Cartridge type net, vent pipe, tank, and method for attaching and detaching net

Abstract

To provide a cartridge type net, a vent pipe, a tank and a method for attaching and detaching the net capable of facilitating the attachment and detachment of the net attached to the pipe.SOLUTION: A cartridge (23) is disposed between a first plate (21) provided on a pipe (12) and a second plate (22) attached to the first plate (21), the cartridge (23) is attached to and detached from the pipe (12) through an opening (24) provided between the first plate (21) and the second plate (22), and the cartridge (23) includes a cartridge body (31) and a net (32) attached to the cartridge body (31) and located on a pipe axis (L) of the pipe (12) when attached to the pipe (12).SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a cartridge-type screen, a ventilation pipe, a tank, and a method for attaching and detaching the screen. [Background technology]

[0002] The Fire Service Act requires the installation of vent pipes in hazardous materials storage facilities, such as hazardous material tanks, to vent the tank. It also requires the installation of fire prevention wire mesh in the vent pipes. Furthermore, the fire prevention wire mesh must be regularly cleaned to prevent clogging due to dust and other particles. However, when it comes to maintaining and cleaning fire prevention wire mesh in hazardous material tanks, for example, the mesh is typically located at heights of 5 meters or more, and inspection, cleaning, and replacement at this height constitutes work at height. Inspection, cleaning, and replacement at height poses a significant psychological burden for the inspector, as well as the risk of the inspector falling, including the flanges, bolts, and nuts of the vent pipes, or the wire mesh itself. Furthermore, the work itself, which is performed at a high altitude, makes cleaning and replacing fire prevention wire mesh challenging. As a countermeasure, for example, in Patent Document 1, a fire prevention wire mesh is placed between the first and second flanges at the end of the ventilation pipe, and a rotating brush is installed, but this does not completely remove dust from the clogged mesh. Also, in Patent Document 2, multiple wire meshes are vertically arranged in a wire mesh storage chamber installed in the pipe, which extends the interval between cleaning and replacement of the wire mesh, but the cleaning and replacement work itself remains the same. Furthermore, in Patent Document 3, a backfire prevention wire mesh is installed near the end of the discharge pipe where the cap is located, but this raises issues such as the possibility that the cap may not be removed if the internal pressure inside the tank increases, and if the cap is made of plastic to make it easier to remove, plastic deterioration may occur. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Utility Model Application Publication No. 63-062398 [Patent Document 2] Japanese Utility Model Application Publication No. 61-59597 [Patent Document 3] Japanese Utility Model Application Publication No. 01-092600 Summary of the Invention [Problem to be solved by the invention]

[0004] Given this background, there has been a demand for an item or method that allows easy cleaning and replacement of, for example, fire prevention wire mesh on ventilation pipes.

[0005] The present invention has been made in view of the above-mentioned circumstances, and has as its object to make it easier to attach and detach a net attached to a pipe. [Means for solving the problem]

[0006] In order to solve the above problems, the present invention proposes the following means. A cartridge-type net according to one embodiment of the present invention is a cartridge placed between a first plate provided on a tube and a second plate attached to the first plate, the cartridge being attached to and detached from the tube through an opening provided between the first plate and the second plate, and the cartridge comprising a cartridge body and a net attached to the cartridge body and positioned on the tube axis when attached to the tube. [Effects of the Invention]

[0007] According to the present invention, the net attached to the tube can be easily attached and detached. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 2 is a side view showing a tank according to an embodiment of the present invention. [Figure 2] FIG. 2 is a perspective view showing a main part of the tank shown in FIG. [Figure 3] FIG. 3 is a diagram showing a state in which the cartridge is being removed from the view shown in FIG. 2. [Figure 4]FIG. 4 is a view taken along the line IV-IV in FIG. 2. [Figure 5] FIG. 3 is a view taken along arrows VV shown in FIG. 2. [Figure 6] FIG. 5 is a diagram showing the state in which the cartridge is being mounted in the diagram shown in FIG. 4. [Figure 7] FIG. 6 is a diagram showing the state in which the cartridge is being mounted in the diagram shown in FIG. 5. [Figure 8] FIG. 5 is a plan view of a plate included in the cartridge shown in FIG. 4. [Figure 9] 5 is a plan view of a mesh included in the cartridge shown in FIG. 4. [Figure 10] FIG. 10 is a plan view of a gasket included in a cartridge-type net according to a modified example of the present invention. [Figure 11] 10 is a first example of a ventilation pipe including a cartridge-type net according to a modified example of the present invention. [Figure 12] FIG. 13 is a view taken along the arrow XII in FIG. [Figure 13] 10 is a second example of a ventilation pipe including a cartridge-type net according to a modified example of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, a cartridge-type net, a vent pipe equipped with the cartridge-type net, a tank equipped with the vent pipe, and a method for attaching and detaching the net according to one embodiment of the present invention will be described with reference to the drawings. In this embodiment, the explanation will be given using an example of a tank equipped with a vent pipe.

[0010] As shown in FIG. 1, the tank 10 includes a tank body 11 and a vent pipe 12 provided in the tank body 11. The tank body 11 of this embodiment may store a liquid that has the potential to cause or spread a fire, or a liquid that is difficult to extinguish, etc. The vent pipe 12 protrudes from the tank 10 and provides ventilation between the inside and outside of the tank 10.

[0011] 2 and 3, a cartridge-type net 20 is provided on the ventilation pipe 12. The cartridge-type net 20 includes a first plate 21 provided on the ventilation pipe 12, a second plate 22 attached to the first plate 21, and a cartridge 23 detachably disposed therebetween. Here, "on the pipe" refers to, for example, an intermediate position or an end position in the ventilation path of the ventilation pipe 12.

[0012] The vent pipe 12 of this embodiment comprises a vent pipe main body 13 that protrudes upward from the upper wall 11a of the tank main body 11, and a first plate 21 and a second plate 22 that are joined to the vent pipe main body 13 to construct the cartridge-type mesh 20. The vent pipe body 13 is a pipe bent in a J-shape, and is joined to the upper wall 11a of the tank body 11 and protrudes upward. The vent pipe body 13 is continuous with the upper space inside the tank 10 so as to be able to ventilate.

[0013] The first plate 21 and the second plate 22 are both flanges. The first plate 21 is formed in a plate shape having an annular shape. The first plate 21 is integrally joined to the vent pipe main body 13. The second plate 22 is formed in a plate shape having an annular shape like the first plate 21, and has the same inner and outer diameters as the first plate 21. The first plate 21 and the second plate 22 are fastened together at a plurality of points in the circumferential direction by fastening bolts and fastening nuts.

[0014] When installing the cartridge-type mesh 20 in an existing ventilation pipe 12, it is possible to use the pre-installed first plate 21 and second plate 22. In this case, the cartridge-type mesh 20 may be installed by removing some of the fastening bolts and fastening nuts that were installed in advance at equal intervals around the circumference to fasten the first plate 21 and the second plate 22 together.

[0015] As shown in FIGS. 3 to 5, the cartridge type net 20 has a configuration in which a cartridge 23 is attached to the ventilation pipe 12 through an opening 24 between a first plate 21 and a second plate 22. The opening 24 in this embodiment is provided in a part of the circumferential direction between the first plate 21 and the second plate 22. The opening 24 is formed by sandwiching a packing 26 between the first plate 21 and the second plate 22. 10, the packing 26 has an opening 26a in a part of the circumferential direction in a plan view and is formed in a C-shape. The opening 26a of the packing 26 sandwiched between the first plate 21 and the second plate 22 becomes the opening 24 that is open in a part of the circumferential direction.

[0016] 4 and 5, the cartridge 23 includes a cartridge body 31 and a mesh 32 attached to the cartridge body 31. The cartridge 23 is attached to and detached from the ventilation pipe 12 through the opening 24, as shown in FIGS.

[0017] The cartridge body 31 includes a pair of plates 33 that sandwich the net 32, and a wing bolt 34a (bolt) and a wing nut 34b (nut) that sandwich and fix the pair of plates 33 from the outside. The thickness of the cartridge body 31 is set to be equal to the axial width of the opening 24 provided between the first plate 21 and the second plate 22 when the mesh 32 is sandwiched and fixed between a pair of plates 33.

[0018] The pair of plates 33 are formed in the same shape, and have irregular plate shapes with a semicircular diameter at one end and extending to a constant width at the other end. 8, each plate 33 is provided with a through opening 33a for exposing the mesh 32. The mesh 32 sandwiched between the pair of plates 33 is exposed to the outside of the cartridge body 31 through the through opening 33a.

[0019] The through opening 33 a is provided at a position that corresponds to the inside of the vent pipe body 13 when the cartridge 23 is attached to the vent pipe 12 . Although not particularly limited, the through opening 33a may be formed in a shape similar to the inner shape of the vent pipe main body 13.

[0020] A support frame 33b is provided around the through opening 33a. The outer shape of the support frame 33b is larger than the through holes 21a and 22a of the first plate 21 and the second plate 22. When the cartridge 23 is attached to the ventilation pipe 12, it is preferable that the support frame 33b is supported between the first plate 21 and the second plate 22 around the entire periphery.

[0021] 4 and 5, the cartridge body 31 has a protrusion 35 on the other end that is disposed outside the vent pipe 12 when the cartridge 23 is attached to the vent pipe 12. The protrusion 35 is provided integrally and continuously with the support frame 33b. The width of the protrusion 35 is set to be equal to the width in a direction perpendicular to the axis of the opening 24 provided between the first plate 21 and the second plate 22. A handle 36 consisting of a rectangular through-hole is provided on the protruding portion 35. The handle 36 is a portion on which an operator can hold the fingers when gripping the protruding portion 35.

[0022] 9, the mesh 32 of the cartridge 23 has a shape similar to that of the pair of plates 33, with one end being semicircular and the other end being irregularly shaped with a constant width. The mesh 32 is formed to be at least larger than the through opening 33a of the cartridge body 31. The periphery of the mesh 32 arranged in the through opening 33a is formed so as to be able to be supported by the support frame 33b of the pair of plates 33. Since the cartridge-type net 20 of this embodiment is used as a fire prevention net, a metal net of 40 mesh or more may be used as the net 32. The net 32 ​​may be provided with holes into which butterfly bolts 34a are inserted.

[0023] The cartridge-type net 20 as described above can be attached to and detached from the ventilation pipe 12, as shown in Figures 6 and 7. That is, the cartridge 23 can be attached to the ventilation pipe 12 through an opening 24 provided in the ventilation pipe 12, thereby attaching the net 32 ​​to the ventilation pipe 12. When the cartridge 23 is attached, the mesh 32 exposed to the through-opening 33a allows ventilation between the inside and outside of the tank 10 through the ventilation pipe 12. This allows the cartridge 23 to be used as a fire prevention mesh.

[0024] After a long period of use or when the mesh 32 is damaged, an operator can perform maintenance by removing the cartridge 23 from the ventilation pipe 12. The operator can grasp the protrusion 35 and remove the cartridge 23 from the opening 24. Then, the orientation of both sides of the cartridge 23 can be reversed, the mesh 32 can be cleaned, or the mesh 32 can be replaced. When replacing the mesh 32, the wing bolts 34a and wing nuts 34b are removed and the mesh 32 is removed. A new mesh 32 is sandwiched between the pair of plates 33 and fixed again with the wing bolts 34a and wing nuts 34b.

[0025] Thereafter, the cartridge 23 is inserted through the opening 24 of the vent pipe 12, and the cartridge 23 is attached to the vent pipe 12, thereby attaching the net 32 ​​to the vent pipe 12. This allows the vent pipe 12 to be used again, for example, as a fire prevention net.

[0026] According to the method of attaching and detaching a net of this embodiment, which attaches and detaches the cartridge 23 in this manner, the net 32 ​​can be placed in and removed from the vent pipe 12 by attaching and detaching the cartridge 23 to and from the opening 24 provided in advance in the vent pipe 12. Therefore, an operator can easily attach and detach the net 32 ​​to and from the predetermined position in the vent pipe 12.

[0027] According to the cartridge type net 20 described above, the following actions and effects can be obtained. That is, according to the cartridge-type mesh 20 of this embodiment, an opening 24 is provided between the first plate 21 and the second plate 22 on the ventilation pipe 12. A cartridge 23 equipped with a mesh 32 can be attached to and detached from the ventilation pipe 12 through this opening 24. Therefore, when the cartridge 23 is attached to the vent pipe 12 through the opening 24, the mesh 32 is positioned on the pipe axis L. As a result, by attaching or detaching the cartridge 23 through the opening 24, the mesh 32 can be easily positioned on the pipe axis L of the vent pipe 12. Therefore, an operator can easily attach or detach the mesh 32 attached to the vent pipe 12.

[0028] In the cartridge-type net 20 of this embodiment, the C-shaped packing 26 is sandwiched between the first plate 21 and the second plate 22, and the opening 24 can be provided by the opening 26a of the packing 26. Therefore, it is easy to provide the opening 24 in the ventilation pipe 12.

[0029] In the cartridge-type net 20 of this embodiment, the first plate 21 and the second plate 22 are annular, and the cartridge body 31 surrounds the net 32 ​​and has a support frame 33b supported between the first plate 21 and the second plate 22. Therefore, the periphery of the mesh 32 exposed from the opening 24 of the cartridge body 31 is stably supported by the vent pipe 12. A gap is unlikely to occur between the vent pipe 12 and the mesh 32 of the cartridge 23 at the opening 24. This allows the mesh 32 to be stably installed on the vent pipe 12 with a simple configuration.

[0030] In the cartridge-type net 20 of this embodiment, the cartridge body 31 includes a pair of plates 33 that sandwich the net 32, and the net 32 ​​is exposed to the outside of the cartridge 23 through through-openings 33a provided in the pair of plates 33. This allows the net 32 ​​to be stably supported by the cartridge body 31. This allows the net to be more stably installed in the ventilation pipe 12. It also makes it easier to ensure the strength of the cartridge 23 that supports the net 32.

[0031] In the cartridge-type net 20 of this embodiment, the cartridge body 31 is provided with a wing bolt 34a and a wing nut 34b that sandwich the net 32 ​​and a pair of plates 33. Therefore, by sandwiching the net 32 ​​between the pair of plates 33 and tightening the wing bolt 34a and the wing nut 34b, the cartridge body 31 can stably support the net 32. In addition, by removing the wing bolt 34a and the wing nut 34b, an operator can easily replace the net 32.

[0032] In the cartridge-type net 20 of this embodiment, a protrusion 35 is provided on a part of the cartridge body 31, and a handle 36 is provided on the protrusion 35. Therefore, an operator can grasp the protruding portion 35 to insert or remove the cartridge 23 that is attached to the ventilation pipe 12 through the opening 24. Furthermore, when an operator grasps the protruding portion 35 to attach or detach the cartridge 23, the operator can grasp the protruding portion 35 by the handle 36. This makes it easy to attach and detach the cartridge 23, improving usability.

[0033] Furthermore, in the vent pipe 12 equipped with the cartridge-type mesh 20 as described above, or in the tank 10 equipped with this vent pipe 12, workers can easily attach and detach the mesh 32 attached to the vent pipe 12. This makes it easy to perform maintenance on the vent pipe 12 or the tank 10 equipped with the vent pipe 12, and makes it easy to prevent clogging of the mesh 32 and maintain its function as a fire prevention mesh for a long period of time.

[0034] The technical scope of the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention. In the above embodiment, the cartridge 23 is attached to the vent pipe 12 of the tank 10, and the net 32 ​​is installed as a fire prevention net. However, since the cartridge-type net 20 is effective not only for fire prevention but also for preventing, for example, the inclusion of garbage, there are no limitations on the use or object to which it can be attached. For example, the cartridge type net 20 may be attached not to the ventilation pipe 12 but to various air outlets such as a ventilation louver, a ventilation hood, or a smoke exhaust device in a restaurant (for example, a yakiniku restaurant). The cartridge-type net 20 may also be attached to a simple boundary wall between the tank 10 and a space such as a room.

[0035] There is no particular problem with the first plate 21 and the second plate 22 as long as there is space between the two objects into which the cartridge-type net 20 can be inserted. The first plate 21 and the second plate 22 may be joined together, or the first plate 21 and the second plate 22 may be separated and joined together in some way. When the first plate 21 and the second plate 22 are joined together, they may be considered as a single item and may be an item that has space into which the cartridge-type net 20 can be inserted. 11 to 13, a frame 40 may be provided to cover a plate (e.g., a flange attached to the piping) provided on the vent pipe 12, thereby providing a space into which the cartridge-type mesh 20 (cartridge 23) can be inserted. In both the first example shown in FIGS. 11 and 12 and the second example shown in FIG. 13, a flange 13a is provided at the tip of the vent pipe body 13, and a frame 40 is attached. The frame 40 may be attached to the flange 13a so as to be slidable in the radial direction of the flange 13a, for example. A first plate 21 and a second plate 22 are provided on the underside of the frame 40. The first plate 21 and the second plate 22 are connected via a suspension member 41. As in the first example shown in FIG. 11, there may be multiple suspension members 41, or as in the second example shown in FIG. 13, there may be only one suspension member 41. 11 to 13, the frame 40 may have the first plate 21 and the second plate 22, or the frame 40 may be one of the first plate 21 and the second plate 22, and a plate provided on the ventilation pipe 12 (for example, a flange 13a attached to the piping) may be the other of the first plate 21 and the second plate 22. The first plate 21 and the second plate 22 may be joined in whole or in part. Both the first plate 21 and the second plate 22 may be circular or rectangular.

[0036] In the above embodiment, the cartridge-type mesh 20 is attached to the tip of the ventilation pipe 12, but the attachment position is not particularly limited. In the above embodiment, the first plate 21 is joined to the end of the ventilation pipe main body 13, and the second plate 22 is formed in an annular shape and joined to the first plate 21. For example, the second plate 22 may be at the end of another pipe, and the ventilation pipe 12 may be configured by joining the ventilation pipe main body 13 and another pipe with the first plate 21 and the second plate 22.

[0037] In the above embodiment, the openings 24 are provided in a portion of the circumferential space between the first plate 21 and the second plate 22, but the openings 24 may be provided over the entire circumferential space between the first plate 21 and the second plate 22. For example, if the first plate 21 is joined to the end of the vent pipe body 13 and the second plate 22 is joined to the end of another pipe, the entire gap between the first plate 21 and the second plate 22 may be an opening.

[0038] The cartridge type net 20 is only required to have a cartridge body 31 and a net 32, and the net 32 ​​may be joined directly to the cartridge body 31, or the net 32 ​​may be attached to a part of the cartridge body 31 in a state where the cartridge body 31 and the net 32 ​​are separated. When the mesh 32 is joined directly to the cartridge body 31, the mesh 32 may be joined to a hole or space in a part of the cartridge body 31 where the mesh 32 can be attached, or the entire cartridge body 31 may be the mesh 32. When the mesh 32 is attached to a part of the cartridge body 31 in a state where the cartridge body 31 and the mesh 32 are separated, the mesh 32 may be attached to a hole or space in a part of the cartridge body 31 where the mesh 32 can be attached, or preferably, from the viewpoint of stability, the cartridge body 31 is provided with a pair of plates 33 that sandwich the mesh 32, and more preferably, the cartridge body 31 is provided with a pair of plates 33 that sandwich the mesh 32, and the mesh 32 is held in place by fastening the pair of plates with bolts, nuts, etc.

[0039] In the above embodiment, the wing bolts 34a and the wing nuts 34b are used to sandwich and fix the net 32 ​​and the pair of plates 33, but other bolts and nuts may also be used for fixation. In addition, in the above embodiment, a protrusion 35 is provided on a part of the cartridge body 31, which is positioned outside the ventilation pipe 12 when the cartridge 23 is attached to the ventilation pipe 12, but the protrusion 35 does not have to be provided.

[0040] (Addendum) The embodiment can be understood, for example, as follows.

[0041] <1> A cartridge-type net according to one embodiment of the present invention is a cartridge placed between a first plate provided on a pipe and a second plate attached to the first plate, the cartridge being attached to and detached from the pipe through an opening provided between the first plate and the second plate, and the cartridge comprising a cartridge body and a net attached to the cartridge body and positioned on the pipe axis when attached to the pipe.

[0042] According to this cartridge-type net, an opening is provided between the first plate and the second plate on the pipe. A cartridge equipped with a net can be attached to and detached from the pipe through this opening. When the cartridge is attached to the pipe through the opening, the net is positioned on the pipe axis. Therefore, by attaching and detaching the cartridge through the opening, the net can be easily positioned on the pipe axis. Therefore, the net attached to the pipe can be easily attached and detached.

[0043] <2> the above <1> In the cartridge-type net according to the above aspect, at least one of the first plate and the second plate may be a flange.

[0044] <3> the above <1> or <2> The cartridge-type net according to the above aspect may further include a packing sandwiched between the first plate and the second plate, and the opening may be formed in the packing.

[0045] <4> the above <3> In the cartridge-type net according to the present invention, the gasket may be C-shaped in a plan view with an opening in a portion of the circumference, and the opening may be formed in a portion of the circumference by an opening in the gasket.

[0046] With this cartridge-type mesh, a C-shaped packing is sandwiched between the first and second plates, and openings in the packing can be formed in part of the circumference, making it easy to form openings in the pipe.

[0047] <5> the above <1> from <4> In the cartridge-type net according to any one of the above aspects, the first plate and the second plate may be formed in an annular shape.

[0048] <6> the above <1> from <5> In the cartridge-type net according to any one of the above aspects, the cartridge body may include a pair of plates sandwiching the net, and the net may be exposed to the outside of the cartridge through through openings provided in the pair of plates.

[0049] According to this cartridge-type net, the net is exposed to the outside through the through opening while the pair of plates are fixed to sandwich the net, so that the cartridge body can stably support the net.

[0050] <7> the above <6> In the cartridge-type net according to the above aspect, the cartridge body may include bolts and nuts that sandwich the net and the pair of plates.

[0051] With this cartridge-type net, the cartridge body can stably support the net, and workers can easily replace the net by removing the bolts and nuts.

[0052] <8> the above <1> from <7> In any one of the cartridge-type nets according to the above aspect, a part of the cartridge body may be provided with a protrusion that is positioned outside the tube when the cartridge is attached to the tube, and the protrusion may be provided with a handle.

[0053] This cartridge-type net allows the operator to grip the protruding portion to attach or detach the cartridge. At that time, the operator can grip the handle. Therefore, the cartridge can be easily attached or detached to or from the tube through the opening, making it easy to use.

[0054] <9> The ventilation pipe according to one aspect of the present invention comprises the pipe having the first plate and the second plate, and the <1> from <8> and a cartridge-type net according to any one of the above aspects.

[0055] According to this ventilation pipe, since the above-mentioned cartridge type mesh is provided, the mesh of the ventilation pipe can be easily attached and detached.

[0056] <10> The tank according to one aspect of the present invention is <9> and a tank body provided with the vent pipe.

[0057] According to this tank, since the tank is provided with the above-mentioned vent pipe, the mesh of the tank vent pipe can be easily attached and detached.

[0058] <11> A method for attaching and detaching a net according to one aspect of the present invention is <1> from <8> A method for attaching and detaching a net in a cartridge-type net according to any one of the above aspects, wherein the net is attached and detached to and from the tube by attaching and detaching the cartridge through the opening.

[0059] According to this method of attaching and detaching the net, the net can be attached and detached to the tube by attaching and detaching the cartridge to an opening provided in advance in the tube, so that the net can be easily attached and detached to a predetermined position in the tube. [Explanation of symbols]

[0060] 10...Tank, 11...tank body, 11a...upper wall, 12...vent pipe, 13...vent pipe body, 20...Cartridge type net, 21...1st board, 21a...through hole, 22...Second board, 22a...through hole, 23...cartridge, 24...opening, 26...Gasket, 26a...Aperture, 31...Cartridge body, 32...net, 33...board, 33a...through opening, 33b...support frame, 34a...Butterfly bolt, 34b...wing nut, 35...protrusion, 36...handle, L…tube shaft

Claims

1. A cartridge disposed between a first plate provided on a tube and a second plate attached to the first plate, The cartridge comprises: The pipe is attached to and detached from the pipe through an opening provided between the first plate and the second plate, The cartridge comprises: A cartridge body; a net attached to the cartridge body and positioned on the axis of the tube when attached to the tube;

2. The cartridge-type mesh of claim 1 , wherein at least one of the first plate and the second plate is a flange.

3. a packing sandwiched between the first plate and the second plate; The cartridge-type net according to claim 1 , wherein the opening is formed in the packing.

4. The packing has a C-shape in a plan view with an opening in a part of the circumferential direction, The cartridge-type net according to claim 3 , wherein the opening is formed in a part of the circumferential direction by an opening in the packing.

5. The cartridge-type net according to claim 1 , wherein the first plate and the second plate are formed in an annular shape.

6. The cartridge body includes a pair of plates that sandwich the mesh therebetween, The cartridge-type net according to claim 1 , wherein the net is exposed to the outside of the cartridge through through-holes provided in the pair of plates.

7. The cartridge-type net according to claim 6 , wherein the cartridge body includes bolts and nuts that sandwich the net and the pair of plates.

8. a protrusion disposed on an exterior of the tube when the cartridge is attached to the tube; The cartridge-type net according to claim 1 , wherein the protrusion is provided with a handle.

9. the tube having the first plate and the second plate; A ventilation pipe comprising a cartridge-type netting according to any one of claims 1 to 8.

10. The ventilation pipe according to claim 9; a tank body provided with the vent pipe.

11. A method for attaching and detaching a net in a cartridge-type net according to any one of claims 1 to 8, wherein the net is attached and detached to and from the tube by attaching and detaching the cartridge through the opening.

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