A negative pressure safety relief device for a storage tank

Abstract

The utility model discloses a kind of negative pressure type safety relief device for storage tank, belong to the technical field of storage tank safety accessory, including storage tank body, further include: fixedly installed in the pressure relief pipe of the side surface of the storage tank body;Through the cooperation use between above each device, by the setting of relief mechanism, when the pressure inside storage tank body is lower than outside, atmospheric pressure overcomes the tension of tension spring, sliding baffle is slid along fixed rod to pressure relief plate direction, when sliding baffle moves from small radius section to large radius section, it is relieved with the close fit of pressure relief pipe inner wall, at the same time, first plug-in block inserts slot, form unobstructed air passage, air is imported into tank by pressure relief pipe import, fast balance tank negative pressure, after tank pressure restores normal, tension spring returns sliding baffle to small radius section, resealing device, effectively reduce the phenomenon that storage tank body is locally even whole concave due to negative pressure.

Description

Technical Field

[0001] This utility model relates to the field of safety accessories for storage tanks, specifically a negative pressure safety relief device for storage tanks. Background Technology

[0002] Storage tanks are used to store refined chemical substances such as acids, alkalis, alcohols, gases, and liquids. In North China, storage tanks are widely used. According to the material, they are mainly divided into polyethylene storage tanks, polypropylene storage tanks, fiberglass storage tanks, ceramic storage tanks, rubber storage tanks, and stainless steel storage tanks. In terms of cost performance, steel-lined polyethylene storage tanks are currently the most superior. They have excellent corrosion resistance, high strength, and long service life. The appearance can be designed in various types such as vertical, horizontal, transport, and mixing.

[0003] If the pump is used to pump liquid too quickly and the air supply is insufficient, a vacuum will form inside the existing storage tank. In addition, when high-temperature steam or volatile liquid inside the tank condenses upon cooling, the gas volume will decrease sharply, which will also cause the pressure inside the tank to drop sharply and form a negative pressure. At this time, the atmospheric pressure outside the tank is much higher than the internal pressure. Thin-walled storage tanks may be partially or even completely dented, which may cause the equipment to become unusable and result in high economic losses.

[0004] Therefore, this utility model provides a negative pressure safety relief device for storage tanks to solve the above problems. Utility Model Content

[0005] This invention provides a negative pressure safety relief device for storage tanks, aiming to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a negative pressure safety relief device for a storage tank, comprising a storage tank body, and further comprising: a pressure relief pipe fixedly installed on the side surface of the storage tank body, a first fixing frame fixedly installed on the inner wall of one end of the pressure relief pipe, a second fixing frame fixedly installed on the inner wall of the end of the pressure relief pipe away from the first fixing frame, a fixing rod fixedly installed between the first fixing frame and the second fixing frame, and a relief mechanism disposed inside the pressure relief pipe for automatic safety relief.

[0007] The venting mechanism includes a sliding block plate slidably mounted on the side surface of the fixed rod, a pressure relief plate fixedly mounted on the side surface of the fixed rod, a tension spring sleeved on the side surface of the fixed rod, a first insert block fixedly mounted on one side of the sliding block plate, and a slot formed inside the pressure relief plate for the first insert block to be inserted into.

[0008] Preferably, the side surface of the sliding block is in contact with the inner wall of the pressure relief pipe, the sliding block is elastically connected to one side of the first fixing frame by a tension spring, and multiple first inserts are provided, which are arranged in a ring array on one side of the sliding block.

[0009] Preferably, the end of the pressure relief pipe away from the tank body is provided with an installation groove, a filter plate is slidably connected inside the installation groove, and sliding grooves are provided on both sides of the inner wall of the installation groove.

[0010] Preferably, a slide rod is slidably connected inside the slide groove, and a second insert block is slidably connected inside the slide groove, with one end of the slide rod fixedly connected to one side of the second insert block.

[0011] Preferably, a second spring is sleeved on the side surface of the slide rod, and the second insert is fixedly connected to the inner wall of one side of the slide groove through the second spring, and one side of the second insert is in contact with one side of the filter plate.

[0012] Preferably, a pad is provided inside the mounting groove, and a first spring is provided inside the mounting groove. The pad is elastically connected to one side of the mounting groove through the first spring.

[0013] Preferably, the side of the pad away from the first spring is in contact with the side of the filter plate away from the second insert.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0015] This utility model has a simple structure and is easy to use. Through the setting of the venting mechanism, when the internal pressure of the storage tank is lower than that of the outside, the atmospheric pressure overcomes the tension of the tension spring and pushes the sliding block plate to slide along the fixed rod towards the pressure relief plate. When the sliding block plate moves from the small radius section to the large radius section, it releases the tight fit with the inner wall of the pressure relief pipe. At the same time, the first insert block is inserted into the slot to form an unobstructed air passage. Air then enters the tank through the pressure relief pipe inlet, quickly balancing the negative pressure inside the tank. After the pressure inside the tank returns to normal, the tension spring pulls the sliding block plate back to the small radius section, resealing the device. This effectively reduces the phenomenon of local or even overall inward concavity of the storage tank body due to negative pressure. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model;

[0017] Figure 2 This is a cross-sectional schematic diagram of the pressure relief pipe in this utility model;

[0018] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0019] Figure 4 This is a schematic diagram of the installation of the sliding blocking plate in this utility model;

[0020] Figure 5 This is a cross-sectional schematic diagram of the sliding groove in this utility model;

[0021] Figure 6 for Figure 5 Enlarged view of point B in the middle;

[0022] Figure 7 This is a schematic diagram of the installation of the filter plate in this utility model.

[0023] In the picture:

[0024] 1. Tank body; 2. Pressure relief pipe; 3. First fixing frame; 4. Second fixing frame; 5. Fixing rod; 6. Sliding blocking plate; 7. Pressure relief plate; 8. Tension spring; 9. First insert block; 10. Slot; 11. Mounting groove; 12. Pad plate; 13. First spring; 14. Filter plate; 15. Slide groove; 16. Slide rod; 17. Second insert block; 18. Second spring; 19. Discharge mechanism. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] like Figures 1 to 7 As shown, this utility model provides a negative pressure safety relief device for storage tanks. The negative pressure safety relief device for storage tanks includes a storage tank body 1, and further includes: a pressure relief pipe 2 fixedly installed on the side surface of the storage tank body 1, a first fixing frame 3 fixedly installed on the inner wall of one end of the pressure relief pipe 2, a second fixing frame 4 fixedly installed on the inner wall of the end of the pressure relief pipe 2 away from the first fixing frame 3, a fixing rod 5 fixedly installed between the first fixing frame 3 and the second fixing frame 4, and a relief mechanism 19 disposed inside the pressure relief pipe 2 for automatic safety relief.

[0027] The venting mechanism 19 includes a sliding block 6 slidably mounted on the side surface of the fixed rod 5, a pressure relief plate 7 fixedly mounted on the side surface of the fixed rod 5, a tension spring 8 sleeved on the side surface of the fixed rod 5, a first insert 9 fixedly mounted on one side of the sliding block 6, and a slot 10 opened inside the pressure relief plate 7 for the first insert 9 to be inserted into.

[0028] The side surface of the sliding block 6 is in contact with the inner wall of the pressure relief pipe 2. The sliding block 6 is elastically connected to one side of the first fixed frame 3 through the tension spring 8. Multiple first inserts 9 are provided, and the first inserts 9 are arranged in a ring array on one side of the sliding block 6.

[0029] Using the above scheme: When the negative pressure safety relief device for the storage tank is in use, when a negative pressure is formed inside the storage tank body 1 due to medium extraction, temperature drop, etc., the external atmospheric pressure will push the sliding block 6 to slide along the fixed rod 5 away from the first fixed frame 3. At this time, the tension spring 8 is compressed and undergoes elastic deformation. The pressure relief pipe 2 is divided into two parts with a smaller radius and a larger radius. The sliding block 6 is at the end with the smaller radius. As the sliding block 6 moves, it moves from the end with the smaller radius to the end with the larger radius. At the same time, the first insert 9 will be inserted into the slot 10. At this time, it and the pressure relief plate 7... An annular air channel is formed between the two, and outside air enters through the inlet of the pressure relief pipe 2 and flows rapidly into the interior of the storage tank body 1 through this channel, gradually balancing the negative pressure inside the tank. After the pressure inside the tank returns to the normal range, the elastic restoring force of the tension spring 8 will pull the sliding block plate 6 to move in the opposite direction along the fixed rod 5. The side surface of the sliding block plate 6 will once again fit tightly against the inner wall of the pressure relief pipe 2 with a smaller radius, restoring the sealing state of the device and ensuring the safety of medium storage in the storage tank under non-negative pressure conditions. The whole process does not require manual intervention. The automatic release of negative pressure and sealing reset are achieved through the elastic linkage of the mechanical structure, effectively ensuring the operational stability of the storage tank.

[0030] like Figure 1 , Figure 2 , Figure 6 and Figure 7 As shown, in order to facilitate the installation and disassembly of the filter plate 14, the end of the pressure relief pipe 2 away from the tank body 1 is provided with an installation groove 11, the filter plate 14 is slidably connected inside the installation groove 11, and the inner walls on both sides of the installation groove 11 are provided with sliding grooves 15.

[0031] A slide rod 16 is slidably connected inside the slide groove 15, and a second insert block 17 is slidably connected inside the slide groove 15. One end of the slide rod 16 is fixedly connected to one side of the second insert block 17.

[0032] A second spring 18 is fitted on the side surface of the slide rod 16. The second insert 17 is fixedly connected to the inner wall of one side of the slide groove 15 through the second spring 18. One side of the second insert 17 is in contact with one side of the filter plate 14.

[0033] Using the above scheme: When using the negative pressure safety relief device for the storage tank, if the filter plate 14 needs to be installed, simply align it with the mounting groove 11 and press it down. The two lugs of the filter plate 14 will first contact the inclined surface of the second insert 17, and then the two second inserts 17 will be pressed outward. When the filter plate 14 is pressed further until it is out of contact range with the second inserts 17, the elastic restoring force of the second spring 18 will push the second inserts 17 to slide in the opposite direction along the slide groove 15, and finally lock the filter plate 14. If the filter plate 14 needs to be disassembled for cleaning or replacement, simply pull the slide rod 16 away from the filter plate to disengage the second inserts 17 from the filter plate, and it can be easily pulled out from the mounting groove 11. The filter plate 14 can effectively filter dust, particles, debris and other impurities in the outside air, preventing them from entering the interior of the storage tank body 1 with the replenished air, and further enhancing the device's protection capability for the storage tank.

[0034] like Figure 1 , Figure 6 and Figure 7 As shown, in order to facilitate the automatic pop-out of the filter plate 14 when it is disassembled, a pad 12 is provided inside the mounting groove 11, and a first spring 13 is provided inside the mounting groove 11. The pad 12 is elastically connected to one side of the mounting groove 11 through the first spring 13.

[0035] The side of the pad 12 away from the first spring 13 is in contact with the side of the filter plate 14 away from the second insert 17.

[0036] By adopting the above solution: When the negative pressure safety relief device for storage tanks is in use, when the sliding rod 16 is pulled to disengage the second insert 17 from the filter plate 14, the elastic restoring force of the first spring 13 will push the pad 12 to move out of the mounting groove 11, thereby pushing the filter plate 14 out of the mounting groove 11. The user can easily remove the filter plate 14, which effectively solves the problem of the filter plate 14 being difficult to disassemble due to being stuck, and further improves the convenience of device maintenance.

[0037] Working principle and usage process of this utility model:

[0038] When this negative pressure safety relief device for storage tanks is in use, it is initially in a normal sealed state: the sliding plug 6, under the elastic tension of the tension spring 8, tightly adheres to the inner wall of the smaller radius section of the pressure relief pipe 2, ensuring that the internal medium of the storage tank 1 will not leak, and that outside air cannot enter without permission. When the internal pressure of the storage tank 1 is lower than the external atmospheric pressure due to medium extraction, temperature drop, or other reasons, the external atmospheric pressure will overcome the tension of the tension spring 8, pushing the sliding plug 6 to slide along the fixed rod 5 towards the pressure relief plate 7. As the sliding plug 6 moves from the smaller radius section to the larger radius section of the pressure relief pipe 2, the adhesion between its side surface and the inner wall of the pressure relief pipe is released, and the sliding plug... The first insert 9 on one side of plate 6 is accurately inserted into the slot 10 on pressure relief plate 7. At this time, an annular air circulation channel is formed between sliding block plate 6 and pressure relief plate 7. Outside air enters through the inlet of pressure relief pipe 2, first passes through filter plate 14 to filter out dust, particles and other impurities, and then flows quickly into the tank body 1 through this channel, gradually balancing the negative pressure inside the tank. When the pressure inside the tank returns to the normal working range, the elastic potential energy of tension spring 8 pulls sliding block plate 6 to slide in the opposite direction along fixed rod 5, returning to the small radius section of pressure relief pipe 2. Its side surface is once again tightly attached to the inner wall of the small radius section, re-sealing the device and preventing leakage of medium inside the tank or entry of outside air without necessary filtration.

[0039] When a lot of impurities are found on the surface of the filter plate 14, it needs to be cleaned or replaced. At this time, simply pull the slide bar 16 away from the filter plate 14 by hand. The slide bar 16 drives the second insert block 17 to slide along the slide groove 15, compressing the second spring 18 and causing the second insert block 17 to disengage from the ear plate of the filter plate 14. As the limit of the second insert block 17 is released, the first spring 13 in the mounting groove 11 will push the pad 12 to move out of the mounting groove. The pad 12 will then push the filter plate 14 out of the mounting groove 11. The user can directly grab the protruding part of the filter plate 14 by hand and pull it out of the mounting groove 11. After cleaning or replacing the filter plate 14, align it with the mounting groove 11 and press it. The ear plate of the filter plate 14 presses the inclined surface of the second insert block 17, causing the second insert block 17 to retract. After the filter plate 14 is fully inserted into the mounting groove 11, the second spring 18 pushes the second insert block 17 to reset and re-secure the filter plate 14, completing the maintenance operation.

[0040] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0041] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A negative pressure safety relief device for a storage tank, comprising a storage tank body (1), characterized in that: Also includes: The pressure relief pipe (2) is fixedly installed on the side surface of the tank body (1), the first fixing frame (3) is fixedly installed on the inner wall of one end of the pressure relief pipe (2), the second fixing frame (4) is fixedly installed on the inner wall of the end of the pressure relief pipe (2) away from the first fixing frame (3), the fixing rod (5) is fixedly installed between the first fixing frame (3) and the second fixing frame (4), and the release mechanism (19) is provided inside the pressure relief pipe (2) for automatic and safe release; The venting mechanism (19) includes a sliding block (6) slidably mounted on the side surface of the fixed rod (5), a pressure relief plate (7) fixedly mounted on the side surface of the fixed rod (5), a tension spring (8) sleeved on the side surface of the fixed rod (5), a first insert (9) fixedly mounted on one side of the sliding block (6), and a slot (10) opened inside the pressure relief plate (7) for the first insert (9) to be inserted.

2. The negative pressure safety relief device for storage tanks according to claim 1, characterized in that: The side surface of the sliding block (6) is in contact with the inner wall of the pressure relief pipe (2). The sliding block (6) is elastically connected to one side of the first fixing frame (3) by a tension spring (8). Multiple first inserts (9) are provided, and the first inserts (9) are arranged in a ring array on one side of the sliding block (6).

3. The negative pressure safety relief device for storage tanks according to claim 1, characterized in that: The pressure relief pipe (2) has an installation groove (11) at one end away from the tank body (1). A filter plate (14) is slidably connected inside the installation groove (11). Sliding grooves (15) are provided on both sides of the inner wall of the installation groove (11).

4. The negative pressure safety relief device for storage tanks according to claim 3, characterized in that: A slide rod (16) is slidably connected inside the slide groove (15), and a second insert block (17) is slidably connected inside the slide groove (15). One end of the slide rod (16) is fixedly connected to one side of the second insert block (17).

5. The negative pressure safety relief device for storage tanks according to claim 4, characterized in that: The slide bar (16) is fitted with a second spring (18) on its side surface. The second insert (17) is fixedly connected to the inner wall of one side of the slide groove (15) through the second spring (18). One side of the second insert (17) is in contact with one side of the filter plate (14).

6. The negative pressure safety relief device for storage tanks according to claim 5, characterized in that: A pad (12) is provided inside the mounting groove (11), and a first spring (13) is provided inside the mounting groove (11). The pad (12) is elastically connected to one side of the mounting groove (11) through the first spring (13).

7. The negative pressure safety relief device for storage tanks according to claim 6, characterized in that: The side of the pad (12) away from the first spring (13) is in contact with the side of the filter plate (14) away from the second insert (17).

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