阅读说明：本技术 防火止回阀 (Fireproof check valve ) 是由 王启定 曹正祥 于 2020-05-17 设计创作，主要内容包括：本发明涉及一种防火止回阀,以解决阀片处于高温环境下存在一定概率无法接收到来自拨动机构的推力的问题。防火止回阀包括阀体和阀片,所述阀体上设有排气口,所述阀片打开或者关闭所述排气口,所述限位机构、所述卡钩机构和所述拨动机构分别可活动地设于所述阀体上,所述感温机构设于所述限位机构上,所述限位机构具有锁紧位置和解锁位置,当所述感温机构工作以使所述限位机构处于锁紧位置时,所述限位机构限定所述卡钩机构的位置,以保持所述卡钩机构钩住所述拨动机构；当所述感温机构停止工作以使所述限位机构处于解锁位置时,所述卡钩机构与所述拨动机构分离,所述拨动机构通过所述阀片的外壁关闭所述排气口。(The invention relates to a fireproof check valve, which aims to solve the problem that a valve plate cannot receive thrust from a toggle mechanism at a certain probability in a high-temperature environment. The fire-proof check valve comprises a valve body and a valve plate, wherein an exhaust port is formed in the valve body, the valve plate opens or closes the exhaust port, the limiting mechanism, the clamping hook mechanism and the shifting mechanism are respectively and movably arranged on the valve body, the temperature sensing mechanism is arranged on the limiting mechanism, the limiting mechanism is provided with a locking position and an unlocking position, and when the temperature sensing mechanism works to enable the limiting mechanism to be located at the locking position, the limiting mechanism limits the position of the clamping hook mechanism so as to keep the clamping hook mechanism to hook the shifting mechanism; when the temperature sensing mechanism stops working so that the limiting mechanism is located at the unlocking position, the hook mechanism is separated from the toggle mechanism, and the toggle mechanism closes the exhaust port through the outer wall of the valve plate.)

1. Fire prevention check valve, including valve body, valve block and driving lever, the valve block with the driving lever respectively with the valve body rotates to be connected, the valve block with the valve body rotates the junction and forms first axle center, the driving lever with the articulated department of valve body forms the second axle center, first axle center with second axle center nonparallel, be equipped with the gas vent on the valve body, the driving lever promotes the valve block is closed the gas vent, its characterized in that, fire prevention check valve still includes:

the locking structure is arranged on the valve body, the deflector rod abuts against the locking structure when the locking structure works, and the deflector rod rotates around the valve body and pushes the valve plate to rotate around the valve body when the locking structure stops working, so that the valve plate closes the exhaust port;

the clamping structure is fixedly connected with the valve body, and when the valve plate closes the exhaust port, the shifting rod is clamped between the clamping structure and the valve plate to prevent the valve plate from opening the exhaust port.

2. The fire resistant check valve of claim 1, wherein the valve body and/or the latching structure are provided with a guide surface, a projection of the guide surface on a horizontal plane is at an angle to a projection of the lever on a horizontal plane, the latching structure is provided with an abutment surface, and the lever slides to the abutment surface via the guide surface and applies a force to the abutment surface.

3. The fire resistant check valve of claim 1, wherein when the valve plate closes the vent and the lever is clamped between the catch and the valve plate, a top of the lever abuts an inner wall of the valve body.

4. The fire resistant check valve of claim 3, wherein said deflector tip comprises a beveled surface, and/or said deflector tip comprises a curved surface.

5. The fire-resistant check valve of claim 1, wherein the locking structure comprises a locking plate, a locking rod, a temperature sensing mechanism and a mounting seat, the mounting seat is arranged on the inner wall of the valve body, the locking rod is arranged on the mounting seat, the temperature sensing mechanism is arranged on the locking rod and used for preventing the locking rod from moving axially, the locking plate is rotatably connected with the valve body, when the temperature sensing mechanism works, one end of one side of the locking plate abuts against the shift lever, and one end of the other side of the locking plate is connected with the locking rod; when the temperature sensing mechanism stops working, the locking rod is separated from the locking plate, and the shifting rod pushes the locking plate to be opposite to the valve body, and then the locking plate is abutted to the valve block after rotating, so that the valve block is pushed to rotate around the valve body.

6. The fire protection check valve of claim 5, wherein the locking plate includes a locking portion and a limiting portion connected to the locking portion, the locking portion is rotatably connected to the valve body, the locking portion is provided with a protrusion, when the temperature sensing mechanism operates, the protrusion abuts against the shift lever, the limiting portion is connected to the locking lever, and the protrusion and the limiting portion are located on both sides of the first axis.

7. The fire resistant check valve of claim 6, wherein said projection includes a lower abutment surface that can abut a deflector rod and an upper abutment surface that can abut where said deflector rod is hinged to said valve body, said lower abutment surface being located below said upper abutment surface.

8. The fire resistant check valve of claim 6 wherein said retainer portion terminates in a bend that abuts an inner wall of said valve body after said toggle lever urges said locking plate to rotate relative to said valve body and said toggle lever is disengaged from said boss.

9. The fire resistant check valve of claim 5, wherein the locking structure further comprises an elastic member and a stop plate, the stop plate is disposed on the mounting seat, the elastic member is sandwiched between the locking rod and the stop plate, and when the temperature sensing mechanism stops operating, the elastic member pushes the locking rod to move axially so as to separate the locking rod from the locking plate.

10. The fire-resistant check valve according to claim 1, wherein a placement groove is provided on the valve body, the shift lever is inserted into the placement groove when the temperature sensing mechanism is operated, the locking structure and the valve body define a locking groove, the shift lever is inserted into the locking groove when the temperature sensing mechanism is stopped, and a projection of the locking groove on a horizontal plane at least partially coincides with a projection of the placement groove on the horizontal plane.

Technical Field

The invention relates to a fireproof check valve.

Background

The exhaust duct is installed in buildings such as houses, office buildings, hotels and the like, the fireproof check valve is installed on the exhaust duct and plays a similar role of opening and closing, namely, oil smoke exhausted by the indoor range hood is exhausted into the exhaust duct located outdoors through the fireproof check valve.

The existing fireproof check valve comprises a valve body, a valve plate and a deflector rod, wherein the valve body is provided with an exhaust port, the fireproof check valve is communicated with a gas flow path between the indoor space and the outdoor space through the exhaust port, the valve plate is rotatably connected with the valve body to open or close the exhaust port, and when the fireproof check valve is in a normal-temperature environment, the valve plate rotates relative to the valve body to close the exhaust port so as to isolate the gas flow path between the indoor space and the outdoor space; when the fire prevention check valve is in high temperature environment, the plectrum promotes the valve plate and closes the gas vent to realize that the fire prevention check valve isolates the gas circulation route between indoor and outdoor. However, the existing valve plate has a problem that the existing valve plate cannot receive the thrust from the deflector rod under the high-temperature environment with a certain probability, so that the fire-proof check valve under the high-temperature environment has the problem of gas flow path isolation failure.

Disclosure of Invention

The invention aims to provide a fireproof check valve to solve the problem of gas flow path isolation failure of the fireproof check valve in a high-temperature environment.

In order to solve the above problems, the present invention provides the following technical solutions:

the fire prevention check valve includes valve body, valve block and driving lever, the valve block with the driving lever respectively with the valve body rotates to be connected, the valve block with the valve body rotates the junction and forms first axle center, the driving lever with the articulated department of valve body forms the second axle center, first axle center with second axle center nonparallel, be equipped with the gas vent on the valve body, the driving lever promotes the valve block is closed the gas vent, the fire prevention check valve still includes:

the locking structure is arranged on the valve body, the deflector rod abuts against the locking structure when the locking structure works, and the deflector rod rotates around the valve body and pushes the valve plate to rotate around the valve body when the locking structure stops working, so that the valve plate closes the exhaust port;

the clamping structure is fixedly connected with the valve body, and when the valve plate closes the exhaust port, the shifting rod is clamped between the clamping structure and the valve plate to prevent the valve plate from opening the exhaust port.

According to the invention, the fireproof check valve comprises a locking structure, and when the locking structure works, the deflector rod abuts against the locking structure. So design, when the fire prevention check valve was in normal atmospheric temperature environment, locking structure can effectively avoid the driving lever to interfere the valve block and open or close the gas vent.

When the locking structure stops working, the deflector rod rotates around the valve body and pushes the valve plate to rotate around the valve body, so that the valve plate closes the exhaust port. So design, when the fire prevention check valve was in high temperature environment, the driving lever will provide the thrust of a closed gas vent for the valve block to avoid the valve block can't close the gas vent.

According to the invention, the fireproof check valve further comprises a clamping structure, the clamping structure is fixedly connected with the valve body, and the clamping structure is fixedly connected with the valve body, so that when the shifting lever is clamped between the clamping structure and the valve plate, the shifting lever is prevented by the clamping structure from moving towards an exhaust direction far away from the exhaust port (in the invention, the exhaust port is circular, and therefore, the exhaust direction of the exhaust port refers to the central axis direction of the exhaust port).

In addition, when the valve plate closes the exhaust port, the valve body prevents the deflector rod from continuously pushing the valve plate to move towards the exhaust port.

When the gas vent is closed to the valve block to the driving lever centre gripping when blocking between structure and valve block, synthesize "the structure of blocking prevents the driving lever and moves towards the exhaust direction of keeping away from the gas vent" and "the valve body prevents the driving lever to continue to push the valve block and move towards the gas vent direction" these two technical characterstic are difficult to be derived: the position of the deflector rod in the exhaust direction of the exhaust port is fixed. When the position of the deflector rod in the exhaust direction of the exhaust port is fixed, the position of the valve plate in the exhaust direction of the exhaust port is fixed. By the design, the fireproof check valve in a high-temperature environment cannot generate the condition of gas flow path isolation failure.

Furthermore, the valve body and/or the clamping structure are/is provided with guide surfaces, the projection of the guide surfaces on the horizontal plane and the projection of the deflector rod on the horizontal plane form a certain angle, the clamping structure is provided with abutting surfaces, and the deflector rod slides to the abutting surfaces through the guide surfaces and applies acting force to the abutting surfaces. With this arrangement, the guide surface serves to reduce the difficulty of the shift lever sliding into the abutment surface, which serves to define the position of the shift lever in the axial direction of the second axial center.

Further, when the valve plate closes the exhaust port and the shifting lever is clamped between the clamping structure and the valve plate, the top of the shifting lever abuts against the inner wall of the valve body. By the design, the driving lever is prevented from rotating around the second axis, so that the driving lever is prevented from being staggered with the clamping structure when the valve plate closes the exhaust port.

Further, the top of the deflector rod comprises an inclined surface, and/or the top of the deflector rod comprises an arc surface. By the design, the size precision requirement of the deflector rod is reduced, and the acting force of the deflector rod for extruding the inner wall of the valve body is improved, especially under the driving of the torsion spring.

Furthermore, the locking structure comprises a locking plate, a locking rod, a temperature sensing mechanism and a mounting seat, the mounting seat is arranged on the inner wall of the valve body, the locking rod is arranged on the mounting seat, the temperature sensing mechanism is arranged on the locking rod and used for preventing the locking rod from axially moving, the locking plate is rotatably connected with the valve body, when the temperature sensing mechanism works, one end of one side of the locking plate is abutted against the deflector rod, and one end of the other side of the locking plate is connected with the locking rod; when the temperature sensing mechanism stops working, the locking rod is separated from the locking plate, and the shifting rod pushes the locking plate to be opposite to the valve body, and then the locking plate is abutted to the valve block after rotating, so that the valve block is pushed to rotate around the valve body. So design, temperature sensing mechanism is used for injecing the position of the relative locking plate of locking pole to realize locking pole butt locking plate or with the separation of locking plate.

Furthermore, the lock plate includes lock part and with spacing portion that lock part is connected, lock part with the valve body rotates to be connected, be equipped with the arch in the lock part, work as the temperature sensing mechanism during operation, protruding butt the driving lever, spacing portion connects the lock pole, protruding with spacing portion is located the both sides of primary shaft center. When protruding and spacing portion were located the both sides of first axle center, the high position of spacing portion can be through reducing to the lock plate to the realization is raised bellied high position.

Furthermore, the protrusion comprises a lower abutting surface capable of abutting against a shifting rod and an upper abutting surface capable of abutting against the hinged position of the shifting rod and the valve body, and the lower abutting surface is located below the upper abutting surface. By the design, the rotation angle of the locking plate relative to the valve body is limited by the hinged position of the deflector rod and the valve body (the hinged position of the deflector rod and the valve body is a first rotating shaft), so that the installation difficulty of the locking plate is reduced.

Furthermore, the tail end of the limiting part is provided with a bend, the driving lever pushes the locking plate to rotate relative to the valve body, and the bend can be abutted to the inner wall of the valve body after the driving lever is separated from the bulge. So design, first pivot with bend the turned angle of the relative valve body of locking plate in two directions to the realization further reduces the installation degree of difficulty of locking plate.

Furthermore, the locking structure further comprises an elastic element and a stop plate, the stop plate is arranged on the mounting seat, the elastic element is clamped between the locking rod and the stop plate, and when the temperature sensing mechanism stops working, the elastic element pushes the locking rod to move axially, so that the locking rod is separated from the locking plate. According to the design, the elastic element provides thrust for the locking rod so as to realize the automatic separation of the locking rod and the locking plate.

Furthermore, a placing groove is formed in the valve body, the shifting rod is inserted into the placing groove when the temperature sensing mechanism works, a clamping groove is defined by the clamping structure and the valve body, the shifting rod is inserted into the clamping groove when the temperature sensing mechanism stops working, and at least part of the projection of the clamping groove on the horizontal plane is overlapped with the projection of the placing groove on the horizontal plane. So design, the standing groove is used for injecing the mounted position of driving lever when locking structure stop work to avoid the unable normal work of fire prevention check valve that driving lever and locking plate separation caused.

Drawings

FIG. 1 is a first perspective view of a fire check valve in accordance with a preferred embodiment of the present invention;

FIG. 2 is a second perspective view of the fire check valve in the preferred embodiment of the present invention;

FIG. 3 is a rear view of the fire check valve in the preferred embodiment of the present invention;

FIG. 4 is a cross-sectional view taken at A-A of FIG. 3;

FIG. 5 is a cross-sectional view taken at B-B of FIG. 3;

FIG. 6 is a cross-sectional view taken at C-C of FIG. 3;

FIG. 7 is a front view of a fire check valve in accordance with a preferred embodiment of the present invention;

FIG. 8 is a cross-sectional view taken at D-D of FIG. 7;

FIG. 9 is a perspective view of a latch plate in accordance with a preferred embodiment of the present invention;

FIG. 10 is a perspective view of a valve body in a preferred embodiment of the invention;

fig. 11 is a third perspective view of the fire check valve in the preferred embodiment of the present invention.

Detailed Description

The technical solutions of the embodiments of the present invention are explained and illustrated below with reference to the drawings of the embodiments of the present invention, but the following embodiments are only preferred embodiments of the present invention, and not all embodiments. Based on the embodiments in the implementation, other embodiments obtained by those skilled in the art without any creative effort belong to the protection scope of the present invention.

Referring to fig. 3, 4 and 5, the fire-proof check valve includes a valve body 1, a valve sheet 2 and a shift lever 3, the valve sheet 2 and the shift lever 3 are respectively rotatably connected with the valve body 1, a first axis Q1 is formed at the rotary connection position of the valve sheet 2 and the valve body 1, a second axis Q2 is formed at the hinged position of the shift lever 3 and the valve body 1, the first axis Q1 is not parallel to the second axis Q2, as can be seen from fig. 6, an exhaust port 111 is arranged on the valve body 1, and the shift lever 3 pushes the valve sheet 1 to close the exhaust port 111.

In this embodiment, the valve plate 2 is rotatably connected to the valve body 1 through a first rotating shaft 10, the shift lever 3 is rotatably connected to the valve body 1 through a second rotating shaft 20, wherein the first rotating shaft 10 is movably inserted into the valve plate 2 and the valve body 1, and the second rotating shaft 20 is movably inserted into the shift lever 3 and the valve body 1. In other embodiments of the invention, the first rotating shaft can be movably inserted into one of the valve plate and the valve body, and the other of the valve plate and the valve body is fixedly connected with the first rotating shaft; the second rotating shaft can be movably inserted into one of the shifting lever and the valve body, and the other of the shifting lever and the valve body is fixedly connected with the second rotating shaft.

Referring to fig. 2, 7 and 8, the difference from the prior art is that the fire check valve of the present embodiment further includes:

the locking structure 4 is arranged on the valve body 1, when the locking structure 4 works, the driving lever 3 abuts against the locking structure 4, when the locking structure 4 stops working, the driving lever 3 rotates around the valve body 1 and pushes the valve plate 2 to rotate around the valve body 1, so that the valve plate 2 closes the exhaust port 111;

the clamping structure 5 is fixedly connected with the valve body 1, and when the valve plate 2 closes the exhaust port 111, the shift lever 3 is clamped between the clamping structure 5 and the valve plate 2 to prevent the valve plate 2 from opening the exhaust port 111.

In this embodiment, when the locking plate 45 abuts against the shift lever 3, the locking structure 4 works; when the locking plate 45 is separated from the shift lever 3, the locking structure 4 stops working.

Referring to fig. 6, the locking structure 5 is provided with a guide surface 52, a projection of the guide surface 52 on a horizontal plane is at an angle with a projection of the shift lever 3 on the horizontal plane, referring to fig. 8, the locking structure 5 is provided with an abutting surface 51, and the shift lever 3 slides to the abutting surface 51 through the guide surface 52 and applies a force to the abutting surface 51. In other embodiments of the invention, the valve body is provided with a guide surface; alternatively, the valve body and the locking structure are both provided with guide surfaces.

Preferably, the guide surface 52 is in engagement with the abutment surface 51, and the guide surface 52 is flush with the abutment surface 51. In other embodiments of the invention, the guide surface may be inclined at a different angle to the abutment surface; alternatively, a gap exists between the guide surface and the abutment surface, and the size of the gap is smaller than the width of the lever.

As shown in fig. 7 and 8, when the valve plate 2 closes the exhaust port 111 and the lever 3 is clamped between the locking structure 5 and the valve plate 2, the top of the lever 3 abuts against the inner wall of the valve body 1.

In this embodiment, the top of toggle lever 3 includes an inclined surface, and/or the top of toggle lever 3 includes an arcuate surface.

Referring to fig. 3, 7 and 8, the locking structure 4 includes a locking plate 45, a locking rod 41, a temperature sensing mechanism 44 and a mounting seat 46, the mounting seat 46 is disposed on the inner wall of the valve body 1, the locking rod 41 is disposed on the mounting seat 46, the temperature sensing mechanism 44 is disposed on the locking rod 41 and is used for preventing the locking rod 41 from moving axially, the locking plate 45 is rotatably connected with the valve body 1, when the temperature sensing mechanism 44 works, one end of one side of the locking plate 45 abuts against the shift lever 3, and one end of the other side of the locking plate 45 is connected with the locking rod 41; when the temperature sensing mechanism 44 stops working, the locking rod 41 is separated from the locking plate 45, and the shift lever 3 pushes the locking plate 3 to rotate relative to the valve body 1 and then abut against the valve plate 2, so as to push the valve plate 2 to rotate around the valve body 1.

It should be noted that: the temperature sensing mechanism 44 is a fusing ring which is sleeved on the locking rod 41, and when the fusing ring is not fused, the temperature sensing mechanism 44 works; when the fusing ring is melted, the temperature sensing mechanism 44 stops operating. The fuse ring is made of a fusible solder including, but not limited to, one or more of sapphire, indium, tin, cadmium, zinc, and lead. In other embodiments of the present invention, the temperature sensing mechanism is a fuse block, the fuse block is made of fusible solder, and the fuse block can be welded on the locking rod or clamped between the stop plate and the mounting seat; or the temperature sensing mechanism is made of memory metal, and the memory metal is clamped between the stop plate and the mounting seat.

In this embodiment, the fusing ring is preferably in an interference fit with the locking rod 41, so as to prevent the fusing ring from sliding axially relative to the locking rod 41. Preferably, the fuse ring is sandwiched between the stop plate 43 and the mounting seat 46, and is designed to further prevent the fuse ring from sliding axially relative to the lock rod 41.

Referring to fig. 9, the lock plate 45 includes a lock portion 4502 and a limit portion 4501 connected to the lock portion 4502, the lock portion 4502 is rotatably connected to the valve body 1, a protrusion 451 is provided on the lock portion 4502, when the temperature sensing mechanism 44 operates, the protrusion 451 abuts against the shift lever 3, the limit portion 4501 is connected to the lock lever 41, and the protrusion 451 and the limit portion 4501 are located on both sides of the first axis Q1.

As can be seen from fig. 8 and fig. 9, the locking portion 4502 is provided with a first mounting hole 452 disposed horizontally, and the third rotating shaft 50 penetrates through the first mounting hole 452 and is inserted into the valve body 1, so as to realize the rotational connection between the locking portion 4501 and the valve body 1; the limit portion 4501 is provided with a second mounting hole 453 that is vertically provided, and the lower end of the lock lever 41 is inserted into the second mounting hole 453.

Referring to fig. 9, the protrusion 451 includes a lower abutting surface 4511 capable of abutting against the shift lever 3 and an upper abutting surface 4512 capable of abutting against a hinge joint of the shift lever 3 and the valve body 1, where the hinge joint of the shift lever 3 and the valve body 1 is the first rotating shaft 10, and the lower abutting surface 4511 is located below the upper abutting surface 4512.

Preferably, the lower abutting surface 4511 is recessed inwards, and the lower abutting surface 4511 is recessed inwards to increase the contact area between the lower abutting surface 4511 and the shift lever 3 and limit the shift lever 3; the upper abutment surface 4512 protrudes outward, and the upper abutment surface 4512 protrudes outward to reduce the contact area between the upper abutment surface 4512 and the first rotating shaft 10 and reduce the probability of interference of the protrusion 451 with the first rotating shaft 10.

Referring to fig. 9, the end of the limiting portion 4501 is provided with a bend 4503, and after the shift lever 3 pushes the locking plate 45 to rotate relative to the valve body 1 and the shift lever 3 is separated from the protrusion 451, the bend 4503 can abut against the inner wall of the valve body 1.

In this embodiment, the bend 4503 abuts against the inner wall of the valve body 1 through the lower wall 454 thereof.

Referring to fig. 8, the locking structure 4 further includes an elastic element 42 and a stop plate 43, the stop plate 43 is disposed on the mounting seat 46, the elastic element 42 is clamped between the locking rod 41 and the stop plate 43, and when the temperature sensing mechanism 44 stops working, the elastic element 42 pushes the locking rod 41 to move axially, so that the locking rod 41 is separated from the locking plate 45. In other embodiments of the present invention, when the temperature sensing mechanism stops working, the locking rod can also be separated from the locking plate under the action of its own gravity.

Referring to fig. 8, a placing groove 121 is arranged on the valve body 1, when the temperature sensing mechanism 44 works, the shift lever 3 is inserted into the placing groove 121, the clamping structure 5 and the valve body 11 form a clamping groove in a surrounding manner, when the temperature sensing mechanism 44 stops working, the shift lever 3 is inserted into the clamping groove, and at least part of the projection of the clamping groove on the horizontal plane coincides with the projection of the placing groove 121 on the horizontal plane.

In this embodiment, the valve body 1 includes a body 11 and a first placing seat 12, the placing groove 121 is provided on the first placing seat 12, and the first placing seat 12 is detachably provided on the body 11. By the design, the first placing seats 12 with different specifications are convenient to replace, so that the shifting rods 3 with different specifications can be matched.

In this embodiment, the valve body 1 further includes a second placing seat 13, the shift lever 3 and the second placing seat 13 are rotatably connected through a second rotating shaft 20, and the valve plate 2 and the first placing seat 12 are rotatably connected through a first rotating shaft 10.

Preferably, the first rotating shaft 10 is sleeved with a first torsion spring, and the second rotating shaft 20 is sleeved with a second torsion spring.

Referring to fig. 6, the valve sheet 2 includes a valve sheet body 21 and a connecting plate 22, the valve sheet body 21 is detachably disposed on the connecting plate 22, and the connecting plate 22 is rotatably connected to the valve body 1 through the first rotating shaft 10. By the design, the manufacturing difficulty of the valve plate body 21 is reduced, the integrity of the valve plate body 21 is improved, and the valve plate body 21 is formed by punching a metal plate.

While the present invention has been described with reference to the preferred embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. Any modification which does not depart from the functional and structural principles of the present invention is intended to be included within the scope of the claims.