Fireproof check valve

Abstract

The utility model discloses a fireproof check valve which comprises a valve body and a valve body, and the valve body is hinged in the valve body through a reset structure and forms a normally-closed opening and closing structure which can be opened when being impacted by airflow. The reset structure comprises a reset arm, a reset spring, a hinge seat and a hinge piece, the hinge seat is fixed to the valve body, one end of the hinge piece is hinged to the hinge seat, the other end of the hinge piece is connected with the valve, the reset arm is hinged to the hinge seat through a long rivet, and the reset spring penetrates through the long rivet and abuts against the reset arm and the hinge seat. The end of the reset arm abuts against the center of the valve under the acting force of the reset spring. According to the fireproof check valve, the valve is hinged to the interior of the valve body through the reset structure and forms a normally-closed opening and closing structure which can be opened when being impacted by airflow; the end of the reset arm abuts against the center of the valve under the acting force of the reset spring, the stress center of the valve is diffused outwards from the center, stress is even, and therefore the valve is not prone to loosening when closed, leakproofness is better, and the effect of preventing airflow of the public smoke exhaust flue from flowing backwards is better.

Description

Technical Field

[0001] The utility model relates to the technical field of smoke exhaust duct matching devices, in particular to a fire-proof check valve. Background Art

[0002] High-rise buildings must be equipped with public smoke exhaust ducts. The exhaust pipes of each household's range hoods, exhaust fans and other exhaust equipment are connected to the public smoke exhaust duct. The exhaust gas is guided to the roof and discharged through the public smoke exhaust duct. In order to prevent the exhaust gas in the public smoke exhaust duct from flowing back into the residents' rooms, fire check valves need to be installed at the access points of each household's public smoke exhaust duct.

[0003] The fire check valve in the prior art includes a valve body, a valve, a reset arm and a torsion spring. The valve is hinged on the valve body, and the two ends of the reset arm are respectively hinged on the valve body and the valve. The torsion spring suppresses the reset arm and provides a return force for the reset arm. When the airflow hits the valve from one end of the room, it can overcome the torsion of the torsion spring, open the valve, and discharge the indoor exhaust gas into the public smoke exhaust duct. When there is no airflow to be discharged at one end of the room, the torsion spring rebounds and suppresses the reset arm to close the valve.

[0004] The reset arm of the existing check valve is connected to the edge of the valve, and the closing force point is on the edge, which makes the valve easy to loosen when closed, resulting in poor airtightness, thereby causing the airflow of the public smoke exhaust duct to flow back. Utility Model Content

[0005] The utility model aims to provide a fireproof check valve, which has a simple and compact structure, is tightly closed and has good airtightness.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a fire-proof check valve, comprising a valve body and a valve, wherein the valve is hinged in the valve body through a reset structure and forms a normally closed opening and closing structure that can be opened when an airflow impacts;

[0007] The reset structure includes a reset arm, a reset spring, an articulated seat and an articulated component, wherein the articulated seat is fixed to the valve body, one end of the articulated component is articulated to the articulated seat, and the other end of the articulated component is connected to the valve, the reset arm is articulated to the articulated seat through a long rivet, and the reset spring passes through the long rivet and is disposed against the reset arm and the articulated seat;

[0008] The end of the reset arm is pressed against the center of the valve under the action force of the reset spring.

[0009] In the above technical solution, the hinge seat is provided with a first adjustment position and a second adjustment position which can be used to adjust the elastic force of the return spring; the second adjustment position is located outside the first adjustment position.

[0010] In the above technical solution, the slot depth of the second adjustment position is lower than the slot depth of the first adjustment position; and the first adjustment position is arranged to be inclined with respect to the second adjustment position.

[0011] In the above technical solution, the hinge seat is provided with a notch for avoiding interference caused by the movement of the reset arm, and the width of the notch is greater than the width of the reset arm.

[0012] In the above technical solution, the reset arm is provided with a protrusion for contacting with the reset spring.

[0013] In the above technical solution, the reset spring is wound with two torsion coils, and an interference portion that cooperates with the protrusion is provided between the two torsion coils. A locking portion is extended from the outer ends of the two torsion coils, and the locking portion is locked in the first adjustment position or the second adjustment position.

[0014] The above technical solution also includes a fire protection mechanism, which is installed between the valve body and the hinge seat.

[0015] The valve body is provided with a flow guide cover, and the flow guide cover is provided with a long guide hole. The long guide hole is arranged obliquely, and the oblique direction intersects with the oblique direction of the valve.

[0016] In the above technical solution, the fire prevention mechanism includes a fire prevention arm, an action spring, a blocking member and a fuse mechanism; the fuse mechanism is installed on the hinged seat, the blocking member is connected to the fuse mechanism and a long rivet is passed through the blocking member to enable the blocking member to be installed on the hinged seat, a hook is provided on the valve body, the fire prevention arm is inserted into the guide long hole and can slide along the guide long hole, one end of the action spring is connected to the hook, and the other end is connected to the fire prevention arm.

[0017] In the above technical solution, the fuse mechanism includes a blocking connector, a fastener and a fuse;

[0018] When the fuse is not blown, the fastener passes through the fuse, the blocking connector and is fixedly connected to the valve body, the blocking connector is fixedly connected to the blocking member to fix the blocking member on the valve body, and the blocking member abuts against the fireproof arm to prevent the fireproof arm from sliding to the bottom end of the guide slot;

[0019] When the fuse blows, the fastener is fixedly connected to the valve body, the connecting piece and the fastener are dislocated to allow the blocking piece to flip around the center of the long rivet to loosen the fireproof arm, and the fireproof arm slides to the bottom end of the guide long hole under the action of the action spring and presses against the valve.

[0020] Compared with the prior art, the beneficial effects of the utility model are: this fire check valve, valve body and valve, the valve is hinged in the valve body through a reset structure and forms a normally closed opening and closing structure that can be opened when the airflow impacts; the end of the reset arm presses against the center of the valve under the action of the reset spring. Since the reset arm presses against the center of the valve, the force center of the valve spreads outward from the center and the force is uniform, so that the valve is not easy to loosen when closed, the airtightness is better, and the effect of preventing the backflow of airflow in the public smoke exhaust duct is better. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 The structure of the utility model is shown in FIG. Figure 1 .

[0022] Figure 2 The structure of the utility model is shown in FIG. Figure 2 .

[0023] Figure 3 The structure of the utility model is shown in FIG. Figure 3 .

[0024] Figure 4 The schematic diagram of the planar structure of the utility model is shown in FIG. Figure 1 .

[0025] Figure 5 The decomposition structure of the utility model is shown in FIG. Figure 1 .

[0026] Figure 6 This is a plan view of the utility model. Figure 1 .

[0027] Figure 7 This is a plan view of the utility model. Figure 2 .

[0028] Figure 8 This is a plan view of the utility model. Figure 3 .

[0029] Fig. 9 The schematic diagram of the planar structure of the utility model is shown in FIG. Figure 2 .

[0030] Fig.10 The schematic diagram of the planar structure of the utility model is shown in FIG. Figure 3 .

[0031] Fig.11 It is an enlarged schematic diagram of point C in the present utility model.

[0032] Fig.12 It is an enlarged schematic diagram of point D in the present utility model.

[0033] Fig.13 It is an enlarged schematic diagram of point A in the utility model.

[0034] Fig.14 It is an enlarged schematic diagram of point B in the utility model. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0036] refer to Figure 1-14 As shown, a fire-proof check valve comprises a valve body 1, a valve 2, a reset structure 3 and a fire-proof mechanism 4, wherein:

[0037] The valve body 1 is made of a high temperature resistant and non-deformable metal material, such as stainless steel. The valve body 1 is provided with a mounting plate 11, which protrudes to one side to form a first valve tube 12, and the first valve tube 12 is radially narrowed to form a first step portion 13, and the first step portion 13 continues to protrude to the same side of the first valve tube 12 to form a second valve tube 14, and the diameter of the second valve tube 14 is smaller than that of the first valve tube 12; the mounting plate 11 protrudes to the other side to form a third valve tube 15, and the third valve tube 15 is radially narrowed to form a second step portion 16, and the second step portion 16 continues to protrude to the same side of the third valve tube 15 to form a fourth valve tube 17, and the diameter of the fourth valve tube 17 is smaller than that of the third valve tube 15; in this embodiment, the mounting plate 11, the first valve tube 12, the first step portion 13, the second valve tube 14, the third valve tube 15, the second step portion 16 and the fourth valve tube 17 are integrally formed, and a piece of metal plate with a hole in the middle is taken, and the first valve tube 12 is processed in sequence by using a punch press. , the first step portion 13, the second valve tube 14, the third valve tube 15, the second step portion 16 and the fourth valve tube 17, the portion that has not been impact processed is the mounting plate 11; the third valve tube 15 and the fourth valve tube 17 with different diameters are provided, so that the fire check valve can adapt to the diameters of different exhaust pipes; the air deflector 1a is made of a high-temperature resistant and non-deformable metal material, such as stainless steel, and is used for airflow guidance. The air deflector 1a is fixed to the mounting plate 11 by welding or by bolts, and the installation direction of the air deflector 1a is located in the direction of the first valve tube 12 and the second valve tube 14, and the air deflector 1a is provided with an adjustable angle flap; long grooves are recessed on both sides of the air deflector 1a, and a guide long hole 111 is opened on the long groove, and the length of the guide long hole 111 is half the length of the long groove; a hook 112 is provided on the long groove of the air deflector 1a located near one end of the mounting plate 11.

[0038] refer to Figure 1-14As shown, the valve 2 is made of a metal material that is resistant to high temperatures and not easily deformed, such as stainless steel. A sealing ring 21 is sleeved on the outer ring of the bottom of the valve 2, and the sealing ring 21 is made of a plastic material that is resistant to high temperatures and not easily deformed.

[0039] refer to Figure 1-14 As shown, the reset structure 3 includes a reset arm 31, a reset spring 32, a hinge seat 33 and a hinge 34, wherein the reset arm 31, the reset spring 32, the hinge seat 33 and the hinge 34 are made of high temperature resistant and non-deformable metal materials, such as stainless steel, wherein the reset spring 32 is treated by a special quenching process to make it elastic; wherein:

[0040] refer to Figure 1-14 As shown, the reset arm 31 includes a reset arm body 312, and a rotating portion 313 for mounting with a long rivet extending from both sides of the rear end of the reset arm body 312 and concavely bent inwardly in the direction of the reset arm body 312. The concave part of the rotating portion 313 and the reset arm body 312 form a movable cavity 314. The rotating portion 313 is provided with a rotating hole 315 that cooperates with the rivet, and the rotating portion 313 is provided with a protrusion 311 for contacting the reset spring 32.

[0041] refer to Figure 1-14 As shown, the reset spring 32 is wound with a 304 stainless steel. The reset spring 32 starts with winding the first locking portion 323, then winding the first torsion coil 321, and then winding the first resistance portion 322. The second resistance portion 322 is subsequently wound out, and then the second torsion coil 321 is wound, and finally the second locking portion 323 is wound; the two torsion coils 321 give the locking portion 323 and the locking portion 323 stronger elastic potential energy.

[0042] refer to Figure 1-14As shown, the hinge seat 33 is formed by stamping and bending a steel plate with a first hinge mounting portion 334 and a second hinge mounting portion 335 on both sides, that is, the first hinge mounting portion 334 is symmetrically provided on both sides of the upper end of the hinge seat 33, and the second hinge mounting portion 335 is symmetrically provided on both sides below the first hinge mounting portion 334. The first hinge mounting portion 334 and the second hinge mounting portion 335 are provided with holes, and a long rivet is passed through the first hinge mounting portion 334, and a short rivet is passed through the second hinge mounting portion 335. The aperture of the hole is larger than the axial diameter of the rivet, and the hole and the rivet clearance are matched; the end of the hinge seat 33 is provided with a first adjustment position 331 and a second adjustment position 332 for adjusting the elastic force of the reset spring 32; the second adjustment position 332 is On the outer side of the first adjustment position 331, the groove depth of the second adjustment position 332 is lower than the groove depth of the first adjustment position 331; the first adjustment position 331 is arranged to be inclined to the second adjustment position 332; the hinge seat 33 is provided with a notch 333 in the middle of the upper end, and the width of the notch 333 is larger than the width between the two rotating parts 313 on the reset arm 31, and the notch 333 effectively avoids the interference between the reset arm 31 and the hinge seat 33 when it moves; an assembly groove 336 for cooperating with the fire protection mechanism 4 is provided below the notch 333; a bolt hole for cooperating with the fastener 442 is provided below the assembly groove 336; bolt holes or through holes for cooperating with the first valve tube 12 of the valve body 1 are also provided on both sides of the bottom of the hinge seat 33.

[0043] refer to Figure 1-14 As shown, the hinge 34 is formed by stamping and bending a piece of metal sheet, and hinge parts 341 are bent on both sides of the hinge 34. The hinge parts 341 on both sides are provided with holes and grooves that match the rivet gaps. An avoidance gap 342 is provided in the middle of the hinge 34. The avoidance gap 342 can be rectangular, square or trapezoidal. The width of the avoidance gap 342 is greater than the width of the blocking member 43. The hinge 34 can avoid the blocking member 43 when rotating.

[0044] refer to Figure 1-14 As shown, the fire prevention mechanism 4 includes a fire prevention arm 41, an action spring 42, a blocking member 43 and a fuse mechanism 44; the fire prevention arm 41 and the blocking member 43 are both made of high temperature resistant and non-deformable metal materials, such as aluminum, iron or stainless steel.

[0045] The fireproof arm 41 is a round rod;

[0046] The action spring 42 is a tension spring;

[0047] The blocking member 43 is formed by stamping and bending a metal sheet. The bottom of the blocking member 43 is bent outward to form a blocking member installation portion 431. The blocking member 43 has two symmetrically bent sides to form blocking member rotating portions 432. The ends of the blocking rotating portions 432 on both sides are bent inward to extend blocking hooks 433. The blocking member rotating portions 432 are provided with holes and grooves that match the rivet gap. The distance between the blocking member rotating portions 432 on both sides of the blocking member 43 is smaller than the distance between the rotating portions 313 on both sides of the reset arm 31.

[0048] The fuse mechanism 44 includes a blocking connector 441, a fastener 442 and a fuse 443. The blocking connector 441 and the fastener 442 are made of metal materials that are resistant to high temperatures and are not easily deformed, such as aluminum, iron or stainless steel. The fuse 443 is a metal workpiece that is easily fusible after being heated, such as a manganese-copper alloy or an alloy containing more than 50% tin.

[0049] The blocking connector 441 is a rectangular metal sheet, and is provided with a mushroom-shaped drop-out groove 4411. The fastener 442 is a bolt or a mushroom nail, etc. The fuse 443 is a round through tube.

[0050] refer to Figure 1-14As shown, when assembled and used, the hinged parts 341 on both sides of the hinged member 34 are respectively sleeved on the second hinged mounting parts 335 on both sides of the hinged seat 33 and fixed by short rivets passing through the hole grooves of the two parts. The hinged part 341 can be turned upside down along the short rivets to make the hinged member 34 turn upside down. The hinged member 34 is fixedly connected to the edge of the valve 2 by bolts or welding technology. The blocking member mounting portion 431 of the blocking member 43 is mounted on the assembly slot 336, and the inner side of the blocking member mounting portion 431 is welded and fixed to the upper end edge of the blocking connecting member 441; the rotating portions 313 on both sides of the reset arm 31 are sleeved on the edges of the blocking member rotating portions 432 on both sides of the blocking member 43, and the hole center of the hole groove of the rotating portion 313 and the hole center of the hole groove of the blocking member rotating portion 432 are located on the same axis, and the inner sides of the two torsion coils 321 of the reset spring 32 are mounted on the outer sides of the rotating portions 313 on both sides of the reset arm 31 and the abutting portion 322 of the reset spring 32 abuts and cooperates with the convex point 311 of the reset spring 32, and the hole center of the torsion coil 321 is aligned with the hole center of the hole groove of the moving portion 313, the hole center of the hole groove of the blocking member rotating portion 432 and the first hinge mounting portion 334 of the hinge seat 33. The centers of the holes are located on the same axis, and the long rivets are passed through the holes of the first hinge mounting portion 334 of the hinge seat 33, the centers of the torsion coil 321, the holes of the rotating portion 313 and the holes of the rotating portion 432 of the blocking member, so that the reset arm 31 and the blocking member 43 are movably connected to the hinge seat 33 around the long rivet as the axis; the locking portion 323 of the reset spring 32 is locked at the first adjustment position 331 or the second adjustment position 332 of the hinge seat 33, and the torsion of the reset spring 32 can be changed by changing the position of the locking portion 323 of the reset spring 32 at the first adjustment position 331 or the second adjustment position 332, thereby changing the reset force of the reset spring 32 on the reset arm 31, and the bottom of the hinge seat 33 is fixed to the outer wall of the first valve tube 12 by bolts installed in the bolt holes or welding. At this time, the reset arm 31 contacts the center of the valve 2 , and the valve 2 is covered on the second valve tube 14 under the action of the reset arm 31 . The sealing ring 21 of the valve 2 is in airtight contact with the first step portion 13 , thereby improving the sealing performance between the valve 2 and the first valve tube 12 .

[0051] This type of fire check valve is installed at the resident end of the public smoke exhaust duct. The mounting plate 11 of the valve body 1 is fixed on the public smoke exhaust duct, and the mounting plate 11 covers the opening of the public smoke exhaust duct. The valve 2 opens to the inside of the public smoke exhaust duct. The guide cover 1a is located in the public smoke exhaust duct and can guide the direction of the airflow in the public smoke exhaust duct, so that the airflow in the public smoke exhaust duct is easy to discharge. The exhaust pipe of exhaust equipment such as range hoods or exhaust fans is set according to the pipe diameter and fixed on the third valve pipe 15 or the fourth valve pipe 17 of the valve body 1.

[0052] The valve 2 is hinged in the valve body 1 through the reset structure 3 and forms a normally closed opening and closing structure that can be opened when the airflow impacts; when the valve 2 is in the closed state, the reset spring 32 presses the valve 2 against the first step 13 between the first valve tube 12 and the second valve tube 14 through the reset arm 31, which can effectively prevent the airflow from the public smoke exhaust duct from flowing back; when there is airflow that needs to be discharged at one end of the room, the airflow pushes the valve 2 from the room to open to the side of the public smoke exhaust duct, and at this time, the airflow can overcome the return force of the reset spring 32; the reset arm body 312 is lifted upward, and the reset arm body 312 is lifted upward so that the convex point 311 of the reset arm body 312 presses the contact part 312 of the reset spring 32 22 is pressed downward to generate a squeezing force; once the air flow in the room is emptied, the valve 2 is no longer subjected to force, and the reset arm 31 is reset downward by the return force of the reset spring 32, and the valve 2 is linked to close and the first step 13 between the first valve tube 12 and the second valve tube 14 to prevent the airflow from the common smoke exhaust duct from flowing back. Since the reset arm body 312 abuts against the center of the valve 2, the force center of the valve 2 spreads outward from the center and the force is evenly applied, so that the valve is not easy to loosen when closed, and the airtightness is better, and the effect of preventing the airflow from the common smoke exhaust duct from flowing back is better. At the same time, since the sealing ring 21 abuts against the first step 13, it can effectively prevent weak gas from flowing into the smoke exhaust duct.

[0053] The two locking parts 323 of the reset spring 32 can realize three different return forces by being locked at different first adjustment positions 331 or second adjustment positions 332. The first type: the two locking parts 323 are respectively locked at the first adjustment position 331 at the same time. The second type: the two locking parts 323 are respectively locked at the second adjustment position 332 at the same time. The third type: any one of the two locking parts 323 is locked at the first adjustment position 331, and the other is locked at the second adjustment position 332. Through these three different return forces, the force of the reset arm body 312 against the valve 2 is also different. The user can adjust the return force of the reset spring 32 as needed, so as to adjust the pressure of the arm body 312 against the valve 2. At the same time, because the locking part 323 is an inverted "L", a barb is formed, so that it will not loosen when it is locked at the first adjustment position 331 or the second adjustment position 332.

[0054] refer to Figure 1-14As shown, when the fuse 443 is not melted, the fireproof arm 41 penetrates into the long guide holes 111 on both sides of the deflector 1a. At the same time, the fireproof arm 41 passes through the concave part of the rotating part 313 and forms a movable cavity 314 with the reset arm body 312, and abuts against the blocking hook 433 of the blocking member 43 and is intercepted by the blocking hook 433; the two ends of the action spring 42 are turned outward, and the ring at one end of the action spring 42 on one side is set on the fireproof arm 41, that is, set on one end of the round rod, and the action spring on the other side is set. The same is true for 42; the ring of the action spring 42 at the other end is connected to the hook 112, the hook 112 passes through the ring and bends into the inner wall of the deflector 1a to fasten; the fastener 442 passes through the fuse 443, the blocking connector 441 and is fixedly connected to the first valve tube 12 of the valve body 1, the blocking connector 441 is fixedly connected to the blocking member 43 to fix the blocking member 43 on the valve body 1, and the blocking hook 433 of the blocking member 43 presses against the fireproof arm 41 to slide to the bottom end of the guide long hole 111.

[0055] refer to Figure 1-14 As shown, when a fire occurs, the flame burns the fuse 443. After the fuse 443 melts, the connecting piece 431 and the fastener 442 are dislocated to allow the blocking piece 43 to flip around the center of the long rivet to loosen the fireproof arm 41. Since the guide long hole 111 is inclined and the inclination direction intersects with the inclination direction of the valve 2, the fireproof arm 41 slides to the bottom end of the guide long hole 111 under the action of the action spring 42 and presses against the valve 2. At this time, the valve 2 will not be able to open, preventing the flame in the public smoke exhaust duct from rushing into the household room, or the flame at one end of the room from rushing into the public smoke exhaust duct.

[0056] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A fire-proof check valve, comprising a valve body (1) and a valve (2), characterized in that: The valve (2) is hinged in the valve body (1) via a reset structure (3) to form a normally closed opening and closing structure that can be opened when impacted by airflow; The reset structure (3) comprises a reset arm (31), a reset spring (32), an articulated seat (33) and an articulated component (34); the articulated seat (33) is fixed on the valve body (1); one end of the articulated component (34) is articulated to the articulated seat (33); the other end of the articulated component (34) is connected to the valve (2); the reset arm (31) is articulated to the articulated seat (33) via a long rivet; the reset spring (32) passes through the long rivet and is disposed against the reset arm (31) and the articulated seat (33); The end of the reset arm (31) presses against the center of the valve (2) under the action of the reset spring (32).

2. A fire-proof check valve according to claim 1, characterized in that: The hinge seat (33) is provided with a first adjustment position (331) and a second adjustment position (332) for adjusting the elastic force of the return spring (32); the second adjustment position (332) is located outside the first adjustment position (331).

3. A fire-proof check valve according to claim 2, characterized in that: The groove depth of the second adjustment position (332) is lower than the groove depth of the first adjustment position (331); and the first adjustment position (331) is arranged to be inclined relative to the second adjustment position (332).

4. A fire-proof check valve according to claim 3, characterized in that: The hinge seat (33) is provided with a notch (333) for avoiding interference caused by the movement of the reset arm (31); the width of the notch (333) is greater than the width of the reset arm (31).

5. A fire-proof check valve according to claim 4, characterized in that: The reset arm (31) is provided with a convex point (311) for contacting the reset spring (32).

6. A fire-proof check valve according to claim 5, characterized in that: The return spring (32) is wound with two torsion coils (321), a contact portion (322) that contacts and cooperates with the protrusion (311) is provided between the two torsion coils (321), and a locking portion (323) is extended from the outer ends of the two torsion coils (321), and the locking portion (323) is locked on the first adjustment position (331) or the second adjustment position (332).

7. A fire-proof check valve according to claim 6, characterized in that: It also includes a fire protection mechanism (4), which is installed between the valve body (1) and the hinge seat (33).

8. A fire-proof check valve according to claim 7, characterized in that: The valve body (1) is provided with a flow guide cover (1a), the flow guide cover (1a) is provided with a long guide hole (111), and the long guide hole (111) is arranged at an angle, and the inclination direction intersects with the inclination direction of the valve (2).

9. A fire-proof check valve according to claim 8, characterized in that: The fire prevention mechanism (4) includes a fire prevention arm (41), an action spring (42), a blocking member (43) and a fuse mechanism (44); the fuse mechanism (44) is installed on the hinge seat (33), the blocking member (43) is connected to the fuse mechanism (44) and a long rivet is passed through the blocking member (43) so that the blocking member (43) is installed on the hinge seat (33), a hook (112) is provided on the valve body (1), the fire prevention arm (41) is inserted into the guide long hole (111) and can slide along the guide long hole (111), one end of the action spring (42) is connected to the hook (112), and the other end is connected to the fire prevention arm (41).

10. A fire-proof check valve according to claim 9, characterized in that: The fuse mechanism (44) comprises a blocking connection member (441), a fastener (442) and a fuse member (443); When the fuse (443) is not blown, the fastener (442) passes through the fuse (443), the blocking connection member (441) is fixedly connected to the valve body (1), the blocking connection member (441) is fixedly connected to the blocking member (43) to fix the blocking member (43) on the valve body (1), and the blocking member (43) abuts against the fire prevention arm (41) to prevent the fire prevention arm (41) from sliding down to the bottom end of the guide slot (111); When the fuse (443) is blown, the fastener (442) is fixedly connected to the valve body (1), and the connecting member (431) and the fastener (442) are dislocated to allow the blocking member (43) to flip around the center of the long rivet to loosen the fireproof arm (41). Under the action of the action spring (42), the fireproof arm (41) slides to the bottom end of the guide long hole (111) and presses against the valve (2).

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