Spraying device for gas fire extinguishing system

Abstract

The utility model provides a spraying device for a gas fire extinguishing system. The spraying device comprises a mounting seat, a connecting assembly and a plurality of nozzles, a containing cavity is formed in the mounting base, a plurality of assembling screw holes are formed in the mounting base, and connecting screw holes are further formed in the top face of the mounting base. The connecting assembly comprises a connecting pipe and a positioning pipe, the connecting pipe is sleeved with a threaded sleeve used for locking the positioning pipe, and the positioning pipe comprises a splicing and inserting section, a first threaded section and a second threaded section which are sequentially communicated from top to bottom. A threaded column is arranged at the top of each nozzle, a flow guide cavity is formed in each threaded column, and a flow guide notch communicated with the flow guide cavity is further formed in the side wall of each threaded column. According to the spraying device for the gas fire extinguishing system, the orientation of the nozzle can be conveniently adjusted, and the spraying amount of a fire extinguishing agent of the nozzle can be conveniently controlled.

Description

Technical Field

[0001] The utility model belongs to the field of fire fighting equipment, in particular to a spraying device for a gas fire extinguishing system. Background Art

[0002] A gas fire extinguishing system is a fire extinguishing system in which the fire extinguishing agent is stored in a pressure vessel in a liquid, liquefied gas or gas state, and the fire extinguishing agent is sprayed in a gaseous state when a fire occurs. Usually, a gas fire extinguishing system mainly includes: a storage container, a delivery pipeline, a control valve group and a spraying device, wherein the spraying device is used to spray the fire extinguishing agent to the fire point to achieve the purpose of timely extinguishing the fire.

[0003] In the prior art, technicians in this field usually select nozzles as the spraying devices of the gas fire extinguishing system, so as to evenly spray the fire extinguishing agent inside the protected area. However, since the position of the pipe for installing the spraying device on the delivery pipeline in the gas fire extinguishing system is relatively fixed, and the traditional spraying device itself cannot be adjusted in direction according to the distribution of equipment in the protected area during installation, it is easy to cause dead corners for the spraying of the fire extinguishing agent in the protected area. In addition, the traditional spraying device cannot adjust the spraying amount of the fire extinguishing agent according to actual needs. When the gas fire extinguishing system is started, all the spraying devices in the protected area will spray the same volume of fire extinguishing agent. In this way, the fire extinguishing agent cannot be concentrated on the key equipment or the area where the fire starts, thereby affecting the utilization rate of the fire extinguishing agent and reducing the efficiency of fire extinguishing. Utility Model Content

[0004] In view of this, the utility model aims to provide a spray device for a gas fire extinguishing system to solve the above technical problems.

[0005] In order to achieve the above object, the technical solution of the utility model is implemented as follows:

[0006] A spraying device for a gas fire extinguishing system comprises: a mounting seat, a connecting assembly and a plurality of nozzles; a receiving cavity is provided inside the mounting seat, a mounting cone is provided at the bottom of the mounting seat, a plurality of assembly screw holes for mounting the nozzles are provided on the mounting cone, the plurality of assembly screw holes are arranged in a ring shape on the circumference of the mounting seat axis, and a connecting screw hole is also provided on the top surface of the mounting seat; the connecting assembly comprises a connecting pipe and a positioning pipe, the top end of the connecting pipe is detachably connected to the delivery pipeline of the gas fire extinguishing system, and a threaded sleeve for locking the positioning pipe is sleeved on the connecting pipe; the positioning pipe comprises a splicing section, a first threaded section and a second threaded section which are connected in sequence from top to bottom, the splicing section splicing section splicing section The bottom end of the connecting pipe is inserted into the connecting pipe, the first threaded section is detachably arranged inside the threaded sleeve, and the second threaded section is detachably arranged inside the connecting screw hole; a positioning strip is arranged on the outer wall of the splicing section, and a plurality of positioning grooves for accommodating the positioning strip are arranged on the inner wall of the connecting pipe, and the plurality of positioning grooves are arranged in a ring shape on the circumference of the axis of the connecting pipe; a threaded column is arranged on the top of each nozzle, and the top end of the threaded column is inserted into the accommodating cavity through the assembly screw hole, a guide cavity is arranged inside the threaded column, and the nozzle is connected with the guide cavity; a guide cutout connected with the guide cavity is also provided on the side wall of the threaded column, and the length direction of the guide cutout is parallel to the axial direction of the threaded column.

[0007] Furthermore, the connecting pipe includes a connecting section, a load-bearing section and an installation section which are connected in sequence from top to bottom, and the outer diameter of the load-bearing section is larger than the outer diameter of the installation section; a removable sealing ring is provided on the installation section, and the outer diameter of the sealing ring is larger than the outer diameter of the load-bearing section; the threaded sleeve is sleeved on the load-bearing section, a limiting ring is provided at the top of the threaded sleeve, and the inner diameter of the limiting ring is equal to the outer diameter of the load-bearing section.

[0008] Furthermore, the positioning tube also includes a limiting section, which is arranged between the first threaded section and the second threaded section, and the outer diameter of the limiting section is larger than the inner diameter of the connecting screw hole.

[0009] Furthermore, the connection assembly also includes a guide tube, and the guide tube is arranged at the bottom of the positioning tube.

[0010] Furthermore, the guide pipe includes a first guide section, a first reducing section, a second guide section, a second reducing section and a third guide section which are connected in sequence from top to bottom, the inner diameter of the first guide section is equal to the inner diameter of the positioning connecting pipe, the inner diameter of the second guide section is smaller than the inner diameter of the first guide section, and the inner diameter of the third guide section is smaller than the inner diameter of the second guide section.

[0011] Furthermore, the nozzle is provided with a first hole group and a second hole group, the first hole group is located on a side of the second hole group close to the threaded column, the first hole group includes a plurality of first injection holes arranged in a ring shape, the second hole group includes a plurality of second injection holes arranged in a ring shape, and the aperture of the first injection hole is larger than the aperture of the second injection hole.

[0012] Furthermore, there are three assembly screw holes, and the angle between any two adjacent assembly screw holes is 120 degrees.

[0013] Furthermore, there are eight positioning grooves, and the angle between any two adjacent positioning grooves is 45 degrees.

[0014] Compared with the prior art, the spraying device for a gas fire extinguishing system described in the utility model has the following advantages:

[0015] (1) The utility model discloses a spraying device for a gas fire extinguishing system, wherein a positioning strip is provided on the positioning pipe and a plurality of positioning grooves are provided on the connecting pipe. When assembling the device, the staff can first install the connecting pipe on the delivery pipeline of the gas fire extinguishing system, and then adjust the orientation of the mounting seat according to the position of the equipment in the protection zone so that the plurality of nozzles on the mounting seat are aligned with the equipment to be protected, and then insert the positioning strip into the corresponding positioning groove, and use the threaded sleeve to achieve circumferential limit on the positioning pipe to prevent the mounting seat and the positioning pipe from rotating during use. In addition, the nozzle in the device is connected to the assembly screw hole through a threaded column, and a guide cut is provided on the threaded column. During assembly, the staff can adjust the screw-in depth of each threaded column according to the fire extinguishing agent requirements of different equipment, so that different nozzles obtain different air intakes, thereby facilitating the adjustment of the fire extinguishing agent injection amount of each nozzle, improving the fire extinguishing agent utilization rate of the gas fire extinguishing system, and accelerating the fire extinguishing speed.

[0016] (2) The utility model discloses a spraying device for a gas fire extinguishing system, wherein the flow guide pipe comprises a first flow guide section, a second flow guide section and a third flow guide section, the inner diameters of which gradually decrease. When the gaseous fire extinguishing agent enters the receiving cavity along the flow guide pipe, the gradually decreasing inner diameters of the first flow guide section, the second flow guide section and the third flow guide section can increase the flow velocity and flow pressure of the fire extinguishing agent, thereby increasing the spraying range of the fire extinguishing agent of the device.

[0017] (3) The spray device for a gas fire extinguishing system described in the utility model is provided with a sealing ring on the connecting pipe and a limiting section on the positioning pipe. After assembly, the sealing ring and the limiting section can seal the joint gap in the device, thereby improving the air tightness of the gap and preventing the fire extinguishing agent from flowing outward along the joint gap. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the accompanying drawings:

[0019] Figure 1 It is a structural schematic diagram of a spray device for a gas fire extinguishing system according to an embodiment of the utility model;

[0020] Figure 2 A schematic diagram of the bottom structure of a spray device for a gas fire extinguishing system according to an embodiment of the utility model;

[0021] Figure 3 It is a cross-sectional schematic diagram of a spray device for a gas fire extinguishing system according to an embodiment of the utility model;

[0022] Figure 4 An exploded view of a spray device for a gas fire extinguishing system according to an embodiment of the utility model;

[0023] Figure 5 This is a structural schematic diagram of a connecting pipe according to an embodiment of the utility model;

[0024] Figure 6 It is a schematic structural diagram of the nozzle and the threaded column described in an embodiment of the utility model.

[0025] Description of reference numerals:

[0026] 1-mounting seat; 11-accommodating cavity; 12-mounting cone; 13-assembling screw hole; 14-connecting screw hole; 21-connecting section; 22-bearing section; 23-mounting section; 24-positioning groove; 31-insertion section; 311-positioning strip; 32-first threaded section; 33-limiting section; 34-second threaded section; 4-threaded sleeve; 5-nozzle; 51-threaded column; 52-guiding cavity; 53-guiding cutout; 54-first injection hole; 55-second injection hole; 6-sealing ring; 71-first guide section; 72-first reducing section; 73-second guide section; 74-second reducing section; 75-third guide section. DETAILED DESCRIPTION

[0027] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0028] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, "multiple" means two or more.

[0029] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0030] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0031] The invention discloses a spraying device for a gas fire extinguishing system, which is used to be installed on a delivery pipeline of the gas fire extinguishing system so as to spray a fire extinguishing agent into a protected area and put out a fire in time. Figure 1-Figure 6 It is a schematic diagram of a spraying device for a gas fire extinguishing system. As shown in the figure, in this embodiment, the spraying device for a gas fire extinguishing system includes: a mounting seat 1, a connecting assembly and a plurality of nozzles 5, wherein the mounting seat 1 is used to provide a mounting base for the plurality of nozzles 5, and the connecting assembly is used to achieve communication between the mounting seat 1 and a delivery pipeline of the gas fire extinguishing system.

[0032] like Figure 1-Figure 4As shown, the mounting seat 1 is provided with a receiving cavity 11 for receiving and distributing the fire extinguishing agent, and a connecting screw hole 14 for assembling the connecting assembly is provided on the top surface of the mounting seat 1. In order to realize the assembly between the nozzle 5 and the mounting seat 1, a mounting cone 12 should be provided at the bottom of the mounting seat 1, and a plurality of mounting screw holes 13 are provided on the mounting cone 12, and the plurality of mounting screw holes 13 are arranged in a ring shape around the axis of the mounting seat 1. During assembly, the staff can install the plurality of nozzles 5 on the plurality of mounting screw holes 13 one by one, so that the plurality of nozzles 5 in the device can form a larger fire extinguishing agent spraying range by means of the mounting cone 12.

[0033] In the prior art, the installation direction of the spraying device cannot be flexibly adjusted, so the staff cannot ensure that the fire extinguishing agent sprayed by the spraying device accurately acts on the equipment to be protected in the protected area. To solve this problem, the connection assembly described in this embodiment includes a connecting pipe and a positioning pipe, wherein the top of the connecting pipe is detachably connected to the delivery pipe of the gas fire extinguishing system through a thread, and a threaded sleeve 4 for locking the positioning pipe is sleeved on the connecting pipe, and the positioning pipe includes an insert section 31, a first thread section 32 and a second thread section 34 connected in sequence from top to bottom. During assembly, the insert section 31 is inserted into the bottom end of the connecting pipe, the first thread section 32 is detachably arranged inside the threaded sleeve 4 by means of a threaded connection, and the second thread section 34 is detachably arranged inside the connecting screw hole 14 by means of a threaded connection.

[0034] Since the positioning tube and the connecting tube are connected by splicing, during assembly, the staff can first drive the mounting base 1 to rotate according to the distribution of equipment in the protection zone, so that the nozzle 5 on the mounting base 1 is aligned with the equipment to be protected, and then lock the positioning tube by the threaded sleeve 4 to achieve axial limitation of the positioning tube.

[0035] In addition, in order to facilitate the staff to control the orientation angle of the mounting seat 1, a positioning strip 311 should be provided on the outer wall of the splicing section 31, and a plurality of positioning grooves 24 should be provided on the inner wall of the connecting pipe, and the plurality of positioning grooves 24 are arranged in a ring shape around the axis of the connecting pipe. Before inserting the splicing section 31 into the connecting pipe, the staff can select the positioning groove 24 according to the orientation requirements of the mounting seat 1, and insert the positioning strip 311 into the selected positioning groove 24, so as to avoid relative rotation between the positioning pipe and the connecting pipe, so as to reduce the assembly difficulty of the device.

[0036] As an optional implementation of this embodiment, eight positioning grooves 24 can be opened on the inner wall of the connecting pipe, and the angle between any two adjacent positioning grooves 24 is 45 degrees, so as to meet the different orientation requirements of the mounting seat 1 in daily work.

[0037] Optionally, to improve the air tightness of the connection components at the joint gap, such as Figure 4 and Figure 5 As shown, the connecting pipe may include a connecting section 21, a bearing section 22 and a mounting section 23 which are connected in sequence from top to bottom. The outer diameter of the bearing section 22 is larger than the outer diameter of the mounting section 23, a detachable sealing ring 6 is provided on the mounting section 23, and the outer diameter of the sealing ring 6 is larger than the outer diameter of the bearing section 22, and a limiting ring is also provided at the top of the threaded sleeve 4, and the inner diameter of the limiting ring is equal to the outer diameter of the bearing section 22.

[0038] During assembly, the staff can first sleeve the threaded sleeve 4 on the bearing section 22, then install the sealing ring 6 on the installation section 23, then assemble the top of the connecting pipe to the delivery pipe of the gas fire extinguishing system, and insert the splicing section 31 of the positioning pipe into the bottom of the connecting pipe, and finally rotate the threaded sleeve 4 downward to make the threaded sleeve 4 mesh with the first threaded section 32. At this time, the bottom surface of the limit ring and the top surface of the first threaded section 32 will fit the upper and lower end surfaces of the sealing ring 6 respectively, so that the splicing gap between the connecting pipe and the positioning pipe is blocked by the sealing ring 6.

[0039] In addition, the positioning pipe may also include a limiting section 33, such as Figure 4 As shown, the limiting section 33 should be arranged between the first thread section 32 and the second thread section 34, and the outer diameter of the limiting section 33 should be larger than the inner diameter of the connecting screw hole 14. When the second thread section 34 is inserted into the connecting screw hole 14, the bottom surface of the limiting section 33 will block the joint gap between the connecting screw hole 14 and the second thread section 34, thereby further improving the sealing effect of the device.

[0040] In the prior art, the spraying device of the gas fire extinguishing system still has the problem that the amount of fire extinguishing agent sprayed by each nozzle cannot be independently controlled. Figure 6 As shown, in this embodiment, a threaded column 51 is provided at the top of each nozzle 5, a flow guiding cavity 52 is provided inside the threaded column 51, and the nozzle 5 is connected to the flow guiding cavity 52. ​​In addition, a flow guiding cutout 53 connected to the flow guiding cavity 52 is provided on the side wall of the threaded column 51, and the length direction of the flow guiding cutout 53 is parallel to the axial direction of the threaded column 51.

[0041] During assembly, the staff can insert the top of the threaded column 51 into the accommodating cavity 11 through the assembly screw hole 13, so that the guide cutout 53 is connected to the accommodating cavity 11, so that the fire extinguishing agent entering the device is conveniently sprayed outward along the nozzle 5. When it is necessary to adjust the amount of fire extinguishing agent sprayed by each nozzle 5 in the device, the staff can adjust the screw-in depth of each spiral column 51 according to actual needs. Since the length direction of the guide cutout 53 is parallel to the axial direction of the threaded column 51, when the screw-in depth of the spiral column 51 increases, the length of the guide cutout 53 inserted into the accommodating cavity 11 will increase, so that the air intake of the nozzle 5 can be increased, so that the nozzle 5 can obtain a larger amount of fire extinguishing agent spray. Correspondingly, when the screw-in depth of the spiral column 51 decreases, the length of the guide cutout 53 inserted into the accommodating cavity 11 will decrease, so the air intake of the nozzle 5 will decrease, thereby reducing the amount of fire extinguishing agent sprayed by the nozzle 5.

[0042] As another optional implementation of this embodiment, the mounting base 1 may be provided with three assembly screw holes 13, and the angle between any two adjacent assembly screw holes 13 is 120 degrees. Since the angle between two adjacent assembly screw holes 13 is different from the angle between two adjacent positioning grooves 24, the adjustment capability of the orientation of the nozzle 5 of the device can be improved to meet more types of usage requirements.

[0043] In order to improve the fire extinguishing agent spraying effect of the nozzle 5, the present embodiment may be provided with a first hole group and a second hole group on the nozzle 5, wherein the first hole group is located on the side of the second hole group close to the threaded column 51, the first hole group includes a plurality of first spray holes 54 arranged in a ring shape, the second hole group includes a plurality of second spray holes 55 arranged in a ring shape, and the aperture of the first spray hole 54 is larger than the aperture of the second spray hole 55. When the fire extinguishing agent enters the interior of the nozzle 5, since the first hole group is located on the side of the second hole group close to the threaded column 51, and the aperture of the first spray hole 54 is larger than the aperture of the second spray hole 55, a large amount of fire extinguishing agent will be sprayed along the first spray hole 54, so that the nozzle 5 obtains a larger spray range. Correspondingly, since the device is also provided with a second spray hole 55 with a smaller aperture on the nozzle 5, the remaining fire extinguishing agent in the nozzle 5 will be sprayed along the second spray hole 55 at a higher spray pressure, thereby improving the utilization rate of the fire extinguishing agent of the nozzle 5.

[0044] As another optional implementation of this embodiment, in order to increase the flow rate and pressure of the fire extinguishing agent after entering the device, the connecting assembly may further include a guide pipe, and the guide pipe is arranged at the bottom of the positioning pipe. Figure 3As shown, the guide pipe may include a first guide section 71, a first diameter-reducing section 72, a second guide section 73, a second diameter-reducing section 74 and a third guide section 75 which are connected in sequence from top to bottom, wherein the inner diameter of the first guide section 71 is equal to the inner diameter of the positioning pipe, the inner diameter of the second guide section 73 is smaller than the inner diameter of the first guide section 71, and the inner diameter of the third guide section 75 is smaller than the inner diameter of the second guide section 73. Since the inner diameters of the first guide section 71, the second guide section 73 and the third guide section 75 gradually decrease, when the gaseous fire extinguishing agent flows through the guide pipe, the flow velocity and flow pressure of the fire extinguishing agent will increase, so that the device can have a larger fire extinguishing agent spray range and a larger fire extinguishing agent spray flow rate, thereby improving the fire extinguishing efficiency of the device.

[0045] The effects of the above scheme are described below:

[0046] This embodiment provides a spraying device for a gas fire extinguishing system, which can facilitate the staff to adjust the orientation of the mounting seat by cooperating with the positioning pipe and the connecting pipe, and can also adjust the amount of fire extinguishing agent sprayed by each nozzle by changing the screw-in depth of the threaded column, so as to meet different usage requirements. Secondly, this device can increase the flow rate and pressure of the fire extinguishing agent through the guide pipe, so that the device can obtain a larger fire extinguishing agent spray range and a larger fire extinguishing agent spray flow rate. In addition, this device can also block the splicing gap in the connecting component, so as to obtain a good airtight effect.

[0047] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A spraying device for a gas fire extinguishing system, characterized in that: include: A mounting seat (1), a connecting assembly and a plurality of nozzles (5); a receiving cavity (11) is provided inside the mounting seat (1); a mounting cone (12) is provided at the bottom of the mounting seat (1); a plurality of assembly screw holes (13) for mounting the nozzles (5) are provided on the mounting cone (12); the plurality of assembly screw holes (13) are arranged in a ring shape on the circumferential side of the axis of the mounting seat (1); and a connecting screw hole (14) is also provided on the top surface of the mounting seat (1); the connecting assembly comprises a connecting pipe and a positioning pipe; the top end of the connecting pipe is detachably connected to the delivery pipeline of the gas fire extinguishing system, and a threaded sleeve (4) for locking the positioning pipe is sleeved on the connecting pipe; the positioning pipe comprises an inserting section (31), a first threaded section (32) and a second threaded section (34) which are connected in sequence from top to bottom; the inserting section (31) is inserted into the bottom end of the connecting pipe, and the first threaded section (32) is detachably connected to the delivery pipeline of the gas fire extinguishing system. The second threaded section (34) is detachably arranged inside the threaded sleeve (4); a positioning strip (311) is arranged on the outer wall of the splicing section (31); a plurality of positioning grooves (24) for accommodating the positioning strip (311) are arranged on the inner wall of the connecting pipe, and the plurality of positioning grooves (24) are arranged in a ring shape on the circumference of the axis of the connecting pipe; a threaded column (51) is arranged on the top of each nozzle (5), and the top end of the threaded column (51) is inserted into the accommodating cavity (11) through the assembly screw hole (13); a flow guiding cavity (52) is arranged inside the threaded column (51), and the nozzle (5) is connected to the flow guiding cavity (52); a flow guiding notch (53) connected to the flow guiding cavity (52) is also provided on the side wall of the threaded column (51), and the length direction of the flow guiding notch (53) is parallel to the axial direction of the threaded column (51).

2. A spraying device for a gas fire extinguishing system according to claim 1, characterized in that: The connecting pipe comprises a connecting section (21), a bearing section (22) and a mounting section (23) which are connected in sequence from top to bottom, and the outer diameter of the bearing section (22) is larger than the outer diameter of the mounting section (23); a detachable sealing ring (6) is provided on the mounting section (23), and the outer diameter of the sealing ring (6) is larger than the outer diameter of the bearing section (22); the threaded sleeve (4) is sleeved on the bearing section (22), a limiting ring is provided at the top end of the threaded sleeve (4), and the inner diameter of the limiting ring is equal to the outer diameter of the bearing section (22).

3. A spraying device for a gas fire extinguishing system according to claim 1, characterized in that: The positioning pipe further comprises a limiting section (33), wherein the limiting section (33) is arranged between the first thread section (32) and the second thread section (34), and the outer diameter of the limiting section (33) is greater than the inner diameter of the connecting screw hole (14).

4. A spraying device for a gas fire extinguishing system according to claim 1, characterized in that: The connection assembly also includes a flow guide pipe, and the flow guide pipe is arranged at the bottom of the positioning pipe.

5. A spraying device for a gas fire extinguishing system according to claim 4, characterized in that: The guide pipe comprises a first guide section (71), a first diameter-reducing section (72), a second guide section (73), a second diameter-reducing section (74) and a third guide section (75) which are connected in sequence from top to bottom; the inner diameter of the first guide section (71) is equal to the inner diameter of the positioning pipe; the inner diameter of the second guide section (73) is smaller than the inner diameter of the first guide section (71); and the inner diameter of the third guide section (75) is smaller than the inner diameter of the second guide section (73).

6. A spraying device for a gas fire extinguishing system according to claim 1, characterized in that: The nozzle (5) is provided with a first hole group and a second hole group, the first hole group is located on a side of the second hole group close to the threaded column (51), the first hole group includes a plurality of first injection holes (54) arranged in a ring shape, the second hole group includes a plurality of second injection holes (55) arranged in a ring shape, and the aperture of the first injection hole (54) is larger than the aperture of the second injection hole (55).

7. A spraying device for a gas fire extinguishing system according to claim 1, characterized in that: There are three assembly screw holes (13), and the angle between any two adjacent assembly screw holes (13) is 120 degrees.

8. The spraying device for a gas fire extinguishing system according to claim 1, characterized in that: There are eight positioning grooves (24), and the angle between any two adjacent positioning grooves (24) is 45 degrees.

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