Buffering lifting type check valve

Abstract

The utility model relates to the technical field of lifting check valves, in particular to a buffering lifting check valve which comprises a valve body, a valve cover is fixed at the top end of the valve body, a support is fixed at the bottom end of the valve cover, a valve clack and a check ring are arranged in the valve body, a valve rod is fixed at the top end of the valve clack, and connecting rods are fixed on two sides of the valve rod. Vertical rods are fixed to the top ends of the two connecting rods, the two vertical rods are sleeved with buffer springs, check blocks are fixed to the two sides of the support, limiting blocks are arranged on the two sides of the valve rod, air springs are fixed to the top ends of the two limiting blocks, a flow slowing plate is arranged on the side, away from the valve clack, of a check ring, and a plurality of conical flow slowing holes are formed in the flow slowing plate. The two buffer springs buffer the speed of the valve rod and the valve clack, the two connecting rods extrude the two air springs in the medium backflow and valve clack reset process, the conical flow slowing hole in the flow slowing plate can reduce the pressure brought by medium backflow, and then the speed of the valve rod and the valve clack is buffered.

Description

Technical Field

[0001] The utility model relates to the technical field of lift check valves, in particular to a buffer lift check valve. Background Art

[0002] A lift check valve is a valve that automatically opens and closes the valve disc by the flow of the medium itself to prevent the medium from flowing back. It is also called a non-return valve, a one-way valve, a reverse flow valve and a back pressure valve. The check valve is an automatic valve, and its main function is to prevent the medium from flowing back, to prevent the pump and the drive motor from reversing, and to prevent the medium from being released from the container. When the medium flow in the check valve is large, due to the fast flow rate and high instantaneous pressure of the medium, the medium quickly impacts the valve disc, and the valve disc and valve stem violently hit the valve body under the rapid impact of the medium, which is easy to damage the valve disc, valve stem and valve body, affecting the service life of the valve. Therefore, a buffer lift check valve is proposed to protect the valve disc, valve stem and valve body. Utility Model Content

[0003] In view of the problems in the prior art, the utility model provides a buffer lift check valve.

[0004] The technical solution adopted by the utility model to solve its technical problems is a buffer lift check valve, comprising a valve body, a valve cover is fixed on the top end of the valve body, a support is fixed on the bottom end of the valve cover, a valve disc and a retaining ring are arranged in the valve body, a valve stem is fixed on the top end of the valve disc, a slot adapted to the valve stem is arranged at the bottom end of the support, connecting rods are fixed on both sides of the valve stem, vertical rods are fixed on the top ends of the two connecting rods, buffer springs are sleeved on the two vertical rods, blocks are fixed on both sides of the support, through holes adapted to the vertical rods are opened on the two blocks, limit blocks are provided on both sides of the valve stem, the two limit blocks are connected to the valve body, air springs are fixed on the top ends of the two limit blocks, a slow flow plate is provided on the side of the retaining ring away from the valve disc, and a plurality of conical slow flow holes are opened on the slow flow plate.

[0005] By adopting the above technical scheme, after the medium is introduced, the pressure of the medium lifts the valve disc, and the valve disc drives the valve stem to move upward, and the two connecting rods move upward accordingly. The two connecting rods squeeze the two buffer springs, and the two buffer springs buffer the speed of the valve stem and the valve disc to reduce the vibration and noise generated when the valve stem collides, and it is not easy to cause damage to the valve stem and the valve disc. When the pump is stopped, the medium flows back, and the two connecting rods squeeze the two air springs during the resetting process of the valve disc. The conical slow-flow hole on the slow-flow plate can reduce the pressure caused by the medium backflow, thereby buffering the speed of the valve stem and the valve disc to reduce the vibration and noise generated when the valve disc collides with the valve body, and can extend the service life of the valve body and the valve disc.

[0006] Specifically, a sealing ring is fixed to the bottom end of the valve cover.

[0007] By adopting the above technical solution and setting the sealing ring, the sealing performance between the valve cover and the valve body can be improved.

[0008] Specifically, a sealing gasket is fixed to the bottom end of the valve disc.

[0009] By adopting the above technical solution, the provision of the sealing gasket can not only improve the sealing between the valve disc and the valve body, but also further buffer the speed of the valve disc.

[0010] Specifically, a plurality of connecting bolts are arranged on a side of the retaining ring away from the valve disc, and a plurality of screw holes adapted to the connecting bolts are opened on the retaining ring and the slow flow plate.

[0011] By adopting the above technical solution, the slow flow plate can be removed for cleaning or replacement by loosening the connecting bolts.

[0012] Specifically, the valve cover is connected to the valve body by bolts, and the retaining ring and the two limit blocks are welded to the valve body.

[0013] Beneficial effects of the utility model:

[0014] (1) The utility model discloses a buffer lift check valve. After the medium is introduced, the pressure of the medium pushes up the valve disc, and the valve disc drives the valve stem to move upward. The two connecting rods move upward accordingly. The two connecting rods squeeze the two buffer springs. The two buffer springs buffer the speed of the valve stem and the valve disc to reduce the vibration and noise generated when the valve stem collides with the valve stem, and it is not easy to cause damage to the valve disc and the valve stem. When the pump is stopped, the medium flows back. During the resetting process of the valve disc, the two connecting rods squeeze the two air springs. The conical slow-flow hole on the slow-flow plate can reduce the pressure caused by the medium backflow, thereby buffering the speed of the valve stem and the valve disc to reduce the vibration and noise generated when the valve disc collides with the valve body, which can extend the service life of the valve body and the valve disc.

[0015] (2) The buffer lift check valve described in the present invention has a sealing ring which can improve the sealing between the valve cover and the valve body. The sealing gasket can not only improve the sealing between the valve disc and the valve body, but also further buffer the speed of the valve disc. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0017] Figure 1 It is a cross-sectional view of the utility model;

[0018] Figure 2 For the utility model Figure 1 A magnified view of the structure at center A;

[0019] Figure 3 For the utility model Figure 1A magnified view of the structure at B in the middle.

[0020] In the figure: 1. valve body; 2. valve cover; 3. support; 4. sealing ring; 5. block; 6. valve disc; 7. valve stem; 8. sealing gasket; 9. retaining ring; 10. connecting rod; 11. vertical rod; 12. buffer spring; 13. limit block; 14. air spring; 15. slow flow plate; 16. connecting bolts. DETAILED DESCRIPTION

[0021] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below in conjunction with specific implementation methods.

[0022] In order to buffer the speed of the valve flap 6 and the valve stem 7, as an embodiment of the utility model, Figure 1 , Figure 2 , Figure 3 As shown, a buffer lift check valve described in the utility model comprises a valve body 1, a valve cover 2 is fixed to the top of the valve body 1, a support 3 is welded and fixed to the bottom of the valve cover 2, a valve flap 6 and a retaining ring 9 are arranged in the valve body 1, a valve stem 7 is welded and fixed to the top of the valve flap 6, a slot matching the valve stem 7 is arranged at the bottom of the support 3, connecting rods 10 are welded and fixed to both sides of the valve stem 7, vertical rods 11 are welded and fixed to the tops of the two connecting rods 10, and the two connecting rods 10 are welded and fixed to the tops of the two connecting rods 10. Buffer springs 12 are sleeved on the vertical rods 11, blocks 5 are welded and fixed on both sides of the support 3, through holes matching the vertical rods 11 are opened on the two blocks 5, limit blocks 13 are provided on both sides of the valve stem 7, the two limit blocks 13 are connected to the valve body 1, air springs 14 are fixed to the tops of the two limit blocks 13 by bolts, and a slow flow plate 15 is provided on the side of the retaining ring 9 away from the valve disc 6, and a plurality of conical slow flow holes are opened on the slow flow plate 15.

[0023] When in use, after the medium is introduced into the valve body 1, the pressure of the medium lifts the valve disc 6, and the valve disc 6 drives the valve stem 7 to move upward, and the two connecting rods 10 move upward accordingly. The two connecting rods 10 squeeze the two buffer springs 12, and the two buffer springs 12 buffer the speed of the valve stem 7 and the valve disc 6 to reduce the vibration and noise generated when the valve stem 7 collides with the valve body 1, and it is not easy to cause damage to the valve disc 6 and the valve stem 7. When the pump is stopped, the medium flows back, and the two connecting rods 10 squeeze the two air springs 14 during the resetting process of the valve disc 6. The conical slow-flow hole on the slow-flow plate 15 can reduce the pressure caused by the medium reflux, thereby buffering the speed of the valve stem 7 and the valve disc 6 to reduce the vibration and noise generated when the valve disc 6 collides with the valve body 1, and can extend the service life of the valve body 1 and the valve disc 6.

[0024] In order to improve the sealing between the valve cover 2 and the valve body 1, for example, Figure 1As shown, a sealing ring 4 is fixed to the bottom end of the valve cover 2 by adhesive.

[0025] In order to improve the sealing performance between the valve flap 6 and the valve body 1, for example, Figure 1 As shown, a sealing gasket 8 is fixed to the bottom end of the valve flap 6 by adhesive.

[0026] When in use, the sealing gasket 8 can not only improve the sealing between the valve flap 6 and the valve body 1 , but also further buffer the speed of the valve flap 6 .

[0027] In order to facilitate the removal, cleaning or replacement of the slow flow plate 15, for example, Figure 3 As shown, a plurality of connecting bolts 16 are provided on the side of the retaining ring 9 away from the valve disc 6 , and a plurality of screw holes adapted to the connecting bolts 16 are provided on the retaining ring 9 and the slow flow plate 15 .

[0028] The valve cover 2 is connected to the valve body 1 by bolts, and the retaining ring 9 and the two limit blocks 13 are welded to the valve body 1 .

[0029] When the utility model is in use, after the medium is introduced into the valve body 1, the pressure of the medium lifts the valve disc 6, and the valve disc 6 drives the valve stem 7 to move upward, and the two connecting rods 10 move upward accordingly, and the two connecting rods 10 squeeze the two buffer springs 12, and the two buffer springs 12 buffer the speed of the valve stem 7 and the valve disc 6, so as to reduce the vibration and noise generated when the valve stem 7 collides, and it is not easy to cause damage to the valve disc 6 and the valve stem 7;

[0030] When the pump is stopped, the medium flows back, and the two connecting rods 10 squeeze the two air springs 14 during the resetting process of the valve disc 6. The conical slow-flow holes on the slow-flow plate 15 can reduce the pressure caused by the medium backflow, thereby buffering the speed of the valve stem 7 and the valve disc 6. The sealing gasket 8 can not only improve the sealing between the valve disc 6 and the valve body 1, but also further buffer the speed of the valve disc 6 to reduce the vibration and noise generated when the valve disc 6 collides with the valve body 1, thereby extending the service life of the valve body 1 and the valve disc 6.

[0031] The above shows and describes the basic principles, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and the description in the specification are only to illustrate the principles of the utility model. Without departing from the spirit and scope of the utility model, the utility model will have various changes and improvements, and these changes and improvements fall within the scope of protection claimed by the utility model. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents. The contents not described in detail in the utility model belong to the prior art known to those skilled in the art.

Claims

1. A buffer lift check valve, characterized in that: The invention comprises a valve body (1), a valve cover (2) is fixed to the top end of the valve body (1), a support (3) is fixed to the bottom end of the valve cover (2), a valve flap (6) and a retaining ring (9) are arranged inside the valve body (1), a valve stem (7) is fixed to the top end of the valve flap (6), a slot matching the valve stem (7) is arranged at the bottom end of the support (3), connecting rods (10) are fixed to both sides of the valve stem (7), vertical rods (11) are fixed to the top ends of the two connecting rods (10), and buffer sleeves are sleeved on the two vertical rods (11). Spring (12), blocks (5) are fixed on both sides of the support (3), through holes matching the vertical rod (11) are opened on the two blocks (5), limit blocks (13) are arranged on both sides of the valve stem (7), the two limit blocks (13) are connected to the valve body (1), air springs (14) are fixed on the top of the two limit blocks (13), and a slow flow plate (15) is arranged on the side of the retaining ring (9) away from the valve disc (6), and a plurality of conical slow flow holes are opened on the slow flow plate (15).

2. A buffer lift check valve according to claim 1, characterized in that: A sealing ring (4) is fixed to the bottom end of the valve cover (2).

3. A buffer lift check valve according to claim 1, characterized in that: A sealing gasket (8) is fixed to the bottom end of the valve flap (6).

4. A buffer lift check valve according to claim 1, characterized in that: A plurality of connecting bolts (16) are provided on the side of the retaining ring (9) away from the valve flap (6), and a plurality of screw holes adapted to the connecting bolts (16) are provided on the retaining ring (9) and the slow flow plate (15).

5. The buffer lift check valve according to claim 1, characterized in that: The valve cover (2) is connected to the valve body (1) via bolts, and the retaining ring (9) and the two limit blocks (13) are welded to the valve body (1).

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