CN220770222U - Return air prevention device - Google Patents

Abstract

The application relates to the technical field of check valves, discloses a return air prevention device, it includes connecting tube and flashboard, the flashboard articulated in the connecting tube, still include with connecting tube tip grafting complex reducing joint, reducing joint with connecting tube is linked together, reducing joint is to keeping away from connecting tube direction has water conservancy diversion section, first portion of cup jointing and the second portion of cup jointing that the external diameter reduces in proper order, just the water conservancy diversion section is to keeping away from connecting tube direction taper gradually, first portion of cup jointing is used for the air supply pipe cover with the second portion of cup jointing to establish. The application can strengthen the adaptation degree that the anti-return air device links to each other with the tuber pipe.

Description

Return air prevention device

Technical Field

The application relates to the technical field of check valves, in particular to a return air prevention device.

Background

In a kitchen, a toilet, or the like, which requires smoke evacuation and the like, an air return prevention device, also called a check valve, is often installed at an evacuation site so that the exhausted odorous gas is not likely to flow back into the room to cause odor return.

The existing check valve is generally provided with a connecting pipeline and a flashboard, one end of the air inlet of the connecting pipeline is communicated with an air pipe in an air inlet environment, one end of the air outlet of the connecting pipeline is communicated with an air outlet environment or an air pipe leading to the air outlet environment, the valve plate is hinged in the connecting pipeline, when the air inlet environment is in air inlet, air flows through the connecting pipeline to enter the air outlet environment, and when the air inlet pipeline stops in air inlet, the flashboard falls back to close the flashboard of the connecting pipeline under the action of self gravity so as to prevent the reverse flow of the air.

For the related technology, in the air inlet environment such as the air pipe of the range hood and the branch pipe of the fresh air system, the air pipe such as the public flue in the air outlet environment has different sizes according to the selection of different brand specifications, and the air pipe is connected with the air pipe through the connecting pipeline to cause the inadequacy of the adaptability between the air return preventing device and the air pipes with different sizes.

Disclosure of Invention

In order to strengthen the degree of adaptation that return air prevention device links to each other with the tuber pipe, this application provides a return air prevention device.

The application provides a prevent return air device adopts following technical scheme:

the utility model provides a return air prevention device, includes connecting tube and flashboard, the flashboard articulated in the connecting tube, still include with connecting tube tip grafting complex reducing joint, reducing joint with connecting tube is linked together, reducing joint is to keeping away from the connecting tube direction has water conservancy diversion section, first portion of cup jointing and the second portion of cup jointing that the external diameter reduces in proper order, just the water conservancy diversion section is to keeping away from connecting tube direction shrink gradually, first portion of cup jointing is used for supplying the tuber pipe cover with the second portion of cup jointing to establish.

Through adopting above-mentioned technical scheme, through establish the bellows cover to first portion of cup jointing or second portion of cup jointing, then make the reducing joint can adapt to the tuber pipe of different bore to the adaptation degree that strong return air prevention device links to each other with the tuber pipe, and the air current that the diversion section was directed in to getting into the reducing joint makes the air current more smooth and easy with the flow between connecting tube and reducing, so that the difficult accumulation of gas is in connecting tube.

Optionally, the reducing joint comprises a first joint and a second joint, the first joint is in plug connection with the connecting pipeline, the diversion section and the first sleeve joint part are positioned on the first joint, the second sleeve joint part is positioned on the second joint, and the second joint is in plug connection with the first joint and away from one end of the connecting pipeline.

Through adopting above-mentioned technical scheme, first joint and second connect through grafting cooperation can dismantle the connection for can dismantle the second joint in advance when the bellows cover is established to first joint, with the reduction consumptive material, and improve the degree of convenience of installation tuber pipe.

Optionally, the first sleeve joint portion with the water conservancy diversion section links to each other, first joint still have connect in the water conservancy diversion section deviates from the grafting portion on the first sleeve joint portion one end, grafting portion is used for pegging graft to in the connecting tube tip.

Through adopting above-mentioned technical scheme, when first portion of cup jointing links to each other with the water conservancy diversion section and makes the bellows cover establish to first portion of cup jointing, can remove the tuber pipe mouth to support tightly in the water conservancy diversion section outer wall through the reducing of water conservancy diversion section to seal the tuber pipe mouth, thereby reduce the possibility of gas leakage.

Optionally, the connection part of grafting portion with the water conservancy diversion section has spacing arch, spacing arch is used for when grafting portion inserts the connecting tube is contradicted connecting tube tip.

By adopting the technical scheme, the limit protrusion limits the plugging distance of the plugging part so as to guide the installation of the first connector.

Optionally, the second connector includes a first split and a second split, the second sleeve joint part is located on the second split, and the second split further has a matching part in plug-in matching with the first split; the first split body is used for being inserted into the first joint, a first slot for being inserted into the matching part or the air pipe is formed in the first split body, and the first slot is arranged along the circumferential direction of the first split body.

Through adopting above-mentioned technical scheme, when first components of a whole that can function independently and second components of a whole that can function independently are separated, the tuber pipe can insert in the first slot, and when first components of a whole that can function independently link to each other with the second components of a whole that can function independently, the tuber pipe can overlap to establish on the second cup joints portion to further strengthen the adaptability of reducing joint to the tuber pipe.

Optionally, an abutment edge is provided on the outer wall of the first split body, and the abutment edge is used for abutting against the end part of the first joint when the first split body is plugged onto the first joint.

By adopting the technical scheme, when the abutting edge enables the first split to be inserted on the first connector to a certain position, the first split cannot continue to move forwards, so that the installation of the first split is guided.

Optionally, the first split is inserted into the first sleeve joint portion, and the extension length of the first split is smaller than or equal to the extension length of the first sleeve joint portion.

Through adopting above-mentioned technical scheme, when the air current is from first joint flow direction second joint, first components of a whole that can function independently length is less than first socket joint portion length and can make the smooth and easy entering first components of a whole that can function independently of air current, and be difficult for detaining in first joint.

Optionally, the second connector forms a second slot along the second connector circumference at one end of the second sleeve joint part, which is away from the first connector, and the second slot is used for the air pipe to insert.

By adopting the technical scheme, the arrangement of the second slot further increases the adaptability of the reducer union to the air pipe.

In summary, the present application includes at least one of the following beneficial effects:

1. the reducing joint can be sleeved with air pipes with different calibers through the arrangement of the first sleeving part and the second sleeving part, so that the adaptation degree of the air return prevention device connected with the air pipes is enhanced;

2. the first connector and the second connector can be connected or separated through plug-in fit, so that the flexibility of the reducer union is improved.

Drawings

FIG. 1 is a schematic view of a structure of an anti-return air device according to an embodiment of the present application;

FIG. 2 is a schematic view of an alternative angle of the anti-return air device according to the embodiment of the present application;

fig. 3 is a schematic view of a blast structure of a reducing joint in an embodiment of the present application.

Reference numerals illustrate: 1. a connecting pipe; 2. a flashboard; 3. a reducing joint; 31. a first joint; 32. a second joint; 321. a first split; 322. a second split; 4. a diversion section; 5. a first socket part; 6. a second socket joint part; 7. a plug-in part; 8. a limit protrusion; 9. a mating portion; 10. a first slot; 11. an abutment edge; 12. a second slot; 13. and a connecting ring.

Detailed Description

The present application is described in further detail below in conjunction with figures 1-3.

The embodiment of the application discloses an anti-return air device. Referring to fig. 1, the return air prevention device includes a connection pipe 1, a shutter 2, and a reducer union 3, wherein the connection pipe 1 is in a cylindrical shape with two ends penetrating, and the shutter 2 is hinged in the connection pipe 1 to open and close the connection pipe 1. And in order to enable the flashboard 2 to automatically fall back from one end of the air outlet to one end close to the air inlet after installation, the air bubble level is fixedly installed outside the connecting pipeline 1 so as to indicate the installation position of the connecting pipeline 1.

The reducer union 3 is clamped at the end part of the connecting pipeline 1 and is used for connecting air pipes with different calibers, and the inside of the reducer union 3 is hollow so that the air pipes are communicated with the connecting pipeline 1. The connecting pipe 1 can be clamped into the reducer union 3 at any one end or clamped into the reducer union 3 at the opposite ends according to the position and the size of the air pipe. The reducer union 3 may be made of plastic, stainless steel or other materials with certain hardness.

Referring to fig. 1 and 2, the reducer union 3 includes a first union 31 and a second union 32, the first union 31 is coaxially inserted and fitted with the second union 32, and the first union 31 is coaxially inserted and fitted with the end of the connecting pipe 1. The first joint 31 has a first sleeving part 5, the second joint 32 has a second sleeving part 6, the first sleeving part 5 and the second sleeving part 6 are all in ring shape for sleeving the air supply pipe, and the outer diameter of the first sleeving part 5 is larger than that of the second sleeving part 6.

When the first joint 31, the second joint 32 and the connecting pipeline 1 are in plug-in fit in sequence, the first sleeve joint part 5 is positioned between the connecting pipeline 1 and the second sleeve joint part 6, so that the reducing joint 3 can be connected with air pipes with calibers adapted to the outer diameters of the first sleeve joint part 5 and the second sleeve joint part 6. When the reducer union 3 is connected with the air pipe with the caliber adapted to the outer diameter of the first sleeve joint part 5, the second union 32 can be firstly taken down from the first union 31 and then connected with the air pipe, so that the air flow area at the communication part of the reducer union 3 and the air pipe is enlarged, and the smoothness of the air flowing between the reducer union 3 and the air pipe is improved.

In addition, when only the first connector 31 is mounted on the connecting pipeline 1, the air pipe with the outer diameter matched with the inner diameter of the first sleeving part 5 can be plugged into the first sleeving part 5 for connection, and when both the first connector 31 and the second connector 32 are mounted on the connecting pipeline 1, the air pipe with the outer diameter matched with the inner diameter of the second sleeving part 6 can be plugged into the second sleeving part 6 for connection.

Referring to fig. 2 and 3, the first connector 31 is provided with a diversion section 4 and a plugging portion 7 at one end of the first sleeving portion 5 in sequence. The plugging portion 7 is used for being plugged into the connecting pipeline 1 so that the first joint 31 is matched with the connecting pipeline 1, and the plugging portion 7 is in a ring shape with the outer diameter consistent with the inner diameter of the connecting pipeline 1 and larger than the outer diameter of the first sleeving portion 5. The guide section 4 is cone-shaped and integrally formed between the first sleeve joint part 5 and the plug joint part 7, and the guide section 4 and the plug joint part 7 are coaxially arranged, so that the outer diameter of the guide section 4 gradually decreases from the plug joint part 7 to the direction close to the first sleeve joint part 5.

Therefore, when the reducer union 3 is installed at one end of the air outlet of the connecting pipeline 1, the air flow in the connecting pipeline 1 can be gradually gathered and guided to the first sleeving part 5 by the diversion section 4, the air flow is flushed into the air pipe from the first sleeving part 5, the resistance of the air flow flowing from the plugging part 7 to the first sleeving part 5 is smaller, impurities such as oil smoke dust in the air flow are not easy to be trapped in the connecting pipeline 1 and the reducer union 3, and the smoothness of the air flow is improved.

In order to improve the stability of the first connector 31, the joint of the plug-in part 7 and the diversion section 4 is integrally formed with a limit bulge 8, the limit bulge 8 protrudes out of the outer wall of the joint of the plug-in part 7 and the diversion section 4, and the limit bulge 8 extends for one circle along the circumferential direction of the plug-in part 7. When the plug-in part 7 is plugged into the connecting pipeline 1, the plug-in part can move to the end face of the limiting protrusion 8 which is abutted against the connecting pipeline 1 so as to limit the plug-in part 7.

The second connector 32 comprises a second split 322 and a first split 321, the first split 321 is in plug-in fit with the first connector 31, and the second split 322 is in plug-in fit with the first split 321.

Referring to fig. 3, specifically, the first split 321 is in a ring shape, and an outer diameter of the first split 321 is consistent with an inner diameter of the first socket 5, so as to be inserted into the first socket 5 to connect the second connector 32 with the first connector 31. The first slot 10 is formed on an end surface of one end of the first split 321, the first slot 10 is a circular ring groove coaxial with the first split 321, and the first slot 10 is used for being in plug-in fit with the second split 322. And when the second split 322 is separated from the first split 321, the air pipe with the caliber matched with the first slot 10 can be coaxially inserted into the first annular groove, so that the size of the air pipe matched with the reducer union 3 is increased. In addition, the extension length of the first split 321 along the self axis direction is less than or equal to the extension length of the first sleeve joint part 5 along the self axis direction, so that the air flow is not easy to stay and accumulate between the first split 321 and the guide section 4 when flowing into the first split 321 from the guide section 4.

The second sleeving part 6 is a part of the second split 322, the second split 322 further comprises a matching part 9, the matching part 9 is integrally formed at one end of the second sleeving part 6 and is in a ring shape coaxially arranged with the second sleeving part 6 and is used for being spliced into the first ring groove, so that the second split 322 is spliced and matched with the first split 321, and the outer diameter of the matching part 9 is larger than that of the second sleeving part 6.

Referring to fig. 2 and 3, and in order to improve the stability of the first connector 31 and the second connector 32 during plugging and coupling, the first split 321 protrudes outwards around the circumference of the first split 321 at the notch of the first slot 10, and when the second split 322 is plugged into the first sleeve joint 5 from the end of the first sleeve joint 5 away from the guide section 4, the second split 322 can move to the position where the abutting edge 11 abuts against the end surface of the first sleeve joint 5 away from the guide section 4, so as to specify the installation depth of the second connector 32, and limit the first connector 31 and the second connector 32 relatively.

Referring to fig. 2 and 3, further, the second split 322 further includes a connecting ring 13 integrally formed in the second sleeving part 6, the connecting ring 13 is in a ring shape, the outer diameter of the connecting ring 13 is smaller than the inner diameter of the second sleeving part 6, the bottom of the connecting ring 13 extends to be connected to the bottom of the second sleeving part 6, and the connecting ring 13 and the second sleeving part 6 are coaxially arranged, so that the connecting ring 13 and the second sleeving part 6 together form a second slot 12 with an opening deviating from one end of the mating part 9. The second slot 12 is in a circular ring groove shape arranged along the circumferential direction of the second sleeving part 6, the second slot 12 is used for inserting an air pipe with caliber matched with that of the second slot 12, and the inner diameter of the second slot 12 is different from that of the first slot 10. In addition, the air pipe with the outer diameter matched with the inner diameter of the connecting ring 13 can be inserted into the connecting ring 13, so that the adapting range of the reducer union 3 is further increased.

The implementation principle of the air return prevention device in the embodiment of the application is as follows: the first joint 31 is coaxially inserted into the end part of the connecting pipeline 1, the first split 321 is coaxially inserted into the first sleeve joint part 5, and then the matching section of the second split 322 is coaxially inserted into the first slot 10, namely, the complete reducer joint 3 is spliced. When the reducer union 3 is used, the reducer union 3 is installed at one end or two ends of the connecting pipeline 1 according to the arrangement of the air inlet environment and the air outlet environment, and the first joint 31 and the second joint 32 are disassembled and assembled according to the size of the air pipe which is required to be connected, so that the air pipe can be sleeved or clamped on the reducer union 3, and the connecting pipeline 1 and the air pipe are connected and communicated through the reducer union 3. After the reducer union 3 is connected with the air pipe, the aluminum foil tape is used for adhering the reducer union 3 with the air pipe, so that air leakage is prevented.

The foregoing are all preferred embodiments of the present application, and are not intended to limit the scope of the present application in any way, therefore: all equivalent changes in structure, shape and principle of this application should be covered in the protection scope of this application.

Claims (8)

1. The utility model provides a prevent return air device, includes connecting tube (1) and flashboard (2), flashboard (2) articulated in connecting tube (1), its characterized in that: still include with connecting tube (1) tip grafting complex reducing joint (3), reducing joint (3) with connecting tube (1) are linked together, reducing joint (3) are to keeping away from connecting tube (1) direction has water conservancy diversion section (4), first portion (5) and the second portion (6) that cup joints that cup joint of external diameter reduces in proper order, just water conservancy diversion section (4) are to keeping away from connecting tube (1) direction shrink gradually, first portion (5) and second portion (6) cup joint and are used for the air supply pipe cover to establish.

2. A return air prevention device according to claim 1, wherein: the reducer union (3) comprises a first joint (31) and a second joint (32), the first joint (31) is in plug connection with the connecting pipeline (1), the diversion section (4) and the first sleeve joint part (5) are positioned on the first joint (31), the second sleeve joint part (6) is positioned on the second joint (32), and the second joint (32) is in plug connection with the first joint (31) and is far away from one end of the connecting pipeline (1).

3. A return air prevention device according to claim 2, wherein: the first sleeve joint part (5) is connected with the diversion section (4), the first joint (31) is further provided with a plug part (7) connected to one end of the diversion section (4) deviating from the first sleeve joint part (5), and the plug part (7) is used for being plugged into the end part of the connecting pipeline (1).

4. A return air prevention apparatus according to claim 3, wherein: the connection part of the plug-in connection part (7) and the flow guiding section (4) is provided with a limiting protrusion (8), and the limiting protrusion (8) is used for abutting against the end part of the connecting pipeline (1) when the plug-in connection part (7) is inserted into the connecting pipeline (1).

5. A return air prevention apparatus according to any one of claims 2-4, wherein: the second connector (32) comprises a first split body (321) and a second split body (322), the second sleeving part (6) is positioned on the second split body (322), and the second split body (322) is also provided with a matching part (9) which is in plug-in matching with the first split body (321); the first split body (321) is used for being inserted into the first joint (31), a first slot (10) for the matching part (9) or the air pipe to be inserted is formed in the first split body (321), and the first slot (10) is circumferentially arranged along the first split body (321).

6. A return air prevention apparatus according to claim 5, wherein: the outer wall of the first split body (321) is provided with an abutting edge (11), and the abutting edge (11) is used for abutting against the end part of the first joint (31) when the first split body (321) is inserted onto the first joint (31).

7. A return air prevention apparatus according to claim 5, wherein: the first split body (321) is inserted into the first sleeving part (5), and the extension length of the first split body (321) is smaller than or equal to that of the first sleeving part (5).

8. A return air prevention apparatus according to any one of claims 2-4, wherein: the second connector (32) is arranged at one end of the second sleeving part (6) deviating from the first connector (31) to form a second slot (12) circumferentially arranged along the second connector (32), and the second slot (12) is used for inserting the air pipe.