Axial flow type check valve

Abstract

The utility model relates to the technical field of check valves, in particular to an axial flow type check valve which comprises a valve body, a valve seat is fixedly connected to the surface of the valve body, a fixing rod is fixedly connected to the surface of the valve body, a flow guide body is fixedly connected to the surface of the fixing rod, a guide plate is fixedly connected to the surface of the flow guide body, and the valve seat and the fixing rod are fixedly connected to the surface of the valve body. A spring is fixedly connected to the surface of the guide plate, a valve clack is fixedly connected to the surface of the spring, and a valve rod is fixedly connected to the surface of the valve clack. The valve clack drives the piston to slide in the buffer cylinder through the connecting rod, the piston pushes a water source of the buffer cylinder in the buffer cylinder, so that the water source of the buffer cylinder is discharged through the water outlet, the water source in the buffer cylinder limits the speed of closing the valve by the valve clack through the buffer cylinder, and therefore the valve clack is prevented from impacting a valve seat in the valve body; the safety of the sealing surfaces of the valve clack and the valve seat is guaranteed, and the safety of the valve is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of check valves, in particular to an axial flow check valve. Background Art

[0002] An axial flow check valve is a valve that uses the axial flow characteristics of the fluid to prevent the reverse flow of the fluid. It is mainly used in one-way flow pipeline systems, such as pipelines for conveying fluids such as water, oil, and gas.

[0003] When the existing check valve is transporting water in a pipeline system, the closing speed of the valve is affected by the spring pre-compression force, valve fluid dynamics and other design factors. When the valve closes too quickly, the valve disc will hit the valve seat, causing damage to the sealing surface between the valve disc and the valve seat, reducing the sealing performance of the valve and shortening the service life of the valve. Utility Model Content

[0004] The utility model aims to provide an axial flow check valve to solve the problem raised in the above background technology that when the valve is closed too quickly, the valve disc will hit the valve seat, causing damage to the sealing surface of the valve disc and the valve seat, reducing the sealing performance of the valve and shortening the service life of the valve.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solution, an axial flow check valve: comprising a valve body, a valve seat fixedly connected to the surface of the valve body, a fixing rod fixedly connected to the surface of the valve body, a guide body fixedly connected to the surface of the fixing rod, a guide plate fixedly connected to the surface of the guide body, a spring fixedly connected to the surface of the guide plate, a valve flap fixedly connected to the surface of the spring, a valve stem fixedly connected to the surface of the valve flap, the valve stem slidably connected to the surface of the guide plate, a buffer mechanism is arranged on the surface of the valve body, the buffer mechanism comprises a support rod, the support rod is fixedly connected to the surface of the valve body, a buffer cylinder is fixedly connected to the surface of the support rod, a connecting rod is fixedly connected to the surface of the valve flap, a piston is fixedly connected to the surface of the connecting rod, and a drain port is provided on the surface of the buffer cylinder.

[0006] Preferably, a protective mechanism is provided on the surface of the flow guide, and the protective mechanism includes a fixing ring, the fixing ring is fixedly connected to the surface of the flow guide, a first sealing ring is fixedly connected to the surface of the fixing ring, a protective tube is fixedly connected to the surface of the valve disc, an extrusion ring is fixedly connected to the surface of the protective tube, and a second sealing ring is fixedly connected to the surface of the flow guide.

[0007] Preferably, two groups of support rods are provided, and the support rods support the buffer cylinder on the inner surface of the valve body, and the support rods and the buffer cylinder are perpendicular to each other.

[0008] Preferably, the support rod is located at the center of the valve body, the connecting rod is fixedly connected to the center of the valve disc, a guide groove is provided on the surface of the buffer cylinder, and the piston slides on the guide groove of the buffer cylinder.

[0009] Preferably, a drainage hole is provided on the guide groove of the buffer cylinder, and the drainage hole of the buffer cylinder is located at an end of the buffer cylinder away from the valve disc.

[0010] Preferably, the inner ring and outer ring of the fixing ring, the first sealing ring and the extrusion ring have the same diameter, the extrusion ring slides on the outer surface of the flow guide body through the protective tube, and the extrusion ring squeezes the first sealing ring on the fixing ring.

[0011] Preferably, the second sealing ring is fixedly connected to one end of the guide body close to the valve flap, and the valve flap squeezes the second sealing ring on the guide body.

[0012] Compared with the prior art, the beneficial effects of the utility model are:

[0013] 1. For this check valve, before the valve is closed, the buffer cylinder is filled with water through the drain port. When the valve is closed, the valve disc slides inside the valve body to the surface of the valve seat. The valve disc drives the piston to slide inside the buffer cylinder through the connecting rod. The piston pushes the water source in the buffer cylinder inside the buffer cylinder, so that the water source in the buffer cylinder is discharged through the drain port. The water source inside the buffer cylinder limits the speed of the valve disc closing the valve through the buffer cylinder, thereby avoiding the valve disc from hitting the valve seat inside the valve body, ensuring the safety of the sealing surface of the valve disc and the valve seat, and ensuring the safety of the valve.

[0014] 2. For the check valve, when the valve is closed, the valve disc drives the extrusion ring to slide on the surface of the guide body through the protective tube, so that the extrusion ring squeezes the first sealing ring on the fixed ring, and the first sealing ring seals the guide body and the protective tube between the fixed ring and the extrusion ring, thereby preventing the water source from soaking the spring; when the valve is opened, the valve disc squeezes the second sealing ring on the guide body, and the second sealing ring seals between the valve disc and the guide body, thereby preventing the spring from being soaked and extending the service life of the spring. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a front view and cutaway perspective diagram of the structure of the utility model;

[0016] Figure 2 It is a schematic diagram of a side cutaway perspective view of the structure of the utility model;

[0017] Figure 3 For this utility model Figure 2 A schematic diagram of the enlarged structure at A in the middle;

[0018] Figure 4It is a front view and a sectional perspective schematic diagram of the buffer mechanism of the utility model;

[0019] Figure 5 For this utility model Figure 4 Schematic diagram of the enlarged structure at point B in the middle.

[0020] In the figure: 1. valve body; 11. valve seat; 12. fixing rod; 13. guide body; 14. guide plate; 15. spring; 16. valve disc; 17. valve stem; 2. support rod; 21. buffer cylinder; 22. connecting rod; 23. piston; 24. drain port; 3. fixing ring; 31. first sealing ring; 32. protective tube; 33. extrusion ring; 34. second sealing ring. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] See also Figure 1-5 , an embodiment provided by the utility model:

[0023] An axial flow check valve: comprising a valve body 1, a valve seat 11 is fixedly connected to the surface of the valve body 1, a fixing rod 12 is fixedly connected to the surface of the valve body 1, a guide body 13 is fixedly connected to the surface of the fixing rod 12, a guide plate 14 is fixedly connected to the surface of the guide body 13, a spring 15 is fixedly connected to the surface of the guide plate 14, a valve disc 16 is fixedly connected to the surface of the spring 15, the elastic force of the spring 15 acts on the valve disc 16, a valve stem 17 is fixedly connected to the surface of the valve disc 16, the valve stem 17 is slidably connected to the surface of the guide plate 14, when the valve disc 16 is pressed on the valve seat 11, the valve is in a closed state, when the valve disc 16 is pressed on the guide body 13, the valve is in an open state, a buffer mechanism is arranged on the surface of the valve body 1, and the buffer mechanism includes a support The support rod 2 is fixedly connected to the surface of the valve body 1, a buffer cylinder 21 is fixedly connected to the surface of the support rod 2, a connecting rod 22 is fixedly connected to the surface of the valve disc 16, a piston 23 is fixedly connected to the surface of the connecting rod 22, a drain port 24 is provided on the surface of the buffer cylinder 21, and its buffer mechanism can store an appropriate water source inside the buffer cylinder 21, and the valve disc 16 will drive the piston 23 to squeeze the water source inside the buffer cylinder 21 through the connecting rod 22 during the process of closing the valve, and discharge the water source inside the buffer cylinder 21 through the drain port 24. Due to the resistance of the water source, the speed of closing the valve by the valve disc 16 is slowed down, thereby preventing the valve disc 16 from hitting the valve seat 11 inside the valve body 1, thereby ensuring the safety of the sealing surface of the valve disc 16 and the valve seat 11.

[0024] Furthermore, a protective mechanism is provided on the surface of the flow guide 13, and the protective mechanism includes a fixing ring 3, the fixing ring 3 is fixedly connected to the surface of the flow guide 13, a first sealing ring 31 is fixedly connected to the surface of the fixing ring 3, a protective tube 32 is fixedly connected to the surface of the valve disc 16, an extrusion ring 33 is fixedly connected to the surface of the protective tube 32, and a second sealing ring 34 is fixedly connected to the surface of the flow guide 13. The protective mechanism can seal and protect the spring 15 inside the valve body 1 when the valve is opened and closed, so as to prevent the spring 15 from being soaked by water, thereby extending the service life of the spring 15 inside the valve body 1.

[0025] Furthermore, two groups of support rods 2 are provided, and the support rods 2 support the buffer cylinder 21 on the inner surface of the valve body 1 , and the support rods 2 and the buffer cylinder 21 are perpendicular to each other.

[0026] Furthermore, the support rod 2 is at the center of the valve body 1, the connecting rod 22 is fixedly connected to the center of the valve disc 16, a guide groove is provided on the surface of the buffer cylinder 21, and the piston 23 slides on the guide groove of the buffer cylinder 21. When the valve is in the open state, the buffer cylinder 21 fills the interior of the buffer cylinder 21 with water through the drain port 24. When the valve is closed, the piston 23 slides on the guide groove of the buffer cylinder 21 to squeeze the water source.

[0027] Furthermore, a drainage hole is provided on the guide groove of the buffer cylinder 21. The drainage hole of the buffer cylinder 21 is located at the end of the buffer cylinder 21 away from the valve flap 16, and the size of the drain port 24 is relatively small. It takes a while for the drain port 24 to completely discharge the water inside the buffer cylinder 21. The valve flap 16 drives the drain port 24 to squeeze the water inside the buffer cylinder 21 through the connecting rod 22, and discharges the water inside the buffer cylinder 21 through the drain port 24.

[0028] Furthermore, the inner and outer rings of the fixing ring 3, the first sealing ring 31 and the extrusion ring 33 have the same diameter, and the extrusion ring 33 slides on the outer surface of the guide body 13 through the protective tube 32. When the valve is closed, the extrusion ring 33 squeezes the first sealing ring 31 on the fixing ring 3, and the first sealing ring 31 seals the guide body 13 and the protective tube 32 between the fixing ring 3 and the extrusion ring 33, thereby preventing the water source from soaking the spring 15.

[0029] Furthermore, the second sealing ring 34 is fixedly connected to one end of the guide body 13 close to the valve disc 16. When the valve is opened, the valve disc 16 squeezes the second sealing ring 34 on the guide body 13. The second sealing ring 34 seals between the valve disc 16 and the guide body 13, thereby preventing the spring 15 from being soaked.

[0030] Working principle: before the valve is closed, the buffer cylinder 21 is filled with water through the drain port 24. When the valve is closed, the valve flap 16 slides inside the valve body 1 to the surface of the valve seat 11. The valve flap 16 drives the piston 23 to slide inside the buffer cylinder 21 through the connecting rod 22. The piston 23 pushes the water source of the buffer cylinder 21 inside the buffer cylinder 21, so that the water source of the buffer cylinder 21 is discharged through the drain port 24. The water source inside the buffer cylinder 21 limits the speed at which the valve flap 16 closes the valve through the buffer cylinder 21, thereby preventing the valve flap 16 from hitting the valve seat 11 inside the valve body 1, ensuring the safety of the sealing surface of the valve flap 16 and the valve seat 11, and ensuring the safety of the valve.

[0031] When the valve is closed, the valve disc 16 drives the extrusion ring 33 to slide on the surface of the guide body 13 through the protective tube 32, so that the extrusion ring 33 squeezes the first sealing ring 31 on the fixed ring 3, and the first sealing ring 31 seals the guide body 13 and the protective tube 32 between the fixed ring 3 and the extrusion ring 33, thereby preventing the water source from soaking the spring 15. When the valve is opened, the valve disc 16 squeezes the second sealing ring 34 on the guide body 13, and the second sealing ring 34 seals between the valve disc 16 and the guide body 13, thereby preventing the spring 15 from being soaked and extending the service life of the spring 15.

[0032] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

Claims

1. An axial flow check valve, characterized in that: The valve body (1) comprises a valve seat (11) fixedly connected to the surface of the valve body (1), a fixing rod (12) fixedly connected to the surface of the valve body (1), a guide body (13) fixedly connected to the surface of the fixing rod (12), a guide plate (14) fixedly connected to the surface of the guide body (13), a spring (15) fixedly connected to the surface of the guide plate (14), a valve flap (16) fixedly connected to the surface of the spring (15), and a valve stem (17) fixedly connected to the surface of the valve flap (16). The valve stem (17) is slidably connected to the surface of the guide plate (14); a buffer mechanism is arranged on the surface of the valve body (1); the buffer mechanism comprises a support rod (2); the support rod (2) is fixedly connected to the surface of the valve body (1); a buffer cylinder (21) is fixedly connected to the surface of the support rod (2); a connecting rod (22) is fixedly connected to the surface of the valve flap (16); a piston (23) is fixedly connected to the surface of the connecting rod (22); and a drain port (24) is provided on the surface of the buffer cylinder (21).

2. An axial flow check valve according to claim 1, characterized in that: A protective mechanism is provided on the surface of the flow guide (13), the protective mechanism comprising a fixing ring (3), the fixing ring (3) being fixedly connected to the surface of the flow guide (13), a first sealing ring (31) being fixedly connected to the surface of the fixing ring (3), a protective tube (32) being fixedly connected to the surface of the valve flap (16), an extrusion ring (33) being fixedly connected to the surface of the protective tube (32), and a second sealing ring (34) being fixedly connected to the surface of the flow guide (13).

3. An axial flow check valve according to claim 1, characterized in that: Two groups of support rods (2) are provided. The support rods (2) support the buffer cylinder (21) on the inner surface of the valve body (1). The support rods (2) and the buffer cylinder (21) are perpendicular to each other.

4. An axial flow check valve according to claim 3, characterized in that: The support rod (2) is located at the center of the valve body (1), the connecting rod (22) is fixedly connected to the center of the valve disc (16), a guide groove is provided on the surface of the buffer cylinder (21), and the piston (23) slides on the guide groove of the buffer cylinder (21).

5. An axial flow check valve according to claim 4, characterized in that: A drainage hole is provided on the guide groove of the buffer cylinder (21), and the drainage hole of the buffer cylinder (21) is located at an end of the buffer cylinder (21) away from the valve flap (16).

6. An axial flow check valve according to claim 2, characterized in that: The inner and outer rings of the fixing ring (3), the first sealing ring (31) and the extrusion ring (33) have the same diameter; the extrusion ring (33) slides on the outer surface of the guide body (13) through the protective tube (32); and the extrusion ring (33) squeezes the first sealing ring (31) on the fixing ring (3).

7. An axial flow check valve according to claim 6, characterized in that: The second sealing ring (34) is fixedly connected to one end of the guide body (13) close to the valve flap (16), and the valve flap (16) presses the second sealing ring (34) on the guide body (13).

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