A switch cabinet fire-probe extinguishing system

Abstract

The application belongs to the technical field of fire fighting, and discloses a switch cabinet fire detecting tube fire extinguishing system, which comprises fire detecting tubes and fire extinguishing tanks arranged on the inner and outer sides of the switch cabinet respectively, the fire detecting tubes are fixed on the inner wall of the switch cabinet in an "S" shape through mounting rings, the other end of the fire detecting tube is communicated with a pressure increasing mechanism, and the horizontal part of the outer surface of the fire detecting tube is sleeved with a heat exchanging mechanism. The expansion force of kerosene generated by heating pushes the piston and the sealing gasket to the right, in the early stage of overload of the electrical equipment, the contact column contacts the fire detecting tube and absorbs heat, and then the kerosene in the sleeve ring, the sleeve ring, the heat conducting sheet and the heat conducting pipe is guided into the inner cavity of the sealing cylinder, the kerosene is used for continuously increasing the pressure of the fire extinguishing agent in the fire detecting tube before the electrical equipment is on fire, the breaking point is squeezed out at the moment when the electrical equipment is on fire or even before the electrical equipment is on fire, the breaking speed is effectively increased, and the safety factor of the system for extinguishing fire is improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of fire fighting, and particularly relates to a switch cabinet fire detecting tube fire extinguishing system. BACKGROUND

[0002] Various electrical devices are distributed in the switch cabinet, and when working, the relatively closed space in the cabinet body is easy to cause the electrical devices to generate high temperature at various times, and the temperature in the cabinet body is increased, and the electrical devices will be burned out or even cause open fire when working beyond the load, at this time, fire extinguishing needs to be performed in time.

[0003] In the prior art, a fire extinguishing tank and a fire detecting tube are used for automatic fire extinguishing, the fire extinguishing tank is arranged outside the switch cabinet, and the fire detecting tube is distributed at potential fire points in the switch cabinet, the fire detecting tube is broken after encountering high temperature combustion, and is rigid within a certain time, so that the fire extinguishing agent in the fire extinguishing tank is sprayed out through the broken point of the fire detecting tube, and the purpose of fire extinguishing is achieved.

[0004] However, the fire detecting tube needs to be combusted by open fire and high temperature to be broken, even if the fire can be extinguished, the electrical devices in the switch cabinet will also affect other devices, and in the process of overloading of the electrical devices to combustion, the temperature around the broken point of the fire detecting tube will have a significant upward trend, but since the pressure of the fire extinguishing agent in the fire detecting tube is constant, the fire detecting tube needs to be combusted by open fire to be broken and extinguished, which greatly increases the high temperature damage to the electrical devices in the switch cabinet, and if the pressure in the fire detecting tube can be increased at the initial stage of overloading of the electrical devices by using the high temperature generated by the electrical devices, the broken and extinguishing function of the fire detecting tube can be triggered more quickly. SUMMARY

[0005] The application aims to provide a switch cabinet fire detecting tube fire extinguishing system to solve the problems in the background.

[0006] In order to achieve the above-mentioned purpose, the application provides the following technical scheme: a switch cabinet fire detecting tube fire extinguishing system, comprising a fire detecting tube and a fire extinguishing tank arranged on the inner and outer sides of the switch cabinet respectively, the fire detecting tube is fixed on the inner wall of the switch cabinet in an "S" shape through a mounting ring, the other end of the fire detecting tube is communicated with a pressure increasing mechanism, the horizontal part of the outer surface of the fire detecting tube is sleeved with a heat exchange mechanism, and each group of the heat exchange mechanisms are connected through a heat conduction mechanism.

[0007] The pressure increasing mechanism comprises a sealing cylinder, a connecting head is connected to the right end of the sealing cylinder, a through opening is formed in the left end of the sealing cylinder, and a heat conduction pipe and a fixing ring are sealingly sleeved, a heat conduction sheet is welded to the left end of the heat conduction pipe, a piston is sealingly installed on the inner wall of the sealing cylinder through a sealing gasket, and kerosene is filled in the left side of the inner cavity of the sealing cylinder;

[0008] The heat exchange mechanism comprises two groups of fitting columns symmetrically arranged on the upper and lower sides of the outer surface of the fire detection tube, the two ends of the fitting column are fixedly connected with a limiting column, a sleeve ring is sleeved on the limiting column through limiting, the upper and lower sides of the end surface of the sleeve ring are provided with through grooves, and a tightening ring is press-fitted between the limiting column and the sleeve ring.

[0009] The heat conduction mechanism comprises a connecting column, the upper and lower ends of the connecting column are welded with heat conduction rings, the heat conduction rings are fixedly connected with sleeve rings, and the other side of the heat conduction ring is fixedly connected with a fixed column.

[0010] Preferably, the sealing gasket is arranged in two groups and is glued to the left and right ends of the piston respectively, the sealing gasket is made of a rubber block and is in interference fit with the inner wall of the sealing cylinder.

[0011] Preferably, the inner wall of the sealing cylinder is further provided with two groups of guide columns symmetrically arranged in the upper and lower sides, the piston and the sealing gasket are both adapted to be sleeved on the outer surface of the sealing cylinder and move along the axis of the sealing cylinder.

[0012] Preferably, the top end of the heat conduction sheet is welded with the heat conduction ring located on the lower side, and the heat conduction pipe, the heat conduction sheet, the fixed ring, the heat conduction ring, the connecting column, the sleeve ring, the limiting column and the fitting column are all made of copper sheets.

[0013] Preferably, the cross-sectional shape of the limiting column is "T" shape, one end of the limiting column connected with the fitting column is adapted to be clamped on the inner wall of the through groove and can be limited to rotate on the inner wall of the through groove along the axis of the sleeve ring.

[0014] Preferably, the heat exchange mechanism is arranged in three groups and is arranged on three horizontal parts of the outer surface of the fire detection tube, the right end of the sleeve ring located on the right side and the left end of the sleeve ring located on the top are fixedly connected with mounting rods, and the other end of the mounting rod is fixedly connected with the inner wall of the switch cabinet.

[0015] Preferably, the right end of the heat conduction pipe is limited to abut against the sealing gasket, the fixed ring is fixedly installed on the left side of the inner wall of the sealing cylinder, and the heat conduction pipe is in interference fit with the inner annular surface of the fixed ring.

[0016] Preferably, the outer surface of the guide column movably sleeved with a spring, the two ends of the spring are elastically connected with the sealing cylinder and the sealing gasket located on the left side respectively.

[0017] The beneficial effects of the present application are as follows:

[0018] 1. The fire extinguishing system adds a pressurizing mechanism to realize the pressurizing function of the fire extinguishing tank and the fire detection tube, the high-temperature heat of the ignition point on the surface of the fire detection tube is transmitted to the kerosene in the inner cavity of the sealing cylinder through the heat exchange mechanism and the heat conduction mechanism, and the expansion force generated by the heated kerosene pushes the piston and the sealing gasket to the right, in the early stage of the overload of the electrical equipment, the contact column contacts the fire detection tube and absorbs heat, and then the kerosene in the inner cavity of the sealing cylinder is introduced into the kerosene through the sleeve ring, the heat conduction sheet and the heat conduction pipe, and the kerosene is expanded before the electrical equipment is on fire, which can extrude the breaking point at the moment of the electrical equipment on fire, or even before the electrical equipment is on fire, effectively increase the breaking speed, and improve the safety factor of the system fire extinguishing.

[0019] 2. Then, the contact column contacts the upper and lower sides of the horizontal part of the outer surface of the fire detection tube in addition to heat conduction, when the burning breaking point of the fire detection tube contacts the contact column, the huge pressure generated by the internal fire extinguishing agent of the contact column must act on the contact column, at the moment of breaking, the fire extinguishing agent is scattered and sprayed under the blocking and limiting action of the contact column, the spraying area is larger, thereby reducing the temperature of other equipment positions and reducing the fire degree.

[0020] 3. Finally, the heat storage property of kerosene makes the use of the fire detection tube have multiple times, that is, in the same time period, if at least two electrical equipment overloads and fires in the switch cabinet, and causes two or more breaking points on the outer surface of the fire detection tube, the heat absorbed by the contact column, the sleeve ring, the heat conduction sheet and the heat conduction pipe is continuously introduced into the kerosene in the inner cavity of the sealing cylinder, and the kerosene is continuously pushed by the piston and the sealing gasket through the expansion of the kerosene, and the pressure of the fire extinguishing agent is increased, so that multiple ignition points can obtain the same and standard fire extinguishing agent spraying pressure, which can significantly improve the fire extinguishing performance of the system. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is a front view of the structure of the application;

[0022] Figure 2 It is a perspective view of the structure of the application;

[0023] Figure 3 It is an enlarged view of the structure of A in the application; Figure 2

[0024] Figure 4 It is a cooperation diagram of the fire extinguishing tank, the fire detection tube, the mounting ring, the mounting rod, the pressurizing mechanism, the heat conduction mechanism and the heat exchange mechanism of the application;

[0025] Figure 5 It is a front view of the pressurizing mechanism, the heat conduction mechanism and the heat exchange mechanism of the application;

[0026] Figure 6 It is a front view of the pressurizing mechanism, the heat conduction mechanism and the heat exchange mechanism of the application; Figure 5 ​An enlarged schematic view of the structure at B;

[0027] Figure 7 A separation schematic view of the heat exchange mechanism of the present application Figure 5 An enlarged schematic view of the structure at C;

[0028] Figure 8 A separation schematic view of the heat exchange mechanism of the present application

[0029] Figure 9 A separation schematic view of the heat exchange mechanism of the present application

[0030] Figure 10 A separation schematic view of the heat exchange mechanism of the present application

[0031] In the figure: 1, switch cabinet; 2, fire extinguishing tank; 3, fire detection tube; 4, mounting ring; 5, mounting rod; 6, pressure increasing mechanism; 61, sealing cylinder; 62, connecting head; 63, heat conducting pipe; 64, heat conducting sheet; 65, fixing ring; 66, guide column; 67, piston; 68, sealing gasket; 69, spring; 7, heat conducting mechanism; 71, connecting column; 72, heat conducting ring; 73, fixing column; 8, heat exchange mechanism; 81, fitting column; 82, sleeve ring; 83, limiting column; 84, tightening ring; 85, through slot. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0033] As Figures 1 to 10 shown, the embodiment of the present application provides a fire detection tube fire extinguishing system of a switch cabinet, which comprises fire detection tubes 3 and fire extinguishing tanks 2 arranged respectively on the inner and outer sides of a switch cabinet 1, the fire detection tubes 3 are fixed in an "S" shape on the inner wall of the switch cabinet 1 through mounting rings 4, the other end of the fire detection tubes 3 is communicated with pressure increasing mechanisms 6, the horizontal part of the outer surface of the fire detection tubes 3 is sleeved with heat exchange mechanisms 8, and each group of heat exchange mechanisms 8 is heat conducting connected through heat conducting mechanisms 7.

[0034] The pressure increasing mechanism 6 comprises a sealing cylinder 61, the right end of the sealing cylinder 61 is connected with a connecting head 62, the left end of the sealing cylinder 61 is provided with a through opening, and the sealing cylinder 61 is sealingly sleeved with a heat conducting pipe 63 and a fixing ring 65, the left end of the heat conducting pipe 63 is welded with a heat conducting sheet 64, the inner wall of the sealing cylinder 61 is sealingly installed with a piston 67 through a sealing gasket 68, and the left side of the inner cavity of the sealing cylinder 61 is filled with kerosene.

[0035] The heat exchange mechanism 8 comprises two groups of symmetrical distribution on the outer surface of the fire detection tube 3 upper and lower sides of the fit column 81, both ends of the fit column 81 are fixedly connected with the limiting column 83, and the limiting column 83 is sleeved with the sleeve ring 82 through the limiting column 83, the upper and lower sides of the end surface of the sleeve ring 82 are provided with the through slot 85, and the limiting column 83 and the sleeve ring 82 are press-fitted with the tightening ring 84;

[0036] The heat conduction mechanism 7 comprises a connecting column 71, and the upper and lower ends of the connecting column 71 are welded with heat conduction rings 72, the heat conduction rings 72 are fixedly connected with the sleeve ring 82, and the other side of the heat conduction ring 72 is fixedly connected with a fixed column 73;

[0037] The fire extinguishing system adds the pressurizing mechanism 6 to realize the pressurizing function of the fire extinguishing tank 2 and the fire detection tube 3, the heat exchange mechanism 8 and the heat conduction mechanism 7 are arranged to transfer the high-temperature heat of the ignition point on the surface of the fire detection tube 3 to the kerosene in the inner cavity of the sealing cylinder 61, and the expansion force generated by the kerosene heated is used to push the piston 67 and the sealing gasket 68 to the right, in the early stage of the overload of the electrical equipment, the fit column 81 is used to contact the fire detection tube 3 and absorb heat, and then the sleeve ring 82, the sleeve ring 82, the heat conduction sheet 64 and the heat conduction pipe 63 are used to guide the kerosene into the inner cavity of the sealing cylinder 61, the kerosene is expanded to continuously pressurize the fire extinguishing agent in the fire detection tube 3 before the electrical equipment is ignited, the broken point can be squeezed out at the moment of the ignition of the electrical equipment or even before the ignition, the broken speed is effectively increased, and the safety factor of the system fire extinguishing is improved.

[0038] Then, the fit column 81 is used to contact the upper and lower sides of the horizontal part of the outer surface of the fire detection tube 3 in addition to heat conduction, when the combustion broken point of the fire detection tube 3 contacts the fit column 81, the great pressure of the fire extinguishing agent in the fire detection tube 3 must act on the fit column 81, in the moment of breaking, the fit column 81 is pressed, and the fire extinguishing agent is scattered and sprayed under the blocking and limiting action of the fit column 81, the spraying area is larger, so that the temperature of other equipment positions is reduced, and the fire degree is reduced.

[0039] Finally, the heat storage property of the kerosene is used to make the use of the fire detection tube 3 have multiple times, that is, in the same time period, if at least two electrical equipment overloads and ignitions occur in the switch cabinet 1, and two or more broken points occur on the outer surface of the fire detection tube 3, the heat absorbed by the fit column 81, the sleeve ring 82, the sleeve ring 82, the heat conduction sheet 64 and the heat conduction pipe 63 is continuously introduced into the kerosene in the inner cavity of the sealing cylinder 61, and the kerosene is expanded to continuously push the piston 67 and the sealing gasket 68, the fire detection tube 3 is pressurized, and the multiple ignition points can obtain the same and standard fire extinguishing agent spraying pressure, and the fire extinguishing performance of the system can be significantly improved.

[0040] The sealing gasket 68 is provided in two groups and is glued to the left and right ends of the piston 67, the sealing gasket 68 is made of a rubber block and is in interference fit with the inner wall of the sealing cylinder 61;

[0041] The left and right groups of sealing pads 68 are respectively in contact with kerosene and fire extinguishing agent, and cooperate with the piston 67 to dynamically isolate the internal space of the sealing cylinder 61, so as to realize the sealing function.

[0042] The inner wall of the sealing cylinder 61 is further provided with two groups of guide columns 66 which are symmetrically distributed upward and downward, and the piston 67 and the sealing pad 68 are both adapted to be connected to the outer surface of the sealing cylinder 61 and move along the axis of the sealing cylinder 61;

[0043] The guide column 66 is used to provide a guiding effect for the movement of the piston 67 and the sealing pad 68, reduce the resistance of the piston 67 and the sealing pad 68 during movement, and reduce the loss of kerosene expansion energy.

[0044] The top end of the heat conduction sheet 64 is welded with the heat conduction ring 72 located on the lower side, and the heat conduction pipe 63, the heat conduction sheet 64, the fixed ring 65, the heat conduction ring 72, the connecting column 71, the sleeve ring 82, the limiting column 83 and the fitting column 81 are all made of copper sheet;

[0045] The heat conduction pipe 63, the heat conduction sheet 64, the fixed ring 65, the heat conduction ring 72, the connecting column 71, the sleeve ring 82, the limiting column 83 and the fitting column 81 are all made of heat-conducting materials, which can absorb heat in time when the electrical equipment in the switch cabinet 1 is overloaded at high temperature, and transfer the heat to the kerosene to make it expand in advance. At ordinary times, it can also absorb the heat generated in the switch cabinet 1 to maintain the normal pressure of the fire extinguishing tank 2.

[0046] The cross section of the limiting column 83 is in the shape of "T", and one end of the limiting column 83 connected to the fitting column 81 is adapted to be clamped to the inner wall of the through groove 85 and can rotate along the axis of the sleeve ring 82 within the limit of the inner wall of the through groove 85;

[0047] The limiting column 83 penetrates through the through groove 85 and is limitingly installed in the sleeve ring 82, and the sleeve ring 82 is fixedly designed, and the fitting column 81 can move along the inner wall of the through groove 85.

[0048] The heat exchange mechanism 8 is provided in three groups and is respectively distributed on the three horizontal parts of the outer surface of the fire detection pipe 3, and the right end of the sleeve ring 82 located on the right side and the left end of the sleeve ring 82 located on the top are both fixedly connected with the mounting rod 5, and the other end of the mounting rod 5 is fixedly connected with the inner wall of the switch cabinet 1;

[0049] The three groups of heat exchange mechanisms 8 are respectively in contact with and installed on the three groups of horizontal parts of the outer surface of the fire detection pipe 3, and the horizontal parts are located directly above or below the electrical equipment, which is the most likely location to catch fire, so the horizontal design of the heat exchange mechanism 8 is very reasonable.

[0050] The right end of the heat conduction pipe 63 is limitingly abutted with the sealing pad 68, the fixed ring 65 is fixedly installed on the left side of the inner wall of the sealing cylinder 61, and the heat conduction pipe 63 is in interference fit with the inner annular surface of the fixed ring 65;

[0051] When the heat pipe 63 enters the inner wall of the sealing cylinder 61, it mainly comes into contact with kerosene and transfers heat. It does not need to be fixedly connected to the piston 67 or the sealing gasket 68.

[0052] Among them, a spring 69 is movably sleeved on the outer surface of the guide post 66, and the two ends of the spring 69 are elastically connected to the sealing cylinder 61 and the sealing gasket 68 located on the left side, respectively.

[0053] Spring 69 is sleeved on the left side of the outer surface of guide post 66, and its purpose is to assist piston 67 in resetting.

[0054] Working principle and usage process:

[0055] This fire extinguishing system mainly uses fire extinguishing tank 2 to provide extinguishing agent, and extends through fire detection tube 3 to potential ignition points on the inner wall of switch cabinet 1. The fire detection tube 3 is fixed to the inner wall of switch cabinet 1 by mounting ring 4. The pressure switch on the top of fire extinguishing tank 2 controls the extinguishing agent to enter the inner wall of fire detection tube 3 and generate pressure. Under normal fire conditions, the part of the surface of fire detection tube 3 closest to the ignition point breaks first and releases the extinguishing agent to extinguish the fire.

[0056] like Figure 5 As shown, the extinguishing agent entering the fire detection tube 3 enters the right side of the inner cavity of the sealing cylinder 61 through the connector 62, and under the pressure of the fire extinguishing tank 2, it continuously pushes the piston 67 and sealing gasket 68 to the left, compressing the spring 69. The contact column 81 is attached to the outer surface of the fire detection tube 3 to absorb heat. The kerosene introduced into the inner cavity of the sealing cylinder 61 through the collar 82, the heat-conducting plate 64, and the heat-conducting pipe 63 generates high temperature when the electrical equipment inside the switch cabinet 1 is overloaded, and gradually begins to burn, producing light. At this moment, the kerosene, which is closer to the ignition point and is attached to the column 81, absorbs heat and is introduced into the inner cavity of the sealing cylinder 61 through the collar 82, the heat-conducting plate 64, and the heat-conducting pipe 63. This causes the kerosene to expand in volume, continuously pushing the piston 67 and the sealing gasket 68 to the right, pressurizing the extinguishing agent entering the inner cavity of the sealing cylinder 61. This causes the pressure inside the fire detection tube 3 to rise instantaneously, thus accelerating the burning and rupture rate of the surface of the fire detection tube 3 near the ignition point. The extinguishing agent is then sprayed outward along the rupture opening to extinguish the fire. At this time:

[0057] If the break point comes into contact with the bonding column 81, the enormous pressure generated will inevitably act on the bonding column 81. At the moment of breakage, by applying pressure to the bonding column 81, the extinguishing agent will first be blocked and limited by the bonding column 81, and its spray area will be larger, thereby reducing the temperature of other equipment locations and reducing the severity of the fire. Subsequently, under the action of the extinguishing agent, the limiting column 83 and the tightening ring 84 will rotate around the axis of the collar 82 to avoid the break point.

[0058] If the breaking point is not in contact with the fitting column 81, or even away from it, at this time, the fire extinguishing agent is ejected outwards through the breaking point, thereby realizing the fire extinguishing function, at the same time, the internal temperature of the switch cabinet 1 is still maintained at a high level for a period of time, at this time, the heat received by the fitting column 81 can still be introduced into the kerosene in the inner cavity of the sealing cylinder 61 through the sleeve ring 82, the sleeve ring 82, the heat conducting sheet 64 and the heat conducting pipe 63, so that it continues to expand, and provides a higher pressure for the already broken fire detection tube 3, when other electrical equipment is on fire, the other breaking points on the surface of the fire detection tube 3 can maintain a higher pressure when the fire extinguishing agent is ejected, thereby maintaining the normal fire extinguishing function.

[0059] It should be noted that, in this document, the terms such as first and second are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or further includes elements inherent to such process, method, article or device.

[0060] Although embodiments of the present application have been shown and described, it is to be understood that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A switch cabinet fire-probe tube fire extinguishing system comprising a fire-probe tube (3) and a fire extinguishing tank (2) arranged respectively on the inside and outside of a switch cabinet (1), characterized in that: The fire detecting tube (3) is fixed on the inner wall of the switch cabinet (1) in "S" shape through the mounting ring (4), the other end of the fire detecting tube (3) is communicated with the pressure increasing mechanism (6), the horizontal part of the outer surface of the fire detecting tube (3) is sleeved with the heat exchanging mechanism (8), each group of the heat exchanging mechanism (8) is connected through the heat conducting mechanism (7); The pressure increasing mechanism (6) comprises a sealing cylinder (61), the right end of the sealing cylinder (61) is connected with a connecting head (62), the left end of the sealing cylinder (61) is provided with a through hole, and the heat conducting pipe (63) and the fixing ring (65) are sealingly sleeved, the left end of the heat conducting pipe (63) is welded with a heat conducting sheet (64), the inner wall of the sealing cylinder (61) is sealingly installed with a piston (67) through a sealing gasket (68), and the inner cavity of the sealing cylinder (61) is filled with kerosene on the left side of the piston (67); The heat exchanging mechanism (8) comprises two groups of abutting columns (81) which are symmetrically arranged on the upper and lower sides of the outer surface of the fire detecting tube (3), the two ends of the abutting column (81) are fixedly connected with a limiting column (83), and the limiting column (83) is limitingly sleeved with a sleeve ring (82) through the limiting column (83), the upper and lower sides of the end face of the sleeve ring (82) are provided with a through groove (85), and the limiting column (83) and the sleeve ring (82) are press-fitted with a tightening ring (84); The heat conducting mechanism (7) comprises a connecting column (71), the upper and lower ends of the connecting column (71) are welded with a heat conducting ring (72), the heat conducting ring (72) is fixedly connected with the sleeve ring (82), and the other side of the heat conducting ring (72) is fixedly connected with a fixing column (73); The inner wall of the sealing cylinder (61) is also provided with two groups of guide columns (66) which are symmetrically arranged in upper and lower sides, the piston (67) and the sealing gasket (68) are adaptively sleeved on the outer surface of the sealing cylinder (61) and move along the axis of the sealing cylinder (61); The top end of the heat conducting sheet (64) is welded with the heat conducting ring (72) on the lower side, the heat conducting pipe (63), the heat conducting sheet (64), the fixing ring (65), the heat conducting ring (72), the connecting column (71), the sleeve ring (82), the limiting column (83) and the abutting column (81) are all made of copper sheet; The cross section of the limiting column (83) is "T" shape, one end of the limiting column (83) which is connected with the abutting column (81) is adaptively clamped on the inner wall of the through groove (85) and can be limitedly rotated on the inner wall of the through groove (85) along the axis of the sleeve ring (82); The outer surface of the guide column (66) is movably sleeved with a spring (69), and the two ends of the spring (69) are elastically connected with the sealing cylinder (61) and the sealing gasket (68) on the left side respectively.

2. A fire tube fire extinguishing system for a switchgear cabinet according to claim 1, characterized in that: The sealing gasket (68) is provided in two groups and is glued on the left and right ends of the piston (67), the sealing gasket (68) is made of rubber block and is interference-fitted on the inner wall of the sealing cylinder (61).

3. A fire tube fire extinguishing system for a switchgear cabinet according to claim 1, characterized in that: The heat exchange mechanism (8) is arranged in three groups and is distributed on three horizontal parts of the outer surface of the fire detecting tube (3), the right end of the sleeve ring (82) on the right side and the left end of the sleeve ring (82) on the left top are fixedly connected with the mounting rod (5), and the other end of the mounting rod (5) is fixedly connected with the inner wall of the switch cabinet (1).

4. A fire tube fire extinguishing system for a switchgear cabinet according to claim 1, characterized in that: The right end of the heat conducting pipe (63) is limited to abut against the sealing gasket (68), the fixed ring (65) is fixedly installed on the left side of the inner wall of the sealing cylinder (61), and the heat conducting pipe (63) is in interference fit on the inner ring face of the fixed ring (65).

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