CN212377378U - Roof formula check valve for fan convenient to it is fixed - Google Patents

Abstract

The utility model discloses a check valve for a roof type fan convenient to fix, which comprises a hollow square tube, fixing devices arranged at the upper end and the lower end of the hollow square tube, and a sealing device arranged in the hollow square tube and used for isolating indoor and outdoor air exchange; the utility model discloses a check valve installation is convenient, easy operation.

Description

Roof formula check valve for fan convenient to it is fixed

Technical Field

The utility model belongs to the technical field of the fan technique and specifically relates to a check valve for roof formula fan convenient to it is fixed is related to.

Background

At present, according to the development situation of domestic industry and civil buildings, the requirement on building ventilation is higher and higher, a roof type air feeder generally does not need to supply air to the indoor in winter, and usually in an unused state, the outdoor pipe and the indoor pipe are communicated through a fan in the state, indoor air and outdoor air can be exchanged, and the indoor air cannot keep warm; in order to prevent outdoor air from flowing backwards indoors and isolate indoor and outdoor air exchange, the device for preventing indoor and outdoor air exchange needs to be provided, and due to the particularity of roof fan installation, the fan is vertically installed, so that the check valve is required to be horizontally installed, most of the existing check valves are connected by utilizing a screw and nut structure in the installation process, and the installation is very inconvenient.

Disclosure of Invention

The utility model discloses an overcome prior art not enough, provide a roof formula check valve for fan convenient to it is fixed, easy operation, it is convenient to install.

In order to achieve the above purpose, the utility model adopts the following technical scheme: a roof type check valve convenient to fix for a fan comprises a hollow square tube, fixing devices arranged at the upper end and the lower end of the hollow square tube, and a sealing device arranged in the hollow square tube and used for isolating indoor and outdoor air exchange, wherein each fixing device comprises a first fixing component arranged at the upper end of the hollow square tube and a second fixing component arranged at the lower end of the hollow square tube, the first fixing component and the second fixing component are identical in structure, each first fixing component comprises four first T-shaped blocks fixedly arranged at the upper ends of the four side walls of the hollow square tube, a plurality of sliding blocks slidably arranged on the first T-shaped blocks, a first guide post and a second guide post fixedly arranged on the sliding blocks, an inclined block simultaneously sleeved on the first guide post and the second guide post, a fourth spring fixedly arranged at the other end of each sliding block and arranged on the inclined block, a plurality of T-shaped grooves arranged at the upper ends of the four side walls, The steel wire rope winding device comprises a second T-shaped block, a first push plate, a second push plate, a third push plate and a fourth push plate, wherein the second push plate, the third push plate and the fourth push plate are simultaneously and fixedly arranged on the second T-shaped block on the same side wall of a hollow square pipe; the elastic force of the fourth spring is greater than that of the fifth spring; the long rod is rotated clockwise, the steel wire rope wound on the long rod moves towards one direction, the plurality of sliding blocks are connected through the steel wire rope, so that the plurality of sliding blocks move towards one direction along the direction of the first T-shaped block, the first guide rod, the second guide rod and the inclined block on the sliding blocks move along with the first T-shaped block, the inclined block moves to the convex plate, the elastic force of the fourth spring is greater than that of the fifth spring, so that the first push plate, the second push plate, the third push plate and the fourth push plate move towards the outer side of the hollow square pipe respectively, the first push plate, the second push plate, the third push plate and the fourth push plate are contacted with the inner wall of the opening to complete fixation, the fixation adaptability of the fourth spring is improved, the fourth spring pushes the first push plate, the second push plate, the third push plate and the fourth push plate to ensure that the fixation is convenient and rapid, and the steel wire rope forms a rectangle through the arrangement of the first, the sliding blocks are subjected to the force in the direction of the first T-shaped block in the moving process of the steel wire rope, so that the sliding blocks can be pulled to move, the steel wire rope is better contacted with the long rod through the arrangement of the extrusion roller, the long rod and the steel wire rope are prevented from sliding to influence the fixation, and meanwhile, the sliding blocks can be prevented from moving again after being moved to the specified position, namely the sliding blocks move after the check valve is fixed, and the infirm fixation of the check valve is avoided; to sum up, the check valve is convenient to install and simple to operate.

The sealing device comprises a first sealing baffle and a second sealing baffle which are fixedly arranged on the inner wall of the hollow square tube, a first shaft mop and a second shaft mop which are fixedly arranged on the other inner wall of the hollow square tube, a plurality of rotating shafts which are respectively arranged on the first shaft mop and the second shaft mop in a rotating mode at two ends, a plurality of eccentric blades which are fixedly arranged on the plurality of rotating shafts, a plurality of first connecting pieces and a plurality of second connecting pieces which are fixedly arranged on the short sides of the plurality of eccentric blades, a stop lever which is fixedly arranged on the inner wall of the hollow square tube, a first connecting rod which is rotatably arranged with the plurality of first connecting pieces, a second connecting rod which is rotatably arranged with the plurality of second connecting pieces, a first adjusting block which is arranged in the middle of the first connecting rod, a second adjusting block which is arranged in the middle of the second connecting rod, a first magnet and a second magnet which are respectively fixedly arranged on the first adjusting block and the second adjusting block, a third magnet and a fourth magnet which are respectively arranged on the inner wall of, The first grooves are formed in the end face of the third magnet, and the second grooves are formed in the end face of the fourth magnet; when the roof blower is not operated, the short side weight of the eccentric blade is applied by a first connecting rod and a second connecting rod as well as a first adjusting block and a second adjusting block, the weight of the short side of the eccentric blade is greater than that of the long side, and the blade is closed by utilizing a lever principle; when the roof blower blows air to the indoor, because the pressure generated by the blower is applied to the eccentric blade, the long-side pressure of the eccentric blade is larger than the short-side pressure, when a certain pressure difference exists, the long-side pressure of the eccentric blade overcomes the gravity of the short side, so that the eccentric blade rotates around the axis of the rotating shaft, and even if the eccentric blade is opened, the opening pressure can be adjusted through the first adjusting block and the second adjusting block; the first sealing baffle and the second sealing baffle seal the eccentric blade at the head end and the eccentric blade at the tail end and limit the eccentric blades at the tail end at the same time, so that the eccentric blades are horizontally arranged in a closed state; the opening angle of the eccentric blade can be limited by the fixed position of the stop lever; by the aid of the air conditioner, on the premise that installation space and electric control are not increased, outdoor air is prevented from flowing back indoors under the condition that the fan is not started, and indoor and outdoor air exchange is isolated; the check valve is very convenient to install, can be embedded in a hole formed in the basis of the roof blower, does not need extra installation space, is higher in reliability and safety due to no intervention in the aspect of electricity, reduces the management cost and the manufacturing cost, and has no very high market prospect. The first magnet is arranged on the first adjusting block, the second magnet is arranged on the second adjusting block, the third magnet and the fourth magnet are arranged on the inner wall of the hollow square tube, so that in the opening process of the eccentric blade, the first magnet and the third magnet generate attraction force with each other, the second magnet and the fourth magnet generate attraction force with each other, thereby be convenient for eccentric blade open, through the aforesaid setting up forced draught blower adjustment wind-force size in-process, make eccentric blade remain the open mode throughout, the forced draught blower is closed through a plurality of first recesses on the third magnet terminal surface and a plurality of second recesses on the fourth magnet terminal surface, make first magnet and third magnet area of contact reduce, make second magnet and fourth magnet area of contact reduce, rethread first adjusting block and second adjusting block make break away from between first magnet and the third magnet and second magnet and break away from with fourth magnet, simultaneously above-mentioned setting can play the effect of delaying to close to eccentric blade.

The sealing device also comprises a plurality of turning plates which are arranged on one long side of the eccentric blade and can be turned upwards, a plurality of arc guide rails which penetrate through the turning plates and are fixedly arranged on the eccentric blade, a third spring with one end fixedly arranged on the eccentric blade and the other end fixedly arranged on the turning plates and sleeved on the arc guide rails, a plurality of rollers which are positioned at the two ends of the turning plates and are rotatably arranged on the inner wall of the hollow square tube, a plurality of eccentric air deflectors which are positioned above the eccentric blade and are rotatably arranged on the inner wall of the hollow square tube, limiting grooves which are arranged at the two sides of the eccentric air deflectors and are arranged on the inner wall of the hollow square tube, limiting rods which are fixedly arranged at the two sides of the eccentric air deflectors and are arranged, the special-shaped air guide plate group comprises a first special-shaped plate and a second special-shaped plate, the first special-shaped plate and the second special-shaped plate are identical in structure, and the first special-shaped plate comprises a first arc-shaped section, a second arc-shaped section and a vertical section; when the eccentric blades are opened, the plurality of turning plates on the eccentric blades are turned over through the third springs, so that the resistance of the surfaces of the eccentric blades is improved in the process of supplying air to the indoor space, the eccentric blades are opened more easily, the turning plates on the eccentric blades are contacted with the rollers when the eccentric blades are closed, the turning plates are closed through the extrusion of the rollers, the rollers are rotatably arranged on the hollow square tubes, the rollers are positioned on the surfaces of the turning plates to roll in the process of extruding the turning plates through the rollers, and the friction between the rollers and the; wind acts on the eccentric blade in the process of supplying air to the indoor, partial wind acts on the eccentric air deflector, namely a downward conical air supply channel is formed between the eccentric air deflector and the eccentric blade, and respectively supplies reverse acting force to the eccentric air deflector and the eccentric blade to rotate, the rotating angle of the eccentric air deflector is controlled by a limiting groove and a limiting rod, so that the pressure difference of the eccentric blade is improved, the eccentric blade is easier to open, the turning plate is also opened in the opening process of the eccentric blade, partial wind is supplied to the indoor through the opening position of the turning plate, the clockwise thrust of the wind on the eccentric blade by the side edge is counteracted, the eccentric blade is better kept in the opening state, the wind direction of the wind supplied to the indoor is changed through the arrangement of a plurality of groups of special-shaped air deflector groups, the wind speed between the first special-shaped plate and the second special-shaped plate is accelerated through the arrangement of the first special-shaped, the wind speed on the surface of the eccentric blade is accelerated, so that more wind energy can act on the eccentric blade, the eccentric blade is kept in a maximum opening state in the air supply adjusting process, the resistance force applied in the air supply process is reduced, the wind direction below the eccentric blade is changed through the first arc-shaped section and the second arc-shaped section, a vortex is formed between the first arc-shaped section and the second arc-shaped section on the second special-shaped plate and the eccentric blade, the suction force in the anticlockwise direction is generated on the eccentric blade through the first arc-shaped section and the second arc-shaped section on the first special-shaped plate in a similar way, and the wind energy which is most always sent into a room can be vertically downward through the arrangement of the vertical section; in the process of exhausting air to the outdoor, firstly, air is supplied to the indoor to open the eccentric blade, then the extension tooth of the eccentric blade is closed, the air supply direction is changed, the indoor air is exhausted to the outdoor, an upward conical air supply channel is formed between the eccentric air deflector and the eccentric blade, and the eccentric blade is kept in an open state, the turning plate is arranged to gather wind and improve resistance to wind acting on the eccentric blade, the wind power anticlockwise borne by the eccentric blade is improved, partial wind passes through the opening at the turning plate to offset the clockwise force of the wind at the side edge of the eccentric blade, the wind power above the first arc-shaped section and the second arc-shaped section on the second special-shaped plate is reduced, the wind power below the eccentric blade, namely the clockwise wind power to the eccentric blade, is obliquely upward in the air exhaust process through the first arc-shaped section on the first special-shaped plate, so that the anticlockwise wind power to the eccentric blade is improved; through the arrangement, the check valve can be sealed, and can realize bidirectional air supply and the opening of the check valve is not influenced by the size of the air supply.

The utility model has the advantages of it is following: the stock rotates clockwise, makes the wire rope of winding on the stock remove towards an orientation, a plurality of sliders pass through wire rope and connect, thereby make a plurality of sliders remove towards an orientation along first T type piece orientation, first guide bar and second guide bar and sloping on the slider follow and remove, make the sloping remove to the flange on, elasticity through the fourth spring is greater than the elasticity of fifth spring, thereby make first push pedal and second push pedal and third push pedal and fourth push pedal remove to hollow square outside of tubes respectively, make first push pedal, second push pedal and third push pedal and fourth push pedal and open a hole inner wall contact completion fixed, to sum up the check valve installation is convenient, easy operation.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a side view of the present invention.

Fig. 3 is a sectional view taken along line B-B of fig. 2.

Fig. 4 is an enlarged view of a portion a in fig. 3.

Fig. 5 is a schematic side view of the present invention.

Fig. 6 is a sectional view taken along line a-a of fig. 5.

Fig. 7 is an enlarged view of fig. 6 at B.

Fig. 8 is a sectional view taken along line C-C of fig. 3.

Fig. 9 is a top view of the present invention.

Fig. 10 is an enlarged view of fig. 9 at C.

Fig. 11 is a usage state diagram of air blowing into a room.

Fig. 12 is a view showing a state of use of the outdoor discharge air.

Detailed Description

In order to make the technical solution of the present invention better understood, the following figures in the embodiments of the present invention are combined to clearly and completely describe the technical solution in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts shall belong to the protection scope of the present invention.

As shown in fig. 1 to 12, a check valve for a roof fan convenient to fix comprises a hollow square tube 1, a fixing device 2 disposed at the upper and lower ends of the hollow square tube, and a sealing device 3 disposed in the hollow square tube for isolating indoor and outdoor air exchange, wherein the fixing device 2 comprises a first fixing assembly 21 disposed at the upper end of the hollow square tube, and a second fixing assembly 22 disposed at the lower end of the hollow square tube, the first fixing assembly has the same structure as the second fixing assembly, the first fixing assembly 21 comprises four first T-shaped blocks 211 fixedly disposed at the upper ends of the four side walls of the hollow square tube, a plurality of sliding blocks 212 slidably disposed on the first T-shaped blocks, a first guide post 213 and a second guide post 214 fixedly disposed on the sliding blocks, an oblique block 215 simultaneously sleeved on the first guide post and the second guide post, and a fourth spring 216, one end of which is fixedly disposed on the oblique block, and the other end of which is fixedly disposed on the oblique, A plurality of T-shaped grooves 217 arranged at the upper ends of four side walls of the hollow square tube, a second T-shaped block 218 arranged in the T-shaped grooves, a first push plate 219, a second push plate 220, a third push plate 221 and a fourth push plate 222 which are simultaneously fixed on the second T-shaped block on the same side wall of the hollow square tube, a fifth spring 223 with one end fixed on the second T-shaped block and the other end fixed on the inner wall of the hollow square tube, a plurality of convex plates 224 respectively fixed on the first push plate, the second push plate, the third push plate and the fourth push plate, a first roller 225, a second roller 226 and a third roller 227 rotatably arranged at the corners of the hollow square tube, a steel wire rope 228 used for connecting a plurality of sliders and respectively wound on the first roller, the second roller and the third roller, a long rod 229 positioned at the corners of the hollow square tube and penetrating through the side wall of the hollow steel tube, an extrusion roller 230 positioned at one side of, the steel wire rope part on the second fixing component is wound on the long rod; the elastic force of the fourth spring is greater than that of the fifth spring; the long rod is rotated clockwise, the steel wire rope wound on the long rod moves towards one direction, the plurality of sliding blocks are connected through the steel wire rope, so that the plurality of sliding blocks move towards one direction along the direction of the first T-shaped block, the first guide rod, the second guide rod and the inclined block on the sliding blocks move along with the first T-shaped block, the inclined block moves to the convex plate, the elastic force of the fourth spring is greater than that of the fifth spring, so that the first push plate, the second push plate, the third push plate and the fourth push plate move towards the outer side of the hollow square pipe respectively, the first push plate, the second push plate, the third push plate and the fourth push plate are contacted with the inner wall of the opening to complete fixation, the fixation adaptability of the fourth spring is improved, the fourth spring pushes the first push plate, the second push plate, the third push plate and the fourth push plate to ensure that the fixation is convenient and rapid, and the steel wire rope forms a rectangle through the arrangement of the first, the sliding blocks are subjected to the force in the direction of the first T-shaped block in the moving process of the steel wire rope, so that the sliding blocks can be pulled to move, the steel wire rope is better contacted with the long rod through the arrangement of the extrusion roller, the long rod and the steel wire rope are prevented from sliding to influence the fixation, and meanwhile, the sliding blocks can be prevented from moving again after being moved to the specified position, namely the sliding blocks move after the check valve is fixed, and the infirm fixation of the check valve is avoided; the long rod is rotated anticlockwise, so that the sliding block moves reversely, even if the inclined block is separated from the convex plate, the first push plate, the second push plate, the third push plate and the fourth push plate can return to the original positions through the arrangement of the fifth spring, the next installation is facilitated, and the convenience in installation and disassembly is achieved; the upper end and the lower end of the hollow square tube are fixed through the first fixing component and the second fixing component respectively, so that the fixing is firmer, and the upper end and the lower end of the hollow square tube are fixed synchronously.

The sealing device 3 comprises a first sealing baffle 31 and a second sealing baffle 32 which are fixedly arranged on the opposite inner wall of the hollow square tube, a first shaft support 33 and a second shaft support 34 which are fixedly arranged on the other opposite inner wall of the hollow square tube, a plurality of rotating shafts 35 with two ends respectively rotatably arranged on the first shaft support and the second shaft support, a plurality of eccentric blades 36 fixedly arranged on the plurality of rotating shafts, a plurality of first connecting pieces 37 and second connecting pieces 38 fixedly arranged on the short sides of the plurality of eccentric blades, a stop rod 39 fixedly arranged on the inner wall of the hollow square tube, a first connecting rod 310 rotatably arranged with the plurality of first connecting pieces, a second connecting rod 311 rotatably arranged with the plurality of second connecting pieces, a first adjusting block 312 arranged in the middle of the first connecting rod, a second adjusting block 313 arranged in the middle of the second connecting rod, a first magnet 320 and a second magnet 321 respectively fixedly arranged on the first adjusting block and the second adjusting block, A third magnet 322 and a fourth magnet 323 which are fixedly arranged on the inner wall of the hollow square tube and are respectively used for matching the first magnet and the second magnet, a plurality of first grooves arranged on the end surface of the third magnet and a plurality of second grooves arranged on the end surface of the fourth magnet; when the roof blower is not operated, the short side weight of the eccentric blade is applied by a first connecting rod and a second connecting rod as well as a first adjusting block and a second adjusting block, the weight of the short side of the eccentric blade is greater than that of the long side, and the blade is closed by utilizing a lever principle; when the roof blower blows air to the indoor, because the pressure generated by the blower is applied to the eccentric blade, the long-side pressure of the eccentric blade is larger than the short-side pressure, when a certain pressure difference exists, the long-side pressure of the eccentric blade overcomes the gravity of the short side, so that the eccentric blade rotates around the axis of the rotating shaft, and even if the eccentric blade is opened, the opening pressure can be adjusted through the first adjusting block and the second adjusting block; the first sealing baffle and the second sealing baffle seal the eccentric blade at the head end and the eccentric blade at the tail end and limit the eccentric blades at the tail end at the same time, so that the eccentric blades are horizontally arranged in a closed state; the opening angle of the eccentric blade can be limited by the fixed position of the stop lever; by the aid of the air conditioner, on the premise that installation space and electric control are not increased, outdoor air is prevented from flowing back indoors under the condition that the fan is not started, and indoor and outdoor air exchange is isolated; the check valve is very convenient to install, can be embedded in a hole formed in the basis of the roof blower, does not need extra installation space, is higher in reliability and safety due to no intervention in the aspect of electricity, reduces the management cost and the manufacturing cost, and has no very high market prospect. The first magnet is arranged on the first adjusting block, the second magnet is arranged on the second adjusting block, the third magnet and the fourth magnet are arranged on the inner wall of the hollow square tube, so that in the opening process of the eccentric blade, the first magnet and the third magnet generate attraction force with each other, the second magnet and the fourth magnet generate attraction force with each other, thereby be convenient for eccentric blade open, through the aforesaid setting up forced draught blower adjustment wind-force size in-process, make eccentric blade remain the open mode throughout, the forced draught blower is closed through a plurality of first recesses on the third magnet terminal surface and a plurality of second recesses on the fourth magnet terminal surface, make first magnet and third magnet area of contact reduce, make second magnet and fourth magnet area of contact reduce, rethread first adjusting block and second adjusting block make break away from between first magnet and the third magnet and second magnet and break away from with fourth magnet, simultaneously above-mentioned setting can play the effect of delaying to close to eccentric blade.

The sealing device 3 further comprises a plurality of turning plates 326 which are arranged on one long side of the eccentric blade and can be turned upwards, a plurality of arc-shaped guide rails 327 which penetrate through the turning plates and are fixedly arranged on the eccentric blade, a third spring 328 which is fixedly arranged on the eccentric blade and is sleeved on the arc-shaped guide rails at the other end, a plurality of rollers 329 which are positioned on the inner wall of the hollow square tube at the two ends of the turning plates and are rotatably arranged on the inner wall of the hollow square tube, a plurality of eccentric air deflectors 330 which are positioned above the eccentric blade and are rotatably arranged on the inner wall of the hollow square tube, limiting grooves 331 which are arranged on the two sides of the eccentric air deflectors and are arranged on the inner wall of the hollow square tube, limiting rods 332 which are fixedly arranged on the two sides of the eccentric air deflectors and are arranged in the limiting grooves, a plurality of special-shaped air deflector groups which are positioned below the eccentric blade and, the first profiled plate 333 comprises a first arc-shaped section 335, a second arc-shaped section 336 and a vertical section 337; when the eccentric blades are opened, the plurality of turning plates on the eccentric blades are turned over through the third springs, so that the resistance of the surfaces of the eccentric blades is improved in the process of supplying air to the indoor space, the eccentric blades are opened more easily, the turning plates on the eccentric blades are contacted with the rollers when the eccentric blades are closed, the turning plates are closed through the extrusion of the rollers, the rollers are rotatably arranged on the hollow square tubes, the rollers are positioned on the surfaces of the turning plates to roll in the process of extruding the turning plates through the rollers, and the friction between the rollers and the; wind acts on the eccentric blade in the process of supplying air to the indoor, partial wind acts on the eccentric air deflector, namely a downward conical air supply channel is formed between the eccentric air deflector and the eccentric blade, and respectively supplies reverse acting force to the eccentric air deflector and the eccentric blade to rotate, the rotating angle of the eccentric air deflector is controlled by a limiting groove and a limiting rod, so that the pressure difference of the eccentric blade is improved, the eccentric blade is easier to open, the turning plate is also opened in the opening process of the eccentric blade, partial wind is supplied to the indoor through the opening position of the turning plate, the clockwise thrust of the wind on the eccentric blade by the side edge is counteracted, the eccentric blade is better kept in the opening state, the wind direction of the wind supplied to the indoor is changed through the arrangement of a plurality of groups of special-shaped air deflector groups, the wind speed between the first special-shaped plate and the second special-shaped plate is accelerated through the arrangement of the first special-shaped, the wind speed on the surface of the eccentric blade is accelerated, so that more wind energy can act on the eccentric blade, the eccentric blade is kept in a maximum opening state in the air supply adjusting process, the resistance force applied in the air supply process is reduced, the wind direction below the eccentric blade is changed through the first arc-shaped section and the second arc-shaped section, a vortex is formed between the first arc-shaped section and the second arc-shaped section on the second special-shaped plate and the eccentric blade, the suction force in the anticlockwise direction is generated on the eccentric blade through the first arc-shaped section and the second arc-shaped section on the first special-shaped plate in a similar way, and the wind energy which is most always sent into a room can be vertically downward through the arrangement of the vertical section; in the process of exhausting air to the outdoor, firstly, air is supplied to the indoor to open the eccentric blade, then the extension tooth of the eccentric blade is closed, the air supply direction is changed, the indoor air is exhausted to the outdoor, an upward conical air supply channel is formed between the eccentric air deflector and the eccentric blade, and the eccentric blade is kept in an open state, the turning plate is arranged to gather wind and improve resistance to wind acting on the eccentric blade, the wind power anticlockwise borne by the eccentric blade is improved, partial wind passes through the opening at the turning plate to offset the clockwise force of the wind at the side edge of the eccentric blade, the wind power above the first arc-shaped section and the second arc-shaped section on the second special-shaped plate is reduced, the wind power below the eccentric blade, namely the clockwise wind power to the eccentric blade, is obliquely upward in the air exhaust process through the first arc-shaped section on the first special-shaped plate, so that the anticlockwise wind power to the eccentric blade is improved; through the arrangement, the check valve can be sealed, bidirectional air supply can be realized, and the opening of the check valve is not influenced by the size of the air supply; because the electric intervention is not needed, the reliability and the safety are higher, the management cost and the manufacturing cost are reduced, and the market prospect is not very high.

Claims (3)

1. The utility model provides a check valve for roof formula fan convenient to it is fixed which characterized in that: including hollow square pipe (1), locate fixing device (2) at both ends about hollow square pipe, locate the interior sealing device (3) that is used for isolated indoor outer air exchange of hollow square pipe, fixing device (2) are including locating first fixed subassembly (21) of hollow square pipe upper end, locating second fixed subassembly (22) of hollow square pipe lower extreme, first fixed subassembly structure is the same with the fixed subassembly structure of second, first fixed subassembly (21) are including fixed four first T type pieces (211) of locating hollow square pipe four lateral wall upper ends, slidable locate a plurality of sliders (212) on first T type piece, fixed first guide post (213) and the second guide post (214) of locating on the slider, simultaneously overlap sloping block (215) on first guide post and the second guide post, one end is fixed and is located fourth spring (216) that the other end was fixed to locate on the slider on the sloping block, A plurality of T-shaped grooves (217) arranged at the upper ends of four side walls of the hollow square tube, a second T-shaped block (218) arranged in the T-shaped grooves, a first push plate (219), a second push plate (220), a third push plate (221) and a fourth push plate (222) which are simultaneously fixed on the second T-shaped block on the same side wall of the hollow square tube, a fifth spring (223) with one end fixed on the second T-shaped block and the other end fixed on the inner wall of the hollow square tube, a plurality of convex plates (224) respectively fixed on the first push plate, the second push plate, the third push plate and the fourth push plate, a first roller (225), a second roller (226) and a third roller (227) rotatably arranged at the corner of the hollow square tube, steel wire ropes (228) used for connecting a plurality of slide blocks and respectively winding on the first roller, the second roller and the third roller, a long rod (229) positioned at the corner of the hollow square tube and penetrating through the side wall of the hollow, part of the steel wire rope is wound on the long rod, and the steel wire rope on the second fixing component is wound on the long rod; the elastic force of the fourth spring is greater than that of the fifth spring.

2. The easy-to-fix check valve for roof fan as claimed in claim 1, wherein: the sealing device (3) comprises a first sealing block (31) and a second sealing block (32) which are fixedly arranged on the inner wall of the hollow square tube, a first shaft support (33) and a second shaft support (34) which are fixedly arranged on the other inner wall of the hollow square tube, a plurality of rotating shafts (35) which are respectively rotatably arranged on the first shaft support and the second shaft support, a plurality of eccentric blades (36) which are fixedly arranged on the rotating shafts, a plurality of first connecting pieces (37) and second connecting pieces (38) which are fixedly arranged on the short sides of the eccentric blades, a blocking rod (39) which is fixedly arranged on the inner wall of the hollow square tube, a first connecting rod (310) which is simultaneously and rotatably arranged with the first connecting pieces, a second connecting rod (311) which is simultaneously and rotatably arranged with the second connecting pieces, a first adjusting block (312) which is arranged in the middle of the first connecting rod, a second adjusting block (313) which is arranged in the middle of the second connecting, The first magnet (320) and the second magnet (321) are respectively and fixedly arranged on the first adjusting block and the second adjusting block, the third magnet (322) and the fourth magnet (323) are respectively and fixedly arranged on the inner wall of the hollow square tube and are respectively used for matching the first magnet and the second magnet, the plurality of first grooves are arranged on the end face of the third magnet, and the plurality of second grooves are arranged on the end face of the fourth magnet.

3. A non-return valve for roof fan to facilitate fixing according to claim 1 or 2, wherein: the sealing device (3) also comprises a plurality of turning plates (326) which are arranged on one long side of the eccentric blade and can be turned upwards, a plurality of arc-shaped guide rails (327) which penetrate through the turning plates and are fixedly arranged on the eccentric blade, a third spring (328) with one end fixedly arranged on the eccentric blade and the other end fixedly arranged on the turning plates and sleeved on the arc-shaped guide rails, a plurality of rollers (329) which are positioned at the two ends of the turning plates and are rotatably arranged on the inner wall of the hollow square tube, a plurality of eccentric air deflectors (330) which are positioned above the eccentric blade and are rotatably arranged on the inner wall of the hollow square tube, a limiting groove (331) which is arranged on one side of the eccentric air deflectors and is arranged on the inner wall of the hollow square tube, a limiting rod (332) which is fixedly arranged on one side of the eccentric air deflectors and is arranged in the limiting groove, a plurality of special, the first special-shaped plate and the second special-shaped plate are identical in structure, and the first special-shaped plate (333) comprises a first arc-shaped section (335), a second arc-shaped section (336) and a vertical section (337).

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