavity of the flame retardant liquid container 61 into a pressurized inner cavity 64 inside the ring plate 62 and an outer ring cavity 63 formed between the ring plate 62 and the flame retardant liquid container 61. A connecting flange 65 is fixedly installed along the edge of the upper end surface of the flame retardant liquid container 61 and the upper end surface of the ring plate 62. A liquid flow port 66 is opened on the wall side of the flame retardant liquid container 61. Since the valve seat opening at the upper end of the pressurized inner cavity 64 is inconsistent with the external air pressure of the liquid flow port 66, the flame retardant liquid in the flame retardant liquid container 61 can flow out through the low-pressure port.

[0035] like Figure 6As shown, the pressure valve body assembly 7 includes a pressure valve body assembly body 71, a limit slide rod seat 72, a pressure valve body assembly seat 73, a valve actuator rod 74, a return spring 75, a sealing pressure plate 76, a sealing slot hole 77 and a valve wall opening 78. A plurality of limit slide rod seats 72 are annularly installed on the inner wall of the pressure valve body assembly body 71, and a pressure valve body assembly seat 73 is arranged above the pressure valve body assembly body 71. A limit groove is provided in the middle of the lower end surface of the pressure valve body assembly seat 73, and a slidable valve actuator rod 74 is built in the limit groove. A return spring 75 is sleeved on the upper part of the rod 74, and the return spring 75 is placed in the pressure valve body assembly seat 73. A sealing pressure plate 76 is fixedly placed at the lower end of the valve actuator 74. A plurality of sealing grooves 77 are provided on the upper end surface of the sealing pressure plate 76. A valve wall opening 78 is provided on the wall side of the pressure valve body assembly body 71, and is slidably connected with the limit slide bar on the limit slide bar seat 72 through the sealing grooves 77. Thus, the valve actuator 74 drives the sealing pressure plate 76 to move in a directional manner in the inner cavity of the limit slide bar seat 72, so that the lower end surface of the valve body is connected with the valve wall opening 78.

[0036] The working principle of the present invention is:

[0037] When the present invention is used, when the gas in the storage tank presents a negative pressure, it is restricted by the valve pipe 2 connecting to the suction end on the lower side. At this time, the air pressure on the side of the valve wall opening 78 in the pressure valve body component a7 is lower than the air pressure at the lower port of the pressure valve body component 71, so that the flame retardant liquid in the flame retardant liquid container 61 and the air inhaled by the air inlet 310 flow into the suction end fire-blocking mechanism 3 through the valve wall opening 78 in the pressure valve body component a7, and the upper air partition plate 35 is used to block the flow of the flame retardant liquid, and the guide plate 36 cooperates to guide the flame retardant liquid to flow back to the flame retardant liquid valve seat b6 through the movable leaf 38 in the reflux tube cavity 34, so that the corresponding inhaled air enters the guide cavity valve body b5 through the exhaust cavity end 32, forming a cyclic air intake pressure replenishment; when the gas in the storage tank presents a high pressure, it is restricted by the valve pipe 2 connecting to the exhalation end on the upper side. At this time, the air pressure on the side of the valve wall opening 78 in the pressure valve body component b7 is lower than the air pressure at the lower port of the pressure valve body component 71, and the storage The gas in the tank will press the high-pressure gas onto the pressurized inner cavity 64 through the guide cavity valve body 5, so that the flame retardant liquid in the outer ring cavity 63 is squeezed upward through the mixing inlet pipe 41. At this time, the one-way hinge 47 will open to the left and flow into the flame retardant liquid valve seat a6, and the gas in the storage tank will be exhaled out through the outlet pipe 44, forming a cyclic exhaust and decompression. For the breathing valve body, whether it is the process of balancing the air pressure in the storage tank for intake pressure replenishment or exhaust pressure reduction, it will be in close contact with the flame retardant liquid in the flame retardant liquid container 61 to cut off the combustion transmission, so as to ensure the safety of the split breathing valve. At the same time, even if the gas in the storage tank burns at the inhalation end or the gas outside the storage tank burns at the exhalation end, the rotation of the hinge 311 can be restricted by the limit rod 312, and the sealing pressure plate 76 in the pressure valve body assembly a7 at the exhalation end is used as an isolation member, thereby forming a two-way flame retardant effect.

[0038] Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field and related fields without creative work should fall within the scope of protection of the present invention. The structures, devices and operating methods not specifically described and explained in the present invention are implemented according to the conventional means in the field unless otherwise specified and limited.

Claims

1. A split type fire-stop breathing valve, comprising a main valve body (1), characterized in that: The main valve body (1) is provided with a valve pipe (2) at the side end thereof, and is sealedly connected to the storage tank through the valve pipe (2). The main valve body (1) is connected to an exhalation end and an inhalation end at the upper and lower ends thereof, and a guide cavity valve body (5), a flame retardant liquid valve seat (6) and a pressure valve body assembly (7) are arranged in the exhalation end and the inhalation end; The flame retardant liquid valve seat (6) comprises a flame retardant liquid container (61), a ring plate (62), an outer ring cavity (63), a pressurized inner cavity (64), a connecting flange (65) and a liquid flow port (66). A ring plate (62) is arranged on the inner side of the flame retardant liquid container (61). The ring plate (62) divides the inner cavity of the flame retardant liquid container (61) into a pressurized inner cavity (64) on the inner side of the ring plate (62) and an outer ring cavity (63) formed between the ring plate (62) and the flame retardant liquid container (61). A connecting flange (65) is fixedly installed along the edge of the upper end surface of the flame retardant liquid container (61) and the upper end surface of the ring plate (62). A liquid flow port (66) is provided on the wall side of the flame retardant liquid container (61).

2. A split type fire-stop breathing valve according to claim 1, characterized in that: The main valve body (1) is connected to the exhalation end and is assembled from a pressure valve body assembly a (7), a guide cavity valve body a (5), a flame retardant liquid valve seat a (6) and an exhalation end fire-blocking mechanism (4). The main valve body (1) is connected to the inhalation end and is assembled from a guide cavity valve body b (5), a flame retardant liquid valve seat b (6), a pressure valve body assembly b (7) and an inhalation end fire-blocking mechanism (3).

3. A split type fire-stop breathing valve according to claim 1, characterized in that: The main valve body (1) is connected to a guide cavity valve body b (5) built into the suction end at the lower end, and the left end is connected to the suction end fire-blocking mechanism (3). A pressure valve body assembly b (7) is arranged at the upper left part of the suction end fire-blocking mechanism (3). A flame retardant liquid valve seat b (6) is arranged at the lower left part of the suction end fire-blocking mechanism (3). The flame retardant liquid valve seat b (6) and the pressure valve body assembly b (7) are fixed by a flange.

4. A split type fire-stop breathing valve according to claim 2, characterized in that: The suction end flame arresting mechanism (3) comprises a device assembly (31), an exhaust cavity end (32), a mixing inlet port (33), a reflux tube cavity (34), an upper air partition plate (35), a guide plate (36), a stop rod (37), a movable leaf (38), a limit plate (39), an air inlet (310), a hinge (311) and a limit rod (312). The exhaust cavity end (32) is provided on the right side of the device assembly (31), the right port of the exhaust cavity end (32) is connected to the guide cavity valve body (5), and the upper and lower walls of the exhaust cavity end (32) are provided with a rotatable hinge (311), and the hinge (311) is centered on the exhaust cavity end (32). The invention discloses a valve body having two notched leaf plates, a limit rod (312) is arranged in the middle of the left side of the movable leaf (311), a mixing inlet port (33) is arranged on the left side of the exhaust chamber end (32), the other end of the mixing inlet port (33) is communicated with the pressure valve body component b (7), a reflux tube cavity (34) is arranged on the lower side of the right port of the exhaust chamber end (32), the other end of the reflux tube cavity (34) is connected with the flame retardant liquid valve seat b (6), the connection port between the exhaust chamber end (32) and the mixing inlet port (33) is fixedly installed with an upper air partition plate (35) staggered in an upper and lower manner, and the connection port between the mixing inlet port (33) and the reflux tube cavity (34) is fixedly installed with a guide plate (36).

5. A split type fire-stop breathing valve according to claim 4, characterized in that: The upper and lower walls of the middle section of the reflux tube cavity (34) are provided with rotatable movable leaves (38), and the movable leaves (38) are sealed with a centrally symmetrical notched leaf plate. A push rod (37) is provided in the middle of the right side of the movable leaf (38), and the push rod (37) is fixed between the front and rear inner walls of the cavity of the reflux tube cavity (34) to limit the rightward rotation of the movable leaf (38), so that the movable leaf (38) can only be opened in one direction on the left side. An air inlet (310) is provided on the right side of the upper wall of the reflux tube cavity (34), and a limit plate (39) is provided on the lower side of the air inlet (310).

6. A split type fire-stop breathing valve according to claim 1, characterized in that: The main valve body (1) is connected to the right end of the pressure valve body assembly a (7) built into the exhalation end and is connected to the guide cavity valve body a (5). The lower end flange of the guide cavity valve body a (5) is connected to the flame retardant liquid valve seat a (6). The guide cavity valve body a (5) is connected to the right side of the flame retardant liquid valve seat a (6) to accommodate the exhalation end fire blocking mechanism (4).

7. A split type fire-stop breathing valve according to claim 2, characterized in that: The exhalation end fire blocking mechanism (4) comprises a mixing inlet pipe (41), a return pipe (42), an upper pressure pipe (43), an air outlet pipe (44), a guide inclined plate (45), an anti-rotation rod (46) and a one-way hinge (47); an upper pressure pipe (43) is arranged between the right end port of the mixing inlet pipe (41) and the right end port of the return pipe (42); the upper end port of the upper pressure pipe (43) is connected to the air outlet pipe (44); and a guide inclined plate (45) is fixedly installed on the lower side of the inner side of the air outlet pipe (44).

8. A split type fire-stop breathing valve according to claim 7, characterized in that: The upper and lower walls of the middle cavity of the return pipe (42) are provided with rotatable one-way hinges (47). The one-way hinge (47) is a hinge with central symmetrical notches on the upper and lower sides, which is sealed and arranged together. An anti-rotation rod (46) is provided in the middle of the right side of the one-way hinge (47).

9. A split type fire-stop breathing valve according to claim 1, characterized in that: The pressure valve body assembly (7) comprises a pressure valve body assembly body (71), a limiting sliding rod seat (72), a pressure valve body assembly seat (73), a valve actuator (74), a return spring (75), a sealing pressure plate (76), a sealing slot (77) and a valve wall opening (78); a pressure valve body assembly seat (73) is arranged above the pressure valve body assembly body (71); a limiting slot is provided in the middle of the lower end surface of the pressure valve body assembly seat (73); a slidable valve actuator (74) is arranged in the limiting slot; a return spring (75) is sleeved on the upper part of the valve actuator (74); the return spring (75) is arranged in the pressure valve body assembly seat (73); a sealing pressure plate (76) is fixedly arranged at the lower end of the valve actuator (74); and a valve wall opening (78) is provided on the wall side of the pressure valve body assembly body (71).

10. A split type fire-stop breathing valve according to claim 9, characterized in that: A plurality of limit slide rod seats (72) are annularly mounted on the inner wall of the pressure valve body assembly (71); a plurality of sealing slots (77) are provided on the upper end surface of the sealing pressure plate (76); the sealing slots (77) are slidably connected to the limit slide rods on the limit slide rod seat (72); thereby, the valve actuator (74) drives the sealing pressure plate (76) to move in a directional manner within the inner cavity of the limit slide rod seat (72), so that the lower end surface of the valve body is connected to the valve wall opening (78).

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