Automatic fire preventing and extinguishing device for coal mine goaf

Abstract

The utility model relates to an automatic fire preventing and extinguishing device in a coal mine goaf, a jet orifice is provided with a ball valve, a starter consists of a temperature sensing shell and a torsion spring piece, the temperature sensing shell is made of a material which deforms when heated, a groove is arranged in the temperature sensing shell, the torsion spring piece is arranged in the groove in a compression buckling manner, and the peripheral end of the torsion spring piece is fixed with the inner wall of the groove; one end of the linkage assembly is connected with the circle center end of the torsion spring piece through a fixing clamp, and the other end of the linkage assembly is connected with the ball body through an energy storage shaft, so that the torsion spring piece rotates to drive the ball body to rotate. The temperature sensing part accurately senses the peripheral environment temperature, the starting part is more sensitive, the ball valve switch is good in sealing performance, the switch flow resistance is smaller, the coverage range is wider, and the cooling effect in an area is more obvious.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the coal mine goaf residual coal spontaneous combustion fire control technical field, concretely relates to automatic fire extinguishing device of coal mine goaf. BACKGROUND

[0002] The area expansion and residual coal increase of coal mine goaf can easily cause the oxidation and spontaneous combustion of floating coal. In order to prevent the spontaneous combustion of the mine, the current prevention and control measures mainly include injecting inert gas in the closed area, grouting fire extinguishing technology, gel fire extinguishing technology and the like, but there are still limitations in the fire extinguishing timeliness and fire extinguishing range, which need manual operation and threaten the life safety. In view of the problem of the temperature rise and spontaneous combustion of residual coal in the goaf, the Chinese invention patent with the publication number CN202323022254 discloses a coal mine goaf fire extinguishing device, which comprises a spherical tank body and a starter. When installing, the safety catch is removed first. When the temperature of the goaf reaches the critical temperature at which the temperature sensing glass rod breaks, the high temperature and the pre-pressed spring make the temperature sensing glass rod break. The moving block loses the limitation and is ejected downward under the pressure of the pre-pressed spring. The spurs of the moving block pierce the blocking cover, so that the fire extinguishing material in the inner shell is sprayed out under the action of the internal pressure. The disadvantages of this scheme are as follows: 1. the tank body is a multi-layer structure, and the internal low-melting-point alloy material is not sensitive to the external temperature sensing change; 2. the safety catch needs to be removed during installation, and there is a risk of accidental triggering of the device; and 3. the fragments of the broken temperature sensing glass rod are still in the device, which has the risk of failure in the fire extinguishing process.

[0003] The Chinese invention patent with the publication number CN217233577U discloses a spraying mechanism for coal mine fire extinguishing, which comprises a swinging assembly and a spraying assembly. When the first driving part can drive the spraying end of the spraying assembly to move together with the movement group, the arc of the circular track can be more than 90 degrees and move upward to the vertical direction at most, so that the spraying angle can cover the range of the entire circular track, thereby realizing accurate and rapid fire extinguishing. The disadvantages of this scheme are as follows: 1. it needs to be carried close to the ignition point, which leads to a long time consumption and affects the fire extinguishing efficiency; 2. it needs to be manually carried, which has a large safety hazard; and 3. the goaf forms and conditions are different, and the device cannot be transported into some areas, which has a large fire extinguishing limitation. SUMMARY

[0004] The utility model aims at solving the above-mentioned problems, and provides a goaf automatic fire extinguishing device with a safer and more reliable starting mechanism.

[0005] The utility model adopts the technical scheme of:

[0006] The utility model discloses a kind of automatic fire prevention and extinguishing devices of coal mine goaf, including tank, tank is filled with fire extinguishing material, tank is equipped with injection hole, injection hole is connected ball valve above, ball valve is connected release module above, starter is arranged in the side of ball valve, the ball valve, inside is equipped with ball, ball center is equipped with longitudinal through-hole, when the through-hole connects injection hole and release module, the fire extinguishing material in tank can be released outward;The starter is composed of temperature sensing shell and torsion spring piece, temperature sensing shell is made of material that meets heat deformation, recess is equipped in temperature sensing shell, torsion spring piece is compressed and flexed and installed in recess, and its circumferential end is fixed with recess inner wall;Further equipped with linkage assembly, one end is connected with the circumferential end of torsion spring piece through fixed card, the other end is connected with ball through energy storage shaft, so that the rotation of torsion spring piece drives ball to rotate.

[0007] Compared with the prior art, the application has the beneficial effects of:

[0008] The automatic starting tank fire extinguishing material spouts, and the structure is simple and reliable.

[0009] As preferred, the further technical solution of the application is:

[0010] The ball valve includes a valve body, a ball, a valve seat and a valve rod, the ball is installed in the valve cavity of the valve body; the upper part of the valve body is provided with an upper threaded opening connected with the release module; the lower part of the valve body is provided with a lower threaded opening connected with the injection hole; the valve seat is installed on the top of the lower threaded opening, and the upper edge of the valve seat abuts against the outer wall of the ball; the ball is provided with a through-hole in the center; the valve rod penetrates through the side wall of the valve body, and the inner end of the valve rod is fixedly connected with the ball; the height of the valve cavity is equal to the height of the ball, and the width of the valve cavity is greater than the width of the ball.

[0011] The beneficial effects obtained from the above features are that the valve body has good sealing performance, the ball valve has good passing performance, and the fire extinguishing material can be fully and quickly sprayed out.

[0012] The temperature sensing shell and the recess structure inside the temperature sensing shell are both circular, and the inner wall of the recess is uniformly provided with a tooth groove; the torsion spring piece is a disc-shaped elastic metal sheet, and the circumferential end of the torsion spring piece is provided with a bent ring, which is clamped in any tooth groove.

[0013] The beneficial effects obtained from the above features are that the starting structure utilizes the relaxation force of the torsion spring to drive the mechanical structure to release the material, and the temperature sensing accuracy is higher, and the material is not easy to be damaged before use.

[0014] The linkage assembly is composed of a large gear No.1, a large gear No.2, a small gear No.1, a small gear No.2, an energy storage shaft and a fixed clamp; the large gear No.1 meshes with the small gear No.1, the small gear No.1 is coaxially fixed with the large gear No.2, and the large gear No.2 meshes with the small gear No.2; the large gear No.1 is fixedly connected with the fixed clamp at the shaft center, the small gear No.2 is fixedly connected with the energy storage shaft at the shaft center, and the energy storage shaft is connected with the valve rod.

[0015] The beneficial effect obtained by the above features is that the gear amplifies the force released by the torsion spring by four times through twice transmission ratio, so as to drive the energy storage shaft to rotate. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a whole structure schematic view of the automatic fire prevention device of the utility model;

[0017] Figure 2 It is an internal example view of the ball valve of the utility model;

[0018] Figure 3 It is a gear set structure example view of the utility model;

[0019] Figure 4 It is a temperature sensing module schematic view of the utility model;

[0020] Figure 5 It is a thermal insulation material schematic view of the utility model;

[0021] Figure 6 It is a release module schematic view of the utility model;

[0022] Figure 7 It is a layout form of the utility model in the goaf.

[0023] In the drawing: 1, tank body; 2, fire extinguishing material; 3, thermal insulation material; 4, tank body shell; 41, inner shell; 42, outer shell; 5, injection hole; 6, ball valve; 61, valve body; 62, ball; 63, valve rod; 64, valve seat; 7, linkage assembly; 71, large gear No.1; 72, large gear No.2; 73, small gear No.1; 74, small gear No.2; 75, energy storage shaft; 76, fixed clamp; 8, starter; 81, temperature sensing shell; 82, torsion spring piece; 83, arc bend; 84, fold circle; 85, tooth groove; 9, safety catch; 10, release module; 11, handle. DETAILED DESCRIPTION

[0024] The application will be further described in connection with the embodiments, and the purpose is only to better understand the content of the application, therefore, the examples do not limit the protection scope of the application.

[0025] Reference Figures 1-7The utility model provides a kind of automatic fire prevention and extinguishing device of coal mine goaf, including tank body 1, tank body 1 is filled with fire extinguishing material 2, tank body 1 is equipped with injection hole 5, injection hole 5 is installed ball valve 6, ball valve 6 upper portion is connected with release module 10, ball valve 6 is equipped with starter 8, starter 8 is used to make ball valve 6 rotate to make fire extinguishing material 2 spray, release module 10 makes fire extinguishing material 360 degrees spray, to create low temperature low oxygen environment in certain range, prevent residual coal temperature rise and occur spontaneous combustion.

[0026] Referring to Figure 5 As an option, the tank body shell 4 is composed of inner shell 41 and outer shell 42, and composite thermal insulation material 3 is arranged in the interval of the two. Hard thermal insulation silica gel is used as the shell material, which can not only withstand a certain weight and avoid damage to the tank body 1 caused by bumps during transportation, but also reduce heat exchange between the inner shell and the outside. The inner shell is made of composite multi-layer aerogel material, which enables the high-pressure gas tank to have a certain inflation capacity to ensure safety. The pressure in the tank is always controlled within the bearing range of the tank body 1, and the inner shell and the composite thermal insulation material 3 better reduce the exchange of heat between the inside and the outside, maintain low temperature during transportation, and avoid large fluctuations in the pressure in the tank body 1 caused by external temperature.

[0027] The ball valve 6 is internally provided with a ball 62, and a longitudinal through hole is arranged at the center of the ball 62. When the through hole connects the injection hole 5 and the release module 10, the fire extinguishing material 2 in the tank body 1 can be released outward.

[0028] Referring to Figure 2 Specifically, the ball valve 6 includes a valve body 61, a ball 62, a valve seat 64, and a valve rod 63. The ball 62 is arranged in the valve cavity of the valve body 61. An upper threaded opening is arranged at the upper portion of the valve body 61 and connected with the release module 10. A lower threaded opening is arranged at the lower portion of the valve body 61 and connected with the injection hole 5. The valve seat 64 is arranged at the top of the lower threaded opening and abuts against the outer wall of the ball 62. A through hole is arranged at the center of the ball 62. The valve rod 63 penetrates through the side wall of the valve body 61 and is fixedly connected with the ball 62 at the inner end. The ball 62 is driven by the valve rod 63 to rotate the through hole. When the through hole connects the upper threaded opening and the lower threaded opening, the fire extinguishing material 2 is sprayed out.

[0029] The height of the valve cavity is equal to the height of the ball 62, and the width of the valve cavity is greater than the width of the ball 62. The valve rod 63 has a spiral groove, which cooperates with the guide pin of the valve rod 63 to control the left-right movement and up-down rotation of the ball 62, but cannot move up and down. The valve seat 64 is arranged at the passage of the valve body 61 and plays a sealing role. The ball 62 is tightly pressed on the valve seat 64 under the mechanical pressure of the valve rod 63. When the energy storage shaft 75 rotates, the guide pin in the spiral groove of the valve rod 63 makes the ball 62 move to the right and rotate, and the fire extinguishing material 2 flows through the middle. The side wall of the valve body 61 cooperates with the valve seat 64 to play a sealing role, preventing the fire extinguishing material 2 from leaking.

[0030] The starter 8 is composed of a temperature sensing shell 81 and a torsion spring sheet 82, the temperature sensing shell 81 is made of a material that deforms when heated, the temperature sensing shell 81 is provided with a groove, the torsion spring sheet 82 is compressed and bent and installed in the groove, and the circumferential end thereof is fixed to the inner wall of the groove.

[0031] Specifically, referring to Figure 4 , the fixing mode of the torsion spring sheet 82 and the temperature sensing shell 81 is that the inner wall of the groove is uniformly provided with a tooth groove 85, and the circumferential end of the torsion spring sheet 82 is provided with a folded ring 84, which is clamped in any one of the tooth grooves 85.

[0032] The torsion spring sheet 82 in the scheme is a disc-shaped elastic metal sheet, and specifically can be made of alloy spring steel or carbon spring steel. The temperature sensing shell 81 and the groove structure inside it are circular, and the deformation thereof at high temperature can be softening or expansion. For example, when PA6 material is used, it will soften at an environment of 60-70℃, and after softening, the tooth groove 85 cannot constrain the folded ring 84, so that the spring rotates and relaxes as a whole; for example, when metal material is used, it expands at high temperature, the diameter of the groove becomes larger, and the tooth groove 85 cannot constrain the spring. The scheme uses special metal material as a detection structure for controlling the ejection of the starter 8, and the physical performance change of the material is reliable, which ensures that the fire extinguishing device can reliably eject and the starting time is accurate.

[0033] The inner ring of the temperature sensing shell 81 is used to limit the torsion spring sheet 82, and at normal temperature, the torsion spring sheet 82 is installed in the temperature sensing shell 81 in a tightened state. When the temperature sensing shell 81 expands in a high temperature environment, the diameter of the groove becomes larger, and then the torsion spring sheet 82 relaxes and rotates at the center end, thereby controlling the rotation of the ball 62 through the linkage assembly 7.

[0034] The linkage assembly 7 is also provided, one end of which is connected to the center end of the torsion spring sheet 82 through a fixed clamp 76, and the other end is connected to the ball 62 through an energy storage shaft 75, so that the rotation of the torsion spring sheet 82 drives the rotation of the ball 62.

[0035] Specifically, referring to Figure 3 , the linkage assembly 7 is composed of a large gear No. 71, a large gear No. 72, a small gear No. 73, a small gear No. 74, an energy storage shaft 75 and a fixed clamp 76; the large gear No. 71 is engaged with the small gear No. 73, the small gear No. 73 is coaxially fixed with the large gear No. 72, and the large gear No. 72 is engaged with the small gear No. 74; the fixed clamp 76 is fixed to the shaft of the large gear No. 71, the energy storage shaft 75 is fixed to the shaft of the small gear No. 74, and the energy storage shaft 75 is connected to the valve rod 63. The gear amplifies the force released by the torsion spring by four times due to the two times transmission ratio, so as to drive the rotation of the energy storage shaft 75.

[0036] The mounting structure of the center of torsion spring sheet 82: fixed card 76 is composed of a vertical shaft and at least one arc-shaped pipe sheet, the lower end of the vertical shaft is fixed at the center of the large gear No. 71, the arc-shaped pipe sheet is concentric with the vertical shaft and is provided with a gap between the vertical shaft, and the gap forms a fitting port; the center of the torsion spring sheet 82 is provided with an arc-shaped bend 83, which is arc-shaped and clamped in the fitting port. See Figure 3 The arc-shaped pipe sheet is two, which is a quarter of a circle, the arc-shaped pipe sheet is spaced by a quarter of a circle on the side, the center of the torsion spring sheet 82 is provided with a quarter of a circle arc-shaped bend 83, the arc-shaped bend 83 is installed between the arc-shaped pipe sheet and the vertical shaft, and the left end is extended.

[0037] The energy storage shaft 75 is connected with the valve rod 63, the diameter of the energy storage shaft 75 is larger than that of the valve rod 63, the energy storage shaft 75 completely transmits the force to the valve rod 63 of the ball valve 6, there is no loss of force, so that the opening of the ball valve 6 reaches 90°, and the liquid carbon dioxide is completely released.

[0038] Further, the upper part of the tank body 1 is provided with a protective shell outside the ball valve 6, the lower end of the protective shell is welded and fixed with the tank body shell 4, and the protective shell is provided with a handle 11 with low heat conduction efficiency on one side, the handle 11 is inwardly recessed, and the handle 11 is welded between the protective shell to ensure that it will not fall off for convenient carrying.

[0039] The protective shell can form a cavity for the device starter 8 and the transmission assembly, the PA6 temperature sensing shell 81 is fixed in the protective shell and fixed with the inner wall of the protective shell, so that the temperature sensing shell 81 is more stable and can reinforce the torsion spring sheet 82, so that the accumulated force of the torsion spring is used for starting the ball valve 6 switch.

[0040] Further, the starter 8 is also provided with a safety latch 9, specifically, the temperature sensing shell 81 is provided with a pin hole, the safety latch 9 is installed in the pin hole, and the inner end of the safety latch 9 is inserted into the outer wall of the protective shell. Avoiding the spring from being triggered by the ball valve 6 due to the unexpected rotation of the temperature sensing shell 81. More specifically, the safety latch 9 penetrates the folded ring 84 of the torsion spring sheet 82, and the safety latch 9 is used to avoid the accidental start of the starter 8 during transportation or storage.

[0041] The extinguishing material 2 is liquid carbon dioxide, which can evaporate into gas quickly, take away part of the heat of the coal body oxidized and heated, reduce the temperature of the fire source in the region, and increase the carbon dioxide content in the coal, which can resist the oxidation and heating for a longer time.

[0042] Referring to Figure 6 The bottom of the release module 10 is sealingly connected with the surface of the tank body 1, a plurality of through holes are provided on the release module 10, the materials sprayed out of the through holes are uniformly sprayed out to all directions, the spraying direction is more, and the extinguishing material 2 can radiate a larger range.

[0043] Before the fire extinguishing device is buried in the predetermined position of the goaf, the safety catch 9 is removed; when the temperature of the goaf continuously rises to the critical temperature of the deformation of the temperature sensing shell 81, the high temperature causes the temperature sensing shell 81 to deform, the torsion spring sheet 82 loses the restriction of the temperature sensing shell 81 to release the elastic force, the fixed clamps 76 drive the large gear 71 to rotate, the elastic force is amplified four times by the gear set, the energy storage shaft 75 drives the valve rod 63 to rotate, the two carbon dioxide in the tank body 1 loses the restriction of the ball valve 6 to release the pressure, and is sprayed under the action of the pressure.

[0044] The automatic fire extinguishing device needs to be buried in the predetermined position of the goaf, as the temperature of the goaf continuously rises, the PA6 temperature sensing shell 81 in the automatic temperature sensing starting device deforms, the space of the torsion spring becomes larger, the force is released, the gear set is driven to rotate through the connected support rod, the force released by the torsion spring is also increased, the ball valve 6 is driven to rotate through the energy storage shaft 75, the hole in the ball valve 6 is aligned with the injection hole 5, and the liquid carbon dioxide is sprayed under the action of the internal pressure.

[0045] The above only describes the preferred embodiments of the present application, and does not limit the scope of the present application, and any equivalent changes made by applying the content of the specification and the drawings of the present application are included in the scope of the present application.

Claims

1. An automatic fire prevention and extinguishing device for a coal mine goaf, comprising a tank body (1), the tank body (1) being filled with a fire extinguishing material (2), a spray hole (5) being provided on the tank body (1), a ball valve (6) being connected above the spray hole (5), a release module (10) being connected above the ball valve (6), a starter (8) being provided on the side of the ball valve (6), and characterized in that: The ball valve (6) is provided with a ball (62) inside, and a longitudinal through hole is provided at the center of the ball (62). When the through hole is connected to the injection hole (5) and the release module (10), the fire extinguishing material (2) in the tank body (1) can be released outwards; The starter (8) is composed of a temperature-sensing housing (81) and a torsion spring piece (82). The temperature-sensing housing (81) is made of a material that deforms when heated. A groove is provided in the temperature-sensing housing (81). The torsion spring piece (82) is installed in the groove in a compressed and bent manner, and its peripheral end is fixed to the inner wall of the groove. A linkage assembly (7) is also provided, one end of which is connected to the center end of the torsion spring sheet (82) via a fixing clamp (76), and the other end is connected to the sphere (62) via an energy storage shaft (75), so that the rotation of the torsion spring sheet (82) drives the sphere (62) to rotate.

2. The automatic fire prevention and extinguishing device for coal mine goaf according to claim 1 is characterized in that: The ball valve (6) comprises a valve body (61), a sphere (62), a valve seat (64) and a valve stem (63), wherein the sphere (62) is installed in the valve cavity of the valve body (61); an upper threaded opening is provided on the upper portion of the valve body (61) and is connected to the release module (10); a lower threaded opening is provided on the lower portion of the valve body (61) and is connected to the injection hole (5); a valve seat (64) is installed on the top of the lower threaded opening, and the upper edge of the valve seat (64) abuts against the outer wall of the sphere (62); a through hole is provided in the center of the sphere (62); the valve stem (63) passes through the side wall of the valve body (61), and its inner end is fixedly connected to the sphere (62); the height of the valve cavity is equal to the height of the sphere (62), and the width of the valve cavity is greater than the width of the sphere (62).

3. The automatic fire prevention and extinguishing device for coal mine goaf according to claim 1 is characterized in that: The temperature sensing housing (81) and the groove structure inside it are both circular, and the inner wall of the groove is evenly provided with tooth grooves (85); the torsion spring sheet (82) is an elastic metal sheet in the form of a coil, and a folded ring (84) is provided at the peripheral end of the torsion spring sheet (82), and the folded ring (84) is fixed in any one of the tooth grooves (85).

4. The automatic fire prevention and extinguishing device for coal mine goaf according to claim 1 is characterized in that: The linkage assembly (7) is composed of a large gear No. 1 (71), a large gear No. 2 (72), a small gear No. 1 (73), a small gear No. 2 (74), an energy storage shaft (75) and a fixing clamp (76); the large gear No. 1 (71) is meshed with the small gear No. 1 (73), the small gear No. 1 (73) is coaxially fixed with the large gear No. 2 (72), and the large gear No. 2 (72) is meshed with the small gear No. 2 (74); the axis of the large gear No. 1 (71) is fixedly connected to the fixing clamp (76), the axis of the small gear No. 2 (74) is fixedly connected to the energy storage shaft (75), and the energy storage shaft (75) is connected to the valve stem (63).

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