A multifunctional damping check valve

Abstract

The invention discloses a multifunctional damping check valve, comprising a valve body, a top cover, a valve port and an inner cavity of the valve body, wherein the top cover is arranged above the valve port, the top cover is connected to the valve body, a valve core body is arranged in the inner cavity of the valve body, a piston, a linear bearing and an A spring are arranged from top to bottom on the valve core body, the inner wall of the piston is connected to the outer wall of the valve core body, the outer wall of the piston is closely fitted to the inner wall of the valve port, the inner wall of the linear bearing is connected to the outer wall of the valve core body, the outer wall of the linear bearing is connected to the inner wall of the valve port, the A spring is sleeved on the outer surface of the valve core body, one end of the A spring is connected to the bottom of the linear bearing, a water flow two-way control mechanism is arranged at the bottom of the valve core body, the water flow two-way control mechanism is connected to the bottom of the valve core body, and the water flow two-way control mechanism is also connected to the other end of the A spring. The invention not only controls the movement of the valve core body and reduces the wear of the valve core body, but also reduces the pressure shock of the pipe network caused when the check valve is closed, ensures the safety of the pipe network, and also increases the service life of the check valve.

Description

Technical Field

[0001] The invention relates to a multifunctional damping check valve, belonging to the technical field of valves. Background Art

[0002] In industrial pipe networks, in order to prevent the backflow of pipeline media and damage to the power pump, a check valve is often designed and installed at the outlet of the pump so that the medium can only flow in one direction. The existing general check valve has a disc-shaped control mechanism in the valve body, which can rotate around the rotating shaft set in the valve body. When the fluid medium in the pipeline flows back, the sealing surface of the control mechanism closely matches the sealing surface of the valve body under the action of the backflow medium, so that the valve is quickly closed to prevent the backflow of the medium. However, when the valve is closed, due to the fast backflow speed of the medium and the high instantaneous pressure, the sealing surface of the control mechanism impacts the sealing surface of the valve body at high speed, causing the sealing surface to be damaged and cause internal leakage, reducing the service life of the valve, and at the same time, a loud noise is emitted accompanied by water hammer phenomenon, which causes pipeline rupture in severe cases. When the ordinary check valve is used in the pipe network, the pressure fluctuation of the pipe network will cause the valve core body to move, and the movement will interact with the pressure wave of the pipe network to produce new pressure fluctuations. The pipe network pressure oscillation caused by the ordinary check valve when it is quickly closed is not conducive to the safety of the pipe network and energy saving, and shortens the service life of the check valve. Summary of the invention

[0003] The purpose of the present invention is to provide a multifunctional damping check valve, which not only controls the movement of the valve core body and reduces the wear of the valve core body, but also reduces the pipeline pressure shock caused by the closing of the check valve, thereby ensuring the safety of the pipeline network and increasing the service life of the check valve.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions: a multifunctional damping check valve, comprising a valve body, a top cover, a valve port and an inner cavity of the valve body, the top cover is arranged above the valve port, the top cover is fixedly connected to the valve body, a valve core body is arranged in the inner cavity of the valve body, the valve core body is provided with a piston, a linear bearing and an A spring from top to bottom, the inner wall of the piston is fixedly connected to the outer wall of the valve core body, the outer wall of the piston is tightly fitted with the inner wall of the valve port, the inner wall of the linear bearing is fixedly connected to the outer wall of the valve core body, the outer wall of the linear bearing is fixedly connected to the inner wall of the valve port, the A spring is sleeved on the outer surface of the valve core body, one end of the A spring is fixedly connected to the bottom of the linear bearing, a water flow two-way control mechanism is arranged at the bottom of the valve core body, the water flow two-way control mechanism is fixedly connected to the bottom of the valve core body, and the water flow two-way control mechanism is also fixedly connected to the other end of the A spring; the movement of the valve core body is controlled to reduce the wear of the valve core body, the pressure oscillation of the pipeline network caused by the closing of the check valve is reduced, the safety of the pipeline network is guaranteed, and the service life of the check valve is increased.

[0005] The aforementioned multifunctional damping check valve, wherein the inner cavity of the valve body comprises an upper inner cavity and a lower inner cavity, and an inlet is arranged between the upper inner cavity and the lower inner cavity.

[0006] In the aforementioned multifunctional damping check valve, a through hole A is provided in the center of the top of the valve core body; the fluid passes through the through hole A to exert pressure on the partition, causing the partition to open slowly.

[0007] In the aforementioned multifunctional damping check valve, the outer wall of the piston is provided with a double-ring sealing ring, so that the sealing effect between the piston and the valve port is better.

[0008] The aforementioned multifunctional damping check valve, the water flow two-way control mechanism includes a top disc, a partition, a B spring, a connecting column and a bottom disc, the top disc is fixedly connected to the valve core body, the top disc is arranged above the inlet, the outer diameter of the top disc is larger than the outer diameter of the valve core body, a B through hole is opened in the middle of the top disc, the diameter of the B through hole is consistent with the diameter of the A through hole, and the B through hole penetrates the A through hole, the partition is arranged below the top disc, a C through hole is opened in the middle of the partition, the diameter of the C through hole is smaller than the diameter of the B through hole, the A through hole, the B through hole and the C through hole are connected and arranged, one end of the B spring is in contact with the bottom of the partition, and the B spring The other end is fixedly connected to the top of the bottom disc, the diameter of the B spring is smaller than that of the A spring, and the bottom disc is fixedly connected to the top disc through a connecting column; the top disc fixes the water flow two-way control mechanism to the valve core body, and the diaphragm opens or closes the check valve under the action of the positive or negative pressure of the fluid, and the B spring adjusts the diaphragm to open or close. The connecting column connects the top disc and the bottom disc, and the bottom disc provides support for the B spring. The A through hole, the B through hole and the C through hole are connected and arranged, so that the piston can control the up and down movement of the valve core body caused by pressure shock by inhaling and exhaling a small flow rate through the C through hole to generate positive or negative pressure in the upper inner cavity.

[0009] In the aforementioned multifunctional damping check valve, there are multiple connecting columns, and the multiple connecting columns are arranged equidistantly in a circle.

[0010] The aforementioned multifunctional damping check valve has a ring at the bottom of the top disc, the top of the ring is fixedly connected to the bottom of the top disc, the inner diameter of the ring is larger than the outer diameter of the partition, and the outer diameter of the ring is smaller than the outer diameter of the top disc; the partition is prevented from moving left and right.

[0011] The aforementioned multifunctional damping check valve has a water drain area between the circular ring and the partition.

[0012] In the aforementioned multifunctional damping check valve, the diameter of the C through hole is set according to the change of fluid density and the change of the speed of closing the multifunctional damping check valve.

[0013] Compared with the prior art, the present invention comprises a valve body, a top cover, a valve port and an inner cavity of the valve body, wherein the top cover is arranged above the valve port, the top cover is fixedly connected to the valve body, a valve core body is arranged in the inner cavity of the valve body, and a piston, a linear bearing and an A spring are arranged on the valve core body from top to bottom, the inner wall of the piston is fixedly connected to the outer wall of the valve core body, the outer wall of the piston is tightly fitted with the inner wall of the valve port, the inner wall of the linear bearing is fixedly connected to the outer wall of the valve core body, the outer wall of the linear bearing is fixedly connected to the inner wall of the valve port, the A spring is sleeved on the outer surface of the valve core body, one end of the A spring is fixedly connected to the bottom of the linear bearing, a water flow two-way control mechanism is arranged at the bottom of the valve core body, the water flow two-way control mechanism is fixedly connected to the bottom of the valve core body, and the water flow two-way control mechanism is also fixedly connected to the other end of the A spring. The present invention not only controls the movement of the valve core body and reduces the wear of the valve core body, but also reduces the pressure oscillation of the pipeline network caused by the closing of the check valve, thereby ensuring the safety of the pipeline network and increasing the service life of the check valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the structure of the present invention;

[0015] Figure 2 It is a schematic diagram of the structure of the piston and the double-ring seal ring of the present invention;

[0016] Figure 3 It is a structural schematic diagram of the water flow bidirectional control mechanism of the present invention.

[0017] Figure markings: 1-valve body, 2-top cover, 3-valve port, 4-valve body inner cavity, 5-valve core body, 6-piston, 7-linear bearing, 8-A spring, 9-water flow two-way control mechanism, 10-upper inner cavity, 11-lower inner cavity, 12-inlet, 13-A through hole, 14-double-ring sealing ring, 15-top disc, 16-partition, 17-B spring, 18-connecting column, 19-bottom disc, 20-B through hole, 21-C through hole, 22-ring, 23-drainage area.

[0018] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. DETAILED DESCRIPTION

[0019] Embodiment 1 of the present invention: A multifunctional damping check valve comprises a valve body 1, a top cover 2, a valve port 3 and a valve body inner cavity 4, wherein the top cover 2 is arranged above the valve port 3, the top cover 2 is fixedly connected to the valve body 1, the valve body inner cavity 4 is provided with a valve core body 5, the valve core body 5 is provided with a piston 6, a linear bearing 7 and an A spring 8 from top to bottom, the inner wall of the piston 6 is fixedly connected to the outer wall of the valve core body 5, the outer wall of the piston 6 is tightly fitted with the inner wall of the valve port 3, the inner wall of the linear bearing 7 is fixedly connected to the outer wall of the valve core body 5, the outer wall of the linear bearing 7 is fixedly connected to the valve core body 5, and the outer wall of the linear bearing 7 is fixedly connected to the valve core body 5. The inner wall of the valve opening 3 is fixedly connected, the A spring 8 is sleeved on the outer surface of the valve core body 5, one end of the A spring 8 is fixedly connected to the bottom of the linear bearing 7, and a two-way water flow control mechanism 9 is arranged at the bottom of the valve core body 5, and the two-way water flow control mechanism 9 is also fixedly connected to the other end of the A spring 8; it not only controls the movement of the valve core body 5 and reduces the wear of the valve core body 5, but also reduces the pipeline pressure shock caused by the closing of the check valve, thereby ensuring the safety of the pipeline network and increasing the service life of the check valve.

[0020] Embodiment 2 of the present invention: A multifunctional damping check valve comprises a valve body 1, a top cover 2, a valve port 3 and a valve body inner cavity 4, wherein the top cover 2 is arranged above the valve port 3, the top cover 2 is fixedly connected to the valve body 1, the valve body inner cavity 4 is provided with a valve core body 5, the valve core body 5 is provided with a piston 6, a linear bearing 7 and an A spring 8 from top to bottom, the inner wall of the piston 6 is fixedly connected to the outer wall of the valve core body 5, the outer wall of the piston 6 is tightly fitted with the inner wall of the valve port 3, the inner wall of the linear bearing 7 is fixedly connected to the outer wall of the valve core body 5, the outer wall of the linear bearing 7 is fixedly connected to the inner wall of the valve port 3, the A spring 8 is sleeved on the valve core The outer surface of the body 5, one end of the A spring 8 is fixedly connected to the bottom of the linear bearing 7, and a two-way water flow control mechanism 9 is arranged at the bottom of the valve core body 5, and the two-way water flow control mechanism 9 is fixedly connected to the bottom of the valve core body 5, and the two-way water flow control mechanism 9 is also fixedly connected to the other end of the A spring 8; it not only controls the movement of the valve core body 5 to reduce the wear of the valve core body 5, but also reduces the pipeline pressure shock caused by the closing of the check valve, thereby ensuring the safety of the pipeline network and increasing the service life of the check valve; the inner cavity 4 of the valve body includes an upper inner cavity 10 and a lower inner cavity 11, and an inlet 12 is arranged between the upper inner cavity 10 and the lower inner cavity 11.

[0021] Embodiment 3 of the present invention: A multifunctional damping check valve comprises a valve body 1, a top cover 2, a valve port 3 and a valve body inner cavity 4, wherein the top cover 2 is arranged above the valve port 3, the top cover 2 is fixedly connected to the valve body 1, the valve body inner cavity 4 is provided with a valve core body 5, the valve core body 5 is provided with a piston 6, a linear bearing 7 and an A spring 8 from top to bottom, the inner wall of the piston 6 is fixedly connected to the outer wall of the valve core body 5, the outer wall of the piston 6 is tightly fitted with the inner wall of the valve port 3, the inner wall of the linear bearing 7 is fixedly connected to the outer wall of the valve core body 5, the outer wall of the linear bearing 7 is fixedly connected to the inner wall of the valve port 3, the A spring 8 is sleeved on the outer surface of the valve core body 5, and one end of the A spring 8 is fixed to the bottom of the linear bearing 7 A two-way water flow control mechanism 9 is connected at the bottom of the valve core body 5, and the two-way water flow control mechanism 9 is fixedly connected to the bottom of the valve core body 5, and the two-way water flow control mechanism 9 is also fixedly connected to the other end of the A spring 8; it not only controls the movement of the valve core body 5 to reduce the wear of the valve core body 5, but also reduces the pipeline pressure shock caused by the closing of the check valve, thereby ensuring the safety of the pipeline and increasing the service life of the check valve; the valve body inner cavity 4 includes an upper inner cavity 10 and a lower inner cavity 11, and an inlet 12 is arranged between the upper inner cavity 10 and the lower inner cavity 11; a through hole A 13 is provided in the center of the top of the valve core body 5; the fluid passes through the A through hole 13 to apply pressure to the partition 16, so that the partition 16 opens slowly.

[0022] Embodiment 4 of the present invention: A multifunctional damping check valve comprises a valve body 1, a top cover 2, a valve port 3 and a valve body inner cavity 4, wherein the top cover 2 is arranged above the valve port 3, the top cover 2 is fixedly connected to the valve body 1, the valve body inner cavity 4 is provided with a valve core body 5, the valve core body 5 is provided with a piston 6, a linear bearing 7 and an A spring 8 from top to bottom, the inner wall of the piston 6 is fixedly connected to the outer wall of the valve core body 5, the outer wall of the piston 6 is tightly fitted with the inner wall of the valve port 3, the inner wall of the linear bearing 7 is fixedly connected to the outer wall of the valve core body 5, the outer wall of the linear bearing 7 is fixedly connected to the inner wall of the valve port 3, the A spring 8 is sleeved on the outer surface of the valve core body 5, one end of the A spring 8 is fixedly connected to the bottom of the linear bearing 7, and the bottom of the valve core body 5 is provided with a water flow double Toward the control mechanism 9, the water flow two-way control mechanism 9 is fixedly connected to the bottom of the valve core body 5, and the water flow two-way control mechanism 9 is also fixedly connected to the other end of the A spring 8; it not only controls the movement of the valve core body 5 to reduce the wear of the valve core body 5, but also reduces the pipeline pressure shock caused by the closing of the check valve, ensures the safety of the pipeline, and at the same time increases the service life of the check valve; the valve body inner cavity 4 includes an upper inner cavity 10 and a lower inner cavity 11, and an inlet 12 is arranged between the upper inner cavity 10 and the lower inner cavity 11; a through hole A 13 is opened in the center of the top of the valve core body 5; the fluid passes through the A through hole 13, pressurizes the partition 16, and slowly opens the partition 16; the outer wall of the piston 6 is provided with a double-ring sealing ring 14; the sealing effect of the piston 6 and the valve port 3 is better.

[0023] Embodiment 5 of the present invention: A multifunctional damping check valve comprises a valve body 1, a top cover 2, a valve port 3 and a valve body inner cavity 4, wherein the top cover 2 is arranged above the valve port 3, the top cover 2 is fixedly connected to the valve body 1, the valve body inner cavity 4 is provided with a valve core body 5, the valve core body 5 is provided with a piston 6, a linear bearing 7 and an A spring 8 from top to bottom, the inner wall of the piston 6 is fixedly connected to the outer wall of the valve core body 5, the outer wall of the piston 6 is tightly fitted with the inner wall of the valve port 3, the inner wall of the linear bearing 7 is fixedly connected to the outer wall of the valve core body 5, the outer wall of the linear bearing 7 is fixedly connected to the inner wall of the valve port 3, the A spring 8 is sleeved on the outer surface of the valve core body 5, one end of the A spring 8 is fixedly connected to the bottom of the linear bearing 7, and the bottom of the valve core body 5 is provided with a water flow two-way control mechanism 9. The water flow two-way control mechanism 9 is fixedly connected to the bottom of the valve core body 5, and the water flow two-way control mechanism 9 is also fixedly connected to the other end of the A spring 8; it not only controls the movement of the valve core body 5 to reduce the wear of the valve core body 5, but also reduces the pipeline pressure shock caused by the closing of the check valve, thereby ensuring the safety of the pipeline network and increasing the service life of the check valve; the inner cavity 4 of the valve body includes an upper cavity 10 and a lower cavity 11, and an inlet 12 is arranged between the upper cavity 10 and the lower cavity 11; a through hole A 13 is provided in the center of the top of the valve core body 5; the fluid passes through the A through hole 13 to apply pressure to the partition 16, so that the partition 16 opens slowly; the outer wall of the piston 6 is provided with a double-ring sealing ring 14; the sealing effect of the piston 6 and the valve port 3 is better; the water flow two-way control mechanism 9 comprises a top disc 15, a partition 16, a B spring 17, a connecting column 18 and a bottom disc 19, wherein the top disc 15 is fixedly connected to the valve core body 5, the top disc 15 is arranged above the inlet 12, the outer diameter of the top disc 15 is larger than the outer diameter of the valve core body 5, a B through hole 20 is opened in the middle of the top disc 15, the diameter of the B through hole 20 is consistent with the diameter of the A through hole 13, the B through hole 20 and the A through hole 13 penetrate, the partition 16 is arranged below the top disc 15, a C through hole 21 is opened in the middle of the partition 16, the diameter of the C through hole 21 is smaller than the diameter of the B through hole 20, the A through hole 13, the B through hole 20 and the C through hole 21 are connected and arranged, one end of the B spring 17 is in contact with the bottom of the partition 16, and the other end of the B spring 17 is in contact with the bottom of the partition 16. The top of the bottom disc 19 is fixedly connected, the diameter of the B spring 17 is smaller than the diameter of the A spring 8, and the bottom disc 19 is fixedly connected to the top disc 15 through the connecting column 18; the top disc 15 fixes the water flow two-way control mechanism 9 to the valve core body 5, and the partition 16 opens or closes the check valve under the action of the positive or negative pressure of the fluid, and the B spring 17 adjusts the opening or closing state of the partition 16. The connecting column 18 connects the top disc 15 and the bottom disc 19, and the bottom disc 19 provides support for the B spring 17. The A through hole 13, the B through hole 20 and the C through hole 21 are connected and arranged, so that the piston 6 controls the up and down movement of the valve core body 5 caused by pressure shock by inhaling and exhaling a small flow rate with the C through hole 21 to generate positive pressure or negative pressure in the upper inner cavity 10.

[0024] Embodiment 6 of the present invention: A multifunctional damping check valve comprises a valve body 1, a top cover 2, a valve port 3 and a valve body inner cavity 4, wherein the top cover 2 is arranged above the valve port 3, the top cover 2 is fixedly connected to the valve body 1, the valve body inner cavity 4 is provided with a valve core body 5, the valve core body 5 is provided with a piston 6, a linear bearing 7 and an A spring 8 from top to bottom, the inner wall of the piston 6 is fixedly connected to the outer wall of the valve core body 5, the outer wall of the piston 6 is tightly fitted with the inner wall of the valve port 3, the inner wall of the linear bearing 7 is fixedly connected to the outer wall of the valve core body 5, the outer wall of the linear bearing 7 is fixedly connected to the inner wall of the valve port 3, the A spring 8 is sleeved on the outer surface of the valve core body 5, one end of the A spring 8 is fixedly connected to the bottom of the linear bearing 7, and the bottom of the valve core body 5 is provided with a water flow two-way control mechanism 9. The water flow two-way control mechanism 9 is fixedly connected to the bottom of the valve core body 5, and the water flow two-way control mechanism 9 is also fixedly connected to the other end of the A spring 8; it not only controls the movement of the valve core body 5 to reduce the wear of the valve core body 5, but also reduces the pipeline pressure shock caused by the closing of the check valve, thereby ensuring the safety of the pipeline network and increasing the service life of the check valve; the inner cavity 4 of the valve body includes an upper cavity 10 and a lower cavity 11, and an inlet 12 is arranged between the upper cavity 10 and the lower cavity 11; a through hole A 13 is provided in the center of the top of the valve core body 5; the fluid passes through the A through hole 13 to apply pressure to the partition 16, so that the partition 16 opens slowly; the outer wall of the piston 6 is provided with a double-ring sealing ring 14; the sealing effect of the piston 6 and the valve port 3 is better; the water flow two-way control mechanism 9 comprises a top disc 15, a partition 16, a B spring 17, a connecting column 18 and a bottom disc 19, wherein the top disc 15 is fixedly connected to the valve core body 5, the top disc 15 is arranged above the inlet 12, the outer diameter of the top disc 15 is larger than the outer diameter of the valve core body 5, a B through hole 20 is opened in the middle of the top disc 15, the diameter of the B through hole 20 is consistent with the diameter of the A through hole 13, the B through hole 20 and the A through hole 13 penetrate, the partition 16 is arranged below the top disc 15, a C through hole 21 is opened in the middle of the partition 16, the diameter of the C through hole 21 is smaller than the diameter of the B through hole 20, the A through hole 13, the B through hole 20 and the C through hole 21 are connected and arranged, one end of the B spring 17 is in contact with the bottom of the partition 16, and the other end of the B spring 17 is in contact with the bottom of the partition 16. The top of the bottom disc 19 is fixedly connected, the diameter of the B spring 17 is smaller than the diameter of the A spring 8, and the bottom disc 19 is fixedly connected to the top disc 15 through the connecting column 18; the top disc 15 makes the water flow two-way control mechanism 9 fixedly connected to the valve core body 5, and the partition 16 makes the check valve in an open or closed state under the action of the positive pressure or negative pressure of the fluid, and the B spring 17 adjusts the opening or closing state of the partition 16. The connecting column 18 connects the top disc 15 and the bottom disc 19, and the bottom disc 19 provides support for the B spring 17. The A through hole 13, the B through hole 20 and the C through hole 21 are connected and arranged, so that the piston 6 can control the up and down movement of the valve core body 5 caused by pressure shock by inhaling and exhaling a small flow rate with the C through hole 21 to generate positive pressure or negative pressure in the upper inner cavity 10;There are multiple connecting posts 18, and the multiple connecting posts 18 are arranged equidistantly around the circumference.

[0025] Embodiment 7 of the present invention: A multifunctional damping check valve comprises a valve body 1, a top cover 2, a valve port 3 and a valve body inner cavity 4, wherein the top cover 2 is arranged above the valve port 3, the top cover 2 is fixedly connected to the valve body 1, the valve body inner cavity 4 is provided with a valve core body 5, the valve core body 5 is provided with a piston 6, a linear bearing 7 and an A spring 8 from top to bottom, the inner wall of the piston 6 is fixedly connected to the outer wall of the valve core body 5, the outer wall of the piston 6 is tightly fitted with the inner wall of the valve port 3, the inner wall of the linear bearing 7 is fixedly connected to the outer wall of the valve core body 5, the outer wall of the linear bearing 7 is fixedly connected to the inner wall of the valve port 3, the A spring 8 is sleeved on the outer surface of the valve core body 5, one end of the A spring 8 is fixedly connected to the bottom of the linear bearing 7, and the bottom of the valve core body 5 is provided with a water flow two-way control mechanism 9. The water flow two-way control mechanism 9 is fixedly connected to the bottom of the valve core body 5, and the water flow two-way control mechanism 9 is also fixedly connected to the other end of the A spring 8; it not only controls the movement of the valve core body 5 to reduce the wear of the valve core body 5, but also reduces the pipeline pressure shock caused by the closing of the check valve, thereby ensuring the safety of the pipeline network and increasing the service life of the check valve; the inner cavity 4 of the valve body includes an upper cavity 10 and a lower cavity 11, and an inlet 12 is arranged between the upper cavity 10 and the lower cavity 11; a through hole A 13 is provided in the center of the top of the valve core body 5; the fluid passes through the A through hole 13 to apply pressure to the partition 16, so that the partition 16 opens slowly; the outer wall of the piston 6 is provided with a double-ring sealing ring 14; the sealing effect of the piston 6 and the valve port 3 is better; the water flow two-way control mechanism 9 comprises a top disc 15, a partition 16, a B spring 17, a connecting column 18 and a bottom disc 19, wherein the top disc 15 is fixedly connected to the valve core body 5, the top disc 15 is arranged above the inlet 12, the outer diameter of the top disc 15 is larger than the outer diameter of the valve core body 5, a B through hole 20 is opened in the middle of the top disc 15, the diameter of the B through hole 20 is consistent with the diameter of the A through hole 13, the B through hole 20 and the A through hole 13 penetrate, the partition 16 is arranged below the top disc 15, a C through hole 21 is opened in the middle of the partition 16, the diameter of the C through hole 21 is smaller than the diameter of the B through hole 20, the A through hole 13, the B through hole 20 and the C through hole 21 are connected and arranged, one end of the B spring 17 is in contact with the bottom of the partition 16, and the other end of the B spring 17 is in contact with the bottom of the partition 16. The top of the bottom disc 19 is fixedly connected, the diameter of the B spring 17 is smaller than the diameter of the A spring 8, and the bottom disc 19 is fixedly connected to the top disc 15 through the connecting column 18; the top disc 15 makes the water flow two-way control mechanism 9 fixedly connected to the valve core body 5, and the partition 16 makes the check valve in an open or closed state under the action of the positive pressure or negative pressure of the fluid, and the B spring 17 adjusts the opening or closing state of the partition 16. The connecting column 18 connects the top disc 15 and the bottom disc 19, and the bottom disc 19 provides support for the B spring 17. The A through hole 13, the B through hole 20 and the C through hole 21 are connected and arranged, so that the piston 6 can control the up and down movement of the valve core body 5 caused by pressure shock by inhaling and exhaling a small flow rate with the C through hole 21 to generate positive pressure or negative pressure in the upper inner cavity 10;The connecting columns 18 are provided in multiple numbers, and the connecting columns 18 are arranged equidistantly in a circle; a ring 22 is provided at the bottom of the top disc 15, and the top of the ring 22 is fixedly connected to the bottom of the top disc 15, and the inner diameter of the ring 22 is larger than the outer diameter of the partition 16, and the outer diameter of the ring 22 is smaller than the outer diameter of the top disc 15; the partition 16 is prevented from moving left and right. ;

[0026] Embodiment 8 of the present invention: A multifunctional damping check valve comprises a valve body 1, a top cover 2, a valve port 3 and a valve body inner cavity 4, wherein the top cover 2 is arranged above the valve port 3, the top cover 2 is fixedly connected to the valve body 1, the valve body inner cavity 4 is provided with a valve core body 5, the valve core body 5 is provided with a piston 6, a linear bearing 7 and an A spring 8 from top to bottom, the inner wall of the piston 6 is fixedly connected to the outer wall of the valve core body 5, the outer wall of the piston 6 is tightly fitted with the inner wall of the valve port 3, the inner wall of the linear bearing 7 is fixedly connected to the outer wall of the valve core body 5, the outer wall of the linear bearing 7 is fixedly connected to the inner wall of the valve port 3, the A spring 8 is sleeved on the outer surface of the valve core body 5, one end of the A spring 8 is fixedly connected to the bottom of the linear bearing 7, and the bottom of the valve core body 5 is provided with a water flow two-way control mechanism 9. The water flow two-way control mechanism 9 is fixedly connected to the bottom of the valve core body 5, and the water flow two-way control mechanism 9 is also fixedly connected to the other end of the A spring 8; it not only controls the movement of the valve core body 5 to reduce the wear of the valve core body 5, but also reduces the pipeline pressure shock caused by the closing of the check valve, thereby ensuring the safety of the pipeline network and increasing the service life of the check valve; the inner cavity 4 of the valve body includes an upper cavity 10 and a lower cavity 11, and an inlet 12 is arranged between the upper cavity 10 and the lower cavity 11; a through hole A 13 is provided in the center of the top of the valve core body 5; the fluid passes through the A through hole 13 to apply pressure to the partition 16, so that the partition 16 opens slowly; the outer wall of the piston 6 is provided with a double-ring sealing ring 14; the sealing effect of the piston 6 and the valve port 3 is better; the water flow two-way control mechanism 9 comprises a top disc 15, a partition 16, a B spring 17, a connecting column 18 and a bottom disc 19, wherein the top disc 15 is fixedly connected to the valve core body 5, the top disc 15 is arranged above the inlet 12, the outer diameter of the top disc 15 is larger than the outer diameter of the valve core body 5, a B through hole 20 is opened in the middle of the top disc 15, the diameter of the B through hole 20 is consistent with the diameter of the A through hole 13, the B through hole 20 and the A through hole 13 penetrate, the partition 16 is arranged below the top disc 15, a C through hole 21 is opened in the middle of the partition 16, the diameter of the C through hole 21 is smaller than the diameter of the B through hole 20, the A through hole 13, the B through hole 20 and the C through hole 21 are connected and arranged, one end of the B spring 17 is in contact with the bottom of the partition 16, and the other end of the B spring 17 is in contact with the bottom of the partition 16. The top of the bottom disc 19 is fixedly connected, the diameter of the B spring 17 is smaller than the diameter of the A spring 8, and the bottom disc 19 is fixedly connected to the top disc 15 through the connecting column 18; the top disc 15 makes the water flow two-way control mechanism 9 fixedly connected to the valve core body 5, and the partition 16 makes the check valve in an open or closed state under the action of the positive pressure or negative pressure of the fluid, and the B spring 17 adjusts the opening or closing state of the partition 16. The connecting column 18 connects the top disc 15 and the bottom disc 19, and the bottom disc 19 provides support for the B spring 17. The A through hole 13, the B through hole 20 and the C through hole 21 are connected and arranged, so that the piston 6 can control the up and down movement of the valve core body 5 caused by pressure shock by inhaling and exhaling a small flow rate with the C through hole 21 to generate positive pressure or negative pressure in the upper inner cavity 10;The connecting columns 18 are provided in plurality, and the connecting columns 18 are arranged equidistantly in a circle; a ring 22 is provided at the bottom of the top disc 15, and the top of the ring 22 is fixedly connected to the bottom of the top disc 15, and the inner diameter of the ring 22 is larger than the outer diameter of the partition 16, and the outer diameter of the ring 22 is smaller than the outer diameter of the top disc 15; the partition 16 is prevented from moving left and right; a water drainage area 23 is provided between the ring 22 and the partition 16. ;

[0027] Embodiment 9 of the present invention: A multifunctional damping check valve comprises a valve body 1, a top cover 2, a valve port 3 and a valve body inner cavity 4, wherein the top cover 2 is arranged above the valve port 3, the top cover 2 is fixedly connected to the valve body 1, the valve body inner cavity 4 is provided with a valve core body 5, the valve core body 5 is provided with a piston 6, a linear bearing 7 and an A spring 8 from top to bottom, the inner wall of the piston 6 is fixedly connected to the outer wall of the valve core body 5, the outer wall of the piston 6 is tightly fitted with the inner wall of the valve port 3, the inner wall of the linear bearing 7 is fixedly connected to the outer wall of the valve core body 5, the outer wall of the linear bearing 7 is fixedly connected to the inner wall of the valve port 3, the A spring 8 is sleeved on the outer surface of the valve core body 5, one end of the A spring 8 is fixedly connected to the bottom of the linear bearing 7, and the bottom of the valve core body 5 is provided with a water flow two-way control mechanism 9. The water flow two-way control mechanism 9 is fixedly connected to the bottom of the valve core body 5, and the water flow two-way control mechanism 9 is also fixedly connected to the other end of the A spring 8; it not only controls the movement of the valve core body 5 to reduce the wear of the valve core body 5, but also reduces the pipeline pressure shock caused by the closing of the check valve, thereby ensuring the safety of the pipeline network and increasing the service life of the check valve; the inner cavity 4 of the valve body includes an upper cavity 10 and a lower cavity 11, and an inlet 12 is arranged between the upper cavity 10 and the lower cavity 11; a through hole A 13 is provided in the center of the top of the valve core body 5; the fluid passes through the A through hole 13 to apply pressure to the partition 16, so that the partition 16 opens slowly; the outer wall of the piston 6 is provided with a double-ring sealing ring 14; the sealing effect of the piston 6 and the valve port 3 is better; the water flow two-way control mechanism 9 comprises a top disc 15, a partition 16, a B spring 17, a connecting column 18 and a bottom disc 19, wherein the top disc 15 is fixedly connected to the valve core body 5, the top disc 15 is arranged above the inlet 12, the outer diameter of the top disc 15 is larger than the outer diameter of the valve core body 5, a B through hole 20 is opened in the middle of the top disc 15, the diameter of the B through hole 20 is consistent with the diameter of the A through hole 13, the B through hole 20 and the A through hole 13 penetrate, the partition 16 is arranged below the top disc 15, a C through hole 21 is opened in the middle of the partition 16, the diameter of the C through hole 21 is smaller than the diameter of the B through hole 20, the A through hole 13, the B through hole 20 and the C through hole 21 are connected and arranged, one end of the B spring 17 is in contact with the bottom of the partition 16, and the other end of the B spring 17 is in contact with the bottom of the partition 16. The top of the bottom disc 19 is fixedly connected, the diameter of the B spring 17 is smaller than the diameter of the A spring 8, and the bottom disc 19 is fixedly connected to the top disc 15 through the connecting column 18; the top disc 15 makes the water flow two-way control mechanism 9 fixedly connected to the valve core body 5, and the partition 16 makes the check valve in an open or closed state under the action of the positive pressure or negative pressure of the fluid, and the B spring 17 adjusts the opening or closing state of the partition 16. The connecting column 18 connects the top disc 15 and the bottom disc 19, and the bottom disc 19 provides support for the B spring 17. The A through hole 13, the B through hole 20 and the C through hole 21 are connected and arranged, so that the piston 6 can control the up and down movement of the valve core body 5 caused by pressure shock by inhaling and exhaling a small flow rate with the C through hole 21 to generate positive pressure or negative pressure in the upper inner cavity 10;The connecting columns 18 are provided with a plurality of connecting columns 18, and the plurality of connecting columns 18 are arranged equidistantly in a circle; a ring 22 is provided at the bottom of the top disc 15, and the top of the ring 22 is fixedly connected to the bottom of the top disc 15, and the inner diameter of the ring 22 is larger than the outer diameter of the partition 16, and the outer diameter of the ring 22 is smaller than the outer diameter of the top disc 15; the partition 16 is prevented from moving left and right; a water drainage area 23 is provided between the ring 22 and the partition 16; the diameter of the C through hole 21 is set according to the change of fluid density and the change of the speed of closing the multifunctional damping check valve. ;

[0028] Embodiment 10 of the present invention: A multifunctional damping check valve comprises a valve body 1, a top cover 2, a valve port 3 and a valve body inner cavity 4, wherein the top cover 2 is arranged above the valve port 3, the top cover 2 is fixedly connected to the valve body 1, the valve body inner cavity 4 is provided with a valve core body 5, the valve core body 5 is provided with a piston 6, a linear bearing 7 and an A spring 8 from top to bottom, the inner wall of the piston 6 is fixedly connected to the outer wall of the valve core body 5, the outer wall of the piston 6 is tightly fitted with the inner wall of the valve port 3, the inner wall of the linear bearing 7 is fixedly connected to the outer wall of the valve core body 5, the outer wall of the linear bearing 7 is fixedly connected to the inner wall of the valve port 3, the A spring 8 is sleeved on the valve On the outer surface of the core body 5, one end of the A spring 8 is fixedly connected to the bottom of the linear bearing 7, and a two-way water flow control mechanism 9 is arranged at the bottom of the valve core body 5, and the two-way water flow control mechanism 9 is fixedly connected to the bottom of the valve core body 5, and the two-way water flow control mechanism 9 is also fixedly connected to the other end of the A spring 8; it not only controls the movement of the valve core body 5 to reduce the wear of the valve core body 5, but also reduces the pipeline pressure shock caused by the closing of the check valve, ensures the safety of the pipeline network, and also increases the service life of the check valve; the inner cavity 4 of the valve body includes an upper inner cavity 10 and a lower inner cavity 11, and an inlet 1 is arranged between the upper inner cavity 10 and the lower inner cavity 11. 2; a through hole A 13 is provided in the center of the top of the valve core body 5; the fluid passes through the through hole A 13 to apply pressure to the partition 16, so that the partition 16 opens slowly; a double-ring sealing ring 14 is provided on the outer wall of the piston 6; the sealing effect between the piston 6 and the valve port 3 is better; the water flow two-way control mechanism 9 includes a top disc 15, a partition 16, a B spring 17, a connecting column 18 and a bottom disc 19, the top disc 15 is fixedly connected to the valve core body 5, the top disc 15 is arranged above the inlet 12, the outer diameter of the top disc 15 is larger than the outer diameter of the valve core body 5, and a through hole B 20 is provided in the middle of the top disc 15, The diameter of the B through hole 20 is consistent with the diameter of the A through hole 13, and the B through hole 20 penetrates the A through hole 13. The partition 16 is arranged below the top disk 15. A C through hole 21 is opened in the middle of the partition 16. The diameter of the C through hole 21 is smaller than the diameter of the B through hole 20. The A through hole 13, the B through hole 20 and the C through hole 21 are connected and arranged. One end of the B spring 17 fits the bottom of the partition 16, and the other end of the B spring 17 is fixedly connected to the top of the bottom disk 19. The diameter of the B spring 17 is smaller than the diameter of the A spring 8. The bottom disk 19 is fixedly connected to the top disk 15 through the connecting column 18.The top disc 15 connects the water flow two-way control mechanism 9 to the valve core body 5. The partition 16 opens or closes the check valve under the positive or negative pressure of the fluid. The B spring 17 adjusts the opening or closing state of the partition 16. The connecting column 18 connects the top disc 15 and the bottom disc 19. The bottom disc 19 provides support for the B spring 17. The A through hole 13, the B through hole 20 and the C through hole 21 are connected and arranged, so that the piston 6 controls the valve core caused by the pressure shock by the positive or negative pressure generated by the upper inner cavity 10 through the small flow in and out of the C through hole 21. The body 5 is prevented from moving up and down; three connecting columns 18 are provided, and the three connecting columns 18 are arranged equidistantly in a circle; a ring 22 is provided at the bottom of the top disc 15, and the top of the ring 22 is fixedly connected to the bottom of the top disc 15, and the inner diameter of the ring 22 is larger than the outer diameter of the partition 16, and the outer diameter of the ring 22 is smaller than the outer diameter of the top disc 15; the partition 16 is prevented from moving left and right; a water drainage area 23 is provided between the ring 22 and the partition 16; the diameter of the C through hole 21 is set according to the change of fluid density and the change of the speed of closing the multifunctional damping check valve. ;

[0029] Embodiment 11 of the present invention: A multifunctional damping check valve comprises a valve body 1, a top cover 2, a valve port 3 and a valve body inner cavity 4, wherein the top cover 2 is arranged above the valve port 3, the top cover 2 is fixedly connected to the valve body 1, the valve body inner cavity 4 is provided with a valve core body 5, the valve core body 5 is provided with a piston 6, a linear bearing 7 and an A spring 8 from top to bottom, the inner wall of the piston 6 is fixedly connected to the outer wall of the valve core body 5, the outer wall of the piston 6 is tightly fitted with the inner wall of the valve port 3, the inner wall of the linear bearing 7 is fixedly connected to the outer wall of the valve core body 5, the outer wall of the linear bearing 7 is fixedly connected to the inner wall of the valve port 3, the A spring 8 is sleeved on the valve On the outer surface of the core body 5, one end of the A spring 8 is fixedly connected to the bottom of the linear bearing 7, and a two-way water flow control mechanism 9 is arranged at the bottom of the valve core body 5, and the two-way water flow control mechanism 9 is fixedly connected to the bottom of the valve core body 5, and the two-way water flow control mechanism 9 is also fixedly connected to the other end of the A spring 8; it not only controls the movement of the valve core body 5 to reduce the wear of the valve core body 5, but also reduces the pipeline pressure shock caused by the closing of the check valve, ensures the safety of the pipeline network, and also increases the service life of the check valve; the inner cavity 4 of the valve body includes an upper inner cavity 10 and a lower inner cavity 11, and an inlet 1 is arranged between the upper inner cavity 10 and the lower inner cavity 11. 2; a through hole A 13 is provided in the center of the top of the valve core body 5; the fluid passes through the through hole A 13 to apply pressure to the partition 16, so that the partition 16 opens slowly; a double-ring sealing ring 14 is provided on the outer wall of the piston 6; the sealing effect between the piston 6 and the valve port 3 is better; the water flow two-way control mechanism 9 includes a top disc 15, a partition 16, a B spring 17, a connecting column 18 and a bottom disc 19, the top disc 15 is fixedly connected to the valve core body 5, the top disc 15 is arranged above the inlet 12, the outer diameter of the top disc 15 is larger than the outer diameter of the valve core body 5, and a through hole B 20 is provided in the middle of the top disc 15, The diameter of the B through hole 20 is consistent with the diameter of the A through hole 13, and the B through hole 20 penetrates the A through hole 13. The partition 16 is arranged below the top disk 15. A C through hole 21 is opened in the middle of the partition 16. The diameter of the C through hole 21 is smaller than the diameter of the B through hole 20. The A through hole 13, the B through hole 20 and the C through hole 21 are connected and arranged. One end of the B spring 17 fits the bottom of the partition 16, and the other end of the B spring 17 is fixedly connected to the top of the bottom disk 19. The diameter of the B spring 17 is smaller than the diameter of the A spring 8. The bottom disk 19 is fixedly connected to the top disk 15 through the connecting column 18.The top disc 15 connects the water flow two-way control mechanism 9 to the valve core body 5. The partition 16 opens or closes the check valve under the positive or negative pressure of the fluid. The B spring 17 adjusts the opening or closing state of the partition 16. The connecting column 18 connects the top disc 15 and the bottom disc 19. The bottom disc 19 provides support for the B spring 17. The A through hole 13, the B through hole 20 and the C through hole 21 are connected and arranged, so that the piston 6 controls the valve core caused by the pressure shock by the positive or negative pressure generated by the upper inner cavity 10 through the small flow in and out of the C through hole 21. The body 5 is prevented from moving up and down; there are four connecting columns 18, which are arranged equidistantly in a circle; a ring 22 is provided at the bottom of the top disc 15, the top of the ring 22 is fixedly connected to the bottom of the top disc 15, the inner diameter of the ring 22 is larger than the outer diameter of the partition 16, and the outer diameter of the ring 22 is smaller than the outer diameter of the top disc 15; the partition 16 is prevented from moving left and right; a water drainage area 23 is provided between the ring 22 and the partition 16; the diameter of the C through hole 21 is set according to the change of fluid density and the change of the speed of closing the multifunctional damping check valve. ;

[0030] Embodiment 12 of the present invention: A multifunctional damping check valve comprises a valve body 1, a top cover 2, a valve port 3 and a valve body inner cavity 4, wherein the top cover 2 is arranged above the valve port 3, the top cover 2 is fixedly connected to the valve body 1, the valve body inner cavity 4 is provided with a valve core body 5, the valve core body 5 is provided with a piston 6, a linear bearing 7 and an A spring 8 from top to bottom, the inner wall of the piston 6 is fixedly connected to the outer wall of the valve core body 5, the outer wall of the piston 6 is tightly fitted with the inner wall of the valve port 3, the inner wall of the linear bearing 7 is fixedly connected to the outer wall of the valve core body 5, the outer wall of the linear bearing 7 is fixedly connected to the inner wall of the valve port 3, the A spring 8 is sleeved on the valve On the outer surface of the core body 5, one end of the A spring 8 is fixedly connected to the bottom of the linear bearing 7, and a two-way water flow control mechanism 9 is arranged at the bottom of the valve core body 5, and the two-way water flow control mechanism 9 is fixedly connected to the bottom of the valve core body 5, and the two-way water flow control mechanism 9 is also fixedly connected to the other end of the A spring 8; it not only controls the movement of the valve core body 5 to reduce the wear of the valve core body 5, but also reduces the pipeline pressure shock caused by the closing of the check valve, ensures the safety of the pipeline network, and also increases the service life of the check valve; the inner cavity 4 of the valve body includes an upper inner cavity 10 and a lower inner cavity 11, and an inlet 1 is arranged between the upper inner cavity 10 and the lower inner cavity 11. 2; a through hole A 13 is provided in the center of the top of the valve core body 5; the fluid passes through the through hole A 13 to apply pressure to the partition 16, so that the partition 16 opens slowly; a double-ring sealing ring 14 is provided on the outer wall of the piston 6; the sealing effect between the piston 6 and the valve port 3 is better; the water flow two-way control mechanism 9 includes a top disc 15, a partition 16, a B spring 17, a connecting column 18 and a bottom disc 19, the top disc 15 is fixedly connected to the valve core body 5, the top disc 15 is arranged above the inlet 12, the outer diameter of the top disc 15 is larger than the outer diameter of the valve core body 5, and a through hole B 20 is provided in the middle of the top disc 15, The diameter of the B through hole 20 is consistent with the diameter of the A through hole 13, and the B through hole 20 penetrates the A through hole 13. The partition 16 is arranged below the top disk 15. A C through hole 21 is opened in the middle of the partition 16. The diameter of the C through hole 21 is smaller than the diameter of the B through hole 20. The A through hole 13, the B through hole 20 and the C through hole 21 are connected and arranged. One end of the B spring 17 fits the bottom of the partition 16, and the other end of the B spring 17 is fixedly connected to the top of the bottom disk 19. The diameter of the B spring 17 is smaller than the diameter of the A spring 8. The bottom disk 19 is fixedly connected to the top disk 15 through the connecting column 18.The top disc 15 connects the water flow two-way control mechanism 9 to the valve core body 5. The partition 16 opens or closes the check valve under the positive or negative pressure of the fluid. The B spring 17 adjusts the opening or closing state of the partition 16. The connecting column 18 connects the top disc 15 and the bottom disc 19. The bottom disc 19 provides support for the B spring 17. The A through hole 13, the B through hole 20 and the C through hole 21 are connected and arranged, so that the piston 6 controls the valve core caused by the pressure shock by the positive or negative pressure generated by the upper inner cavity 10 through the small flow in and out of the C through hole 21. The body 5 is prevented from moving up and down; there are five connecting columns 18, which are arranged equidistantly in a circle; a ring 22 is provided at the bottom of the top disc 15, the top of the ring 22 is fixedly connected to the bottom of the top disc 15, the inner diameter of the ring 22 is larger than the outer diameter of the partition 16, and the outer diameter of the ring 22 is smaller than the outer diameter of the top disc 15; the partition 16 is prevented from moving left and right; a water drainage area 23 is provided between the ring 22 and the partition 16; the diameter of the C through hole 21 is set according to the change of fluid density and the change of the speed of closing the multifunctional damping check valve. ;

[0031] The working principle of an embodiment of the present invention is as follows: in the working state of the present invention, the fluid flows through the lower inner cavity 11 to lift the valve core body 5, the valve core body 5 compresses the A spring 8, the valve core body 5 drives the piston 6 to move upward through the linear bearing 7, the piston 6 presses the space of the upper inner cavity 10, and the fluid in the upper inner cavity 10 moves downward through the A through hole. At this time, the partition 16 opens slowly, which effectively protects the safe start-up of the booster pump and prevents the motor from starting overload; after the partition 16 is opened, under the action of the B spring 17, the partition 16 returns to its original position, and at this time the C through hole 21 and the upper inner cavity 10 are breathing or inhaling. When the pipeline network pressure fluctuates, the piston 6 with the double-ring sealing ring 14 will inhale or exhale a small flow through the C through hole 21 connected to the upper inner cavity 10 to generate positive pressure or negative pressure in the upper inner cavity 10 to control the up and down movement of the valve core body 5 caused by the pressure fluctuation, reduce the wear of the valve core, and increase the life of the check valve.

Claims

1. A multifunctional damping check valve, It is characterized in that The invention comprises a valve body (1), a top cover (2), a valve port (3) and a valve body inner cavity (4), wherein the top cover (2) is arranged above the valve port (3), the top cover (2) is fixedly connected to the valve body (1), the valve body inner cavity (4) is provided with a valve core body (5), the valve core body (5) is provided with a piston (6), a linear bearing (7) and an A spring (8) from top to bottom, the inner wall of the piston (6) is fixedly connected to the outer wall of the valve core body (5), the outer wall of the piston (6) is tightly fitted with the inner wall of the valve port (3), the inner wall of the linear bearing (7) is fixedly connected to the outer wall of the valve core body (5), and the outer wall of the linear bearing (7) is fixedly connected to the inner wall of the valve port (3). The A spring (8) is sleeved on the outer surface of the valve core body (5), one end of the A spring (8) is fixedly connected to the bottom of the linear bearing (7), and a water flow two-way control mechanism (9) is arranged at the bottom of the valve core body (5), and the water flow two-way control mechanism (9) is fixedly connected to the bottom of the valve core body (5), and the water flow two-way control mechanism (9) is also fixedly connected to the other end of the A spring (8); the inner cavity (4) of the valve body includes an upper cavity (10) and a lower cavity (11), and an inlet (12) is arranged between the upper cavity (10) and the lower cavity (11); a through hole (13) is provided at the top center of the valve core body (5); the water flow two-way control mechanism (9) is fixedly connected to the bottom of the valve core body (5), and the water flow two-way control mechanism (9) is also fixedly connected to the other end of the A spring (8); the inner cavity (4) of the valve body includes an upper cavity (10) and a lower cavity (11), and an inlet (12) is arranged between the upper cavity (10) and the lower cavity (11); a through hole (13) is provided at the top center of the valve core body (5); The flow bidirectional control mechanism (9) comprises a top disc (15), a partition (16), a B spring (17), a connecting column (18) and a bottom disc (19), wherein the top disc (15) is fixedly connected to the valve core body (5), the top disc (15) is arranged above the inlet (12), the outer diameter of the top disc (15) is larger than the outer diameter of the valve core body (5), a B through hole (20) is opened in the middle of the top disc (15), the diameter of the B through hole (20) is consistent with the diameter of the A through hole (13), the B through hole (20) and the A through hole (13) penetrate, the partition (16) is arranged below the top disc (15), the partition (16) A C through hole (21) is opened in the middle, the diameter of the C through hole (21) is smaller than the diameter of the B through hole (20), the A through hole (13), the B through hole (20) and the C through hole (21) are arranged in communication, one end of the B spring (17) is in contact with the bottom of the partition (16), the other end of the B spring (17) is fixedly connected to the top of the bottom disc (19), the diameter of the B spring (17) is smaller than the diameter of the A spring (8), and the bottom disc (19) is fixedly connected to the top disc (15) through a connecting column (18); the diameter of the C through hole (21) is set according to the change of fluid density and the change of the speed of closing the multifunctional damping check valve.

2. A multifunctional damping check valve according to claim 1, It is characterized in that The outer wall of the piston (6) is provided with a double-ring sealing ring (14).

3. A multifunctional damping check valve according to claim 1, It is characterized in that A plurality of connecting posts (18) are provided, and the plurality of connecting posts (18) are arranged equidistantly in a circle.

4. A multifunctional damping check valve according to claim 1, It is characterized in that A circular ring (22) is provided at the bottom of the top circular disk (15), the top of the circular ring (22) is fixedly connected to the bottom of the top circular disk (15), the inner diameter of the circular ring (22) is larger than the outer diameter of the partition (16), and the outer diameter of the circular ring (22) is smaller than the outer diameter of the top circular disk (15).

5. A multifunctional damping check valve according to claim 4, It is characterized in that A water drainage area (23) is provided between the circular ring (22) and the partition plate (16).

Images