Check valve

Abstract

The utility model provides a check valve which further comprises a rotating direction locking structure which is arranged between a valve seat breather pipe and a valve body and used for installing the valve body on the valve seat breather pipe in a locking mode, and when the valve body is installed on the valve seat breather pipe in the locking mode through the rotating direction locking structure, a valve block which is arranged in an inclined mode turns down under the action of self gravity. The smoke channel tends to be closed; the rotating direction locking structure comprises a thread structure which is arranged on the outer wall face of the pipe body and composed of two protruding teeth arranged at intervals in the axial direction, and a tooth groove which is formed in the inner wall face of the breather pipe and matched with the thread structure in a one-way screwing mode. One-way screwing matching of a thread structure and a tooth groove is adopted as an installation locking mode of the valve body and the valve seat, the situation that the valve body and the valve seat are separated due to the fact that the valve body and the valve seat are influenced by the gravity of the smoke outlet pipe in the use process can be avoided, use safety of the check valve is guaranteed, meanwhile, installation convenience of the check valve is improved, and the service life of the check valve is prolonged. And the installation efficiency is greatly improved.

Description

Technical Field

[0001] The utility model relates to a check valve. Background Art

[0002] In kitchens that use a common flue, a device such as a flue check valve is generally provided between the exhaust pipe of the range hood and the common flue to prevent the fumes in the flue from flowing back into the kitchen.

[0003] Flue check valve in related technology, such as Figure 6 As shown, it comprises a valve seat 10 mounted on the wall and a valve body 20 which is interference fit in the valve seat 10. A smoke passage is formed from the valve body 20 to the valve seat 10. The smoke passage has a smoke inlet and a smoke outlet relative to each other. The smoke inlet is connected to the smoke outlet pipe of the range hood in the kitchen. The smoke is discharged from the smoke outlet through the check valve to the outside. A valve plate 22 which can be opened and closed is arranged in the valve body 20. The valve plate 22 is rotatably mounted on the inner wall of the valve body 20 through a horizontally arranged valve plate 22 rotating shaft. The valve plate 22 is obliquely arranged on the inner wall of the valve body 20. When the range hood is not in use, the valve plate 22 is in a closed position due to its own gravity, closing the smoke passage; when the range hood is in use, the valve plate 22 is in an open position, opening the smoke passage.

[0004] The use of the above flue check valve has the following problems: since the valve body 20 and the valve seat 10 of the above check valve are interference-fitted together, the valve body 20 and the valve seat 10 are deformed due to the gravity of the smoke outlet pipe during use, affecting the overall structural firmness, resulting in inconvenience in disassembly and assembly, which in turn affects use. Utility Model Content

[0005] The utility model provides a check valve which can effectively solve the above problems.

[0006] The utility model is achieved in this way:

[0007] A check valve comprises a coaxially arranged valve seat with a vent pipe, a valve body detachably connected to the valve seat vent pipe, and a reducer assembly arranged at the end of the valve body away from the wall, the vent pipe from the valve body to the valve seat forms a smoke passage; the valve body comprises a hollow structure pipe and a valve plate hingedly matched to the inner wall surface of the pipe body to open and close the smoke passage, the valve plate located on the inner wall surface of the pipe body is inclined; further comprising a rotational locking structure arranged between the valve seat vent pipe and the valve body, for locking the valve body to the valve seat vent pipe, when the rotational locking structure locks the valve body to the valve seat vent pipe, the inclined valve plate has a tendency to flip down under the action of its own gravity to close the smoke passage;

[0008] The rotational locking structure includes a screw thread structure arranged on the outer wall of the tube body and composed of two axially spaced convex teeth, and a tooth groove arranged on the inner wall of the ventilation pipe and unidirectionally screwed with the screw thread structure. The end face of the ventilation pipe is provided with a connecting groove connected to the tooth groove, and the screw thread structure on the tube body is inserted into the connecting groove and positioned relative to the tooth groove.

[0009] As a further improvement, a positioning ring is provided on the outer wall of the tube body. When the tube body is inserted into the ventilation pipe until the positioning ring contacts the end of the ventilation pipe, the screw thread structure on the tube body and the tooth groove on the inner wall of the ventilation pipe are relatively positioned.

[0010] As a further improvement, two screw thread structures are provided on the outer wall of the tube body, and the two screw thread structures are symmetrically arranged along the radial direction of the tube body. Two tooth grooves are also provided on the inner wall of the ventilation pipe, and the two tooth grooves are symmetrically arranged along the radial direction of the ventilation pipe.

[0011] As a further improvement, a protrusion on the inner wall of the tube body is provided with a ring edge for holding the valve plate to seal and close the smoke channel. The inner wall of the tube body is provided with a dividing strip extending radially along the tube body and located in the middle of the ring edge. The valve body has two valve plates, which are hinged to the back of the dividing strip through an axis.

[0012] As a further improvement, a pair of coil springs are installed on the dividing strip to apply force to the valve plates to press the valve plates against the convex edge end surface to seal the smoke channel. One force-bearing end of the coil spring is fixedly connected to the back of one valve plate, and the other force-bearing end is fixedly connected to the other valve plate.

[0013] As a further improvement, the valve seat also includes a flange seat integrally formed at the end of the vent pipe, the four corners of the flange seat have through holes for screw through-hole connection, and the four edges of the flange seat are integrally formed with reinforcement sections for applying glass glue.

[0014] As a further improvement, the reducing assembly includes a first pipe connector that is interference fit on the pipe end of the pipe body facing away from the wall and a second pipe connector that is interference fit on the end of the first pipe connector. The outer diameter of the first pipe connector is larger than the inner diameter of the valve body, and the outer diameter of the second pipe connector is smaller than the inner diameter of the valve body.

[0015] The beneficial effects of the utility model are:

[0016] The present application adopts a one-way screwing combination of a screw thread structure and a tooth groove as a method of installing and locking the valve body and the valve seat, which can prevent the valve body and the valve seat from being separated due to the influence of the gravity of the smoke outlet pipe during use, thereby ensuring the safe use of the check valve, and also improving the convenience of the installation of the check valve, greatly improving the installation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0018] Figure 2 It is an exploded schematic diagram of the utility model showing the assembly relationship between the coil spring and the two valve plates;

[0019] Figure 3 It is the front view and the rear view of the check valve of the utility model;

[0020] Figure 4 This utility model Figure 3 Sectional view at AA in the middle;

[0021] Figure 5 This utility model Figure 3 The enlarged schematic diagram of point A in the middle;

[0022] Figure 6 It is a structural diagram of the related technology.

[0023] The accompanying drawings are marked as follows:

[0024] 10. valve seat; 11. vent pipe; 12. flange seat; 121. reinforcement section; 122. through hole;

[0025] 20. Valve body; 21. Tube body; 22. Valve plate; 23. Ring edge; 24. Separator strip; 25. Coil spring; 26. Positioning ring;

[0026] 30. Reducer assembly; 31. First pipe connector; 32. Second pipe connector;

[0027] 40. Rotational locking structure; 41. Screw thread structure; 411. Protruding teeth; 42. Tooth grooves; 43. Connecting grooves. DETAILED DESCRIPTION

[0028] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0029] like Figure 1 to Figure 4 As shown, a check valve is provided, and smoke can only pass through the check valve in one direction; it comprises a coaxially arranged valve seat 10 with a vent pipe 11, a valve body 20 detachably connected to the vent pipe 11 of the valve seat 10, and a reducer assembly 30 arranged at the end of the valve body 20 away from the wall side, and the vent pipe 11 from the valve body 20 to the valve seat 10 forms a smoke passage; the valve body 20 comprises a hollow structure pipe body 21 and a hinged inner wall surface of the pipe body 21 to open and close the smoke passage. The valve plate 22, which is located on the inner wall of the tube body 21, is arranged at an angle; it also includes a rotational locking structure 40 arranged between the valve seat 10 ventilation pipe 11 and the valve body 20, and is used to lock the valve body 20 and install it on the ventilation pipe 11 of the valve seat 10. When the rotational locking structure 40 locks the valve body 20 and installs it on the ventilation pipe 11 of the valve seat 10, the tilted valve plate 22 has a tendency to fall downward under the action of its own gravity to close the smoke channel.

[0030] The structures of the various components of the utility model are described below.

[0031] like Figure 1-2 As shown, the rotational locking structure 40 includes a screw structure 41 arranged on the outer wall of the tube body 21 and composed of two axially spaced convex teeth 411, and a tooth groove 42 arranged on the inner wall of the ventilation pipe 11 and unidirectionally screwed with the screw structure 41. The end face of the tube end of the ventilation pipe 11 is provided with a connecting groove 43 connected with the tooth groove 42. The screw structure 41 on the tube body 21 is inserted into the connecting groove 43 and aligned with the tooth groove 42. When the screw structure 41 is tightened in the tooth groove 42, the convex teeth 411 and the tooth groove 42 are pressed against the groove wall on the side of the connecting groove 43 away from the tooth groove 42, and the valve plate 22 in the valve body 20 has a tendency to fall downward under the action of its own gravity to close the smoke channel. It should be noted here that the valve body 20 is installed in the embodiment by means of the tube body 21 being internally rotated and installed in the vent pipe 11 of the valve seat 10. In other embodiments, the valve body 20 can also be installed in the vent pipe 11 by means of the tube body 21 being externally rotated and installed in the valve seat 10. It is only necessary to adaptively adjust the setting positions of the screw thread structure 41 and the tooth groove 42 accordingly.

[0032] The one-way screwing cooperation of the screw thread structure 41 and the tooth groove 42 is used as the installation locking method of the valve body 20 and the valve seat 10. This can prevent the valve body 20 and the valve seat 10 from being separated due to the gravity of the smoke outlet pipe during use, thereby ensuring the safe use of the check valve, while also improving the convenience of the check valve installation and greatly improving the installation efficiency.

[0033] like Figure 1-2 As shown, a positioning ring 26 is provided on the outer wall of the tube body 21. When the tube body 21 is inserted into the vent pipe 11 until the positioning ring 26 contacts the end of the vent pipe 11, the screw thread structure 41 on the tube body 21 and the tooth groove 42 on the inner wall of the vent pipe 11 are aligned. The screw thread structure 41 on the tube body 21 is aligned with the connecting groove 43 on the inner wall of the vent pipe 11 and inserted, so that the screw thread structure 41 enters the connecting groove 43 and the convex teeth 411 and the tooth groove 42 are in an aligned position. At this time, the tube body 21 is rotated clockwise so that the convex teeth 411 and the tooth groove 42 contact the groove wall on the side away from the connecting groove 43, and the locking installation of the valve body 20 is completed.

[0034] In this embodiment, Figure 1-2 As shown, preferably, two screw structures 41 are provided on the outer wall of the tube body 21 , and the two screw structures 41 are arranged radially symmetrically along the tube body 21 . Accordingly, two tooth grooves 42 are also provided on the inner wall of the ventilation pipe 11 , and the two tooth grooves 42 are arranged radially symmetrically along the ventilation pipe 11 .

[0035] like Figure 1 to Figure 3As shown, the inner wall surface of the tube body 21 is provided with a protruding ring edge 23 for holding the valve plate 22 to seal and close the smoke passage, and the inner wall surface of the tube body 21 is provided with a dividing strip 24 extending radially along the tube body 21 and located in the middle of the ring edge 23. The valve plates 22 of the valve body 20 are two and the two valve plates 22 are semicircular, and the two valve plates 22 are hingedly connected to the back of the dividing strip 24 through an axis. It should be noted here that the dividing strip 24 faces the smoke inflow end as the front side, and faces the smoke outflow end as the back side.

[0036] like Figure 2 to Figure 4 As shown, a pair of coil springs 25 are installed on the partition bar 24 to apply force to the valve plate 22 so that the valve plate 22 presses against the end surface of the convex edge to seal and close the smoke channel. One force-bearing end of the coil spring 25 is fixedly connected to the back of one valve plate 22, and the other force-bearing end is fixedly connected to the other valve plate 22. It is worth noting that when smoke passes through the smoke channel, the smoke can overcome the elastic force of the coil spring 25 and actuate the valve plate 22 to flip inward to open the smoke channel. After the smoke flows out, under the elastic force of the coil spring 25 and the gravity of the valve plate 22, the valve plate 22 can quickly flip down to close the smoke channel.

[0037] The check valve in the related art is sealed and installed by applying glass glue on the back of the valve seat 10. However, due to the limited area on the back of the valve seat 10 where glue can be applied, the sealing effect is poor, which is not conducive to the long-term sealing use of the check valve.

[0038] To solve the above problems, Figure 3 and Figure 5 As shown, the valve seat 10 also includes a flange seat 12 integrally formed at the end of the vent pipe 11, and the four corners of the flange seat 12 are provided with through holes 121 for screws (not shown in the figure) to connect through the holes, and the four edges of the flange seat 12 are integrally formed with reinforcement sections 121 for applying glass glue. By widening and adding the reinforcement section 121 on the valve seat 10, the area on the back of the valve seat 10 that can be applied with glass glue is increased, which has the effect of improving the installation sealing of the check valve and is more conducive to the long-term sealing use of the check valve.

[0039] like Figure 1-2 As shown, the reducing assembly 30 includes a first pipe connector 31 which is interferingly buckled at the pipe end of the pipe body 21 away from the wall, and a second pipe connector 32 which is interferingly buckled at the end of the first pipe connector 31. The outer diameter of the pipe connecting end of the first pipe connector 31 is larger than the inner diameter of the pipe connecting end of the pipe body 21, and the outer diameter of the pipe connecting end of the second pipe connector 32 is smaller than the inner diameter of the pipe connecting end of the pipe body 21. This makes it easy to connect with pipes of different diameters, can match the installation and use of pipes of different specifications, and improves the application range of the check valve.

[0040] The above embodiments are only used to illustrate the present invention, not to limit the present invention. A person skilled in the art may make various changes or modifications without departing from the spirit and scope of the present invention. Therefore, all equivalent technical solutions should also fall within the scope of the present invention and be defined by the claims.

Claims

1. A check valve, comprising a coaxially arranged valve seat (10) having a vent pipe (11), a valve body (20) detachably connected to the valve seat (10) and the vent pipe (11), and a reducing assembly (30) arranged at the end of the valve body (20) away from the wall, the vent pipe (11) from the valve body (20) to the valve seat (10) forms a smoke passage; the valve body (20) comprises a hollow structure pipe (21) and a valve plate (22) hingedly matched to the inner wall surface of the pipe body (21) to open and close the smoke passage, the valve plate (22) located on the inner wall surface of the pipe body (21) being arranged in an inclined manner; characterized in that: It also includes a rotational locking structure (40) disposed between the valve seat (10) ventilation pipe (11) and the valve body (20) and used for locking the valve body (20) on the valve seat (10) ventilation pipe (11); when the rotational locking structure (40) locks the valve body (20) on the valve seat (10) ventilation pipe (11), the inclined valve plate (22) has a tendency to fall downward under the action of its own gravity to close the smoke passage; The rotational locking structure (40) comprises a screw thread structure (41) arranged on the outer wall surface of the tube body (21) and composed of two convex teeth (411) arranged axially at intervals, and a tooth groove (42) arranged on the inner wall surface of the ventilation pipe (11) and unidirectionally screwed with the screw thread structure (41); a connecting groove (43) communicating with the tooth groove (42) is formed on the end surface of the tube end of the ventilation pipe (11); the screw thread structure (41) on the tube body (21) is inserted into the connecting groove (43) and is positioned relative to the tooth groove (42).

2. A check valve according to claim 1, characterized in that: A positioning ring (26) is provided on the outer wall surface of the tube body (21). When the tube body (21) is inserted into the ventilation pipe (11) until the positioning ring (26) contacts the end of the ventilation pipe (11), the screw thread structure (41) on the tube body (21) and the tooth groove (42) on the inner wall of the ventilation pipe (11) are relatively positioned.

3. A check valve according to claim 1, characterized in that: The number of screw thread structures (41) on the outer wall surface of the tube body (21) is two, and the two screw thread structures (41) are symmetrically arranged along the radial direction of the tube body (21). The number of tooth grooves (42) on the inner wall surface of the ventilation pipe (11) is also two, and the two tooth grooves (42) are symmetrically arranged along the radial direction of the ventilation pipe (11).

4. A check valve according to claim 1, characterized in that: The inner wall surface of the tube body (21) is provided with a protruding annular edge (23) for holding the valve plate (22) to seal and close the smoke passage. The inner wall surface of the tube body (21) is provided with a dividing strip (24) extending radially along the tube body (21) and located in the middle of the annular edge (23). The valve body (20) has two valve plates (22), and the two valve plates (22) are hingedly connected to the back of the dividing strip (24) via an axis.

5. A check valve according to claim 4, characterized in that: A pair of valve plates (22) are installed on the partition bar (24) to apply force to the valve plates (22) to press against the convex edge end surface to seal the smoke passage; one force-bearing end of the coil spring (25) is fixedly connected to the back side of one valve plate (22), and the other force-bearing end is fixedly connected to the other valve plate (22).

6. A check valve according to claim 1, characterized in that: The valve seat (10) further comprises a flange seat (12) integrally formed at the end of the vent pipe (11), the flange seat (12) having through holes (122) for screw through-hole connection at four corners, and reinforcing sections (121) for applying glass glue integrally formed around the four edges of the flange seat (12).

7. A check valve according to claim 1, characterized in that: The diameter-changing assembly (30) comprises a first pipe connector (31) which is interferingly buckled at the pipe end of the pipe body (21) facing away from the wall, and a second pipe connector (32) which is interferingly buckled at the end of the first pipe connector (31), wherein the outer diameter of the pipe connecting end of the first pipe connector (31) is greater than the inner diameter of the pipe connecting end of the pipe body (21), and the outer diameter of the pipe connecting end of the second pipe connector (32) is smaller than the inner diameter of the pipe connecting end of the pipe body (21).

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