Breather valve with damper

Abstract

The embodiment of the invention provides a breather valve with a damper. The breather valve aims at solving the problem that a valve disc is frequently opened and closed under the conditions of a long ventilation pipeline and wide ventilation flow. The breather valve comprises a pressure valve and a vacuum valve, a pressure valve disc is controlled to move through a damper, quick opening and slow closing are achieved, impact between the valve disc and a valve seat is reduced, and the spark risk is reduced. The damper controls the valve disc to move through the damping hole in a throttling mode and has the characteristic of different damping forces in different directions. Vulcanized rubber is arranged on the lower surface of the valve disc to prolong the service life of the sealing face, and the valve seat is made of aluminum bronze to prevent sparks. Under abnormal conditions, the pressure valve disc can be forcibly opened through the pull ring to supplement or release pressure. The filter screen cover is made of stainless steel, and the air suction port outer cover is detachable so as to facilitate maintenance. The overall design improves the safety and durability of the breather valve.

Description

Technical Field

[0001] The present application relates to the technical field of marine breathing valves, and in particular to a breathing valve with a damper. Background Art

[0002] The breathing valve is installed at the end of the ventilation pipeline of the ship's liquid cargo tank. When the gas pressure in the oil tank exceeds the set value due to injection, transfer and external conditions (air temperature, sea water temperature, solar radiation), the gas in the liquid cargo tank will be ventilated to the outside through the breathing valve through the ventilation pipeline, or will be introduced into the liquid cargo tank through the breathing valve through the ventilation pipeline to maintain the pressure in the tank within a safe range and ensure the safety of the oil tank structure.

[0003] At present, the reference standard of breathing valves in the marine industry is "CB / T 692-1994 Oil Tank Breathing Valve", and the reference standard of breathing valves in the petrochemical industry is "SY / T0511.1-1996 Oil Storage Tank Breathing Valve", which mainly stipulates the requirements of indicators such as opening pressure and maximum air permeability, but has no requirements for the adaptable air permeability pipeline length range and the fluctuation range of air permeability. The more typical product structure is "CN103994255A Marine Breathing Valve", which uses a gravity structure to control the opening pressure. The problem is that it cannot adapt to long air permeability pipelines and wide air permeability flow conditions: when supplying to the liquid cargo tank, as the pressure in the tank increases to the exhaust pressure set by the breathing valve, when the force of the fluid on the valve disc is greater than the gravity, the pressure relief valve of the breathing valve opens, and the gas in the tank is discharged to the outside through the internal flow channel of the breather valve; when the air permeability pipeline is long, the pressure of the pressure relief valve of the breathing valve drops rapidly and cannot be replenished in time, and the pressure relief valve disc is quickly closed by gravity and hits the valve seat. At this time, if the tank loading speed is low, the pressure in the valve body will rise slowly. When the pressure relief valve opening pressure is reached, it will overcome gravity and open. The gas in the valve body will flow outward at high speed, and the pressure in the valve body will drop rapidly. The pressure relief valve disc will close rapidly under the action of gravity and hit the valve seat, causing the pressure relief valve disc to open and close frequently and collide with the valve seat, which may even cause sparks and pose a safety hazard. Summary of the invention

[0004] The invention aims to solve the problem that the valve disc of an ordinary breathing valve frequently opens and closes in the case of a long air permeation pipeline and a wide air permeation flow range, causing the valve disc to hit the valve seat.

[0005] An embodiment of the present invention provides a breathing valve with a damper, comprising:

[0006] The pressure valve comprises a valve body 1, a valve cover 2, a pressure valve disc 8, a pressure valve seat 9, a pressure valve spring 7 and a damper 15, wherein the valve cover 2 is connected to the valve body 1 by bolts, the pressure valve seat 9 is connected to the valve body 1 by threads, and the lower part of the pressure valve disc 8 can move up and down in the pressure valve seat 9 along the axial direction;

[0007] The vacuum valve comprises the valve body 1, the vacuum valve disc 13, the vacuum valve seat 12, the filter cover 11 and the vacuum valve spring 14;

[0008] The damper 15 is connected to the pressure valve disc 8 through the damper cylinder bottom thread, and the damper 15 includes a piston rod 16, a cylinder barrel 17, a cylinder bottom 18, a dust ring 19, a piston rod seal 20, a piston dynamic seal 21, a static seal 22 and a damping hole 23;

[0009] The valve stem 4 can be pulled up and down by the pull ring 3 to drive the pressure valve disc 8 to move up and down;

[0010] The spring upper plate 6 is fixed to the valve cover 2 by bolts, and the pressure valve spring 7 is in a compressed state, with one end at the spring upper plate 6 and the other end at the pressure valve plate 8, so as to maintain the opening pressure of the pressure valve;

[0011] The air inlet cover 10 is connected to the valve body 1 by bolts, the vacuum valve seat 12 is threadedly connected to the valve body 1, the filter cover 11 is installed on the air inlet cover 10, one end of the vacuum valve spring 14 is pressed against the vacuum valve disc 13, and the other end is pressed against the pressure valve seat 9.

[0012] In some embodiments, the damper 15 uses damping hole throttling to achieve damping control of the movement of the pressure valve disc 8, and the characteristic of the output damping force is that the output damping force is smaller when the piston rod 16 extends outward and the output damping force is larger when the piston rod 16 retracts inward.

[0013] In some embodiments, the pressure valve disc 8 opens quickly when reaching a predetermined pressure and closes slowly when closing, thereby ensuring rapid ventilation when reaching the opening pressure while avoiding the occurrence of frequency jumps.

[0014] In some embodiments, vulcanized rubber 24 is disposed on the lower surface of the pressure valve disc 8 to improve the stress on the valve seat 9 and extend the service life of the sealing surface.

[0015] In some embodiments, the valve seat 9 components are made of aluminum bronze to effectively prevent the generation of sparks.

[0016] In some embodiments, when the pressure in the valve body 1 increases, the pressure valve disc 8 overcomes the gravity of the valve disc and the spring force applied by the pressure valve spring 7 and moves upward, and the pressure valve opens and the gas begins to flow outward. At this time, the pressure in the valve body 1 decreases, and the pressure valve disc 8 tends to close downward. The damper 15 slows down the downward closing speed of the pressure valve disc 8 by throttling the damping hole 23.

[0017] In some embodiments, when the pressure in the valve body 1 decreases, the vacuum valve disc 13 overcomes gravity and the spring force applied by the vacuum valve spring 14 and moves upward, and the vacuum valve is opened and gas begins to flow inward.

[0018] In some embodiments, when the valve disc is abnormally stuck and causes the pressure in the valve body 1 to exceed the maximum allowable value or be lower than the minimum allowable value, the pull ring 3 is pulled upward, and the valve stem 4 drives the pressure valve disc 8 to move upward, forcing the pressure valve disc 8 to open and allow gas to flow into or out of the valve body 1, thereby achieving the effect of supplementing pressure or relieving pressure, thereby ensuring the safety of the tank.

[0019] In some embodiments, the filter cover 11 is a stainless steel filter.

[0020] In some embodiments, the air inlet cover 10 is a detachable structure to facilitate maintenance and cleaning of the filter cover 11 .

[0021] The beneficial effects of the above embodiments include:

[0022] Since a fast-opening and slow-closing damper is added to the moving parts of the breathing valve, the breathing valve pressure disc will not open and close frequently when reaching the opening pressure in the case of long air pipelines and wide air flow range, thereby reducing the impact between the valve disc and the valve seat and reducing the risk of sparks. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The drawings illustrate generally, by way of example and not limitation, various embodiments discussed herein.

[0024] Figure 1 It is a schematic diagram of the axial cross-sectional structure of the breathing valve with damping when the pressure valve is in the open state according to an embodiment of the present invention;

[0025] Figure 2 is a schematic diagram of the cross-sectional structure of the damper;

[0026] Figure 3 It is the schematic diagram of the damper oil flow;

[0027] Figure 4 It is the output force of the damping force during the opening and closing process of the pressure valve;

[0028] Figure 5 It is a schematic diagram of the sealing surface structure;

[0029] Figure 6 For the corresponding Figure 5 A schematic diagram of a partially enlarged structure of a pressure valve disc;

[0030] Figure 7 This is a typical frequency jump simulation result diagram of the control group of ordinary breathing valve without damper;

[0031] Figure 8 This is a typical frequency-free simulation calculation result diagram of the damping force output during the opening and closing process of the pressure valve.

[0032] Explanation of symbols:

[0033] 1. Valve body, 2. Valve cover, 3. Pull ring, 4. Valve stem, 5. Guide rod, 6. Spring upper plate, 7. Pressure valve spring, 8. Pressure valve disc, 9. Pressure valve seat, 10. Inlet cover, 11. Filter cover, 12. Vacuum valve seat, 13. Vacuum valve disc, 14. Vacuum valve spring, 15. Damper, 16. Piston rod, 17. Cylinder, 18. Cylinder bottom, 19. Dust ring, 20. Piston rod seal, 21. Piston dynamic seal, 22. Static seal, 23. Damping hole, 24. Vulcanized rubber. DETAILED DESCRIPTION

[0034] In order to enable a more detailed understanding of the features and technical contents of the embodiments of the present application, the implementation of the embodiments of the present application is described in detail below in conjunction with the accompanying drawings. The attached drawings are for reference only and are not used to limit the embodiments of the present application.

[0035] In the embodiments of the present application, it should be noted that, unless otherwise specified and limited, the term "connection" should be understood in a broad sense. For example, it can be an electrical connection or a connection between two components. It can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to the specific circumstances.

[0036] It should be noted that the terms "first\second\third" involved in the embodiments of the present application are only used to distinguish similar objects, and do not represent a specific order for the objects. It is understandable that the specific order or sequence of "first\second\third" can be interchanged where permitted. It should be understood that the objects distinguished by "first\second\third" can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0037] The embodiment of the present invention provides a breathing valve with a damper, which can be divided into two parts: a pressure valve and a vacuum valve. Figure 1 .like Figure 1 As shown, the valve body 1, the valve cover 2, the pressure valve disc 8, the pressure valve seat 9, the pressure valve spring 7 and the damper 15 constitute the pressure valve; the valve body 1, the vacuum valve disc 13, the vacuum valve seat 12, the filter cover 11 and the vacuum valve spring 14 constitute the vacuum valve.

[0038] The valve cover 2 is bolted to the valve body 1, the pressure valve seat 9 is threaded to the valve body 1, the lower part of the pressure valve disc 8 can move up and down in the pressure valve seat 9 along the axial direction, the damper 15 is threadedly connected to the pressure valve disc 8 through the damper cylinder bottom, and the upper part of the pressure valve disc 8 has a valve stem 4, which can be pulled up and down by the pull ring 3 to drive the pressure valve disc 8 to move up and down. The spring upper disc 6 is fixed to the valve cover 2 by bolts, and the pressure valve spring 7 is in a compressed state, with one end at the spring upper disc 6 and the other end at the pressure valve disc 8, thereby maintaining the opening pressure of the pressure valve.

[0039] The air inlet cover 10 is connected to the valve body 1 by bolts, the vacuum valve seat 12 is threadedly connected to the valve body 1, the filter cover 11 is installed on the air inlet cover 10, one end of the vacuum valve spring 14 is pressed against the vacuum valve disc 13, and the other end is pressed against the pressure valve seat 9. The air inlet cover 10 is a detachable structure to facilitate the maintenance of the filter cover 11.

[0040] The damper 15 of the pressure valve is mainly composed of a piston rod 16, a cylinder 17, a cylinder bottom 18, a dust ring 19, a piston rod seal 20, a piston dynamic seal 21, a static seal 22 and a damping hole 23. The piston rod 16 is connected to the pressure valve body 1, and the cylinder 17 moves with the pressure valve disc 8. See the schematic diagram of the damper cross-section structure. Figure 2 In some embodiments, the aperture of the damping cavity 23 can be adjusted so as to adjust the magnitude of the damping force according to actual needs.

[0041] The damper 15 uses the damping hole throttling form to realize the damping control of the pressure valve disc movement. The characteristics of the output damping force are that the output damping force is small when the piston rod extends outward and the output damping force is large when the piston rod retracts inward. When the pressure valve is opened, the pressure valve disc 8 moves upward to drive the cylinder 17 of the damper 15 to move upward, and the oil in the lower chamber of the damper enters the upper chamber through the damping hole 23 to provide damping for the upward movement of the pressure valve disc 8; when the pressure valve is closed, the pressure valve disc 8 drives the cylinder 17 of the damper 15 to move downward, and the oil in the upper chamber of the damper 15 enters the lower chamber through the damping hole 23 to provide damping for the downward movement of the pressure valve disc 8. Among them, because the oil flows to a space with a larger effective area when the valve disc is opened, the liquid flow rate flowing through the damping hole 23 during the opening process of the pressure valve disc 8 at the same speed is smaller than the speed of the valve disc closing, so the damping force provided to the movement of the pressure valve disc 8 is small, so that the pressure valve disc 8 can open quickly when it reaches a given pressure and close slowly when it closes, ensuring rapid ventilation when the opening pressure is reached while avoiding the occurrence of frequency jumps. See the schematic diagram of the oil flow of the damper 15 Figure 3 The damping force is shown in the output force of the pressure valve during opening and closing. Figure 4 .

[0042] In some embodiments, both the pressure valve disc 8 and the vacuum valve disc 13 have a quick release mechanism to quickly release pressure in an emergency.

[0043] In order to ensure the sealing performance, reduce the damage of impurities in the gas flow medium to the sealing surface during the opening and closing process of the valve disc, and reduce the impact of the instantaneous force on the valve seat sealing surface when the valve is closed, the sealing surface structure diagram is shown in Figure 5 and Figure 6 By arranging vulcanized rubber 24 on the lower surface of the pressure valve disc 8, the stress of the pressure valve seat 9 is improved and the service life of the sealing surface is extended. At the same time, aluminum bronze is selected for the pressure valve seat 9 parts that may cause impact, which effectively prevents the generation of sparks.

[0044] Since a fast-opening and slow-closing damper is added to the moving parts of the breathing valve, the breathing valve pressure disc will not open and close frequently when reaching the opening pressure in the case of long air pipelines and wide air flow range, thereby reducing the impact between the valve disc and the valve seat and reducing the risk of sparks.

[0045] Figure 8 It is a 150m long vent pipe, 800m3 tank capacity, 450m3 loading flow 3 / h condition, the pressure valve disc motion curve of the breathing valve obtained by simulation calculation. The red line is the motion trajectory of the valve disc, and the blue line is the pressure change in the cabin. Compared with the control group curve of the ordinary breathing valve without damping valve Figure 7 It can be seen that after adding the damper, the valve disc is no longer opened and closed frequently, and stable exhaust can be achieved at a certain opening.

[0046] Implementation method of the pressure valve: When the pressure in the valve body 1 increases, the pressure valve disc 8 overcomes the weight of the valve disc and the spring force applied by the pressure valve spring 7 and moves upward, and the pressure valve opens and the gas begins to flow outward. At this time, the pressure in the valve body 1 decreases, and the pressure valve disc 8 tends to close downward. The damper 15 slows down the downward closing speed of the pressure valve disc 8 by throttling the damping hole 23, so that it can be ensured that before the pressure valve disc 8 drops to the pressure valve seat 9, the pressure in the valve body 1 increases due to the loading of the liquid in the tank, so that the pressure valve disc 8 overcomes the weight of the valve disc and the spring force applied by the spring 7 and moves upward again, and the pressure valve disc 8 will not hit the pressure valve seat 9. Implementation method of the damper 15: The damper 15 adopts the form of throttling the damping hole 23 to realize the damping control of the valve disc movement. When the pressure valve is opened, the pressure valve disc 8 moves upward, driving the damper cylinder 17 to move upward, and the oil in the lower chamber of the damper enters the upper chamber through the damping hole 23, thereby providing damping for the upward movement of the valve disc; when the pressure valve is closed, the pressure valve disc 8 drives the damper cylinder 17 downward, and the oil in the upper chamber of the damper 15 enters the lower chamber through the damping hole 9, thereby providing damping for the downward movement of the valve disc. Among them, the flow rate of the liquid flowing through the damping hole 23 during the opening of the valve disc is lower than the speed of the valve disc closing, so the damping force provided to the movement of the valve disc is small, so that the pressure valve disc can open quickly when it reaches the set pressure and close slowly when it closes, ensuring rapid ventilation when the opening pressure is reached while avoiding the occurrence of frequency jumps.

[0047] Implementation method of vacuum valve: When the pressure in the valve body decreases, the vacuum valve disc 13 moves upward to overcome the gravity and the spring force applied by the vacuum valve spring 14, and the vacuum valve opens and the gas begins to flow inward. At the same time, in order to reduce the impurities entering the tank, a filter cover 11 is added outside the vacuum valve disc. After the gas begins to flow inward, the pressure in the valve body rises, and the vacuum valve disc 13 moves downward back to the vacuum valve seat 12. Here, the filter cover 11 can be made of a stainless steel filter.

[0048] Implementation method of emergency operation: When the valve disc is abnormally stuck and causes the pressure in the valve body to exceed the maximum allowable value or be lower than the minimum allowable value, pull the pull ring 3 upward, the valve stem 4 drives the pressure valve disc 8 to move upward, and the pressure valve disc 8 is forced to open to allow gas to flow into or out of the valve body, thereby achieving the effect of supplementing pressure or relieving pressure, thereby ensuring the safety of the tank.

[0049] The technical solutions described in the embodiments of the present application can be combined arbitrarily without conflict.

[0050] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A breathing valve with a damper, characterized in that: include: A pressure valve comprises a valve body (1), a valve cover (2), a pressure valve disc (8), a pressure valve seat (9), a pressure valve spring (7) and a damper (15), wherein the valve cover (2) and the valve body (1) are connected by bolts, the pressure valve seat (9) and the valve body (1) are connected by threads, and the lower part of the pressure valve disc (8) can move up and down in the pressure valve seat (9) along the axial direction; A vacuum valve, comprising the valve body (1), a vacuum valve disc (13), a vacuum valve seat (12), a filter cover (11) and a vacuum valve spring (14); The damper (15) is connected to the pressure valve disc (8) through the damper cylinder bottom thread, and the damper (15) comprises a piston rod (16), a cylinder barrel (17), a cylinder bottom (18), a dust ring (19), a piston rod seal (20), a piston dynamic seal (21), a static seal (22) and a damping hole (23); The valve stem (4) can be pulled up and down by the pull ring (3) to drive the pressure valve disc (8) to move up and down; The spring upper plate (6) is fixed to the valve cover (2) by bolts, and the pressure valve spring (7) is in a compressed state, with one end at the spring upper plate (6) and the other end at the pressure valve plate (8), so as to maintain the opening pressure of the pressure valve; The air inlet cover (10) is connected to the valve body (1) by bolts, the vacuum valve seat (12) is threadedly connected to the valve body (1), the filter cover (11) is installed on the air inlet cover (10), one end of the vacuum valve spring (14) is pressed against the vacuum valve disc (13), and the other end is pressed against the pressure valve seat (9).

2. The breathing valve with damper according to claim 1, characterized in that: The damper (15) realizes damping control of the movement of the pressure valve disc (8) in the form of damping hole throttling, and the characteristic of the output damping force is that the output damping force is smaller when the piston rod (16) extends outward, and the output damping force is larger when the piston rod (16) retracts inward.

3. The breathing valve with damper according to claim 1, characterized in that: The pressure valve disc (8) opens quickly when a predetermined pressure is reached and closes slowly when closed, thereby ensuring rapid ventilation when the opening pressure is reached while avoiding the occurrence of frequent throbbing.

4. The breathing valve with damper according to claim 1, characterized in that: The lower surface of the pressure valve disc (8) is provided with vulcanized rubber (24) to improve the force on the valve seat (9) and extend the service life of the sealing surface.

5. The breathing valve with damper according to claim 1, characterized in that: The valve seat (9) components are made of aluminum bronze, which effectively prevents the generation of sparks.

6. The breathing valve with damper according to claim 1, characterized in that: When the pressure in the valve body (1) increases, the pressure valve disc (8) overcomes the weight of the valve disc and the spring force applied by the pressure valve spring (7) and moves upward, and the pressure valve opens and the gas begins to flow outward. At this time, the pressure in the valve body (1) decreases, and the pressure valve disc (8) tends to close downward. The damper (15) slows down the downward closing speed of the pressure valve disc (8) by throttling the damping hole (23).

7. The breathing valve with a damper according to claim 1, characterized in that: When the pressure in the valve body (1) decreases, the vacuum valve disc (13) overcomes gravity and the spring force applied by the vacuum valve spring (14) and moves upward, and the vacuum valve opens and gas begins to flow inward.

8. The breathing valve with a damper according to claim 1, characterized in that: When the valve disc is abnormally stuck, causing the pressure in the valve body (1) to exceed the maximum allowable value or fall below the minimum allowable value, the pull ring (3) is pulled upward, and the valve stem (4) drives the pressure valve disc (8) to move upward, forcing the pressure valve disc (8) to open and allow gas to flow into or out of the valve body (1), thereby achieving the effect of supplementing or relieving pressure and ensuring the safety of the tank.

9. The breathing valve with a damper according to claim 1, characterized in that: The filter screen cover (11) is a stainless steel filter screen.

10. The breathing valve with a damper according to claim 1, characterized in that: The air inlet outer cover (10) is a detachable structure, so as to facilitate the maintenance and cleaning of the filter cover (11).

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