An explosion-proof sealed breather valve for use in oil tanks

Abstract

The utility model discloses an explosion -proof sealing breather valve suitable for oil tank, including casing, top cap, valve body and fire -resisting structure, the utility model discloses set up the valve body, when the pressure in the tank and outside is relatively balanced, the convex ring on the valve disc will be with the recess of fixed seat, sleeve inserts, at this time, the convex ring will extrude the sealing ring in the recess, plays the effect of sealing, can reduce the leakage of oil gas, still set up fire -resisting structure, and the fire -resisting layer is fixed in the middle by tuyere, connecting seat and casing, when needing to clean and replace the fire -resisting core in the fire -resisting layer, directly take out by rotating tuyere, then take out the fire -resisting layer, and open the cylinder cover, can take out the cleaning and replacement of the fire -resisting core filled in the fixed cylinder, finally, after the fixed cylinder of cleaning and replacement good fire -resisting core is assembled, can be reloaded in connecting seat, this process does not need to open the top cap, and the operation is simple, saves time.

Description

Technical Field

[0001] This utility model relates to the field of breather valve technology, specifically an explosion-proof sealing breather valve suitable for oil tanks. Background Technology

[0002] The breather valve for oil tanks is a ventilation device installed on the top of fixed storage tanks or oil tanks. It consists of a pressure valve and a vacuum valve, and the applicable standards include SY / T 0511.1-2010 and T / CASEI 026-2023. Its function is to regulate the pressure balance inside and outside the storage tank, reduce oil evaporation loss, and prevent external flames from entering through the flame arrestor structure. The rated control pressure of the pressure valve is typically 2 kPa, and the vacuum valve is -0.5 kPa. The positive pressure range covers 355 Pa to 1765 Pa, and the negative pressure is uniformly 295 Pa. The product shell is mostly made of cast steel, and the valve disc is sealed with stainless steel or polytetrafluoroethylene (PTFE) and equipped with an electrostatic grounding wire to achieve equipotential bonding. Based on the structure, it is divided into mechanical and pilot-operated types. During installation, it must be placed at the highest point of the gas phase space of the storage tank. Nitrogen-sealed tanks require special piping design. Routine maintenance requires cleaning the flame arrestor layer and checking the valve disc flexibility every six months.

[0003] Existing breather valves for oil tanks typically have valve discs that are in direct contact with the sleeve, leaving a large gap that can lead to oil and gas leaks. Furthermore, cleaning the flame arrestor layer inside the breather valve requires opening the top cover and removing the valve disc, which is inconvenient and time-consuming. Utility Model Content

[0004] The purpose of this invention is to provide an explosion-proof sealing breather valve suitable for oil tanks, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: an explosion-proof sealing breather valve suitable for oil tanks, comprising a shell, a top cover, a valve body, and a flame-arresting structure. The top cover is disposed at the top of the shell, and a sleeve is disposed on the right side inside the shell. The valve body is disposed inside the shell, and the top of the valve body is connected to the middle of the inside of the top cover. The flame-arresting structure is disposed at the air outlet in the middle of the right side of the shell. The valve body includes a guide rod, a negative pressure valve disc, a positive pressure valve disc, a fixing seat, a large convex ring, and a small convex ring. The top of the guide rod is connected to the middle of the inside of the top cover. The negative pressure valve disc is disposed on the upper middle side of the guide rod and contacts the top of the sleeve. The positive pressure valve disc is disposed on the lower outer side of the guide rod and contacts the bottom of the inside of the sleeve. Two sets of fixing seats are disposed on the outer side of the guide rod and are respectively located at the bottom of the two sets of valve discs and in contact with the valve discs. Two sets of large convex rings are respectively disposed on the bottom edge of the negative pressure valve disc and the positive pressure valve disc, and two sets of small convex rings are respectively disposed in the middle of the bottom of the negative pressure valve disc and the positive pressure valve disc.

[0006] Preferably, the fire-resistant structure includes a connecting seat, a fire-resistant layer, and an air outlet. The left side of the connecting seat is connected to the air outlet in the middle of the right side of the housing. The fire-resistant layer is disposed inside the connecting seat, and the left side of the fire-resistant layer is in contact with the right side of the housing. The air outlet is threadedly connected to the right side of the connecting seat.

[0007] Preferably, the fire-resistant layer includes a fixed cylinder and a cylinder cover, the outer side of the fixed cylinder is in contact with the inner side of the connecting seat, and the cylinder cover is fitted into the right side of the fixed cylinder.

[0008] Preferably, the bottom center of the fixed cylinder and the center of the cylinder cover are made of metal wire mesh, and the inside of the fixed cylinder is filled with a flame-retardant core.

[0009] Preferably, the left side of the air vent is in close contact with the cylinder cover.

[0010] Preferably, both the fixing seat and the sleeve are provided with grooves corresponding to the large convex ring and the small convex ring.

[0011] Preferably, a sealing ring is provided at the bottom of each groove.

[0012] Compared with the prior art, the beneficial effects of this utility model are: A valve body is installed. When the pressure inside and outside the tank is relatively balanced, the convex ring on the valve disc will engage with the groove on the fixed seat and sleeve. At this time, the convex ring will squeeze the sealing ring inside the groove, achieving a sealing effect and reducing oil and gas leakage. A flame arrestor structure is also installed. The flame arrestor layer is fixed in the middle by the air vent, connecting seat and shell. When it is necessary to clean and replace the flame arrestor core inside the flame arrestor layer, simply rotate the air vent to remove it, then remove the flame arrestor layer, and open the cylinder cover to remove the flame arrestor core filled inside the fixed cylinder for cleaning and replacement. Finally, the fixed cylinder with the cleaned and replaced flame arrestor core is reassembled and reinstalled into the connecting seat. This process does not require opening the top cover, is simple to operate, and saves time. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model.

[0014] Figure 2 This is a front view structural diagram of the present invention.

[0015] Figure 3 This is a schematic diagram of the valve body of this utility model.

[0016] Figure 4 This is a schematic diagram of the fire-retardant structure of this utility model.

[0017] Figure 5 This is a schematic diagram of the structure of the fixing cylinder of this utility model.

[0018] Figure 6 This is a schematic diagram of the structure of the cylindrical cover of this utility model.

[0019] In the diagram: Casing-1, Sleeve-11, Top Cover-2, Valve Body-3, Guide Rod-31, Negative Pressure Valve Disc-32, Positive Pressure Valve Disc-33, Fixing Seat-34, Large Convex Ring-35, Small Convex Ring-36, Flame Arresting Structure-4, Connecting Seat-41, Flame Arresting Layer-42, Fixing Cylinder-421, Cylinder Cover-422, Air Outlet-43. Detailed Implementation

[0020] To further explain the technical solution of this utility model, a detailed description is provided below through specific embodiments.

[0021] Please see Figures 1-2 This utility model provides an explosion-proof sealing breather valve suitable for oil tanks, including a housing 1 and a top cover 2. The top cover 2 is located at the top of the housing 1. A sleeve 11 is provided on the right side inside the housing 1. It also includes a valve body 3 and a flame arrestor structure 4. The valve body 3 is located inside the housing 1, and the top of the valve body 3 is connected to the middle of the inside of the top cover 2 to balance the air pressure inside and outside the tank. The flame arrestor structure 4 is located at the air outlet in the middle of the right side of the housing 1 to block external flames.

[0022] Please see Figure 3 This utility model provides an explosion-proof sealing breather valve suitable for oil tanks. The valve body 3 includes a guide rod 31, a negative pressure valve disc 32, a positive pressure valve disc 33, a fixing seat 34, a large convex ring 35, and a small convex ring 36. The top end of the guide rod 31 is connected to the middle of the inside of the top cover 2. The negative pressure valve disc 32 is slidably connected to the upper middle of the outer side of the guide rod 31 and is in contact with the top end of the sleeve 11. The positive pressure valve disc 33 is slidably connected to the lower outer side of the guide rod 31 and is in contact with the bottom end of the inside of the sleeve 11. Two sets of fixing seats 34 are welded to the outer side of the guide rod 31 and are respectively located at the bottom end of the two sets of valve discs 32 and are in contact with the valve discs 32. Two sets of large convex rings 35 are respectively welded to the bottom edge of the negative pressure valve disc 32 and the positive pressure valve disc 33. Two sets of small convex rings 36 are respectively welded to the middle of the bottom end of the negative pressure valve disc 32 and the positive pressure valve disc 33.

[0023] The fixed base 34 and the sleeve 11 are both provided with grooves corresponding to the large convex ring 35 and the small convex ring 36. The bottom of the groove is bonded with a sealing ring. When the large convex ring 35 and the small convex ring 36 are fitted into the groove, they will squeeze the sealing ring in the groove, reduce the gap between the convex ring and the groove, thereby providing a seal for the breather valve and reducing the loss of oil and gas when the air pressure inside and outside the oil tank is balanced.

[0024] Please see Figures 4-6This utility model provides an explosion-proof sealed breather valve suitable for oil tanks. The flame-arresting structure 4 includes a connecting seat 41, a flame-arresting layer 42, and an air outlet 43. The left side of the connecting seat 41 is connected to the air outlet in the middle of the right side of the housing 1. The flame-arresting layer 42 is embedded inside the connecting seat 41, and the left side of the flame-arresting layer 42 is in contact with the right side of the housing 1, which prevents the flame from penetrating into the breather valve. The air outlet 43 is threaded to the right side of the connecting seat 41.

[0025] The flame-arresting layer 42 includes a fixed cylinder 421 and a cylinder cover 422. The outer side of the fixed cylinder 421 contacts the inner side of the connecting seat 41. The cylinder cover 422 is fitted into the right side of the fixed cylinder 421, and the left side of the air outlet 43 is in close contact with the cylinder cover 422, thus fixing the flame-arresting layer 42 inside the connecting seat 41. At the same time, it can prevent the cylinder cover 422 from falling off from the fixed cylinder 421 during the gas entry and exit process, which would affect the flame-arresting effect. The bottom middle part of the fixed cylinder 421 and the middle part of the cylinder cover 422 are made of metal wire mesh. The inside of the fixed cylinder 421 is filled with a flame-arresting core. The metal wire mesh can play a role in cooling and dispersing the flame. Together with the internal flame-arresting core, it can quench the flame more efficiently and prevent the flame from contacting the oil and causing an explosion, thus improving safety.

[0026] Specifically, the bottom flange of the breather valve is connected to the flange on the oil tank. If the gas pressure inside the oil tank rises and reaches the positive pressure controlled by the breather valve, the positive pressure valve disc 33 is pushed upward, and the gas inside the oil tank is discharged outward through the vent. When the pressure inside and outside the oil tank returns to equilibrium, the positive pressure valve disc 33 is reset. At this time, the large convex ring 35 and the small convex ring 36 at the bottom of the positive pressure valve disc 33 are fitted into the grooves on the fixed seat 34 and the sleeve 11, and squeeze the sealing ring in the groove to achieve a sealing effect and reduce oil and gas leakage. Similarly, when the internal air pressure of the oil tank drops to the negative pressure controlled by the breather valve, the atmosphere outside the shell 1 will push open the negative pressure valve disc 32 and enter the tank. After the pressure inside and outside the oil tank returns to normal, the negative pressure valve disc 32 resets, and the large convex ring 35 and the small convex ring 36 fit into the groove to achieve a sealing effect.

[0027] When a flame outside the oil tank tries to enter the breather valve, the flame arrestor layer 42 will intercept the flame at the air inlet of the breather valve. The metal wire mesh at the bottom middle of the sleeve 421 and the middle of the cover 422 can cool and disperse the flame. Together with the flame arrestor core filled inside the sleeve 421, it can efficiently quench the flame and prevent the flame from contacting the oil and causing an explosion.

[0028] When the flame arrestor core needs to be cleaned or replaced, simply rotate the air outlet 42 to remove it, and the flame arrestor layer 42 embedded inside the connector 41 can be taken out. Then, open the cylinder cover 422 to clean and replace the flame arrestor core inside the fixed cylinder 421. This process does not require opening the top cover, making the operation simple, convenient, and time-saving.

[0029] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An explosion-proof sealing breather valve suitable for oil tanks, comprising a housing (1) and a top cover (2), wherein the top cover (2) is disposed at the top of the housing (1), and a sleeve (11) is disposed on the right side inside the housing (1), characterized in that: It also includes a valve body (3) and a flame arrestor structure (4). The valve body (3) is located inside the housing (1), and the top of the valve body (3) is connected to the middle of the top cover (2). The flame arrestor structure (4) is located at the air outlet in the middle of the right side of the housing (1). The valve body (3) includes a guide rod (31), a negative pressure valve disc (32), a positive pressure valve disc (33), a fixing seat (34), a large convex ring (35), and a small convex ring (36). The top of the guide rod (31) is connected to the middle of the top cover (2), and the negative pressure valve disc (32) is located outside the guide rod (31). The positive pressure valve disc (33) is located on the lower side of the guide rod (31) and in contact with the bottom of the sleeve (11). The two sets of fixed seats (34) are located on the outside of the guide rod (31) and are located at the bottom of the two sets of valve discs (32) respectively, and in contact with the valve discs (32). The two sets of large convex rings (35) are respectively located at the bottom edge of the negative pressure valve disc (32) and the positive pressure valve disc (33). The two sets of small convex rings (36) are respectively located at the middle of the bottom of the negative pressure valve disc (32) and the positive pressure valve disc (33).

2. The explosion-proof sealing breather valve for oil tanks according to claim 1, characterized in that: The fire-resistant structure (4) includes a connecting seat (41), a fire-resistant layer (42), and an air outlet (43). The left side of the connecting seat (41) is connected to the air outlet in the middle of the right side of the housing (1). The fire-resistant layer (42) is disposed inside the connecting seat (41), and the left side of the fire-resistant layer (42) is in contact with the right side of the housing (1). The air outlet (43) is threadedly connected to the right side of the connecting seat (41).

3. The explosion-proof sealing breather valve for oil tanks according to claim 2, characterized in that: The fire-resistant layer (42) includes a fixed cylinder (421) and a cylinder cover (422). The outer side of the fixed cylinder (421) is in contact with the inner side of the connecting seat (41), and the cylinder cover (422) is fitted on the right side of the fixed cylinder (421).

4. The explosion-proof sealing breather valve for oil tanks according to claim 3, characterized in that: The bottom middle of the fixed cylinder (421) and the middle of the cylinder cover (422) are made of metal wire mesh, and the inside of the fixed cylinder (421) is filled with a flame arrestor core.

5. The explosion-proof sealing breather valve for oil tanks according to claim 2, characterized in that: The left side of the air vent (43) is in close contact with the cylinder cover (422).

6. The explosion-proof sealing breather valve for oil tanks according to claim 1, characterized in that: The fixed base (34) and the sleeve (11) are both provided with grooves corresponding to the large convex ring (35) and the small convex ring (36).

7. The explosion-proof sealing breather valve for oil tanks according to claim 6, characterized in that: Each groove has a sealing ring at its bottom.

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