Heating device

Abstract

To provide a heating device capable of increasing the kinds of applicable heating object article materials.SOLUTION: A heating device comprises: a blower for taking outside air into a device provided with a furnace body 20 in an enclosure; an upstream side heater 61 heating gas flowing through the inside of the device by the blower; a downstream side heater provided at the more downstream side in a direction where the gas flows than the upstream side heater 61 and heating the gas; a fan 70 stirring the gas heated by the downstream side heater and thereafter made to flow into the furnace body 20; a branch flow passage 23 provided so as to branch from a flow passage for exhausting the gas from the inside of the furnace body 20 to the outside of the device and feeding a part of the gas exhausted from the inside of the furnace body 20 from the upstream side heater 61 into the flow passage reaching the downstream side heater; and a damper 80 switching the opening and the braking of the branch flow passage 23.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a heating device that can be used as a secondary vulcanization furnace or a thermostatic bath. [Background technology]

[0002] In a heating device, a technology is known in which a heated gas is passed through a furnace and a part of the gas used to heat the object is circulated and reused to save energy. However, this type of heating device cannot be used depending on the type of material of the object, and it is necessary to use a heating device that exhausts all of the gas used for heating. Thus, in the past, heating devices of different types were used depending on the type of material of the object. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Publication No. 5-39431 [Patent Document 2] Publication number 6-36430 [Patent Document 3] Publication No. 7-11946 Summary of the Invention [Problem to be solved by the invention]

[0004] An object of the present invention is to provide a heating device that can be used to increase the variety of materials to be heated. [Means for solving the problem]

[0005] The present invention employs the following means to solve the above problems.

[0006] That is, the heating device of the present invention is characterized by comprising a blower for taking in outside air into an apparatus having a furnace body within a housing, an upstream heater for heating the gas flowing inside the apparatus by the blower, a downstream heater arranged downstream of the upstream heater in the direction of gas flow and for heating the gas, a fan for stirring the gas that has flowed into the inside of the furnace body after being heated by the downstream heater, a branch flow path that is branched off from a flow path for exhausting gas from inside the furnace body to the outside of the apparatus, and sends a portion of the gas discharged from inside the furnace body into the flow path from the upstream heater to the downstream heater, and a damper for switching between opening and closing the branch flow path.

[0007] According to the present invention, by opening the branch flow path with the damper, a part of the gas used to heat the object can be reused, and by blocking the branch flow path, all of the gas used to heat the object can be exhausted. This makes it possible to increase the types of materials of the object that can be heated by the heating device of the present invention.

[0008] In addition, a double-tube chimney is provided for exhausting gas from inside the furnace body to the outside of the apparatus, and one of the inner passage of the inner tube in the double-tube chimney and the annular passage between the inner tube and the outer tube is used as a flow path for exhausting gas from inside the furnace body to the outside of the apparatus, and the other is used as a flow path for sending outside air taken in by the blower into the apparatus.

[0009] As a result, the outside air taken in by the blower exchanges heat with the exhaust gas as it is sent into the device. This increases the heating efficiency while reducing the amount of heat that escapes to the outside of the device. can be suppressed.

[0010] Furthermore, it is also preferable to provide an insulating material covering the furnace body, and to provide a flow path so that the outside air taken in by the blower flows through the gap between the portion of the insulating material covering the underside of the furnace body and the casing, the gap between the portion of the insulating material covering both side sides of the furnace body and the casing, and the gap between the portion of the insulating material covering the upper side of the furnace body and the casing, before being sent to the area where the upstream heater is located.

[0011] As a result, the outside air taken in by the blower is heated by the heat escaping from the insulating material to the outside before being sent to the upstream heater. Also, the amount of heat escaping to the outside of the device can be reduced.

[0012] The above configurations may be combined as much as possible. Effect of the Invention

[0013] As described above, according to the present invention, it is possible to increase the types of materials that can be used as objects to be heated. [Brief description of the drawings]

[0014] [Figure 1] FIG. 1 is a diagram showing the internal configuration of a heating device according to an embodiment of the present invention, as viewed from above. [Diagram 2] FIG. 2 is a diagram showing the internal configuration of the heating device according to the embodiment of the present invention as viewed from the side. [Diagram 3] FIG. 3 is a front view of the internal configuration of the heating device according to the embodiment of the present invention. [Figure 4] FIG. 4 is a diagram showing the internal configuration of the heating device according to the embodiment of the present invention as viewed from the side. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] Hereinafter, the embodiment of the present invention will be described in detail with reference to the drawings. However, the dimensions, materials, shapes, relative positions, and the like of the components described in the embodiment are not intended to limit the scope of the present invention unless otherwise specified.

[0016] (Example) A heating device according to an embodiment of the present invention will be described with reference to Figures 1 to 4. The heating device according to this embodiment is suitably used as a vulcanizing furnace for secondary vulcanization of rubber products, and can also be used as a thermostatic bath or drying device.

[0017] 1 to 4 are schematic diagrams showing the internal structure of the heating device according to the present embodiment, with FIG. 1 showing the internal structure of the heating device from above, FIG. 2 and FIG. 4 showing the internal structure of the heating device from the side, and FIG. 3 showing the internal structure of the heating device from the front. In each of the figures, characteristic structures are shown in a simplified manner, and for convenience, the position (distance) of the line of sight in the structures shown may differ. Also, for convenience, depth lines are omitted, and structures shown in other figures are omitted. Note that the thick lines in the figures are used to emphasize the parts that function as partitions as necessary. Also, the arrows F1 to F17 in the figures indicate the direction of gas flow. The heating device according to the present embodiment is configured to be able to switch between two systems: a circulation system in which a part of the gas used to heat the object to be heated is circulated, and a total exhaust system in which all of the gas used to heat the object to be heated is exhausted. FIG. 1 and FIG. 3 show the gas flow in both systems, FIG. 2 shows the gas flow in the circulation system, and FIG. 4 shows the gas flow in the total exhaust system.

[0018] In the following description, the left side in Figs. 1, 2 and 4 and the front side of the paper in Fig. 3 will be referred to as the "front side" of the device, and the right side in Figs. 1, 2 and 4 and the rear side of the paper in Fig. 3 will be referred to as the "rear side" of the device. The top and bottom sides in Fig. 1, the front and back sides in Fig. 2 and Fig. 4, and the left and right sides in Fig. 3 are referred to as the "side sides" or "both side sides" of the device. Furthermore, the front and back sides in Fig. 1, and the top and bottom sides in Figs. 2 to 4 are referred to as the "upper side" and "lower side", respectively.

[0019] <Heating device configuration> The heating device 1 according to the present embodiment includes a housing 10, a furnace body 20 provided in the housing, and a heat insulating material 30 (a member shown by hatching in each drawing) that is disposed in the housing and covers the furnace body 20. The housing 10 according to the present embodiment has an interior that is divided into a front side and a rear side by a partition wall, and the furnace body 20 is provided at the front side of the housing interior. In addition, at the rear side of the housing 10, a blower 40 for taking in outside air into the device and a double-pipe chimney 50 for exhausting the gas used to heat the object to be heated to the outside of the device are provided. In addition, at the rear side of the housing interior, a driving mechanism and a control device (both not shown) for driving various members are provided. Furthermore, at the front side of the housing 10, a door 11 for opening and closing the opening of the housing 10 is provided.

[0020] Inside the furnace body 20, a rotary frame 21 is provided on which an object to be heated is placed. In this embodiment, the rotary frame 21 is provided in two places. The rotary frame 21 is configured to rotate during heating by a drive source and a drive mechanism (not shown). A partition wall (see thick line) is configured on the upper surface side of the furnace body 20 to form a flow path for allowing gas to flow in a desired direction. In this flow path, an upstream heater 61 and a downstream heater 62 arranged downstream of the upstream heater 61 in the direction in which the gas flows are provided. The upstream heater 61 can be suitably a sheathed heater with fins in order to efficiently heat the outside air. On the other hand, the downstream heater 62 is suitably a sheathed heater without fins in order to be easy to clean, since the gas used to heat the object to be heated is reused and tar and precipitates may adhere to the downstream heater 62.

[0021] The furnace body 20 is provided with a fan 70 for agitating the gas that has been heated by the downstream heater 62 and then flowed into the furnace body 20. The fan 70 includes a drive source 71 disposed outside the housing 10, a rotating shaft 72 rotated by the drive source 71, and a fan body 73 fixed to the tip of the rotating shaft 72 and disposed inside the furnace body.

[0022] The heat insulating material 30 is provided so as to cover the upper surface side, the lower surface side, both side surfaces and the rear side of the furnace body 20. The gap between the part of the heat insulating material 30 covering the lower surface side of the furnace body 20 and the housing 10, the gap between the part of the heat insulating material 30 covering both side surfaces of the furnace body 20 and the housing 10, and the gap between the part of the heat insulating material 30 covering the upper surface side of the furnace body 20 and the housing 10 are all used as flow paths.

[0023] The double-tube chimney 50 includes an intake port 51 for taking in outside air, an annular passage 52 between the inner and outer tubes, a passage 53 inside the inner tube, and a collection tray 54 for collecting tar and deposits in the exhaust gas and collecting them during maintenance. It is preferable to provide a filter at the intake port 51 to prevent foreign matter from the outside from entering the device. In this embodiment, the annular passage 52 is used as a flow path for taking in outside air into the device, and the inner passage 53 of the inner tube is used as a flow path for exhausting gas from inside the furnace body 20 to the outside of the device. However, the flow path configuration may be changed so that the annular passage 52 is used as a flow path for exhausting gas from inside the furnace body 20 to the outside of the device, and the inner passage 53 of the inner tube is used as a flow path for taking in outside air into the device.

[0024] In addition, inside the heating device 1, a branch flow path 23 is provided which branches off from a flow path (flow path toward the passage 53) for discharging gas from inside the furnace body 20 to the outside of the device. This branch flow path 23 is formed by a gap between the rear side of the furnace body 20 and the heat insulating material 30, and in the flow path from the upstream heater 61 to the downstream heater 62, the gas discharged from inside the furnace body 20 flows through the branch flow path 23. The heating device 1 is configured to send a part of the branch flow path 23. The heating device 1 is provided with a damper 80 that switches between opening and closing the branch flow path 23. The damper 80 can be configured to be provided, for example, in the branch flow path and to have a shutter made of a stainless steel plate that opens and closes the flow path. In this case, for example, an air cylinder can be provided outside the furnace body 20, and the shutter can be opened and closed by a rod-shaped member that reciprocates by the air cylinder.

[0025] According to the heating device 1 configured as above, the flow of gas can be switched by opening and closing the branch flow path 23 with the damper 80. As a result, the heating device 1 can be used as a circulation type by opening the branch flow path 23, and can be used as a total exhaust type by blocking the branch flow path 23. The way the gas flows in each case will be described below.

[0026] <Circulation method> When the heating device 1 is used as a circulation type heating device, the branch flow path 23 is opened by the damper 80 as described above. By operating the blower 40, outside air is taken in from the intake port 51 into the annular passage 52 between the inner pipe and the outer pipe of the double-pipe chimney 50 (arrow F1), and the taken in outside air (gas) flows through the passage 52 (arrow F2). Then, the gas passes through the opening 12a provided in the partition wall separating the inside of the housing 10 from the front side and the rear side, and flows into the gap between the housing 10 and the part of the insulating material 30 that covers the lower side of the furnace body 20 (arrow F3). Then, the gas flows through the gap between the housing 10 and the part of the insulating material 30 that covers both side sides of the furnace body 20 (arrow F4), and further flows through the gap between the housing 10 and the part of the insulating material 30 that covers the upper side of the furnace body 20 (arrow F5). The gas then passes through an opening 31 provided in the part of the insulation material 30 covering the upper surface of the furnace body 20, is sent to the area where the upstream heater 61 is located, and flows further downstream while being heated by the upstream heater 61 (arrow F6).

[0027] The gas heated by the upstream heater 61 is turned back near the top of the damper 80 (arrow F7), flows through the area where the downstream heater 62 is provided, and is further heated by the downstream heater 62. The gas then flows toward the opening 22 provided at the top of the furnace body 20 (arrow F8), and flows from the opening 22 toward the inside of the furnace body 20 (arrow F9). The gas that has entered the inside of the furnace body 20 heats the heating target placed on the rotating frame 21 while being stirred by the fan 70 (arrow F10). The gas after being used to heat the heating target flows into the gap formed between the insulating material 30 on the lower side of the furnace body 20 (arrow F11). The gas then passes through the opening 32 provided in the part of the insulating material 30 that covers the rear side of the furnace body 20, flows through the passage 53 inside the inner tube of the double-tube chimney 50 (arrow F12), and is discharged to the outside of the heating device 1 (arrow F13). In the case of the circulation system, a part of the fluid flowing from inside the furnace body 20 to the outside of the device flows through the branch flow path 23 (arrow F14). The gas flowing through the branch flow path 23 passes through a portion opened by the damper 80 and is returned to the flow path from the upstream heater 61 to the downstream heater 62 (arrow F15). Thereafter, the gas is mixed with the gas that has been heated by the upstream heater 61 and is further heated by the downstream heater 62.

[0028] As described above, in the case of the circulation system, a part of the gas used to heat the object is heated again and used to heat the object, thereby improving the heating efficiency.

[0029] <Total exhaust system> When the heating device 1 is used as a total exhaust type, the branch flow path 23 is blocked by the damper 80 as described above. The flow of gas from the arrow F1 to the arrow F11 is the same as in the case of the circulation type. In the case of the total exhaust type, since the branch flow path 23 is blocked, Therefore, all of the gas flowing in the direction of arrow F11 flows through passage 53 inside the inner tube of double-tube chimney 50 (arrow F12), and is discharged to the outside of heating device 1 (arrow F13).

[0030] <Advantages of the heating device according to this embodiment> According to the heating device 1 of this embodiment, by opening the branch flow path 23 with the damper 80, a part of the gas used to heat the object to be heated can be reused, and by blocking the branch flow path 23, all of the gas used to heat the object to be heated can be exhausted. That is, the heating device 1 of this embodiment can be used by selecting either the circulation method or the total exhaust method. Therefore, the heating device 1 can be used to increase the types of materials of the object to be heated.

[0031] In this embodiment, the inner passage 53 of the inner pipe of the double-pipe chimney 50 is used as a passage for exhausting gas from inside the furnace body 20 to the outside of the apparatus, and the annular passage 52 is used as a passage for taking in outside air into the apparatus. As a result, the outside air taken in by the blower 40 exchanges heat with the exhausted gas in the process of being sent into the apparatus. This makes it possible to increase the heating efficiency while suppressing the amount of heat escaping to the outside of the apparatus. In addition, the temperature of the exhaust gas drops as it flows through the inner passage 53 of the inner pipe of the double-pipe chimney 50, so that precipitates in the exhaust gas components condense and fall into the collection tray 54.

[0032] Furthermore, in this embodiment, the outside air is configured to pass through the gap between the thermal insulation material 30 and the housing 10 before reaching the area where the upstream heater 61 is arranged. Therefore, the outside air taken in by the blower 40 is heated by heat escaping from the thermal insulation material 30 to the outside before being sent to the upstream heater 61. In addition, the amount of heat escaping to the outside of the device can be suppressed. [Explanation of symbols]

[0033] 1 Heating device 10. Chassis 11 Door 12a opening 20 Furnace body 21 Rotating frame 22 Opening 23 Branch Channel 30 Insulation 31 Opening 32 Opening 40 Blower 50 Double pipe chimney 51 Air Intake 52 Passage 53 Passage 54 Recycled Plate 61 Upstream heater 62 Downstream heater 70 Fans 71 Power Source 72 Rotational Axis 73 Fan body 80 Damper

Claims

1. A blower for taking in outside air into an apparatus having a furnace body in a housing; an upstream heater that heats the gas flowing through the device by the blower; a downstream heater disposed downstream of the upstream heater in a gas flow direction and configured to heat the gas; A fan for stirring the gas that has been heated by the downstream heater and then flowed into the furnace body; a branch flow path that is provided so as to branch off from a flow path for discharging gas from inside the furnace body to the outside of the apparatus, and that sends a part of the gas discharged from inside the furnace body into a flow path from the upstream heater to the downstream heater; A damper for switching between opening and closing the branch flow path; A heating device comprising:

2. A double-pipe chimney is provided for exhausting gas from inside the furnace body to the outside of the apparatus, The heating device described in claim 1, characterized in that one of the inner passage of the inner tube in the double-tube chimney and the annular passage between the inner tube and the outer tube is used as a flow path for exhausting gas from inside the furnace body to the outside of the device, and the other is used as a flow path for sending outside air taken in by the blower into the device.

3. A heat insulating material is provided to cover the furnace body, The heating device described in claim 1 or 2, characterized in that a flow path is provided so that the outside air taken in by the blower flows through the gap between the part of the insulation covering the underside of the furnace body and the housing, the gap between the part of the insulation covering both side sides of the furnace body and the housing, and the gap between the part of the insulation covering the upper side of the furnace body and the housing, and then is sent to the area where the upstream heater is arranged.

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