Gas heaters for livestock farming

Abstract

To a gas heater for livestock raising capable of reducing workload of installation and removal.SOLUTION: A gas heater for livestock raising includes a gas burner, a heat radiator, and a reflector umbrella. The heat radiator is disposed above the gas burner and radiates heat rays when being heated by combustion flame of the gas burner. The reflector umbrella is disposed above the heat radiator and the gas burner to cover the heat radiator and the gas burner and reflects the heat rays radiated from the heat radiator. The reflector umbrella includes a plurality of openable / closable long ribs and a noncombustible sheet stretched across the plurality of long ribs. The reflector umbrella further includes a first runner, a plurality of stretchers, a second runner, and a central post. The first runner bundles the base ends of the plurality of stretchers so that the plurality of ribs can be opened and closed. The tips of the plurality of stretchers are respectively rotationally connected to intermediate portions of the plurality of long ribs. The second runner bundles the base ends of the plurality of stretchers so that the plurality of stretchers can be opened and closed, and slides along the central post.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a gas heater for livestock farming. [Background Art]

[0002] Conventionally, gas heaters have been used for heating in livestock farming (see Patent Document 1 and Non-Patent Document 1). FIG. 1 is a partial cross-sectional front view showing the configuration of a gas heater for livestock farming disclosed in Non-Patent Document 1. The conventional gas heater for livestock farming 100 illustrated in FIG. 1 is in the form of a hanging gas lamp, and has a structure in which a heat radiator made of ceramic plate is heated from below by the flame of a gas burner 1, and heat rays, i.e., infrared rays, radiated from the heat radiator are reflected downward by a reflector (canopy) 5 made of aluminized steel plate. The reflector 5 has a diameter exceeding 1 m and a weight reaching about 7 kg. The basic configuration of the gas heater for livestock farming disclosed in Patent Document 1 is also the same as that shown in FIG. 1.

[0003] The gas heater for livestock farming 100 has a problem that installation and removal are not easy because the reflector 5 is large in size and weight. In particular, when the gas heater for livestock farming 100 is used for poultry farming, the ceiling of a chicken house is set low to improve the efficiency of heating and other operations. Moreover, chicks grow into young chickens and are shipped in about two months, so it is necessary to remove the gas heater for livestock farming 100 suspended from the ceiling and resuspend it every time a small bulldozer enters for manure treatment about once every two months. Lifting and lowering the gas heater for livestock farming 100, which is a heavy object and many of which are installed in a chicken house, places a great work burden on poultry farmers. If the reflector 5 is made of aluminum, the weight can be reduced to a certain extent, but this causes another problem of increased cost. [Prior Art Documents] [Patent Documents]

[0004] [Patent Document 1] Japanese Unexamined Patent Application Publication No. 2004-215535 [Non-Patent Documents]

[0005] [Non-Patent Document 1] Osaka TYS Co., Ltd.'s webpage, "Easy one-push cleaning of the pilot light nozzle" (https: / / ishii-osakatys.com / ) [Overview of the project] [Problems that the invention aims to solve]

[0006] This invention has been made in view of the above-mentioned problems, and aims to provide a gas heater for livestock that reduces the burden of installation and removal work. [Means for solving the problem]

[0007] To achieve the above objective, a first aspect of the present invention is a gas heater for livestock, comprising a gas burner, a heat radiator, and a reflector umbrella. The heat radiator is positioned above the gas burner and emits heat rays when heated by the combustion flame of the gas burner. The reflector umbrella is positioned above the heat radiator and the gas burner so as to cover them and reflects the heat rays emitted by the heat radiator. The reflector umbrella also has a plurality of ribs that are rotatable and radially arranged at their base ends so as to be openable and closable, and a non-combustible sheet stretched over the plurality of ribs.

[0008] This configuration uses a non-combustible sheet as the reflective material that reflects heat rays, eliminating the risk of combustion, making it lightweight, and reducing manufacturing costs compared to using an aluminum reflective umbrella. Furthermore, since multiple ribs of the reflective umbrella covered with the non-combustible sheet can be opened and closed, the entire reflective umbrella, including the non-combustible sheet, can be opened and closed. Therefore, when installing and removing a livestock gas heater using this configuration, the reflective umbrella can be closed. In this way, the weight is reduced, and the horizontal spread during installation and removal can be made smaller than when in use, thus reducing the workload of installation and removal.

[0009] A second aspect of the present invention is a livestock gas heater according to the first aspect, wherein the reflector umbrella further comprises a first ferrule, a plurality of ribs, a second ferrule, and a central rod. The first ferrule rotatably bundles the base ends of the plurality of main ribs so that the plurality of main ribs can be opened and closed. The plurality of ribs are each rotatably connected to the middle part of the plurality of main ribs. The second ferrule rotatably bundles the base ends of the plurality of ribs so that the plurality of ribs can be opened and closed. The central rod supports the gas burner and the heat radiator with its lower end, and guides the upper ferrule of the first and second ferrules to slide along itself as the main ribs open and close.

[0010] With this configuration, the reflective umbrella opens and closes as the upper runner slides along the central rod, thus shortening the distance between the open reflective umbrella and the heat radiator positioned below it, thereby enhancing the heating effect. Furthermore, since the reflective umbrella can be opened and closed by operating the upper runner, the operation is easy.

[0011] A third aspect of the present invention is a gas heater for livestock according to the second aspect, wherein the reflector umbrella further has a locking mechanism installed on the central pole. The locking mechanism does not obstruct the downward sliding movement of the upper runner to open the main ribs, and locks the upper runner from moving backward upward to maintain the main ribs in an open state, and the locking state can be released by manual operation.

[0012] This configuration further improves the ease of opening and closing the reflective umbrella. The "rebound" mechanism, widely used in rain umbrellas and the like, is an example of a locking mechanism.

[0013] A fourth aspect of the present invention is a gas heater for livestock according to the second or third aspect, wherein each of the plurality of main ribs has a plurality of unit main ribs connected in series and rotatably so as to be able to be folded into multiple sections, thereby enabling the reflector umbrella to be folded into multiple sections when closed.

[0014] With this configuration, the reflective umbrella can be folded when closed, thus maintaining the surface area of ​​the reflective umbrella when open, while minimizing the range of motion of the upper runner when opening and closing the reflective umbrella. This allows for a lower overall height for the livestock gas heater.

[0015] A fifth aspect of the present invention is a gas heater for livestock according to any of the second to fourth aspects, further comprising a controller, a support member, and a suspension device. The controller controls the gas flow rate of the gas burner. The support member supports the upper end of the central rod and the controller so as not to interfere with the opening and closing reflector umbrella. The suspension device is installed on the support member.

[0016] This configuration allows the livestock gas heater to be suspended and used. Furthermore, when suspended, the controller, which has a considerable weight, is supported without placing a load on the conduit that supplies gas from the controller to the gas burner.

[0017] A sixth aspect of the present invention is a gas heater for livestock according to any of the first to fifth aspects, wherein the non-combustible sheet has a plurality of metal eyelets through which the tips of the plurality of main ribs pass. Furthermore, the tips of the plurality of main ribs have crimped portions, thereby preventing the plurality of eyelets from moving toward the base ends of the plurality of main ribs.

[0018] With this configuration, the non-combustible sheet is attached to multiple ribs using non-combustible metal eyelets, thus simplifying the manufacturing process of attaching the non-combustible sheet to multiple ribs.

[0019] A seventh aspect of the present invention is a gas heater for livestock according to any of the first to sixth aspects, wherein the non-combustible sheet has a plurality of substantially triangular non-combustible sheet pieces arranged in the circumferential direction and sewn together with non-combustible fibers.

[0020] According to this configuration, a non-combustible sheet having a relatively large area can be obtained by using non-combustible sheet pieces which have a relatively small area and are relatively easily available. In addition, it is easy to form the non-combustible sheet into a curved surface shape when opened. [Effects of the Invention]

[0021] As described above, according to the present invention, a gas heater for livestock farming that reduces the work burden of installation and removal is achieved. [Brief Description of the Drawings]

[0022] [Figure 1] It is a partial cross-sectional front view illustrating the configuration of a conventional gas heater for livestock farming. [Figure 2] It is a partial cross-sectional front view illustrating the configuration of a gas heater for livestock farming according to an embodiment of the present invention. [Figure 3] It is a partially enlarged view illustrating, in an enlarged manner, the configuration of a part of the gas heater for livestock farming shown in Fig. 2 when a reflector is opened. [Figure 4] It is a partial cross-sectional front view illustrating the configuration of the gas heater for livestock farming shown in Fig. 2 when an openable / closable reflector is closed. [Figure 5] It is a partially enlarged view illustrating, in an enlarged manner, the configuration of a part of the gas heater for livestock farming shown in Fig. 2 when the reflector is closed. [Figure 6] It is a partially enlarged view illustrating, in an enlarged manner, a connection portion between a non-combustible sheet and a main rib of the gas heater for livestock farming shown in Fig. 2, wherein (a) is a cross-sectional view and (b) is a plan view. [Figure 7] It is a plan view illustrating the configuration of the non-combustible sheet of the gas heater for livestock farming shown in Fig. 2. [Figure 8] It is a partially enlarged view illustrating, in an enlarged manner, the configuration of a part of a gas heater for livestock farming according to another embodiment of the present invention when a reflector is opened. [Figure 9] It is a partially enlarged view illustrating, in an enlarged manner, the configuration of a part of the gas heater for livestock farming shown in Fig. 8 when the reflector is closed. [Figure 10]Figure 8 is a magnified cross-sectional view illustrating a portion of a gas heater used for livestock farming, showing an enlarged view of its components. [Modes for carrying out the invention]

[0023] Figure 2 is a partial cross-sectional front view illustrating the configuration of a gas heater for livestock according to one embodiment of the present invention. This gas heater 101 for livestock is a suspended gas heater, similar to the conventional gas heater 100 for livestock (see Figure 1), and has a gas burner 1 and a heat radiator 3, and further has a reflector umbrella 7 instead of a reflector umbrella 5. The heat radiator 3 is positioned above the gas burner 1 and is heated by the combustion flame of the gas burner 1, thereby emitting heat rays, i.e., infrared rays. As an example, the reflector umbrella 7 is made of ceramic tile. The reflector umbrella 7 is positioned above the heat radiator 3 and the gas burner 1 so as to cover them, and reflects the heat rays emitted by the heat radiator 3. In other words, the gas heater 101 for livestock, similar to the gas heater 100 for livestock, has a structure in which the heat radiator 3 is heated from below by the flame of the gas burner 1, and the heat rays emitted by the heat radiator 3 are reflected downward by the reflector umbrella 7.

[0024] Unlike the reflective umbrella 5 of the livestock gas heater 100, the reflective umbrella 7 has multiple ribs 9 arranged radially, similar to the ribs of an umbrella, and rotatably positioned at their base ends, allowing it to be opened and closed, as well as a non-combustible sheet 11 stretched over these ribs 9. The mechanism for opening and closing the ribs 9 will be described in detail later. The ribs 9 are made of stainless steel, for example. The non-combustible sheet 11 is, for example, a multi-layered sheet with aluminum foil on both sides of a glass cloth, and has excellent heat resistance, non-combustibility, and heat shielding properties. Furthermore, unlike the reflective umbrella 5 made of aluminum-plated steel sheet used in conventional livestock gas heaters 100, the non-combustible sheet 11 is flexible enough to be folded and lightweight. Therefore, the reflective umbrella 7, including the non-combustible sheet 11, can be opened and closed just like an umbrella, and is significantly lighter than the reflective umbrella 5. Furthermore, the reflective umbrella 7 has lower manufacturing costs compared to the reflective umbrella 5, which was temporarily replaced from aluminum-plated steel sheet to aluminum sheet. Since the reflective umbrella 7 can be opened and closed, it can be closed when installing and removing the livestock gas heater 101. In this way, the livestock gas heater 101 is lighter in weight, and when installing and removing it, the horizontal spread can be reduced compared to when it is in use, thus reducing the burden of installation and removal work.

[0025] In the illustrated example, the gas burner 1 is fixed to a disc-shaped burner support plate 13. A pilot light nozzle 15 is further fixed to the burner support plate 13 adjacent to the gas burner 1. Gas is supplied from the outside through a flexible gas hose (not shown) that is detachably connected to the gas inlet pipe 17. The supplied gas is sent to the controller 19 via the gas inlet pipe 17. The flow rate of the supplied gas is controlled by the controller 19 and sent to the gas burner 1 and pilot light nozzle 15 through conduits 21 and 23. When the livestock gas heater 101 is in use, the pilot light is constantly maintained by the gas sprayed from the pilot light nozzle 15. This allows for a gradual decrease in temperature even when the flame of the gas burner 1 is extinguished by the control of the controller 19 to regulate the indoor temperature of a chicken coop or the like.

[0026] In the illustrated example, the thermal radiator 3 is bowl-shaped with a curved central section that bulges downwards, and is supported by an annular thermal radiator support plate 25. The edges of the thermal radiator 3 are placed on the thermal radiator support plate 25 such that the curved central section protrudes downwards through the central cavity of the annular thermal radiator support plate 25. In this way, the thermal radiator 3 is detachably and stably supported on the thermal radiator support plate 25. The burner support plate 13 and the thermal radiator support plate 25 are connected to each other by a plurality (three in the illustrated example) of plate-shaped connecting pieces 27.

[0027] The tip ends of several (three in the illustrated example) other plate-shaped connecting pieces 29 are simultaneously connected to the connection portion between the multiple connecting pieces 27 and the heat radiator support plate 25. The base ends of the multiple connecting pieces 29 overlap each other, and through holes (not shown) are formed at the overlapping positions. The lower end of the central rod 31, which passes through these through holes, is connected to the base ends of the multiple connecting pieces 29. In this way, the heat radiator 3 is supported at the lower end of the central rod 31 through the connecting pieces 29 and the heat radiator support plate 25, and the gas burner 1 is similarly supported at the lower end of the central rod 31 through the connecting pieces 29, connecting pieces 27 and the burner support plate 13.

[0028] The livestock gas heater 101 further includes a support member 33, which allows it to be suspended for use. One end of the support member 33 supports the upper end of the central rod 31, and the other end supports the controller 19 through the gas inlet pipe 17. In the illustrated example, the support member 33 is screwed to the upper end of the central rod 31 and the gas inlet pipe 17 with nuts. The support member 33 is, for example, a long rod-shaped or plate-shaped body. As mentioned above, the reflector umbrella 7 can be opened and closed. The support member 33 has a bent shape so as not to interfere with the opening and closing reflector umbrella 7. In the illustrated example, the controller 19 is positioned in a peripheral area not covered by the open reflector umbrella 7 so as not to be excessively heated by the heat rays reflected by the reflector umbrella 7, and not to block the reflected heat rays. The support member 33 separately supports the heavy controller 19 and the equally heavy gas burner 1 and heat radiator 3, thereby preventing the piping between the controller 19 and the gas burner 1 from being subjected to the load required to support the weight of the controller 19.

[0029] A suspension device 35 is connected to the support member 33. The suspension device 35 is positioned, for example, on a vertical line passing through the center of gravity of the entire livestock gas heater 101 when the central rod 31 is in a vertical position. In this case, when the livestock gas heater 101 is suspended using the suspension device 35, the central rod 31 is in a vertical position, and the heat radiator 3 and the open reflector umbrella 7 are in a horizontal position.

[0030] Figure 3 is a magnified view illustrating the configuration of a part of a livestock gas heater 101 when the reflector umbrella 7 is open. A male screw 37 is formed at the lower end of the central rod 31. The lower end of the central rod 31 is fastened to the connecting piece 29 by a pair of nuts 39, 41 that are screwed onto this male screw 37. The base ends of multiple ribs 9, which are arranged radially around the central rod 31, are rotatably connected to a first ferrule 43. The first ferrule 43 is a bundling member that rotatably bundles the base ends of the multiple ribs 9. The first ferrule 43 is annular, and the lower end of the central rod 31 is inserted through its hollow part (not shown). The first ferrule 43 is fixedly fastened to the lower end of the central rod 31 by a pair of nuts 41, 44 that are screwed onto the male screw 37.

[0031] The tip of a support rib 45 is rotatably connected to the middle of each of the radially arranged main ribs 9. The base ends of the multiple support ribs 45 are rotatably connected to a second ferrule 47 so that the multiple support ribs 45 are arranged radially around the central rod 31. The second ferrule 47 is a bundling member that rotatably bundles the base ends of the multiple support ribs 45. The second ferrule 47 is also annular, and the lower end of the central rod 31 is inserted through its hollow part (not shown). The second ferrule 47 is guided by the central rod 31 and can move along the central rod 31. As the second ferrule 47 moves along the central rod 31, the multiple main ribs 9 open and close due to the action of the multiple support ribs 45. Consequently, the reflective umbrella 7 opens and closes. In the illustrated example, the second ferrule 47 is pressed downward by a nut 49 that screws onto a male screw 37 to keep the reflective umbrella 7 in an unfolded state. A lever 51 for rotating the nut 49 by hand is attached to the nut 49, for example, by welding.

[0032] Of the first and second pottery wheels 45 and 47, the upper pottery wheel, the second pottery wheel 47, slides along the central rod 31, causing the reflector umbrella 7 to open and close. This shortens the distance between the open reflector umbrella 7 and the heat radiator 3 positioned below it, thereby enhancing the heating effect. Furthermore, since the reflector umbrella 7 can be opened and closed by operating the upper pottery wheel (the second pottery wheel 47 in the illustrated example), the operation is easy.

[0033] In the illustrated example, the first ferrule 43, which bundles the base ends of the main ribs 9, is a lower ferrule located relatively below and is fixed to the central shaft 31, while the second ferrule 47, which bundles the base ends of the secondary ribs 45, is a upper ferrule located relatively above and slides relative to the central shaft 31. Alternatively, the reflective umbrella 7 may be configured such that the second ferrule 47 becomes a lower ferrule and is fixed to the central shaft 31, and the first ferrule 43 becomes an upper ferrule and slides relative to the central shaft 31.

[0034] In the illustrated example, each of the multiple radially arranged main ribs 9 has multiple (four in the example of Figure 2) unit main ribs 90 connected in series and rotatably. The tip of each rib 45 is rotatably connected to the middle of the unit main rib 90 closest to the central shaft 31. In other words, the reflective umbrella 7 in the illustrated example is configured to be folded into multiple sections (four sections in the illustrated example) when closed, just like a folding umbrella.

[0035] Figure 4 is a partial cross-sectional front view illustrating the configuration of the livestock gas heater 101 when the reflector umbrella 7 is closed. Figure 5 is a partial enlarged view illustrating a portion of the livestock gas heater 101 when the reflector umbrella 7 is closed. In Figures 4 and 5, the non-combustible sheet 11, which corresponds to the umbrella fabric, is omitted from the illustration for convenience. The central rod 31 has a male screw 37 at its lower end and a male screw 53 at its upper end. One end of the support member 33 is fastened to the upper end of the central rod 31 by a pair of nuts 55 and 57 that are screwed onto the male screw 53. The intermediate portion 59 of the central rod 31, sandwiched between the male screws 37 and 53, does not have a male screw. The outer diameter of the intermediate portion 59 is set to be smaller than the outer diameter of the male screws 37 and 53. Therefore, by rotating the lever 51 in a direction that loosens the nut 49 that was pressing the upper runner, the second runner 47, downward, the screw engagement between the nut 49 and the male screw 37 is released, allowing the nut 49 and the second runner 47 to slide along the intermediate part 59. By lifting the second runner 47 upward and tying the perimeter of the non-combustible sheet 11 (not shown), which corresponds to the umbrella fabric, with a string or the like, it becomes possible to maintain the reflective umbrella 7 in a closed state.

[0036] In the illustrated example, the reflector umbrella 7 is folded into multiple sections (four sections in the illustrated example) like a folding umbrella. In the illustrated example, because the reflector umbrella 7 can be folded into multiple sections, the range of movement of the upper runner (second runner 47 in the illustrated example) when the reflector umbrella 7 is opened and closed can be kept small while maintaining the area of ​​the reflector umbrella 7 when it is open. As a result, the overall height of the livestock gas heater 101 can be reduced.

[0037] Figure 6 is a magnified view illustrating the connection between the non-combustible sheet 11 and the main ribs 9 of a livestock gas heater 101, where (a) is a cross-sectional view and (b) is a plan view. The non-combustible sheet 11 stretched over the main ribs 9 is provided with multiple metal eyelets 61 through which the ends of the multiple main ribs 9 pass. The end of each main rib 9 has a crimped portion 63 formed by crimping. This crimped portion 63 prevents the eyelets 61 from moving toward the base end of the main rib 9. By providing another crimped portion 65 on the main rib 9 closer to the end than the crimped portion 63, it is also possible to prevent the eyelets 61 from moving toward the end of the main rib 9 and falling off the main rib 9. In the livestock gas heater 101, the non-combustible sheet 11 is attached to the main frame 9 using non-combustible metal eyelets 61, thus simplifying the manufacturing process of attaching the non-combustible sheet 11 to the main frame 9.

[0038] Figure 7 is a plan view illustrating the configuration of a non-combustible sheet 11 for a livestock gas heater 101. In the illustrated example, the non-combustible sheet 11 is made by sewing together multiple non-combustible sheet pieces 67 with non-combustible fibers. Each non-combustible sheet piece 67 is approximately isosceles triangular in shape, and the two isosceles are sewn together sequentially along the circumferential direction. In this way, a non-combustible sheet 11 with a relatively large area can be obtained using non-combustible sheet pieces 67 that have a relatively small area and are relatively easy to obtain. Furthermore, by making the two isosceles of each non-combustible sheet piece 67 curves that bulge outward rather than being straight, it is also possible to make the sewn non-combustible sheet 11 curved.

[0039] Figure 8 is a magnified partial view illustrating the configuration of a part of a livestock gas heater according to another embodiment of the present invention when the reflector umbrella 7 is open. In this livestock gas heater 102, in order to maintain the reflector umbrella 7 in an open state by locking the upper runner, the second runner 47, to a predetermined part of the central rod 31, a locking mechanism using a snap 69, which is also used in umbrellas, is provided instead of the nut 49 (see Figure 3) that the livestock gas heater 101 has. The second runner 47 has a cylindrical part 71 that extends upward from the part that supports the base end of the support rib 45. The central rod 31 is provided with a slit (not shown) for exposing a part of the snap 69. The cylindrical part 71 of the second runner 47 is provided with a slit (not shown) for receiving the snap 69 exposed from the central rod 31. The latch 69 prevents the second lathe 47 from sliding backward upward, without hindering its downward movement to open the main ribs 9, and maintaining the main ribs 9 in an open position. The latch 69 that locks the second lathe 47 can be released by pressing it with a finger.

[0040] A separate spring 73 is provided on the central shaft 31 above the spring 69. The spring 73 maintains the reflector umbrella 7 in a closed state by engaging the second ferrule 47 with another predetermined part of the central shaft 31. The central shaft 31 is provided with a slit (not shown) for exposing a part of the spring 73. The slit (not shown) provided in the cylindrical part 71 of the second ferrule 47, which receives the spring 69, also receives the spring 73.

[0041] Figure 9 is a magnified view illustrating the configuration of a part of the livestock gas heater 102 when the reflector umbrella 7 is closed. In Figure 9, for convenience, the non-combustible sheet 11 is omitted from the illustration. The latch 73 does not obstruct the upward sliding movement of the second runner 47 to close the main ribs 9, and locks the second runner 47 from moving backward to maintain the main ribs 9 in a closed position. The latch 73 that locks the second runner 47 can be released by pressing it with a finger.

[0042] Figure 10 is a partially enlarged cross-sectional view illustrating an enlarged section of the configuration of a part of the livestock gas heater 102. Figure 10 illustrates the structure of the springs 69 and 73. The central rod 31 is tubular. In the illustrated example, the springs 69 and 73 are connected to each other in the hollow section 80 of the central rod 31. The connecting section 75 that connects the springs 69 and 73 is a curved beam and is elastically bendable. The central part of the connecting section 75 abuts against the inner wall of the central rod 31. Due to the bending elastic restoring force of the connecting section 75, the springs 69 and 73 are biased outward from the central rod 31. The biased spring 69 abuts against the edge of the slit 79 provided in the central rod 31, thereby preventing it from being excessively exposed to the outside through the slit 79. Similarly, the biased spring 73 is prevented from being excessively exposed to the outside through the slit 81 by contacting the edge of the slit 81 provided in the central rod 31. The spring 69 exposed to the outside through the slit 79, or the spring 73 exposed to the outside through the slit 81, is received by the slit 83 provided in the cylindrical portion 71 of the second potter's wheel 47.

[0043] In the illustrated example, the intermediate portion 77 of the central rod 31, sandwiched between the male threads 37 and 53, does not have a male thread. In this case, in order to facilitate the smooth movement of the second potter's wheel 47 along the central rod 31, the outer diameter of the intermediate portion 77 is set to be the same as or larger than the outer diameter of the male threads 37 and 53. To form the central rod 31 in this way, it is sufficient to simply form the male threads 37 and 53 at both ends of a metal pipe. To prevent the heating element from entering the hollow portion 80 of the central rod 31, the hollow portion 80 may be sealed at the lower end of the central rod 31 by metal welding or the like. In the configuration where the first potter's wheel 43 is the upper wheel instead of the second potter's wheel 47, it is preferable to provide a cylindrical portion 71 on the first potter's wheel 43 instead of the second potter's wheel 47. [Explanation of Symbols]

[0044] 1 Gas burner, 3 Heat radiator, 5,7 Reflective umbrella, 9 Main rib, 11 Non-combustible sheet, 13 Burner support plate, 15 Pilot light nozzle, 17 Gas inlet pipe, 19 Controller, 21,23 Conduit, 25 Heat radiator support plate, 27,29 Connecting piece, 31 Center rod, 33 Support member, 35 Hanging device, 37 Male screw, 39,41 Nut, 43 First ferrule (lower ferrule), 45 Receiving rib, 47 Second ferrule (upper ferrule), 49 Nut, 51 Lever, 90 Unit main rib, 53 Male screw, 55,57 Nut, 59 Intermediate section, 61 Eyelet, 63 Crimped section, 65 Crimped section, 67 Non-combustible sheet piece, 69 Repel, 71 Cylindrical part, 73 Repel, 75 Connecting part, 77 Intermediate part, 79 Slit, 80 Hollow part, 81 Slit, 83 Slit, 100, 101, 102 Gas heater for livestock.

Claims

1. Gas burner and A heat radiator positioned above the gas burner and heated by the combustion flame of the gas burner, which emits heat rays, The system comprises a reflective umbrella positioned above the heat radiator and the gas burner so as to cover them, and which reflects the heat rays emitted by the heat radiator, The aforementioned reflective umbrella is Multiple main ribs are rotatably arranged radially at the base end, allowing them to be opened and closed. A gas heater for livestock, comprising a non-combustible sheet stretched over the aforementioned multiple main ribs.

2. The aforementioned reflective umbrella is A first turntable that rotatably bundles the base ends of the plurality of main ribs so that the plurality of main ribs can be opened and closed, Multiple support bones are connected to the intermediate portion of the aforementioned multiple main bones, each with a tip that can rotate freely. A second turntable that rotatably bundles the base ends of the plurality of support bones so that the plurality of support bones can be opened and closed, The livestock gas heater according to claim 1, further comprising: a central rod that supports the gas burner and the heat radiator at its lower end and, as the main ribs open and close, guides the upper of the two pottery wheels, which is located above the first pottery wheel, to slide along itself.

3. The aforementioned reflective umbrella is The livestock gas heater according to claim 2, further comprising a locking mechanism installed on the central rod, which does not obstruct the downward sliding movement of the upper turntable to open the main ribs, and locks the upper turntable from moving backward upward to maintain the main ribs in an open state, and the locking mechanism can be released by manual operation.

4. The gas heater for livestock according to claim 2 or 3, wherein each of the plurality of main ribs has a plurality of unit main ribs connected in series and rotatably so as to be able to be folded into multiple sections, thereby allowing the reflective umbrella to be folded into multiple sections when closed.

5. A controller for controlling the gas flow rate of the aforementioned gas burner, A support member supports the upper end of the central rod and the controller so as not to interfere with the opening and closing reflector umbrella, The livestock gas heater according to claim 2, further comprising a suspension device installed on the support member.

6. The non-combustible sheet has multiple metal eyelets through which the tips of the multiple main ribs pass, The livestock gas heater according to claim 1, wherein the tips of the plurality of main ribs have crimped portions, thereby preventing the plurality of eyelets from moving toward the base ends of the plurality of main ribs.

7. The gas heater for livestock according to claim 1, wherein the non-combustible sheet has a plurality of substantially triangular non-combustible sheet pieces arranged in the circumferential direction and sewn together with non-combustible fibers.

8. The gas heater for livestock according to Claim 1, wherein the non-combustible sheet is a multilayer sheet in which aluminum foil is arranged on both sides of a glass cloth.

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