Nitrogen injection device for oil tank of gas station

Abstract

The utility model discloses a gas station oil tank nitrogen injection device which comprises an oil tank body, a gas inlet pipe penetrates through a gas inlet, nitrogen enters the oil tank body along the gas inlet pipe, oil gas in the oil tank body is completely exhausted, and the oil tank body is cleaned. The end, located in the oil tank body, of the gas inlet pipe is connected with a gas acceleration cavity, the gas acceleration cavity is of a circular-truncated-cone-shaped cavity structure, when nitrogen enters the oil tank body through the gas inlet pipe, the nitrogen passes through the gas acceleration cavity, the caliber of the gas acceleration cavity is gradually reduced from top to bottom, and under the equal pressure, the nitrogen injection speed is increased in the gas acceleration cavity; nitrogen molecules can be more rapidly diffused in the tank when obtaining larger kinetic energy, so that the oil gas replacement efficiency is effectively improved; and the side wall of the gas accelerating cavity is evenly connected with the gas outlet pipes, the nitrogen is exhausted into the oil tank body from the multiple gas outlet pipes after being accelerated, exhausting is more uniform, the nitrogen diffusion comprehensiveness is improved, and the oil gas replacement efficiency is further improved.

Description

Technical Field

[0001] The utility model relates to the technical field of oil tank nitrogen injection devices, in particular to a gas station oil tank nitrogen injection device. Background Art

[0002] Before the construction and renovation of a gas station, in order to avoid fire and explosion caused by the diffusion of oil and gas in the oil tank, the tank must be cleaned in advance to ensure the safe progress of the renovation work. The traditional method is mainly to inject water into the oil tank to avoid the risk of fire and explosion, but this method will produce a large amount of hazardous waste, which is not conducive to environmental protection. At the same time, the cost of treating hazardous waste is expensive. Research practice has shown that inert gases have a good inhibitory effect on combustion and explosion. Nitrogen is used to inertate and replace oil and gas in oil tanks due to its stable properties, easy preparation, and low price. Existing nitrogen injection devices generally use ordinary pipelines to provide a channel for nitrogen to enter the oil tank. When nitrogen enters the oil tank from the pipeline at equal pressure, the injection speed is limited, resulting in poor diffusion of nitrogen in the oil tank. The efficiency of replacing oil and gas needs to be improved. For this reason, a nitrogen injection device for gas station oil tanks is proposed. Utility Model Content

[0003] The purpose of the utility model is to provide a nitrogen injection device for oil tanks in gas stations to solve the problems raised in the above background technology.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a gas station oil tank nitrogen injection device, comprising an oil tank body, wherein the oil tank body is provided with a gas inlet and a gas outlet, wherein the gas inlet and the gas outlet are respectively used for the entry and discharge of replacement gas in the oil tank, a gas inlet pipe is passed through the gas inlet, and one end of the gas inlet pipe located outside the oil tank body is connected to a nitrogen source, and nitrogen enters the oil tank body along the gas inlet pipe, exhausts the oil and gas in the oil tank body, and cleans the oil tank body, and one end of the gas inlet pipe located inside the oil tank body is connected to a gas acceleration chamber, wherein the gas acceleration chamber is a truncated cone-shaped chamber structure, and the upper end of the gas acceleration chamber is connected to the upper end of the gas acceleration chamber. The upper end of the gas acceleration chamber is connected to the gas inlet pipe, and the lower end of the gas acceleration chamber is a closed end. When the nitrogen enters the oil tank body through the gas inlet pipe, it passes through the gas acceleration chamber. The diameter of the gas acceleration chamber gradually decreases from top to bottom. Under isobaric conditions, the nitrogen injection speed is improved in the gas acceleration chamber. The nitrogen molecules gain greater kinetic energy and can diffuse more rapidly in the tank, thereby effectively improving the efficiency of replacing oil and gas. The side walls of the gas acceleration chamber are evenly connected with outlet pipes. After acceleration, the nitrogen is discharged into the oil tank body from multiple outlet pipes. The discharge is more uniform, which increases the comprehensiveness of nitrogen diffusion and further improves the efficiency of replacing oil and gas.

[0005] Preferably, the gas outlet pipe includes a connecting section, one end of the connecting section is connected to the gas acceleration chamber, the other end of the connecting section is connected to one end of the acceleration section, and the other end of the acceleration section is connected to the gas outlet section. In the process of the nitrogen being accelerated by the gas acceleration chamber and discharged into the oil tank body along the gas outlet pipe, the nitrogen is accelerated again by the acceleration section and ejected, thereby further increasing the diffusion rate of the nitrogen in the oil tank body.

[0006] Preferably, the connecting section and the accelerating section are integrally connected, and the accelerating section and the air outlet section are integrally connected. The integrally formed connection ensures that the air outlet pipe is solid and reliable as a whole.

[0007] Preferably, the acceleration section gradually reduces in diameter along the axial direction, wherein the diameter of the connection port between the acceleration section and the connection section is larger than the connection end between the acceleration section and the outlet section. The acceleration section gradually reduces in diameter so that the nitrogen gas flow velocity increases continuously under constant pressure.

[0008] Preferably, the caliber of the connecting section is equal to the large-diameter port diameter of the acceleration section, and the caliber of the air outlet section is equal to the small-diameter port diameter of the acceleration section. The connecting section, the acceleration section and the air outlet section are connected in sequence, and the equal-caliber setting facilitates the overall molding of the air outlet pipe.

[0009] Preferably, the gas outlet is connected to a gas outlet pipe, and the gas outlet pipe is provided with a valve for controlling the flow rate of the exhaust gas, and the oil gas and excess nitrogen are discharged along the gas outlet pipe.

[0010] Preferably, the gas inlet tube is rotationally connected to the gas acceleration chamber, a first connecting ring is provided through the upper side wall of the gas acceleration chamber, a second connecting ring is fixedly connected to the inside of the gas inlet tube, the first connecting ring and the second connecting ring are rotationally connected via a bearing, a rotating rod is coaxially provided inside the first connecting ring, and a spiral fan blade is fixedly connected to the outer rear surface of the rotating rod.

[0011] Preferably, a connecting tube is provided inside the rotating rod, the upper end of the connecting tube is fixedly connected to the air inlet hood, and the connecting tube is fixedly connected to the inner wall of the gas inlet tube through a number of connecting rods, and the lower end of the connecting tube passes through the lower side wall of the gas acceleration chamber and is fixedly connected to a connecting shell, and the outer side wall of the connecting shell is provided with an air blowing port.

[0012] Compared with the prior art, the beneficial effects of the present invention are:

[0013] (1) A gas inlet pipe runs through the gas inlet port, and one end of the gas inlet pipe located outside the oil tank body is connected to a nitrogen source. Nitrogen enters the oil tank body along the gas inlet pipe, exhausts the oil and gas in the oil tank body, and cleans the oil tank body. The gas inlet pipe is connected to a gas acceleration chamber at one end located inside the oil tank body. The gas acceleration chamber is a truncated cone-shaped chamber structure. The upper end of the gas acceleration chamber is a large-diameter end, and the lower end of the gas acceleration chamber is a small-diameter end. The upper end of the gas acceleration chamber is connected to the gas inlet pipe, and the lower end of the gas acceleration chamber is a closed end. When nitrogen enters the oil tank body through the gas inlet pipe, it passes through the gas acceleration chamber. The diameter of the gas acceleration chamber gradually decreases from top to bottom. Under constant pressure, the nitrogen injection speed is improved in the gas acceleration chamber. The nitrogen molecules gain greater kinetic energy and can diffuse more rapidly in the tank, thereby effectively improving the efficiency of replacing oil and gas.

[0014] (2) The side walls of the gas acceleration chamber are evenly connected with gas outlet pipes. After being accelerated, the nitrogen is discharged from multiple gas outlet pipes into the oil tank body. The discharge is more uniform, which increases the comprehensiveness of nitrogen diffusion and further improves the efficiency of oil and gas replacement. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the main structure of Example 1 of the utility model;

[0016] Figure 2 This is embodiment 1 of the utility model Figure 1 A in the middle is an enlarged schematic diagram;

[0017] Figure 3 This is a schematic diagram of the gas acceleration chamber and the gas outlet pipe structure of Example 1 of the present utility model;

[0018] Figure 4 This is a schematic diagram of the main cross-sectional structure of the gas acceleration chamber in Example 2 of the present utility model.

[0019] In the figure: 1-oil tank body, 2-gas inlet, 3-gas outlet, 4-gas inlet pipe, 5-gas acceleration chamber, 6-outlet pipe, 601-connecting section, 602-acceleration section, 603-outlet section, 7-gas outlet pipe, 8-first connecting ring, 9-second connecting ring, 10-rotating rod, 11-spiral fan blade, 12-connecting pipe, 13-air inlet cover, 14-connecting shell, 15-blowing port. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0021] Example 1:

[0022] See also Figure 1-3 The utility model provides the following technical solutions: a gas station oil tank nitrogen injection device, comprising an oil tank body 1, the oil tank body 1 is provided with a gas inlet port 2 and a gas outlet port 3, the gas inlet port 2 and the gas outlet port 3 are respectively used for the entry and discharge of replacement gas in the oil tank, a gas inlet pipe 4 is passed through the gas inlet port 2, the gas inlet pipe 4 and one end located outside the oil tank body 1 is connected to a nitrogen source, nitrogen enters the oil tank body 1 along the gas inlet pipe 4, exhausts the oil and gas in the oil tank body 1, and cleans the oil tank body 1, the gas inlet pipe 4 and one end located inside the oil tank body 1 is connected to a gas acceleration chamber 5, the gas acceleration chamber 5 is a truncated cone-shaped cavity structure, the upper end of the gas acceleration chamber 5 The upper end of the gas acceleration chamber 5 is connected to the gas inlet pipe 4, and the lower end of the gas acceleration chamber 5 is a closed end. When the nitrogen enters the oil tank body 1 through the gas inlet pipe 4, it passes through the gas acceleration chamber 5. The diameter of the gas acceleration chamber 5 gradually decreases from top to bottom. Under isobaric conditions, the nitrogen injection speed is improved in the gas acceleration chamber 5. The nitrogen molecules gain greater kinetic energy and can diffuse more rapidly in the tank, thereby effectively improving the efficiency of replacing oil and gas. The side walls of the gas acceleration chamber 5 are evenly connected with outlet pipes 6. After acceleration, the nitrogen is discharged from multiple outlet pipes 6 into the oil tank body 1. The discharge is more uniform, which increases the comprehensiveness of nitrogen diffusion and further improves the efficiency of replacing oil and gas.

[0023] Specifically, the outlet pipe 6 includes a connecting section 601, one end of which is connected to the gas acceleration chamber 5, and the other end of the connecting section 601 is connected to one end of the acceleration section 602, and the other end of the acceleration section 602 is connected to the outlet section 603. After the nitrogen is accelerated by the gas acceleration chamber 5 and discharged into the oil tank body 1 along the outlet pipe 6, it is accelerated again by the acceleration section 602 and ejected, further increasing the diffusion rate of the nitrogen in the oil tank body 1.

[0024] Specifically, the connecting section 601 and the accelerating section 602 are integrally connected, and the accelerating section 602 and the air outlet section 603 are integrally connected. The integrally formed connection ensures that the air outlet pipe 6 is solid and reliable as a whole.

[0025] Specifically, the acceleration section 602 gradually reduces in diameter along the axial direction, wherein the diameter of the connection port between the acceleration section 602 and the connection section 601 is larger than the connection end between the acceleration section 602 and the outlet section 603. The acceleration section 602 gradually reduces in diameter so that the nitrogen gas flow velocity increases continuously under constant pressure.

[0026] Specifically, the diameter of the connecting section 601 is equal to the diameter of the large-diameter port of the acceleration section 602, and the diameter of the air outlet section 603 is equal to the diameter of the small-diameter port of the acceleration section 602. The connecting section 601, the acceleration section 602 and the air outlet section 603 are connected in sequence. The equal-diameter setting facilitates the overall formation of the air outlet pipe 6.

[0027] Specifically, the gas outlet 3 is connected to a gas outlet pipe 7 , and a valve for controlling the flow rate of the exhaust gas is provided on the gas outlet pipe 7 . Oil, gas and excess nitrogen are discharged along the gas outlet pipe 7 .

[0028] Working principle: A gas inlet 2 and a gas outlet 3 are provided on the oil tank body 1. The gas inlet 2 and the gas outlet 3 are used for the entry and discharge of the replacement gas in the oil tank respectively. A gas inlet pipe 4 runs through the gas inlet 2. The end of the gas inlet pipe 4 located outside the oil tank body 1 is connected to the nitrogen source. Nitrogen enters the oil tank body 1 along the gas inlet pipe 4, exhausts the oil and gas in the oil tank body 1, and cleans the oil tank body 1. The end of the gas inlet pipe 4 located inside the oil tank body 1 is connected to a gas acceleration chamber 5. The gas acceleration chamber 5 is a truncated cone-shaped cavity structure. The upper end of the gas acceleration chamber 5 is a large-diameter end, and the lower end of the gas acceleration chamber 5 is a small-diameter end. The upper end of the gas acceleration chamber 5 is connected to the gas inlet pipe 4, and the lower end of the gas acceleration chamber 5 is a closed end. When the nitrogen enters the oil tank body 1 through the gas inlet pipe 4, it passes through the gas acceleration chamber 5. The diameter of the gas acceleration chamber 5 gradually decreases from top to bottom. Under constant pressure, the nitrogen injection speed is improved in the gas acceleration chamber 5. The nitrogen molecules gain greater kinetic energy and can diffuse more rapidly in the tank, thereby effectively improving the efficiency of replacing oil and gas. The side walls of the gas acceleration chamber 5 are evenly connected with outlet pipes 6. After acceleration, the nitrogen is discharged from multiple outlet pipes 6 into the oil tank body 1. The discharge is more uniform, which increases the comprehensiveness of nitrogen diffusion and further improves the efficiency of replacing oil and gas.

[0029] Example 2

[0030] See also Figure 4The difference between this embodiment and embodiment 1 is that the gas inlet pipe 4 and the gas acceleration chamber 5 are rotatably connected. Figure 4 As shown, a first connecting ring 8 is provided through the upper side wall of the gas acceleration chamber 5, and a second connecting ring 9 is fixedly connected to the inside of the gas inlet tube 4. The second connecting ring 9 is located inside the first connecting ring 8 and is coaxially arranged. The first connecting ring 8 and the second connecting ring 9 are rotatably connected through a bearing to realize the rotational connection between the gas acceleration chamber 5 and the gas inlet tube 4. A rotating rod 10 is coaxially provided inside the first connecting ring 8, and a spiral fan blade 11 is fixedly connected to the outer rear face of the rotating rod 10. The rotating rod 10 can be fixed in the first connecting ring 8 by a rod, and the extension direction of the rotating rod 10 is extended in the same direction as the axis of the first connecting ring 8. When the gas is blown into the gas acceleration chamber 5 from the gas inlet tube 4, the gas flows through the spiral fan blade 11, driving the rotating rod 10 to rotate. The rotating rod 10 drives the first connecting ring 8 to rotate, so that the gas acceleration chamber 5 can be rotated, and the gas can be ejected more evenly.

[0031] Specifically, a connecting pipe 12 is provided for the internal rotation of the rotating rod 10, and the connecting pipe 12 is coaxially arranged with the rotating rod 10. The upper end of the connecting pipe 12 is fixedly connected to an air intake hood 13, and the air intake hood 13 is funnel-shaped, and the connecting pipe 12 is fixedly connected to the inner wall of the gas inlet pipe 4 through a number of connecting rods. The lower end of the connecting pipe 12 passes through the lower side wall of the gas acceleration chamber 5 and is fixedly connected to a connecting shell 14. The outer wall of the connecting shell 14 is provided with an air blowing port 15. The gas blown in by the gas inlet pipe 4 is blown into the inside of the connecting pipe 12 by the air intake hood 13 and blown out at high speed from the air blowing port 15 on the bottom connecting shell 14. The gas inlet pipe 4 is made of flexible pipe fittings. Since the gas inlet pipe 4 is located at one end inside the oil tank body 1, when the gas is blown out from the air blowing port 15, it can drive the gas inlet pipe 4 to bend, so that the gas acceleration chamber 5 moves to the center of the oil tank body 1, so that the gas is more evenly filled into the oil tank body 1.

[0032] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0033] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein with equivalents. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A nitrogen injection device for a gas station oil tank, comprising an oil tank body (1), wherein the oil tank body (1) is provided with a gas inlet (2) and a gas outlet (3), and characterized in that: A gas inlet pipe (4) runs through the gas inlet port (2), and one end of the gas inlet pipe (4) located in the oil tank body (1) is connected to a gas acceleration chamber (5). The gas acceleration chamber (5) is a truncated cone-shaped cavity structure, the upper end of the gas acceleration chamber (5) is a large-diameter end, and the lower end of the gas acceleration chamber (5) is a small-diameter end. The upper end of the gas acceleration chamber (5) is connected to the gas inlet pipe (4), and the lower end of the gas acceleration chamber (5) is a closed end. The side wall of the gas acceleration chamber (5) is evenly connected with an outlet pipe (6).

2. The nitrogen injection device for oil tanks at gas stations according to claim 1, characterized in that: The gas outlet pipe (6) comprises a connecting section (601), one end of the connecting section (601) is connected to the gas acceleration chamber (5), the other end of the connecting section (601) is connected to one end of the acceleration section (602), and the other end of the acceleration section (602) is connected to the gas outlet section (603).

3. The nitrogen injection device for oil tanks at gas stations according to claim 2, characterized in that: The connecting section (601) and the accelerating section (602) are integrally connected, and the accelerating section (602) and the air outlet section (603) are integrally connected.

4. A gas station oil tank nitrogen injection device according to claim 3, characterized in that: The acceleration section (602) gradually reduces its axial diameter, wherein the diameter of the connection port between the acceleration section (602) and the connection section (601) is larger than the connection end between the acceleration section (602) and the air outlet section (603).

5. The nitrogen injection device for oil tanks at gas stations according to claim 4, characterized in that: The caliber of the connecting section (601) is equal to the caliber of the large-caliber port of the acceleration section (602), and the caliber of the air outlet section (603) is equal to the caliber of the small-caliber port of the acceleration section (602).

6. The nitrogen injection device for oil tanks at gas stations according to claim 1, characterized in that: The gas outlet (3) is connected to a gas outlet pipe (7), and the gas outlet pipe (7) is provided with a valve for controlling the flow rate of the exhaust gas.

7. The nitrogen injection device for oil tanks at gas stations according to claim 5, characterized in that: The gas inlet pipe (4) is rotatably connected to the gas acceleration chamber (5); a first connecting ring (8) is provided through the upper side wall of the gas acceleration chamber (5); a second connecting ring (9) is fixedly connected to the inside of the gas inlet pipe (4); the first connecting ring (8) and the second connecting ring (9) are rotatably connected via a bearing; a rotating rod (10) is coaxially provided inside the first connecting ring (8); and a spiral blade (11) is fixedly connected to the outer rear surface of the rotating rod (10).

8. The nitrogen injection device for oil tanks at gas stations according to claim 7, characterized in that: A connecting tube (12) is provided inside the rotating rod (10), the upper end of the connecting tube (12) is fixedly connected to an air inlet cover (13), and the connecting tube (12) is fixedly connected to the inner wall of the gas inlet tube (4) through a plurality of connecting rods. The lower end of the connecting tube (12) passes through the lower side wall of the gas acceleration chamber (5) and is fixedly connected to a connecting shell (14), and the outer side wall of the connecting shell (14) is provided with an air blowing port (15).

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