Inclined clack type check valve

Abstract

An inclined clack type check valve comprises a valve body, a pin shaft, sealing packing, a packing pressing ring and an end cover, a pin shaft hole is formed in the valve body, a hole step is arranged on the side wall of the end, close to the inner side of the valve body, of the pin shaft hole, a shaft step is arranged on the pin shaft, the shaft step abuts against the hole step, the space between the pin shaft and the pin shaft hole is filled with the sealing packing, and the packing pressing ring is arranged on the end cover. The packing pressing ring abuts against the sealing packing and protrudes out of the outer surface of the valve body and the end of the pin shaft, the end cover abuts against the packing pressing ring, gaps are formed between the end cover and the outer surface of the valve body and between the end cover and the end of the pin shaft, the end cover is connected to the outer surface of the valve body through a bolt, a threaded hole is formed in the end cover, and a threaded rod is in threaded connection with the interior of the threaded hole. And the end part of the screw rod is propped against the end part of the pin shaft. According to the utility model, the screw rod is propped against the end part of the pin shaft, so that the pin shaft is clamped between the hole step and the screw rod, and the deformation and failure of the sealing filler caused by the fact that the pin shaft moves in the pressing direction of the sealing filler and extrudes the sealing filler are avoided.

Description

Technical Field

[0001] The utility model belongs to the technical field of inclined flap type check valves, in particular to an inclined flap type check valve. Background Art

[0002] As a commonly used check valve in the industry, the inclined disc check valve, as shown in FIG. 2 , most existing structures adopt the following method: a pin shaft hole is drilled on the valve body 100, the pin shaft 200 is fixed to the valve body 100 through the end cover 300 and bolts, and a gasket or a sealing ring 400 is used to seal between the end cover 300 and the valve body 100.

[0003] In the existing structure, the pin 200 is fixed by the end cover 300, and the gasket or sealing ring 400 between the end cover 300 and the valve body 100 is made of elastic material. When the valve is running, the pin 200 will have a slight movement in the force direction of the gasket or sealing ring 400, and long-term movement will accelerate the failure of the gasket or sealing ring 400. The gasket or sealing ring 400 is used for sealing, and the sealing method is single. If the sealing fails during use, it cannot be adjusted, and the gasket or sealing ring 400 can only be replaced by stopping the machine, which delays the operation of the pipeline and causes certain losses to the factory production. Utility Model Content

[0004] In view of the problems existing in the prior art, the utility model aims to provide a tilted flap check valve.

[0005] In order to solve the above problems, the utility model adopts the following technical solutions: a tilted flap check valve, comprising a valve body, a pin shaft, a sealing packing, a packing pressing ring and an end cover, the valve body is provided with a pin shaft hole penetrating the valve body, the pin shaft is rotatably connected in the pin shaft hole, a hole step is provided on the side wall of one end of the pin shaft hole close to the inner side of the valve body, the pin shaft is provided with an axis step with a diameter larger than the diameter of the pin shaft, one side of the axis step abuts on the hole step, the sealing packing is filled between the pin shaft and the pin shaft hole on the other side of the axis step, the packing pressing ring is sleeved between the pin shaft and the pin shaft hole and can slide along the axial direction of the pin shaft, one side of the packing pressing ring abuts on the sealing packing and the other side thereof protrudes from the outer surface of the valve body and the end of the pin shaft, one side of the end cover abuts on the other side of the packing pressing ring and there is a gap between the end cover and the outer surface of the valve body and the end of the pin shaft, the end cover is connected to the outer surface of the valve body by bolts, a threaded hole is provided on the end cover, a screw is threadedly connected in the threaded hole, and the end of the screw abuts on the end of the pin shaft.

[0006] Preferably, the screw rod is a set screw.

[0007] Preferably, a gap is left between the end cover and the outer surface of the valve body and the end of the pin shaft when the sealing packing is compressed.

[0008] Preferably, the sealing filler is a multi-ring sealing filler.

[0009] Compared with the prior art, the advantages of the present invention are:

[0010] When the utility model is in use, the bolts are tightened to adjust the end cover close to the valve body, the end cover squeezes the packing pressure ring, the sealing packing and the shaft step of the pin shaft, one side of the shaft step is pressed tightly against the hole step, the sealing packing is pressed and tightly filled between the pin shaft and the pin shaft hole to achieve sealing, and then the screw on the end cover is tightened to make the screw tight against the end of the pin shaft, so that the pin shaft is clamped between the hole step and the screw, thereby avoiding the pin shaft from moving in the sealing packing compression direction to squeeze the sealing packing and causing the sealing packing to deform and fail. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] FIG1 is a schematic diagram of the structure of the utility model;

[0012] FIG2 is a schematic diagram of the structure of the prior art. DETAILED DESCRIPTION

[0013] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0014] In the description of the present invention, it should be noted that the terms "upper / lower end", "inner", "outer", "front end", "rear end", "two ends", "one end", "the other end" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0015] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "setting / sleeving", "sleeve connection", "connection", etc. should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0016] Please refer to Figure 1. The utility model provides a technical solution: a tilted flap check valve, including a valve body 1, a pin shaft 2, a sealing packing 3, a packing pressing ring 4 and an end cover 5. The valve body 1 is provided with a pin shaft hole 11 that passes through the valve body 1. The pin shaft 2 is rotatably connected in the pin shaft hole 11. A hole step 12 is provided on the side wall of the pin shaft hole 11 at one end close to the inner side of the valve body 1. The pin shaft 2 is provided with a shaft step 21 with a diameter larger than the diameter of the pin shaft 2. One side of the shaft step 21 abuts on the hole step 12. The sealing packing 3 is filled between the pin shaft 2 and the pin shaft hole 11 on the other side of the shaft step 21. The packing pressing ring 4 is sleeved between the pin shaft 2 and the pin shaft hole 11 and can slide along the axial direction of the pin shaft 2. One side of the packing pressing ring 4 abuts on the sealing packing 3 and the other side thereof protrudes from the outer surface of the valve body 1 and the end of the pin shaft 2. The end cover 5 One side abuts against the other side of the packing ring 4 and there is a gap between the end cover 5 and the outer surface of the valve body 1 and the end of the pin 2. The end cover 5 is connected to the outer surface of the valve body 1 by bolts. A threaded hole 51 is opened on the end cover 5. A screw 6 is connected to the inner thread of the threaded hole 51. The end of the screw 6 abuts against the end of the pin 2.

[0017] When the utility model is in use, the bolts are tightened to adjust the end cover 5 close to the valve body 1, the end cover 5 squeezes the packing press ring 4, the sealing packing 3 and the shaft step 21 of the pin shaft 2, one side of the shaft step 21 is pressed tightly against the hole step 12, the sealing packing 3 is pressed and tightly filled between the pin shaft 2 and the pin shaft hole 11 to achieve sealing, and then the screw 6 on the end cover 5 is tightened to make the screw 6 press against the end of the pin shaft 2, so that the pin shaft 2 is clamped between the hole step 12 and the screw 6, thereby preventing the pin shaft 2 from moving in the compression direction of the sealing packing 3 to squeeze the sealing packing 3 and cause the sealing packing 3 to deform and fail.

[0018] Furthermore, the screw rod 6 is a set screw, and its end is hidden in the surface of the end cover 5, which is more beautiful.

[0019] Furthermore, a gap is left between the end cover 5 and the outer surface of the valve body 1 and the end of the pin shaft 2 when the sealing packing 3 is compressed, leaving room for pre-tightening of the sealing packing 3 after it is loosened. After the sealing of the sealing packing 3 fails, the end cover 5 can be tightened by bolts to squeeze the packing pressing ring 4 and readjust the seal, avoiding the trouble of disassembling and re-maintaining the valve.

[0020] Furthermore, the sealing packing 3 is a multi-turn sealing packing. After the sealing packing 3 fails to seal, the number of turns of the sealing packing can be increased. The multi-turn sealing packing structure greatly reduces the failure probability.

[0021] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions. The sentence "includes an element defined by ... does not exclude the existence of other identical elements in the process, method, article or device including the element".

[0022] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A tilted flap check valve, characterized in that: The valve body (1) comprises a valve body (1), a pin shaft (2), a sealing packing (3), a packing pressing ring (4) and an end cover (5), wherein the valve body (1) is provided with a pin shaft hole (11) penetrating the valve body (1), the pin shaft (2) is rotatably connected in the pin shaft hole (11), a hole step (12) is provided on a side wall of one end of the pin shaft hole (11) close to the inner side of the valve body (1), the pin shaft (2) is provided with a shaft step (21) having a diameter larger than that of the pin shaft (2), one side of the shaft step (21) abuts against the hole step (12), the sealing packing (3) is filled between the pin shaft (2) and the pin shaft hole (11) on the other side of the shaft step (21), and the filling is provided on the side wall of the pin shaft (11) to prevent the pin shaft (2) from being damaged. The packing pressure ring (4) is sleeved between the pin shaft (2) and the pin shaft hole (11) and can slide along the axial direction of the pin shaft (2); one side of the packing pressure ring (4) abuts against the sealing packing (3) and the other side thereof protrudes from the outer surface of the valve body (1) and the end of the pin shaft (2); one side of the end cover (5) abuts against the other side of the packing pressure ring (4) and there is a gap between the end cover (5) and the outer surface of the valve body (1) and the end of the pin shaft (2); the end cover (5) is connected to the outer surface of the valve body (1) by bolts; a threaded hole (51) is provided on the end cover (5); a screw rod (6) is threadedly connected to the inner thread of the threaded hole (51); and the end of the screw rod (6) abuts against the end of the pin shaft (2).

2. A tilted flap check valve according to claim 1, characterized in that: The screw rod (6) is a set screw.

3. The tilted flap check valve according to claim 1, characterized in that: A gap is left between the end cover (5), the outer surface of the valve body (1) and the end of the pin shaft (2) when the sealing packing (3) is compressed.

4. The tilted flap check valve according to claim 1, characterized in that: The sealing filler (3) is a multi-ring sealing filler.

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