CN115059784A

CN115059784A - Check valve

Info

Publication number: CN115059784A
Application number: CN202210547972.7A
Authority: CN
Inventors: 任富佳; 胡荣伟; 吕春明; 胡娇; 郁明跃; 余国成
Original assignee: Hangzhou Robam Appliances Co Ltd
Current assignee: Hangzhou Robam Appliances Co Ltd
Priority date: 2022-05-18
Filing date: 2022-05-18
Publication date: 2022-09-16

Abstract

The invention provides a check valve, which relates to the technical field of kitchen appliances, and comprises: the fire-proof assembly comprises a stopping structure, and the stopping structure is used for swinging to the rear side of the non-return assembly after being unlocked and abutting the non-return assembly on the air outlet; the support is arranged on the valve body, the stopping structure comprises a stopping part and swing arms positioned at two ends of the stopping part, each swing arm is connected with a rotating shaft, and the rotating shafts are rotatably connected with the support; the backstop assembly is provided with a hinge hole and is rotationally connected with the rotating shaft through the hinge hole.

Description

Check valve

Technical Field

The invention relates to the technical field of kitchen appliances, in particular to a check valve.

Background

The fire-proof check valve comprises a valve body, a valve plate and a fire-proof stop lever, wherein the valve plate is connected to the valve body through a hinged shaft, the fire-proof stop lever is connected to the valve body through a rotating shaft, the fire-proof stop lever is started when a fire breaks out, the fire-proof stop lever can be released and pressed on the valve plate, and therefore the valve plate is pressed on the valve body, and flame is blocked.

However, the existing fireproof check valve has the disadvantages of complex structure, high preparation cost and large volume.

Disclosure of Invention

The invention aims to provide a check valve to solve the technical problem that the structure of the existing fireproof check valve is complex.

The embodiment of the invention provides a check valve, which comprises: the fire-proof assembly comprises a stopping structure, and the stopping structure is used for swinging to the rear side of the non-return assembly after being unlocked and abutting the non-return assembly on the air outlet;

the support is arranged on the valve body, the stopping structure comprises a stopping part and swing arms positioned at two ends of the stopping part, each swing arm is connected with a rotating shaft, and the rotating shafts are rotatably connected with the support;

the backstop assembly is provided with a hinge hole and is rotationally connected with the rotating shaft through the hinge hole.

Furthermore, one end of the rotating shaft is connected with the swing arms, the other end of the rotating shaft is located in an area between the two swing arms, and the support is located between the two swing arms.

Furthermore, the support includes two first assembly portions that the interval set up, and two first assembly portions rotate with two pivots respectively and are connected.

Furthermore, the non-return assembly is provided with two lug plates which are arranged at intervals, each lug plate is provided with a hinge hole, and the two lug plates are positioned between the two first assembling parts;

just be connected with joint spare in the pivot, the otic placode is located between first assembly portion and the joint spare, joint spare is used for preventing otic placode, curb plate and pivot separation.

Furthermore, an annular clamping groove is formed in the rotating shaft, and the clamping piece is a C-shaped spring.

Furthermore, the fireproof assembly comprises a temperature-sensitive locking structure and an elastic resetting structure, wherein the temperature-sensitive locking structure is used for locking the stop structure at a normal temperature state and unlocking the stop structure when the ambient temperature is higher than a preset temperature; the elastic reset structure is connected between the valve body and the stop structure, and the elastic reset structure is used for driving the stop structure to press on the rear side face of the check assembly when the temperature-sensitive locking structure is unlocked.

Further, the elastic reset structure comprises a locking torsion spring, the locking torsion spring is installed in a region where the rotating shaft is located between the first assembling portion and the swing arm, one fixed end of the locking torsion spring is connected with the support, and the other fixed end of the locking torsion spring is connected with the stopping portion.

Furthermore, a flanging punched outwards is arranged on the first assembling portion, and one fixed end of the locking torsion spring is abutted to the flanging.

Further, the temperature-sensitive locking structure comprises a first part and a second part, the first part is connected with the valve body, the second part is connected with the first part through a hot melting material, and the second part is used for pressing the stopping structure on the valve body.

Furthermore, a non-return torsion spring is arranged on the support, the fixed end of the non-return torsion spring is connected with the support, and the free end of the non-return torsion spring is abutted against the rear side face of the non-return assembly.

Furthermore, the support is provided with a second assembly part, the second assembly part is located between the two first assembly parts, and the non-return torsion spring is connected with the second assembly part.

Furthermore, the non-return torsion spring comprises two fixed end parts and a U-shaped free end part, and two sides of an opening of the free end part are respectively connected with the two fixed end parts;

the second assembling parts comprise two parts which are arranged at intervals, and two fixed end parts of the non-return torsion spring are respectively fixed on the two second assembling parts.

Further, the valve body comprises an outer shell and an inner shell, and the inner shell is positioned inside the outer shell;

the outer shell is provided with a first opening forming an exhaust passage, and the inner shell is provided with a second opening forming the exhaust passage; from the front to the back, the first opening and the second opening are arranged in sequence.

Further, from the front to the back, the orientation of the air outlet of the second opening is inclined upwards.

Further, an outer side panel is arranged on the inner shell, an inclined circular truncated cone protruding towards the rear side is arranged on the outer side panel, the top surface of the inclined circular truncated cone inclines towards the upper side from front to rear, and the second opening is formed in the top surface of the inclined circular truncated cone.

The check valve provided by the embodiment of the invention comprises: the fire-proof assembly comprises a stopping structure, and the stopping structure is used for swinging to the rear side of the non-return assembly after being unlocked and abutting the non-return assembly on the air outlet; the support is arranged on the valve body, the stopping structure comprises a stopping part and swing arms positioned at two ends of the stopping part, each swing arm is connected with a rotating shaft, and the rotating shafts are rotatably connected with the support; the backstop assembly is provided with a hinge hole and is rotationally connected with the rotating shaft through the hinge hole. In this embodiment, a separate hinge shaft may not be provided to the check assembly, and the check assembly is hinged to the rotation shaft of the stopper structure. When the stopping structure swings, the position of a rotating shaft on the stopping structure relative to the valve body is unchanged, and the non-return assembly can rotate around the rotating shaft to open and close the exhaust passage. The valve body is respectively connected with the stop structure and the non-return component through the bracket, and the non-return component is not additionally provided with the hinge shaft, so that the structure of the product is simpler, and the manufacturing cost is lower.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

FIG. 1 is an exploded view of a fire check valve according to an embodiment of the present invention;

FIG. 2 is a schematic view of a fire protection assembly of the fire protection check valve provided in an embodiment of the present invention;

FIG. 3 is a schematic view of a stop structure of the fire check valve according to an embodiment of the present invention;

FIG. 4 is a schematic view of a bracket for a fire check valve provided in accordance with an embodiment of the present invention;

FIG. 5 is a schematic view of the check plate of the fire check valve according to the embodiment of the present invention after being opened;

FIG. 6 is a schematic view of a check plate of the fire check valve according to an embodiment of the present invention after closing;

FIG. 7 is an angle view of the inner housing of the fire check valve according to the present invention;

fig. 8 is a schematic view of a temperature-sensitive locking structure of a fire check valve according to an embodiment of the present invention;

FIG. 9 is a schematic view of a stop torsion spring of the fire check valve according to an embodiment of the present invention;

FIG. 10 is a schematic view of another angle of the inner housing of the fire check valve according to the present invention;

FIG. 11 is a schematic view of an outer housing of a fire check valve provided in accordance with an embodiment of the present invention;

FIG. 12 is a side view of a fire check valve provided in accordance with an embodiment of the present invention;

FIG. 13 is an enlarged view of a portion of FIG. 12 at position A;

FIG. 14 is a cross-sectional view of a gap between an inner housing and an outer housing of a fire check valve according to an embodiment of the present invention.

Icon: 110-a housing; 130-inner side panel; 121-a mounting section; 111-a flange; 1111-folding edges; 140-a first peripheral edge;

200-an inner shell; 210-an outer side panel; 211-an oblique truncated cone; 212-annular outer rim; 222-a limit jack; 220-a second peripheral edge;

310-backstop sheet; 320-a support frame; 360-non-return torsion spring; 361-fixed end; 362-free end;

410-a stop structure; 412-swing arm; 413-a rotating shaft; 4131-ring groove; 440-locking torsion spring;

510-pre-tightening a torsion spring;

600-a temperature sensitive locking structure; 610-a first portion; 611-limiting plug-in; 620-second portion; 621-a second receiving hole;

700-a bracket; 710-flanging; 720-a first mounting portion; 731-a first plate; 732-a second plate; 7321-first mounting hole; 740-a back plate.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in fig. 1 to 8, an embodiment of the present invention provides a check valve including: the check valve comprises a valve body, a bracket 700, a check assembly and a fire prevention assembly, wherein the check assembly is used for opening and closing an air outlet of the valve body, and the fire prevention assembly comprises a stop structure 410. The stopping structure 410 can swing, and when the stopping structure is locked by the temperature control locking structure, the stopping structure 410 does not influence the movement of the backstop assembly; when the stopping structure 410 is unlocked, the stopping structure 410 swings to the rear side of the backstop assembly and abuts the backstop assembly against the air outlet.

As shown in fig. 2, the bracket 700 is disposed on the valve body, and the bracket and the valve body may be coupled by a screw. The stopping structure 410 includes a stopping portion contacting with the backstop assembly, and a swing arm 412 located at both ends of the stopping portion. Every swing arm 412 is last all to be connected with pivot 413, pivot 413 with support 700 rotates and is connected, wherein, the backstop portion can be for the calathiform, and the backstop portion can be 90 with the contained angle of swing arm 412, and the contained angle of swing arm 412 and pivot 413 can be 90 degrees. The backstop component is provided with a hinge hole, and the backstop component is rotationally connected with the rotating shaft 413 through the hinge hole. In this embodiment, a separate hinge shaft may not be provided to the check assembly, and the check assembly is hinged to the rotation shaft 413 of the stopper 410. When the stopping structure 410 swings, the position of the rotating shaft 413 on the stopping structure 410 is unchanged relative to the valve body, and the non-return assembly can rotate around the rotating shaft 413 to open and close the exhaust passage. The connection of the valve body with the check structure 410 and the backstop component is achieved through one bracket 700, and an additional hinge shaft is not required to be provided for the backstop component, so that the structure of the product is simpler and the manufacturing cost is lower.

As shown in fig. 3, one end of the rotating shaft 413 is connected to the swing arms 412, the other end is located in the region between the two swing arms 412, and the support 700 is located between the two swing arms 412.

The two rotating shafts 413 on the stopping structure 410 are bent towards each other, the bracket 700 is located between the two swing arms 412, and the two rotating shafts 413 are inserted into the bracket 700 from the outside.

The bracket 700 includes two first assembling portions 720 arranged at intervals, and the two first assembling portions 720 are respectively rotatably connected to the two rotating shafts 413. The first assembling portion 720 is provided with a shaft hole, and the rotating shaft 413 is rotatably connected in the shaft hole.

The non-return assembly is provided with two lug plates which are arranged at intervals, each lug plate is provided with a hinge hole, and the two lug plates are positioned between the two first assembling parts 720; just be connected with joint spare in the pivot 413, the otic placode is located between first assembly portion 720 and the joint spare, joint spare is used for preventing otic placode, curb plate and pivot 413 separation.

As shown in fig. 2, the backstop assembly includes a backstop sheet 310 and a support frame 320, the support frame 320 has an ear plate thereon, the support frame 320 is located between two first assembling portions 720, and the rotating shaft 413 sequentially passes through the first assembling portions 720 and the ear plate from outside to inside and is locked by a locking member, thereby preventing the components from being separated.

The first assembling portion 720 of the rotating shaft 413 can be provided with an annular clamping groove 4131, the clamping piece is a C-shaped spring, and the C-shaped spring plays a role in stopping and limiting the lug plate.

As shown in fig. 1, 7 and 8, the fire-proof assembly includes a temperature-sensitive locking structure 600 and an elastic resetting structure, wherein the temperature-sensitive locking structure 600 is used for locking the stop structure 410 at normal temperature and unlocking when the ambient temperature is higher than a preset temperature; the elastic reset structure is connected between the valve body and the stop structure 410, and the elastic reset structure is used for driving the stop structure 410 to press the rear side surface of the non-return assembly when the temperature-sensitive locking structure 600 is unlocked.

When the check valve is used at ordinary times, the temperature-sensitive locking structure 600 limits the stop structure 410, the stop structure 410 does not influence the swinging of the check sheet 310, and the check sheet 310 can normally swing, so that the smoothness or the disconnection of an exhaust passage is realized; when a fire breaks out, the temperature around the temperature-sensitive locking structure 600 rises, when the temperature rises to a preset temperature, the temperature-sensitive locking structure 600 is unlocked, the stop structure 410 loses the limitation, and the stop structure 410 swings towards the rear surface of the check plate 310 from bottom to top under the driving of the elastic reset structure and presses on the rear surface of the check plate 310.

The elastic reset structure comprises a locking torsion spring 440, wherein the locking torsion spring 440 is installed in the region where the rotating shaft 413 is located between the first assembling portion 720 and the swing arm 412, the first assembling portion 720 and the swing arm 412 can axially limit the locking torsion spring 440, one fixed end of the locking torsion spring 440 is connected with the support 700, and the other fixed end of the locking torsion spring is connected with the stopping portion.

As shown in fig. 4, further, the first assembling portion 720 has a flange 710 stamped outwards, one fixed end of the locking torsion spring 440 abuts against the flange 710, and the fixing structure of the locking torsion spring 440 is locked by stamping, so that the extra weight of the bracket 700 is not increased.

As shown in fig. 7, the temperature-sensitive locking structure 600 includes a first portion 610 and a second portion 620, the first portion 610 is connected to the valve body, the second portion 620 is connected to the first portion 610 through a hot-melt material, and the second portion 620 is used for crimping the stopping structure 410 onto the valve body.

Wherein the heat fusible material may be metallic tin, and the first portion 610 and the second portion 620 are connected together by soldering, and when the ambient temperature reaches about 150 °, the soldering between the first portion 610 and the second portion 620 is melted. The second portion 620 loses resistance to the catch structure 410 and the catch mechanism can swing.

As shown in fig. 7 and 8, the first portion 610 is provided with a first mounting hole 7321 penetrating the first portion 610 in the vertical direction, and the lower edge of the valve body is provided with a second mounting hole corresponding to the first mounting hole 7321, so that the first portion 610 and the valve body are connected by a screw. The first part 610 is provided with a downwardly extending limiting plug-in 611, the lower edge of the valve body is provided with a limiting plug-in 222 corresponding to the limiting plug-in 611, the limiting plug-in 611 is plugged into the limiting plug-in 222, when the first part 610 is connected with the valve body, the first mounting hole 7321 and the second mounting hole can be aligned, then the limiting plug-in is plugged into the limiting plug-in 222, then a threaded piece penetrates through the first mounting hole 7321 and the second mounting hole, the threaded piece is screwed, and when the threaded piece is rotated, the limiting plug-in 222 prevents the first part 610 from rotating relative to the valve body, so that the first part 610 can be conveniently fixed.

The first accommodating hole is formed in the surface, in contact with the second part 620, of the first part 610, the second accommodating hole 621 is formed in the portion, in contact with the first part 610, of the second part 620, the first accommodating hole and the second accommodating hole 621 are aligned, tin filling can be filled in the first accommodating hole and the second accommodating hole 621, and reliable connection and falling-off prevention of parts after welding are guaranteed.

The bracket 700 is provided with a check torsion spring 360, the fixed end of the check torsion spring 360 is connected with the bracket 700, and the free end of the check torsion spring 360 is abutted against the rear side surface of the check plate 310. Specifically, the backstop torsion spring 360 may abut against the support frame 320 connected to the backstop plate 310, and the support frame 320 has a V-shaped limit groove abutting against the free end of the backstop torsion spring 360.

The bracket 700 is provided with a second assembling portion between the two first assembling portions 720, and the check torsion spring 360 is connected to the second assembling portion. A backstop torsion spring 360 is fixed on the second assembly portion, and a free end 362 of the backstop torsion spring 360 abuts against the backstop plate 310 or the support frame 320.

The non-return torsion spring 360 comprises two fixed end portions 361 and a U-shaped free end portion 362, and two sides of an opening of the free end portion 362 are respectively connected with the two fixed end portions 361; the second assembling portions include two second assembling portions arranged at intervals, and the two fixing end portions 361 of the reverse-stopping torsion spring 360 are respectively fixed on the two second assembling portions.

As shown in fig. 9, both ends of the backstop torsion spring 360 are fixed ends 361 thereof, the fixed ends 361 are fixed to the second assembly portion, and free ends 362 are U-shaped structures pressing the rear side of the backstop plate 310. The check torsion spring 360 can ensure a pre-tightening force of the check plate 310 in a closing direction under a conventional condition to make the check valve in a sealing state, and when a forward pressure reaches 80Pa, the maximum opening angle of the check plate 310 assembly can be larger than 60 degrees to ensure smooth ventilation.

The bracket 700 includes a back plate 740, the back plate 740 is connected with the valve body, first assembling portions 720 are connected to left and right sides of the back plate 740, and second assembling portions are connected to a rear side of the back plate 740.

The second assembling portion includes a first plate 731 and a second plate 732, the first plate 731 and the second plate 732 are connected to form an L-shape, one end of the first plate 731, which is far from the second plate 732, is connected to the back plate 740, and the fixed end 361 of the non-return torsion spring 360 is connected to the second plate 732.

The fixing end 361 and the second plate 732 can be fixed in various manners, such as clamping, welding, etc. In this embodiment, the fixed end 361 is fixed to the second plate 732 by a first cylindrical fastener. As shown in fig. 4, the second plate 732 is provided with a first mounting hole 7321, the fixing end 361 of the non-return torsion spring 360 is provided with a second mounting hole, and a first cylindrical fastener is inserted into the first mounting hole 7321 and the second mounting hole to fix the fixing end 361 of the non-return torsion spring 360 to the second plate 732. The first cylindrical fastening member may be a screw, and the first mounting hole 7321 of the second plate 732 is preferably countersunk so that the screw does not protrude from the second plate 732 when the reverse rotation preventing torsion spring 360 is mounted.

As shown in fig. 1, the valve body includes an outer shell 110 and an inner shell 200, the inner shell 200 is located inside the outer shell 110, the outer shell 110 has a first opening forming a vent passage, and the inner shell 200 has a second opening forming a vent passage; from the front to the back, the first opening and the second opening are arranged in sequence. The outer case 110 and the inner case 200 are connected to form an integrated structure, increasing the strength of the valve body. The temperature-sensitive locking structures 600 are all connected to the inner case 200.

As shown in fig. 10 and 12, the gas outlet of the second opening is inclined upward from front to back, so that the flue gas flowing out of the second opening also flows obliquely upward and enters into the flue, thereby reducing excessive interference with the check sheet 310 opened below, and at the same time, the check sheet 310 can be opened at least 60 ° when opened, so that the check sheet 310 can also be a guide plate for discharging the flue gas, providing a guiding effect, and further improving the oil smoke discharge efficiency.

As shown in fig. 10, the inner case 200 has an outer panel 210 thereon, the outer panel 210 is provided with a truncated cone 211 protruding to the rear side, a top surface of the truncated cone 211 is inclined upward from the front to the rear, an inclination angle of the top surface with respect to a horizontal plane may be 85 °, and the second opening is opened on the top surface of the truncated cone 211.

As shown in fig. 10, the air outlet is provided with an annular outer edge 212 protruding rearward, and a surface of the check plate 310 facing forward is provided with a concave portion corresponding to the annular outer edge 212. The annular outer edge 212 may serve as a guide, and when the check plate 310 swings forward, the annular outer edge 212 may first extend into the concave portion to guide the check plate 310 to press against the top surface of the truncated cone 211. Meanwhile, the flow path of the smoke is increased, and the sealing performance of the inclined plane plate and the check assembly is improved. When the non-return sheet 310 is opened, the annular outer edge 212 also has a certain guiding effect on inlet airflow, so that sudden change of the cross section is avoided.

Shell 110 includes medial surface board 130, first trompil is located on the medial surface board 130, be connected with on the medial surface board 130 with the installation pipe that first trompil is connected, the installation pipe is located the house owner insidely, the installation pipe is used for the joint air pipe, and the lampblack absorber is connected to the opposite side of tuber pipe.

As shown in fig. 6, the installation pipe has a stepped structure, the installation pipe includes a plurality of installation sections 121 connected in sequence, and of two adjacent installation sections 121, the outer diameter of the installation section 121 near the front is smaller than the outer diameter of the installation section 121 near the rear. So that the mounting tube can be adapted to air ducts of different diameters, in this embodiment the mounting tube comprises two mounting sections 121. In order to improve the connection strength of the air pipe, a fixing pin hole is formed in the outer wall of the mounting section 121, and a locking pin penetrates through the air pipe and the pin hole to connect the air pipe and the mounting pipe.

As shown in fig. 7 to 9, the outer shell 110 includes a first surrounding edge 140 disposed on a circumferential side of the inner side panel 130, and a flange 111 is disposed on an outer side wall of the first surrounding edge 140, and the flange 111 is used for connecting with a wall surface. The flange 111 is provided with four through holes which penetrate through the flange 111 along the front-back direction, and after the fireproof check valve is installed on a wall, two holes of the fireproof check valve can be fixed by self-drilling and self-tapping screws, so that the pre-tightening force of the fireproof check valve can be further improved.

As shown in fig. 13, a folded edge 1111 bent backward may be provided at an outer circumferential edge of the flange 111. Before the valve body is installed, silica gel can be uniformly coated on the rear side face of the flange 111, then the fireproof one-way valve is installed on the wall face of a public flue, the silica gel can play a sealing role, and the folded edge 1111 can be in contact with the wall face, so that a certain gap is reserved between the rear side face of the flange 111 and the wall body, the silica gel is contained, and the silica gel is prevented from being extruded to overflow.

As shown in fig. 1, 12 and 14, a pre-tightening torsion spring 510 is disposed on a side wall of the valve body, and the pre-tightening torsion spring 510 can swing in the inward and outward directions; in a natural state, the free end of the pre-tightening torsion spring 510 is located on the outer side of the valve body, so that the free end of the pre-tightening torsion spring 510 can be abutted against the side wall of the wall mounting hole.

The pretension torsional spring 510 can be arranged on the left side and the right side of the valve body, when the valve body is installed, the two pretension torsional springs 510 can be extruded inwards firstly, free ends of the two pretension torsional springs 510 are tightened to the central position through a binding belt, the free ends of the two pretension torsional springs 510 are all arranged on the inner side of the inner shell 200 and then stretch into the installation hole of the wall body, the binding belt is cut to release the pretension torsional springs 510, the two pretension torsional springs 510 are all opened towards the outer side, and therefore the pretension torsional springs are clamped with the hole wall of the installation hole, and the pretension torsional spring achieves the effect of pre-fixing. The fireproof check valve is guaranteed not to fall off after being installed in the flue, and after the silica gel at the position of the flange 111 is solidified, the reliability of fixing of the fireproof check valve can be further improved.

As shown in fig. 14, the outer shell 110 includes a first peripheral edge 140 disposed on a peripheral side of the inner side panel 130; the inner shell 200 comprises an outer side panel 210, the second opening is arranged on the outer side panel 210, and a second surrounding edge 220 is arranged on the circumferential side of the outer side panel 210; the second peripheral edge 220 is located inside the first peripheral edge 140; the fixed end of the pre-tightening torsion spring 510 is connected between the first surrounding edge 140 and the second surrounding edge 220, and the first surrounding edge 140 and the second surrounding edge 220 can limit the fixed end of the pre-tightening torsion spring 510 and prevent the fixed end of the pre-tightening torsion spring 510 from moving in the inner and outer directions relative to the valve body.

Further, as shown in fig. 10, a sunken platform 223 is provided on the second surrounding edge 220 and is recessed inward, and the sunken platform 223 plays a role of providing an escape space. A gap is formed between the bottom surface of the sinking platform 223 and the first surrounding edge 140, and the fixed end of the pre-tightening torsion spring 510 is located in the gap. Mounting holes are correspondingly formed in the bottom surface of the sinking platform 223, the fixed end of the pre-tightening torsion spring 510 and the first surrounding edge 140 respectively, so that a threaded part penetrates through the bottom surface of the sinking platform 223, the fixed end of the pre-tightening torsion spring 510 and the first surrounding edge 140 respectively and then is locked, and therefore the pre-tightening spring is prevented from moving relative to the valve body.

The mounting hole of the first surrounding edge 140 is a counter bore, so that the head end of the screw member for connecting the pre-tightening torsion spring 510 can be sunk into the counter bore, and the first surrounding edge 140 is more flat.

As shown in fig. 10, the second surrounding edge 220 includes an upper flange 710, a lower flange 710, a left flange 710 and a right flange 710 respectively located at the upper side, the lower side, the left side and the right side of the outer side panel 210, and the upper flange 710, the lower flange 710, the left flange 710 and the right flange 710 are welded to each other. The surrounding flanges 710 are welded together, so that the pressure resistance of the inner shell 200 can be improved, and the inner shell 200 is prevented from deforming.

As shown in fig. 13, when the ratchets 310 are in the closed state, the ratchets 310 are located inside the second surrounding edge 220; in the front-back direction, the back edge of the second surrounding edge 220 protrudes backward from the back edge of the first surrounding edge 140.

After the inner shell 200 is installed, the rear end of the second surrounding edge 220 extends out of the first surrounding edge 140, the distance d that can extend out is about 5mm approximately, and because the flange 111 is arranged at the rear edge of the first surrounding edge 140, the extending part of the second surrounding edge 220 can extend into the installation hole of the wall when the flange 111 of the check valve is tightly attached to the wall, so that the diameter of the installation hole in the wall is at least larger than that of the second surrounding edge 220, the situation that a constructor opens the installation hole small can be avoided, and the check sheet 310 abuts against the hole wall of the installation hole.

In order to improve the sealing performance of the product, a sealing material, which may be silica gel, is filled between the outer shell 110 and the inner shell 200, so as to prevent smoke from entering from the first opening and then flowing into a portion between the outer shell 110 and the inner shell 200, which may generate noise.

As shown in fig. 11, the inner side panel 130 and the outer side panel 210 may be connected by screws, and four countersunk holes may be formed in the inner side panel 130, so that the front side of the inner side panel 130 is more flat and beautiful after the screws are locked. At a position corresponding to the countersunk hole, the outer panel 210 is provided with a rearwardly recessed counter sink 223 for avoiding the countersunk hole at the rear side of the inner panel 130.

The front of valve body is carved with upward arrow point, and the accurate installation direction when suggestion installer installs prevents to adorn conversely.

The valve body is carved with the data plate of the fireproof one-way valve, so that the manufacture of the independent data plate can be omitted, the cost can be further reduced, and the reliability and the durability of the data plate are also improved.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A check valve, comprising: the fire-proof assembly comprises a stopping structure (410), and the stopping structure (410) is used for swinging to the rear side of the non-return assembly after being unlocked and abutting the non-return assembly on the air outlet;

the support (700) is arranged on the valve body, the stopping structure (410) comprises a stopping part and swing arms (412) positioned at two ends of the stopping part, each swing arm (412) is connected with a rotating shaft (413), and the rotating shafts (413) are rotatably connected with the support (700);

the backstop component is provided with a hinge hole and is rotationally connected with the rotating shaft (413) through the hinge hole.

2. Non-return valve according to claim 1, characterized in that the shaft (413) is connected at one end to a swing arm (412) and at the other end in the area between the two swing arms (412), the bracket (700) being located between the two swing arms (412).

3. The check valve of claim 2, wherein the bracket (700) comprises two first assembling portions (720) arranged at intervals, and the two first assembling portions (720) are respectively rotatably connected with the two rotating shafts (413).

4. The check valve of claim 3 wherein the backstop assembly has two spaced lugs, each lug having a hinge bore,

both of the ear plates are located between the two first fitting parts (720);

just be connected with joint spare in pivot (413), the otic placode is located between first assembly portion (720) and the joint spare, joint spare is used for preventing otic placode, curb plate and pivot (413) separation.

5. The check valve of claim 4, wherein the shaft (413) has a ring-shaped groove (4131), and the engaging member is a C-shaped spring.

6. The check valve of claim 4, wherein the fire protection assembly comprises a temperature-sensitive locking structure (600) and an elastic return structure, the temperature-sensitive locking structure (600) is used for locking the stop structure (410) at normal temperature and unlocking when the ambient temperature is higher than a preset temperature; the elastic reset structure is connected between the valve body and the stop structure (410), and the elastic reset structure is used for driving the stop structure (410) to be pressed on the rear side face of the non-return assembly when the temperature-sensitive locking structure (600) is unlocked.

7. The check valve of claim 6, wherein the elastic restoring structure comprises a locking torsion spring (440), the locking torsion spring (440) is installed at a region of the rotation shaft (413) between the first fitting portion (720) and the swing arm (412), and one fixed end of the locking torsion spring (440) is connected with the bracket (700) and the other fixed end is connected with the stopper portion.

8. The check valve according to claim 7, wherein the first fitting portion (720) has a burring (710) punched outward, and one fixed end of the locking torsion spring (440) abuts against the burring (710).

9. The check valve of claim 6, wherein the temperature sensitive locking structure (600) comprises a first portion (610) and a second portion (620), the first portion (610) is connected with the valve body, the second portion (620) is connected with the first portion (610) through a hot melt material, and the second portion (620) is used for pressing the stop structure (410) on the valve body.

10. The check valve according to claim 4, characterized in that a non-return torsion spring (360) is arranged on the bracket (700), a fixed end of the non-return torsion spring (360) is connected with the bracket (700), and a free end of the non-return torsion spring (360) is abutted against a rear side surface of the non-return assembly.

11. The check valve according to claim 10, wherein the bracket (700) is provided with a second fitting portion between the two first fitting portions (720), the check torsion spring (360) being connected with the second fitting portion.

12. The non-return valve according to claim 11, characterized in that the non-return torsion spring (360) comprises two fixed ends (361) and a U-shaped free end (362), the two sides of the opening of the free end (362) being connected with the two fixed ends (361), respectively;

the second assembling parts comprise two parts which are arranged at intervals, and two fixed end parts (361) of the non-return torsion spring (360) are respectively fixed on the two second assembling parts.

13. The non-return valve according to any one of claims 1 to 12, characterized in that the valve body comprises an outer housing (110) and an inner housing (200), the inner housing (200) being located inside the outer housing (110);

the outer shell (110) is provided with a first opening forming an exhaust passage, and the inner shell (200) is provided with a second opening forming an exhaust passage; from the front to the back, the first opening and the second opening are arranged in sequence.

14. The check valve of claim 13, wherein the outlet of the second opening is inclined upward from front to rear.

15. The check valve according to claim 13, wherein the inner housing (200) has an outer side panel (210) thereon, the outer side panel (210) is provided with a truncated cone (211) protruding to a rear side, a top surface of the truncated cone (211) is inclined upward from front to rear, and the second opening is opened in the top surface of the truncated cone (211).