Novel low-pressure-drop pipeline flame arrester

Abstract

The utility model discloses a novel low-pressure-drop pipeline flame arrester, and relates to the technical field of flame arresters. The novel low-pressure-drop pipeline flame arrester comprises a shell and a flame arresting core, the shell comprises a first shell body and a second shell body, the first shell body and the second shell body are detachably and fixedly connected through a connecting piece, and the flame arresting core is arranged between the first shell body and the second shell body. The first shell comprises a taper pipe section and a straight pipe section, the taper pipe section is connected with the straight pipe section, and the length of the taper pipe section is larger than that of the straight pipe section. The conical pipe is of a slow reducing structure, the phenomenon of boundary layer separation can be reduced or even avoided, fluid resistance is reduced, and then the pressure drop of fluid before and after passing through the flame arrester is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of flame arresters, in particular to a novel pipeline flame arrester with low pressure drop. Background Art

[0002] Flame arresters, also known as fire preventers, flame isolators, and flame arresters, are composed of solid materials containing numerous tiny channels or slits. They are safety devices that prevent the passage of flames while allowing the flow of gases and liquids. Flame arresters are typically installed in tanks and pipelines that transport or discharge flammable and explosive gases. They can suppress the spread of flames in their early stages of development, or even effectively suppress a detonation if one occurs. They are widely used in various storage tanks and pipelines transporting flammable gases in industries such as petroleum, chemical, mining, and transportation.

[0003] Currently, most common flame arresters use a symmetrical inlet and outlet structure, with both inlet and outlet sections being butt-welded to an elliptical head or using a socket structure to reduce the diameter. When flow field simulations were performed on the butt-welded and socket structures, both exhibited significant boundary layer separation and backflow. Chinese patent document CN110314306A discloses a bidirectional detonation arrester comprising a shell, two shells, a fire arrester assembly disposed between the shells, a shock wave absorber disposed between the shells and the fire arrester assembly, and a buffer chamber disposed within the shell. The detonation shock wave is decompressed and decelerated in the buffer chamber, protecting the fire arrester components. The flame arrester shell disclosed in this patent document is a common socket-welded flame arrester shell on the market. Rapid diameter reduction can cause the fluid boundary layer to separate from the inner boundary of the flame arrester shell. According to Bernoulli's equation, as the pipe diameter increases, the fluid velocity decreases, the kinetic energy decreases, and the pressure potential energy increases. Backflow occurs after the boundary layer separation point, increasing the fluid flow resistance and increasing the pressure drop as the fluid passes through the flame arrester, resulting in significant pressure drop losses at the inlet and outlet of the flame arrester. Utility Model Content

[0004] Aiming at the problem that the existing flame arrester has boundary layer separation and backflow caused by rapid diameter change, and the resulting in inlet and outlet pressure drop loss, the utility model provides a new pipeline flame arrester with low pressure drop.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] A new low-pressure-drop pipeline flame arrester includes a shell and a flame arrester core. The shell includes a first shell and a second shell. The first shell and the second shell are detachably and fixedly connected by a connecting piece. The flame arrester core is arranged between the first shell and the second shell. The first shell includes a tapered pipe section and a straight pipe section. The tapered pipe section is connected to the straight pipe section. The length of the tapered pipe section is greater than the length of the straight pipe section.

[0007] Furthermore, the tapered tube section is in a conical shape, and the straight tube section is in a straight tube shape.

[0008] Furthermore, the tapered pipe section is located outside the straight pipe section, and the large end of the tapered pipe section is fixedly connected to the straight pipe section.

[0009] Furthermore, sealing gaskets are provided between the fire-retardant core and the first shell and the second shell.

[0010] Furthermore, the connecting piece includes a hexagonal nut and a fully threaded stud, the hexagonal nut and the fully threaded stud are adapted for threaded connection, and flat washers are provided between the hexagonal nut and the first shell and the second shell.

[0011] Furthermore, the small end of the conical tube section and the second shell are both fixedly connected with a connecting pipe, and the connecting pipe has a flange.

[0012] Furthermore, the second shell is in a straight tube shape, and the second shell is narrowed in an arc shape at a position adjacent to the connecting pipe.

[0013] Furthermore, a plurality of connecting pipes are fixed on the first shell and the second shell, and a pipe plug is provided in each connecting pipe.

[0014] The beneficial effects of the present invention are as follows: the tapered tube in the present invention is a slowly varying diameter structure, which can reduce or even avoid boundary layer separation, reduce fluid resistance, and further reduce the pressure drop before and after the fluid passes through the flame arrester. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 Shown is a schematic diagram of the structural principle of an embodiment of the present utility model.

[0016] Figure 2 Shown Figure 1 Cross-sectional view at point A in the middle. DETAILED DESCRIPTION

[0017] The utility model discloses a novel pipeline flame arrester with low pressure drop. An implementation manner of the utility model is described in detail below with reference to the accompanying drawings.

[0018] like Figure 1As shown, the new low-pressure-drop pipeline flame arrester includes a first shell 2, a second shell 9, and a fire arrester core 3. The first shell 2 and the second shell 9 are detachably fixedly connected by a connector. The fire arrester core 3 is located between the first shell 2 and the second shell 9, and a sealing gasket 4 is provided between the fire arrester core 3 and the first shell 2 and the second shell 9. The sealing gasket 4 is used to achieve a tight connection between the fire arrester core 3 and the first shell 2 and the second shell 9 to prevent leakage of the medium. The connector includes a hexagonal nut 6 and a fully threaded stud 7. The fully threaded stud 7 is adapted to be inserted between the first shell 2 and the second shell 9, and both ends of the fully threaded stud 7 are adapted to be threadedly connected to the hexagonal nut 6. Flat washers 5 are provided at the contact positions between the hexagonal nut 6 and the first shell 2 and the second shell 9.

[0019] like Figure 2 As shown, the first housing 2 includes a tapered tube section 201 and a straight tube section 202. The tapered tube section 201 is conical, and the straight tube section 202 is straight. The length of the tapered tube section 201 is greater than that of the straight tube section 202. The tapered tube section 201 is located outside the straight tube section 202, and the large end of the tapered tube section 201 is welded to the straight tube section 202. The second housing 9 is a straight tube. The small end of the tapered tube section 201 and the second housing 9 are both fixedly connected to the connecting tube 1. The connecting tube 1 has a flange. The second housing 9 is narrowed in an arc shape near the connecting tube 1, forming a closed end. The diameter of the closed end is the same as the inner diameter of the connecting tube 1. Several connecting tubes are fixed to the first housing 2 and the second housing 9, and each connecting tube is provided with a pipe plug 8.

[0020] The tapered tube in the present invention is a slowly varying diameter structure, which can reduce or even avoid the occurrence of boundary layer separation, reduce fluid resistance, and further reduce the pressure drop before and after the fluid passes through the flame arrester.

[0021] Of course, the above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Changes, modifications, additions or substitutions made by technicians in this technical field within the essential scope of the present invention should also fall within the scope of protection of the present invention.

Claims

1. A new type of low pressure drop pipeline flame arrester, characterized by: The invention comprises a shell and a fire-stop core (3), wherein the shell comprises a first shell (2) and a second shell (9), wherein the first shell (2) and the second shell (9) are detachably fixedly connected via a connecting piece, and the fire-stop core (3) is arranged between the first shell (2) and the second shell (9), and the first shell (2) comprises a tapered tube section (201) and a straight tube section (202), wherein the tapered tube section (201) is connected to the straight tube section (202), and the length of the tapered tube section (201) is greater than the length of the straight tube section (202); The conical tube section (201) is located outside the straight tube section (202), and the large end of the conical tube section (201) is fixedly connected to the straight tube section (202); The small end of the conical tube section (201) and the second shell (9) are both fixedly connected to a connecting pipe (1), and the connecting pipe (1) has a flange; The second shell (9) is in the shape of a straight tube, and the second shell (9) is narrowed in an arc shape at a position adjacent to the connecting tube (1).

2. The novel low pressure drop pipeline flame arrester according to claim 1, characterized in that: The tapered tube section (201) is in a conical shape, and the straight tube section (202) is in a straight tube shape.

3. The novel low pressure drop pipeline flame arrester according to claim 1, characterized in that: Sealing gaskets (4) are provided between the fire-retardant core (3) and the first shell (2) and the second shell (9).

4. The novel low pressure drop pipeline flame arrester according to claim 1, characterized in that: The connecting piece comprises a hexagonal nut (6) and a fully threaded stud (7), wherein the hexagonal nut (6) and the fully threaded stud (7) are adapted to be threadedly connected, and a flat washer (5) is provided between the hexagonal nut (6) and the first shell (2) and the second shell (9).

5. The novel low pressure drop pipeline flame arrester according to claim 1, characterized in that: A plurality of connecting pipes are fixed on the first shell (2) and the second shell (9), and a pipe plug (8) is provided in each connecting pipe.

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