A nonwoven fabric spinning and spreading equipment

Abstract

This utility model relates to a nonwoven fabric spinning and spreading device, belonging to the technical field of nonwoven fabric processing equipment. The nonwoven fabric spinning and spreading device includes: a pressure-reducing nozzle; a yarn-aligning assembly facing the outlet of the pressure-reducing nozzle; and a multi-component housing comprising a spinning box, a channel cavity, and an airflow combing zone arranged vertically from top to bottom. The pressure-reducing nozzle and the yarn-aligning assembly are located within the spinning box. The channel cavity is connected to the spinning box and the airflow combing zone at its upper and lower ends, respectively. The airflow combing zone is connected to the spinning box via a connecting pipe. The pressure-reducing nozzle includes a spinning channel, within which a pressure-reducing chamber inlet, a pressure-reducing chamber, and a pressure-reducing chamber outlet are arranged horizontally in sequence. This nonwoven fabric spinning and spreading device can achieve airflow self-circulation, combing the turbulent airflow during the yarn distribution process, achieving controllable backflow, significantly improving the spinning spreading rate, and effectively improving web laying efficiency and uniformity.

Description

Technical Field

[0001] This utility model relates to a nonwoven fabric spinning and spreading equipment, belonging to the technical field of nonwoven fabric processing equipment. Background Technology

[0002] Flash-spun polyethylene nonwoven fabric is made from high-density polyethylene as raw material. A uniform spinning solution is prepared under high temperature and pressure conditions, and then sprayed from a depressurized nozzle to obtain continuous ultrafine fibers. These ultrafine fibers are then oscillated into a web and thermally rolled to form the polyethylene nonwoven fabric. Flash-spun nonwoven fabric, composed of continuous ultrafine fibers, endows it with excellent mechanical properties, waterproof properties, and breathability.

[0003] Flash-processed nonwoven fabrics are formed by a continuous fiber web of a certain width oscillating in a regular pattern to create a single sheet of nonwoven fabric of a certain width. Along the thickness of the nonwoven fabric, dozens of layers of fiber webs arranged in different directions are stacked together. The structure and properties of each layer of the fiber web are crucial to the barrier properties of the flash-processed nonwoven fabric.

[0004] Patent CN115142142B discloses a nozzle and a flash spinning device equipped with the nozzle. The flash spinning device includes a reaction vessel, a spinning disc, and a flash spinning nozzle. The flash spinning nozzle is connected to the outlet of the reaction vessel, allowing the spinning solution to flow out of the reaction vessel, enter the depressurization chamber through the depressurization port, and then flow out of the nozzle onto the spinning disc. The refraction and oscillation of the spinning disc refract and disperse the fiber bundle into a mesh-like fiber sheet. The rapid rotation and oscillation of the spinning disc then repeatedly lays the fiber mesh onto a moving screen below it. However, during operation, the fiber bundles in this flash spinning device primarily move downwards due to gravity, which is detrimental to the combing of the fiber bundles and may affect the uniformity of the final nonwoven fabric. Patent CN205974958U discloses a nonwoven fabric composite web forming device, including an airflow splitter and a composite fiber mechanism. The output end of the airflow splitter is equipped with a swaying roller; a web forming curtain is positioned directly below the swaying roller; a suction mechanism is positioned directly below the web forming curtain; the composite fiber mechanism includes an atomizing nozzle mounted above the web forming curtain. The atomizing nozzle atomizes the fiber slurry, which then adheres quickly and tightly to the web forming curtain due to gravity and suction. This nonwoven fabric composite web forming device achieves rapid and efficient web forming through the suction effect of the suction mechanism. However, the device has a relatively complex structure, requiring a separate suction mechanism, resulting in a complex structure and high cost. Utility Model Content

[0005] This utility model addresses the shortcomings of existing technologies by providing a nonwoven fabric spinning and spreading device. The nonwoven fabric spinning and spreading device can realize airflow self-circulation, sort out the turbulent airflow during the fiber bundle distribution process, achieve controllable backflow, greatly improve the spinning spread rate, and effectively improve the web laying efficiency and uniformity.

[0006] The technical solution of this utility model to solve the above-mentioned technical problems is as follows: a non-woven fabric spinning and spreading device, the non-woven fabric spinning and spreading device comprising:

[0007] Pressure-reducing nozzle;

[0008] A swivel assembly facing the outlet of the pressure-reducing nozzle;

[0009] The multi-component housing includes a spinning box, a channel cavity, and an airflow combing zone arranged vertically from top to bottom. The pressure-reducing nozzle and the yarn-aligning assembly are located inside the spinning box. The upper and lower parts of the channel cavity are respectively connected to the spinning box and the airflow combing zone. The airflow combing zone is connected to the spinning box through a connecting pipe.

[0010] Furthermore, the airflow combing zone is an area enclosed by at least two airflow combing plates, which are fixedly installed on the outside of the passageway cavity.

[0011] Furthermore, the airflow combing plate is fixedly installed on the lower half of the outer side of the channel cavity, an airflow gap is provided between the airflow combing plate and the channel cavity, an air vent is provided at the upper end of the airflow combing plate, and the connecting pipe connects the air vent and the lower part of the spinning box.

[0012] Furthermore, the width of the airflow gap between each airflow combing plate and the channel cavity is 1-6cm, and the width of the upper surface of the airflow combing plate is greater than the width of the airflow gap.

[0013] Furthermore, the oscillating wire assembly is provided with a connecting base, an oscillating surface, and a dispersing surface. The oscillating wire assembly is connected to a drive motor through the connecting base. The drive motor drives the oscillating wire assembly to oscillate in the horizontal direction. The oscillating surface and the dispersing surface face the pressure reducing nozzle.

[0014] Furthermore, the dispersion surface is semi-conical, and the oscillating surfaces are symmetrically arranged on both sides of the dispersion surface, and the oscillating surfaces are flat inclined surfaces.

[0015] Furthermore, the oscillating surfaces on both sides of the dispersion surface are symmetrically inclined toward the dispersion surface, the inclination angle of the two oscillating surfaces relative to the horizontal plane is 65-75°, and the inclination angle of the oscillating surfaces relative to the semi-conical cross-section of the dispersion surface is 160-180°.

[0016] Furthermore, the pressure-reducing nozzle includes a spinneret channel, in which a pressure-reducing chamber inlet, a pressure-reducing chamber, and a pressure-reducing chamber outlet are arranged in a transversely connected manner, with the pressure-reducing chamber outlet facing the oscillating spinneret assembly.

[0017] Furthermore, the diameter of the inlet of the pressure-reducing chamber is 0.8±0.5mm, the diameter of the outlet of the pressure-reducing chamber is 0.6±0.5mm, the volume of the pressure-reducing chamber is 5±2mL, and the outlet diameter of the pressure-reducing nozzle is 6±5mm.

[0018] Furthermore, the length-to-diameter ratio of the inlet of the pressure-reducing chamber is (3-15) / 1, and the length-to-diameter ratio of the outlet of the pressure-reducing chamber is (3-15) / 1.

[0019] Furthermore, the decompression chamber is equipped with a combing and separation component, which includes a combing column and a dispersing disk. The dispersing disk is fixedly connected to the interior of the decompression chamber and has several dispersing holes.

[0020] The beneficial effects of this utility model are:

[0021] The nonwoven fabric spinning and spreading equipment uses a multi-component box to create negative pressure in the spinning box area by utilizing the Venturi effect generated by high spinning speed, thereby achieving airflow self-circulation. This sorts out the turbulent airflow during the fiber distribution process, achieves controllable backflow, significantly improves the spinning spread rate, and effectively improves the web laying efficiency and uniformity.

[0022] The airflow in the airflow combing plate enters the spinning box through the connecting pipe, thereby reducing the airflow from following the fiber downwards. When the fiber is webbed, there is no high-speed airflow, the fiber webbed speed is reduced, the fiber is more easily webbed evenly, and the web uniformity is improved.

[0023] By controlling the aspect ratio of the inlet and outlet of the pressure-reducing nozzle and setting up a combing and separation component, the expansion ratio of the fiber bundle ejected from the nozzle can be effectively increased. At the same time, the linear density of the ejected fiber bundle can be controlled to improve the uniformity of the single-layer web of ultrafine fibers. Using the linear density provided by this invention, the uniformity of each layer of the fiber web can be effectively improved without reducing production efficiency. Through low linear density multi-layer web formation, the uniformity of the entire nonwoven fabric can be improved. Attached Figure Description

[0024] Figure 1 A schematic diagram of the internal structure of a pressure-reducing spinneret;

[0025] Figure 2 A schematic diagram of the three-dimensional structure of a spinning and spreading equipment;

[0026] Figure 3 A schematic diagram of the internal structure of a spinning and spreading equipment;

[0027] Figure 4This is a three-dimensional structural diagram of the oscillating wire assembly;

[0028] Figure 5 This is a three-dimensional structural diagram of the airflow combing plate;

[0029] Figure 6 This is a three-dimensional structural diagram of the airflow combing plate from another angle.

[0030] Figure 7 This is the left view of the oscillating wire assembly;

[0031] Figure 8 This is a bottom view of the oscillating wire assembly;

[0032] Figure 9 A schematic diagram of the structure of the separated components; Figure 10 This is a schematic diagram of the oscillating fiber assembly and fiber motion trajectory in Example 1;

[0033] In the diagram, 1. Pressure reducing chamber inlet; 2. Pressure reducing chamber; 3. Pressure reducing chamber outlet; 4. Spinneret channel; 5. Pressure reducing nozzle; 6. Spinning assembly; 7. Spinning box; 8. Channel cavity; 9. Airflow combing zone; 10. Connecting pipe; 11. Combing and separating assembly;

[0034] 61. Connecting base; 62. Swinging surface; 63. Dispersion surface;

[0035] 91. Airflow combing plate; 92. Ventilation holes;

[0036] 111. Combing column; 112. Dispersion disc; 113. Dispersion hole. Detailed Implementation

[0037] The specific embodiments of this utility model are described in detail below. This utility model can be implemented in many ways different from those described herein, and those skilled in the art can make similar improvements without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed herein.

[0038] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used is for describing particular embodiments only and is not intended to limit the scope of this invention.

[0039] like Figures 1-6 As shown, a nonwoven fabric spinning and spreading device includes:

[0040] Pressure-reducing nozzle 5;

[0041] The oscillating wire assembly 6 faces the outlet of the pressure-reducing nozzle 5;

[0042] The multi-component housing includes a spinning box 7, a channel cavity 8, and an airflow combing zone 9 arranged vertically from top to bottom. The pressure-reducing nozzle 5 and the yarn-aligning assembly 6 are located inside the spinning box 7. The channel cavity 8 is connected to the spinning box 7 and the airflow combing zone 9 at the top and bottom, respectively. That is, the channel cavity 8 is connected to the lower part of the spinning box 7, and the airflow combing zone 9 is located below the channel cavity 8. The airflow combing zone 9 is connected to the spinning box 7 through a connecting pipe 10. The channel cavity 8 and the airflow combing zone 9 are connected sequentially in a coaxial vertical direction. The airflow combing zone 9 is connected to the spinning box 7 through the connecting pipe 10.

[0043] The airflow in the airflow combing plate 91 enters the spinning box 7 through the connecting pipe 10, thereby reducing the airflow from following the fiber downwards. When the fiber is webbed, there is no high-speed airflow accompanying it, the fiber webbed speed is reduced, the fiber is more easily webbed evenly, and the web uniformity is improved.

[0044] In some embodiments, the airflow combing zone 9 is an area enclosed by at least two airflow combing plates 91, which are fixedly installed on the outside of the passageway cavity 8.

[0045] In some embodiments, the length of the channel cavity 8 is greater than the length of the spinning box 7 in the fiber oscillation direction. This structural arrangement facilitates the full oscillation and dispersion of the fibers. Alternatively, the length of the channel cavity 8 is the same as the length of the airflow combing zone 9 in the fiber oscillation direction. This structural arrangement further facilitates the stable landing of the oscillating fibers, resulting in a uniform nonwoven fabric.

[0046] In some embodiments, the airflow combing plate 91 is fixedly installed on the outer side of the lower half of the channel cavity 8, an airflow gap is provided between the airflow combing plate 91 and the channel cavity 8, an air vent 92 is provided at the upper end of the airflow combing plate 91, and the connecting pipe 10 connects the air vent 92 and the lower part of the spinning box 7.

[0047] In some embodiments, such as Figures 5-6 As shown, the upper end of the airflow combing plate 91 is provided with a number of ventilation holes 92. Each ventilation hole 92 is connected to the spinning box 7 through a connecting pipe 10. The arrangement of the number of combing ventilation holes 92 is more conducive to the smooth return of the airflow in the airflow combing zone 9 to the spinning box 7, further avoiding the downward movement of the fiber with the high-speed airflow, effectively improving the uniformity of the web formation, and also more conducive to the processing of ultrafine fibers. Figure 2 The diagram provided is only a schematic of a connecting tube 10 for the purpose of illustration, but it does not constitute a limitation on the technical solution of this application.

[0048] In some embodiments, the connecting pipe 10 is a flexible air pipe, which is convenient for installation and use, but this is not a limitation of the present invention. As long as the connecting pipe 10 can realize the connection between the airflow combing zone 9 and the spinning box 7, it is within the protection scope of the present invention.

[0049] In some embodiments, the width of the airflow gap between each airflow combing plate 91 and the channel cavity 8 is 1-6 cm, and the width of the upper end face of the airflow combing plate 91 is greater than the width of the airflow gap, which is more conducive to setting vent holes 92 on the airflow combing plate 91, such as... Figure 5 , Figure 6 As shown.

[0050] In actual production applications, the number of ventilation holes 92, the width of the gap, and the height of the upper surface of the airflow carding plate 91 can be selected according to the fiber conditions, because these characteristics will affect the airflow speed in the airflow carding zone 9. For finer fibers, the airflow speed in the airflow carding zone 9 needs to be relatively slower to avoid fiber breakage.

[0051] In some embodiments, the channel cavity 8 and the spinning box 7 are fixedly installed by hinges, and the airflow carding plate 91 is fixedly installed by hinges to the channel cavity 8. Using hinges for connection makes installation more convenient and facilitates the replacement of relevant components according to production needs. However, this does not constitute a limitation on the technology of this application; any fixed installation between the channel cavity 8 and the spinning box 7, and between the airflow carding plate 91 and the channel cavity 8, falls within the scope of protection of this application.

[0052] In some embodiments, such as Figure 4 As shown, the oscillating yarn assembly 6 is provided with a connecting base 61, an oscillating surface 62, and a dispersing surface 63. The oscillating yarn assembly 6 is connected to a drive motor through the connecting base 61. The drive motor drives the oscillating yarn assembly 6 to oscillate in the horizontal direction. The oscillating surface 62 and the dispersing surface 63 face the pressure reducing nozzle 5. The drive motor only needs to be able to realize the oscillation of the oscillating yarn assembly 6; its structure is not shown in detail in the figure. The oscillating yarn assembly 6 and the drive motor can be installed using conventional methods, which are not shown in detail in the figure. Furthermore, the pressure reducing nozzle 5 is fixedly installed inside the spinning box 7 using conventional fixing methods. Figure 3 The details will not be shown here again.

[0053] In some embodiments, the dispersion surface 63 is semi-conical, and the oscillating surface 62 is symmetrically provided on both sides of the dispersion surface 63. The oscillating surface 62 is a straight inclined surface.

[0054] In some embodiments, such as Figure 4 , Figure 7 , Figure 8As shown, the oscillating surfaces 62 on both sides of the dispersion surface 63 are symmetrically inclined toward the dispersion surface 63. The inclination angle α of the two oscillating surfaces 62 relative to the horizontal plane is 65-75°, and the inclination angle b of the oscillating surfaces 62 relative to the semi-conical cross section of the dispersion surface 63 is 160-180°.

[0055] In some embodiments, such as Figure 1 As shown, the pressure-reducing nozzle 5 includes a spinneret channel 4, and the spinneret channel 4 is provided with a pressure-reducing chamber 2 inlet 1, a pressure-reducing chamber 2 and a pressure-reducing chamber 2 outlet connected in a transverse sequence. The pressure-reducing chamber 2 outlet faces the swaying assembly 6.

[0056] In some embodiments, the diameter of the inlet 1 of the pressure-reducing chamber 2 is 0.8±0.5mm, the diameter of the outlet of the pressure-reducing chamber 2 is 0.6±0.5mm, the volume of the pressure-reducing chamber 2 is 5±2mL, and the outlet diameter of the pressure-reducing nozzle 5 is 6±5mm.

[0057] In some embodiments, the length-to-diameter ratio of the inlet 1 of the pressure-reducing chamber 2 is (3-15) / 1, and the length-to-diameter ratio of the outlet of the pressure-reducing chamber 2 is (3-15) / 1.

[0058] like Figure 1 and Figure 9 As shown, the decompression chamber is equipped with a carding and separation component 11. The carding and separation component 11 includes a carding column 111 and a dispersing disk 112. The dispersing disk 112 is fixedly connected to the inside of the decompression chamber 2. The dispersing disk 112 is provided with a plurality of dispersing holes 113. The spinning solution is sprayed out from the outlet 3 of the decompression chamber through the dispersing holes 113.

[0059] More specifically, the dispersing discs 112 are fixedly mounted on both sides of the combing column 111. The outer diameter of the dispersing discs 112 is the same as the inner diameter of the pressure-reducing chamber 2, so that the dispersing discs 112 can be directly fixed on the inner cross-section of the pressure-reducing chamber 2. The disc surface of the dispersing discs 112 is perpendicular to the flow direction of the spinning solution in the pressure-reducing nozzle 5. The dispersing discs 112 can be integrally formed with the inner wall of the pressure-reducing chamber 2, or they can be fixed by welding, screws, or other methods.

[0060] More specifically, the two ends of the combing column 111 are fixedly disposed in the middle of the dispersing disk 112. The combing column 111 and the dispersing disk 112 can be integrally machined, or connected by welding or threading, as long as the combing column 111 and the dispersing disk 112 are fixedly connected.

[0061] More specifically, the combing column 111 is a smooth cylindrical, teardrop-shaped, gourd-shaped, shuttle-shaped, or frustum-shaped column. The figure shows a shuttle-shaped column, but this is not a limitation on the scope of protection of this utility model.

[0062] More specifically, the overall length of the combing and separating component 11 (i.e., the distance between the two dispersing discs 112) is 40%-100% of the total length of the decompression chamber 2; the cross-sectional area of ​​the combing column 111 perpendicular to the direction of the spinning solution flow accounts for 10%-50% of the cross-sectional area of ​​the decompression chamber 2.

[0063] Preferably, the combing and separating component 11 is installed on the side of the decompression chamber 2 near the decompression chamber inlet 1.

[0064] When the spinning solution enters the depressurization chamber 2, the space in the depressurization chamber 2 increases, the pressure decreases, and microphase separation occurs in the spinning solution. This invention incorporates a carding separation component 11 into the depressurization chamber 1, allowing the spinning solution to undergo slow microphase separation, which helps stabilize the rich solution phase, thereby improving fiber strength and crystallinity. Simultaneously, the spinning solution flows along the shape of the carding column 111, causing the spinning solution fluid to orient itself, which can improve the regularity of the molecular chains and increase crystallinity. After being carded by the carding separation component 11, the spinning solution, once formed into fibers, can increase the fiber bundle opening width.

[0065] More specifically, each of the dispersion discs 112 is uniformly provided with four fan-shaped dispersion holes 113, and the dispersion holes 113 on the two dispersion discs 112 are staggered, which is more conducive to the combing and straightening of the dispersion liquid and further improves the fiber opening ability. In actual production, the shape and number of dispersion holes 113 can also be reasonably set according to the properties of the spinning solution and the requirements of the processed products. After the polyethylene fiber is horizontally sprayed from the pressure reducing nozzle 5, it hits the sizing assembly 6. After being reflected by the surface of the sizing assembly 6, the polyethylene fiber falls into the multi-component coordinating box. After being stretched in the multi-component coordinating box, it is uniformly formed into a web. That is, after the spinning solution is filamentized by the pressure reducing nozzle 5, it passes through the negative pressure suction zone of the spinning box 7, the channel cavity 8 and the airflow combing zone 9 in sequence and is spread on the web forming equipment to form a web; finally, the fiber web is extruded to obtain a polymer sheet.

[0066] The multi-component combination utilizes the Venturi effect generated by high spinning speed within the spinning box 7 to create negative pressure, thereby achieving airflow self-circulation between the spinning box 7 and the airflow combing zone 9. This combs the turbulent airflow during the fiber distribution process, improving the spread width of the spinned fibers and the uniformity of the web width.

[0067] The oscillation frequency of the yarn-spinning assembly 6 is 3-30 times per second, and the oscillation amplitude of the yarn-spinning assembly 6 is ±50mm (with the center position of the oscillation amplitude when the central axis of the dispersing surface 63 is directly opposite the pressure-reducing nozzle 5). Under this oscillation frequency condition, it is more conducive to coordinating with the spinning speed, significantly increasing the spread width of the spun fibers, and effectively improving the uniformity of the web width. The yarn-spinning assembly 6 and the fiber movement trajectory are as follows... Figure 10 As shown.

[0068] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are exhaustively listed. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0069] For those skilled in the art, various modifications and improvements can be made without departing from the concept of this utility model, and these modifications and improvements are all within the protection scope of this utility model. The protection scope of this utility model is defined by the appended claims.

Claims

1. A nonwoven fabric spinning and spreading device, characterized in that, The nonwoven fabric spinning and spreading equipment includes: Pressure-reducing nozzle; A swivel assembly facing the outlet of the pressure-reducing nozzle; The multi-component housing includes a spinning box, a channel cavity, and an airflow combing zone arranged vertically from top to bottom. The pressure-reducing nozzle and the yarn-aligning assembly are located inside the spinning box. The upper and lower parts of the channel cavity are respectively connected to the spinning box and the airflow combing zone. The airflow combing zone is connected to the spinning box through a connecting pipe.

2. The spunlaid nonwoven fabric apparatus of claim 1, wherein, The airflow combing zone is an area enclosed by at least two airflow combing plates, which are fixedly installed on the outside of the passageway cavity.

3. The apparatus according to claim 2, wherein The airflow combing plate is fixedly installed on the lower half of the outer side of the channel cavity. An airflow gap is provided between the airflow combing plate and the channel cavity. A vent is provided at the upper end of the airflow combing plate. The connecting pipe connects the vent and the lower part of the spinning box.

4. The apparatus according to claim 3, wherein The width of the airflow gap between each airflow combing plate and the passageway cavity is 1-6cm, and the width of the upper surface of the airflow combing plate is greater than the width of the airflow gap.

5. The apparatus according to claim 1, wherein The oscillating wire assembly is provided with a connecting base, an oscillating surface and a dispersing surface. The oscillating wire assembly is connected to a drive motor through the connecting base. The drive motor drives the oscillating wire assembly to oscillate in the horizontal direction. The oscillating surface and the dispersing surface face the pressure reducing nozzle.

6. The apparatus according to claim 5, wherein The dispersion surface is semi-conical, and the oscillating surface is symmetrically arranged on both sides of the dispersion surface. The oscillating surface is a straight inclined plane.

7. The apparatus according to claim 6, wherein The two oscillating surfaces on both sides of the dispersion surface are symmetrically inclined toward the dispersion surface, the inclination angle of the two oscillating surfaces relative to the horizontal plane is 65-75°, and the inclination angle of the oscillating surfaces relative to the semi-conical cross section of the dispersion surface is 160-180°.

8. The apparatus according to claim 1, wherein The pressure-reducing nozzle includes a spinneret channel, in which a pressure-reducing chamber inlet, a pressure-reducing chamber, and a pressure-reducing chamber outlet are arranged in a transverse sequence, with the pressure-reducing chamber outlet facing the oscillating spinneret assembly.

9. The apparatus according to claim 8, wherein The diameter of the inlet of the pressure-reducing chamber is 0.8±0.5mm, the diameter of the outlet of the pressure-reducing chamber is 0.6±0.5mm, the volume of the pressure-reducing chamber is 5±2mL, and the outlet diameter of the pressure-reducing nozzle is 6±5mm. The length-to-diameter ratio of the inlet of the pressure-reducing chamber is (3-15) / 1, and the length-to-diameter ratio of the outlet of the pressure-reducing chamber is (3-15) / 1.

10. The apparatus according to claim 9, wherein The pressure relief chamber is equipped with a combing and separation component, which includes a combing column and a dispersing disk. The dispersing disk is fixedly connected to the inside of the pressure relief chamber and has a plurality of dispersing holes.

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