Hygienic Check Valve

Abstract

The present invention discloses a sanitary check valve, which comprises a valve body. An outlet and an inlet which are communicated with each other are arranged on the valve body. A valve seat is arranged in the inlet, and a valve flap is arranged on the valve seat. A valve rod is fixedly connected to the valve flap. A support retaining ring is arranged in the outlet, and the inner hole of the support retaining ring is slidably connected with the valve rod. A return spring is arranged between the support retaining ring and the valve flap. A damping cylinder is fixedly arranged on the support retaining ring. Damping holes are uniformly distributed on the side wall of the damping cylinder. A liquid inlet through hole is arranged at the bottom of the damping cylinder, and a one-way liquid inlet valve is arranged on the liquid inlet through hole. A piston disc is arranged at the upper end of the valve rod, and the piston disc is slidably connected with the inner hole of the damping cylinder. When the valve flap is closed, the piston disc on the valve rod moves into the damping cylinder, and the medium in the damping cylinder is forced to be extruded through the damping holes on the side wall, playing a damping role on the piston disc, so that the valve flap achieves the effect of slow closing, reducing the impact force of the sealing surface of the valve flap on the sealing surface of the valve seat and reducing the occurrence of water hammer phenomenon.

Description

Technical Field

[0001] The present invention relates to the technical field of check valves, and particularly to a sanitary check valve. Background Art

[0002] A check valve is a commonly used valve in a pipeline system, mainly installed at the outlet of a pump, and is used to connect and check the fluid medium in the pipeline system. Existing check valves mainly include a valve body, a valve seat, and a check valve flap. The valve seat is provided with a valve seat sealing surface and is fixed in the flow channel of the valve body. The check valve flap is provided with a valve flap sealing surface. When the medium enters the inner cavity of the valve body from the valve inlet side, the medium pushes the check valve flap to open. When there is no medium entering the valve inlet side, the check valve flap closes under the action of a spring. Its disadvantages are as follows: During the process of the check valve flap resetting and closing, it is easy to have too fast a closing speed, resulting in too large an impact force of the valve flap sealing surface on the valve seat sealing surface, which is easy to damage; at the same time, when the check valve flap closes quickly, it is easy to generate water hammer, resulting in damage to the valve and other harmful situations. Summary of the Invention

[0003] The present invention aims to solve the problems existing in the above-mentioned prior art, and provides a sanitary check valve, which can control the closing speed of the check valve flap in the final stage, reduce the impact force of the valve flap sealing surface on the valve seat sealing surface, reduce the occurrence of water hammer phenomenon, and extend the service life of the valve.

[0004] The technical solution adopted by the present invention to solve its technical problems: A sanitary check valve includes a valve body, on which there are a water outlet and a water inlet that are interconnected. A valve seat is arranged in the water inlet, a valve flap is arranged on the valve seat, a valve rod is fixedly connected to the valve flap. A support retaining ring is arranged in the water outlet, the inner hole of the support retaining ring is slidably connected to the valve rod, a return spring is arranged between the support retaining ring and the valve flap. A damping cylinder is fixedly arranged on the support retaining ring, damping holes are evenly distributed on the side wall of the damping cylinder, a liquid inlet through hole is arranged at the bottom of the damping cylinder, and a one-way liquid inlet valve is arranged on the liquid inlet through hole. A piston disk is arranged at the upper end of the valve rod, and the piston disk is slidably connected to the inner hole of the damping cylinder.

[0005] For further improvement, the surface of the piston disk is provided with hollow holes, and an elastic opening and closing gasket covering the hollow holes is arranged on the lower side of the piston disk. The inner ring of the elastic opening and closing gasket is fixedly connected to the piston disk by screws.

[0006] For further improvement, an elastic sealing ring is fixedly installed on the side wall of the piston disk, and a plurality of strip-shaped through holes are circumferentially distributed on the elastic sealing ring. The groove shape of the strip-shaped through holes is a V shape with a smaller upper part and a larger lower part.

[0007] Further improvement: The one-way liquid inlet valve includes a support spring and a valve ring. The inner hole diameter of the valve ring is larger than the diameter of the valve stem. One end of the support spring is fixedly connected to the valve ring, and the other end of the support spring is fixedly connected to a limit hook provided on the inner wall of the damping cylinder. A buffer washer is fixedly installed on the side of the limit hook facing the piston disc.

[0008] Further improvement: The damping hole is composed of multiple inclined damping channels at the inner end and a confluence port on the outer side.

[0009] Further improvement: A magnet column is provided on the lower side of the valve flap, and a closing coil for plugging and mating with the magnet column is fixedly installed on the inner wall of the water inlet.

[0010] Further improvement: A toggle switch for turning the circuit on and off is provided on the closing coil. The toggle switch is driven by the magnet column to conduct the closing coil during the process of the magnet column inserting into the closing coil, and the toggle switch is driven by the magnet column to cut off the closing coil during the process of the magnet column pulling out of the closing coil.

[0011] Further improvement: A sealing shell is provided outside the closing coil. The toggle switch is located on the inner wall of the sealing shell. The toggle switch includes a switch handle for turning the circuit on or off, and a magnet block magnetically adsorbed and connected to the magnet column is provided on the switch handle.

[0012] Further improvement: Axial limit sliding grooves are provided on the valve stem. An inclined transition surface is provided at the upper end of the axial limit sliding grooves. Elastic brake blocks are provided in the axial limit sliding grooves, and the elastic brake blocks are fixedly connected to the support retaining rings.

[0013] The beneficial effects of the present invention are as follows: When the valve flap is closed, the piston disc on the valve stem moves into the damping cylinder, and the medium in the damping cylinder is forced to be extruded through the damping holes on the side wall, playing a damping role on the piston disc, so as to make the valve flap achieve the effect of slow closing, reduce the impact force of the valve flap sealing surface on the valve seat sealing surface, reduce the occurrence of water hammer phenomenon, and extend the service life of the valve. When the valve flap is opened, the medium enters the damping cylinder through the one-way liquid inlet valve on the liquid inlet through-hole, reducing the resistance between the piston disc and the damping cylinder, facilitating the rapid movement of the piston disc out of the damping cylinder, and thus not affecting the rapid opening of the valve flap. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a schematic structural diagram of the present invention.

[0015] Figure 2 is an enlarged schematic structural diagram of the damping cylinder.

[0016] Figure 3 is an enlarged schematic structural diagram of the valve stem.

[0017] Figure 4 is an enlarged schematic structural diagram of the closing coil.

[0018] Description of reference numerals: 1. Valve body, 11. Water outlet, 12. Water inlet, 13. Valve seat, 14. Return spring, 2. Valve flap, 21. Magnet column, 3. Valve rod, 31. Axial limit chute, 32. Inclined transition surface, 4. Support retaining ring, 41. Elastic brake block, 5. Damper cylinder, 51. Damper hole, 511. Inclined damper channel, 512. Confluence port, 52. Liquid inlet through-hole, 53. One-way liquid inlet valve, 531. Support spring, 532. Valve ring, 533. Limit hook, 534. Buffer washer, 54. Piston disc, 541. Hollow hole, 542. Elastic opening and closing gasket, 543. Screw, 544. Elastic sealing ring, 545. Strip-shaped slot hole, 6. Closing coil, 61. Toggle switch, 62. Sealing shell, 63. Magnet block. Detailed implementation manners

[0019] The present invention will be further described below with reference to the accompanying drawings:

[0020] As shown in the Figure 1 accompanying drawings, in Embodiment 1: A sanitary check valve includes a valve body 1, and a water outlet 11 and a water inlet 12 that communicate with each other are provided on the valve body 1. A valve seat 13 is provided in the water inlet 12, a valve flap 2 is provided on the valve seat 13, a valve rod 3 is fixedly connected to the valve flap 2. A support retaining ring 4 is erected in the water outlet 11, the inner hole of the support retaining ring 4 is slidably connected to the valve rod 3, and a return spring 14 is provided between the support retaining ring 4 and the valve flap 2. A damper cylinder 5 is fixedly provided on the support retaining ring 4, damper holes 51 are uniformly distributed on the side wall of the damper cylinder 5, a liquid inlet through-hole 52 is provided at the bottom of the damper cylinder 5, and a one-way liquid inlet valve 53 is provided on the liquid inlet through-hole 52. A piston disc 54 is provided at the upper end of the valve rod 3, and the piston disc 54 is slidably connected to the inner hole of the damper cylinder 5.

[0021] Working principle: Install the check valve into the pipeline. The liquid medium flows in from the water inlet 12 and flows out from the water outlet 11. When the pressure difference between one end of the water inlet 12 and the water outlet 11 is greater than a certain threshold, the valve flap 2 overcomes the elastic force of the return spring 14 to open. When the pressure difference between one end of the water inlet 12 and the water outlet 11 is less than a certain threshold, the valve flap 2 moves downward under the action of the elastic force of the return spring 14 to close. When the valve flap 2 closes, the piston disc 54 on the valve rod 3 moves into the damper cylinder 5, and the medium in the damper cylinder 5 is forced to be extruded through the damper holes 51 on the side wall, playing a damping role on the piston disc 54, so as to make the valve flap 2 achieve a slow closing effect, reduce the impact force of the sealing surface of the valve flap 2 on the sealing surface of the valve seat 13, reduce the occurrence of water hammer phenomenon, and extend the service life of the valve. When the valve flap 2 opens, the medium enters the inside of the damper cylinder 5 through the one-way liquid inlet valve 53 on the liquid inlet through-hole 52, reducing the resistance between the piston disc 54 and the damper cylinder 5, facilitating the piston disc 54 to quickly move out of the damper cylinder 5, and enabling the valve flap 2 to open relatively quickly.

[0022] As shown in the appendix Figure 2 Shown in the figure, Embodiment 2: On the basis of Embodiment 1, the surface of the piston disc 54 is provided with a hollow hole 541, and an elastic opening and closing gasket 542 covering the hollow hole 541 is provided on the lower side of the piston disc 54. The inner ring of the elastic opening and closing gasket 542 is fixedly connected to the piston disc 54 through a screw 543. When the piston disc 54 moves upward, the liquid medium pushes open part of the elastic opening and closing gasket 542, passes through the hollow hole 541 and flows into the damping cylinder 5, so that it is more labor-saving for the piston disc 54 to move out of the damping cylinder 5, reducing the resistance to the opening of the valve flap 2. When the piston disc 54 moves downward, the elastic opening and closing gasket 542 closes the hollow hole 541, increasing the resistance to the piston disc 54 moving into the damping cylinder 5, improving the damping effect, and making the closing process of the valve flap 2 gentle.

[0023] An elastic sealing ring 544 is fixedly installed on the side wall of the piston disc 54. A number of strip-shaped holes 545 are circumferentially distributed on the elastic sealing ring 544, and the groove shape of the strip-shaped holes 545 is a V shape with a smaller upper part and a larger lower part. During the process of the piston disc 54 moving downward in the damping cylinder 5, part of the medium is forced to flow out through the strip-shaped holes 545, improving the efficiency of converting mechanical energy into internal energy, and under the action of the V-shaped structure, the diameter of the elastic sealing ring 544 becomes larger and comes into contact and friction with the inner wall of the damping cylinder 5, increasing the deceleration of the piston disc 54.

[0024] The one-way liquid inlet valve 53 includes a support spring 531 and a valve ring 532. The inner hole diameter of the valve ring 532 is larger than the diameter of the valve stem 3. One end of the support spring 531 is fixedly connected to the valve ring 532, and the other end of the support spring 531 is fixedly connected to a limit hook 533 arranged on the inner wall of the damping cylinder 5. A buffer washer 534 is fixedly installed on the side of the limit hook 533 facing the piston disc 54. During the process of the piston disc 54 moving upward in the damping cylinder 5, the pressure in the damping cylinder 5 decreases. Under the action of the pressure difference, the liquid medium pushes open the valve ring 532 and enters the damping cylinder 5 through the liquid inlet through hole 52, making the resistance of the inflowing medium less than the resistance of flowing in from the damping hole 51. The spring constant of the support spring 531 is small and is used for the downward reset of the valve ring 532. The buffer washer 534 is made of sponge material and can buffer when the piston disc 54 moves to the bottom in the damping cylinder 5, thus effectively reducing the impact force of the sealing surface of the valve flap 2 on the sealing surface of the valve seat 13.

[0025] The damping hole 51 is composed of a plurality of inclined damping channels 511 at the inner end and a confluence port 512 on the outside. During the process of the liquid medium flowing out of the damping hole 51, multiple liquid flows coming from the inclined damping channels 511 finally collide and converge at the confluence port 512 and then spray out, making the damping hole 51 have a greater damping effect.

[0026] As shown in the appendix Figure 3As shown in the figure, Embodiment 3: On the basis of Embodiment 1 or 2, a magnet post 21 is provided on the lower side of the valve flap 2, and a closing coil 6 which is inserted and matched with the magnet post 21 is fixedly installed on the inner wall of the water inlet 12. When the valve flap 2 is finally closed, the magnet post 21 is inserted into the closing coil 6. According to Lenz's law, the magnetic field of the induced current always hinders the change of the magnetic flux that causes the induced current. The closing coil 6 generates an electromagnetic resistance to the magnet post 2. The greater the closing speed of the valve flap 2, the stronger the electromagnetic damping effect, and the better the slow-closing effect.

[0027] A toggle switch 61 for switching the circuit on and off is provided on the closing coil 6. The toggle switch 61 is driven by the magnet post 21 to conduct the closing coil 6 during the process of the magnet post 21 being inserted into the closing coil 6, and the toggle switch 61 is driven by the magnet post 21 to cut off the closing coil 6 during the process of the magnet post 21 being pulled out of the closing coil 6. By setting the toggle switch 61, the closing coil 6 generates a on-off change during the insertion and extraction of the magnet post 21, so that the electromagnetic damping is enabled when the valve flap 2 is closed, and the electromagnetic damping is deactivated when the valve flap 2 is opened, thus not affecting the normal use of the valve flap 2.

[0028] A sealing shell 62 is provided outside the closing coil 6. The toggle switch 61 is located on the inner wall of the sealing shell 62. The toggle switch 61 includes a switch handle for connecting or disconnecting the circuit. A magnet block 63 magnetically adsorbed and connected with the magnet post 21 is provided on the switch handle. By setting the sealing shell 62 and the magnet block 63, the magnet post 21 drives the magnet block 63 to move through magnetic force to control the switch of the toggle switch 61, which can reduce wear and improve the sealing performance.

[0029] As shown in the appendix Figure 4 As shown in the figure, Embodiment 4: On the basis of Embodiment 3, an axial limiting chute 31 is provided on the valve stem 3. An inclined transition surface 32 is provided at the upper end of the axial limiting chute 31. An elastic brake block 41 is provided in the axial limiting chute 31. The elastic brake block 41 is fixedly connected with the support retaining ring 4. The axial limiting chute 31 has a circumferential limiting effect, which can prevent the valve stem 3 from rotating relative to the support retaining ring 4 during the sliding process, and the valve flap 2 moves more stably. When the valve flap 2 is closed, the elastic brake block 41 touches the inclined transition surface 32, which can further share the impact force of the sealing surface of the valve flap 2 on the sealing surface of the valve seat 13.

[0030] Although the present invention has been illustrated and described by reference to the preferred embodiments, those skilled in the art should understand that various changes in form and details may be made within the scope of the claims.

Claims

1. Hygienic check valve, including a valve body (1), on which there are a water outlet (11) and a water inlet (12) that communicate with each other. A valve seat (13) is provided in the water inlet (12), and a valve flap (2) is provided on the valve seat (13). A valve stem (3) is fixedly connected to the valve flap (2). A support retaining ring (4) is installed in the water outlet (11), and the inner hole of the support retaining ring (4) is slidably connected to the valve stem (3). A return spring is provided between the support retaining ring (4) and the valve flap (2). It is characterized in that: A damping cylinder (5) is fixedly provided on the support retaining ring (4). Damping holes (51) are evenly distributed on the side wall of the damping cylinder (5). A liquid inlet through hole (52) is provided at the bottom of the damping cylinder (5), and a one-way liquid inlet valve (53) is provided on the liquid inlet through hole (52). A piston disc (54) is provided at the upper end of the valve stem (3), and the piston disc (54) is slidably connected to the inner hole of the damping cylinder (5). A magnet column (21) is provided on the lower side of the valve flap (2), and a closing coil (6) that is inserted and matched with the magnet column (21) is fixedly installed on the inner wall of the water inlet (12). A toggle switch (61) that can turn the circuit on and off is provided on the closing coil (6). The toggle switch (61) is driven by the magnet column (21) to conduct the closing coil (6) during the process of the magnet column (21) being inserted into the closing coil (6), and the toggle switch (61) is driven by the magnet column (21) to cut off the closing coil (6) during the process of the magnet column (21) being pulled out of the closing coil (6). An elastic sealing ring (544) is fixedly installed on the side wall of the piston disc (54). A number of strip-shaped through holes (545) are circumferentially distributed on the elastic sealing ring (544), and the groove shape of the strip-shaped through holes (545) is a V shape with a smaller upper part and a larger lower part.

2. The hygienic check valve according to claim 1, It is characterized in that: Hollow holes (541) are provided on the surface of the piston disc (54), and an elastic opening and closing gasket (542) that covers the hollow holes (541) is provided on the lower side of the piston disc (54). The inner ring of the elastic opening and closing gasket (542) is fixedly connected to the piston disc (54) by screws (543).

3. The hygienic check valve according to claim 1, It is characterized in that: The one-way liquid inlet valve (53) includes a support spring (531) and a valve ring (532). The inner hole diameter of the valve ring (532) is larger than the diameter of the valve stem (3). One end of the support spring (531) is fixedly connected to the valve ring (532), and the other end of the support spring (531) is fixedly connected to a limit hook (533) provided on the inner wall of the damping cylinder (5). A buffer gasket (534) is fixedly installed on the side of the limit hook (533) facing the piston disc (54).

4. The hygienic check valve according to claim 1, It is characterized in that: The damping holes (51) are composed of a plurality of inclined damping channels (511) at the inner end and a confluence port (512) on the outside.

5. The hygienic check valve according to claim 1, It is characterized in that: An outer part of the closed coil (6) is provided with a sealing shell (62), and the toggle switch (61) is located on an inner wall of the sealing shell (62). The toggle switch (61) includes a switch handle for turning on or off a circuit, and a magnet block (63) magnetically adsorbed and connected to the magnet column (21) is arranged on the switch handle.

6. The sanitary check valve according to claim 1, characterized in that: an axial limiting sliding groove (31) is arranged on the valve rod (3), an upper end of the axial limiting sliding groove (31) is provided with an inclined transition surface (32), an elastic brake block (41) is arranged in the axial limiting sliding groove (31), and the elastic brake block (41) is fixedly connected with the support retaining ring (4).

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