JP2021014955A - Heating device and heating method using superheated steam generation - Google Patents

Abstract

To provide a heating device capable of realizing the space saving and energy saving of a device, and uniformly heating the entire work.SOLUTION: A heating device M includes a sealed container 1 configured to store work W, a droplet injection pipe 16 capable of supplying water into the sealed container 1 from the outside, a heating area 10 that is provided in the sealed container 1, heats the work W, and generates superheated steam from the water led to the sealed container 1 through the droplet injection pipe 16, an electric heater 11 that is provided in the heating area 10, and heats atmosphere in the heating area 10, and a circulation mechanism 14 that circulates the superheated steam in the sealed container 1.SELECTED DRAWING: Figure 1

Description

The present invention relates to a heating device and a heating method for heating a work using superheated steam.

When heating a work such as carbon fiber reinforced resin (CFRP), a heating device using superheated steam is used. For example, in the heating device described in Patent Document 1, superheated steam generated outside is supplied into a closed container containing a work, and while being heated by an electric heater, it is sprayed toward the work and directly by an electric heater. The work is heated. As a result, the heating time can be shortened. Further, since the superheated steam is circulated in the closed container by the circulation mechanism provided in the closed container and reused by reheating, it has high energy saving property.

International Publication No. 2019/059159

However, in the heating device as described above, additional equipment such as a boiler and a heater for generating superheated steam is required, and it is necessary to devote a lot of space for the installation of such equipment. Further, after the superheated steam is supplied to the device, it is highly energy-saving because it is reused by circulation, but since a large amount of energy is required for the operation of the equipment for generating the superheated steam, higher energy-saving performance is desired. It was. Furthermore, since superheated steam is blown to the work using the momentum given by the circulation mechanism, the wind speed depends on the position of a plurality of blowing nozzles provided due to obstacles such as the rotating airflow of the circulation mechanism and the inner wall of the furnace. However, since temperature unevenness occurs, there has been a demand for a heating device that can more uniformly blow superheated steam toward the work.

Therefore, an object of the present invention is to provide a heating device and a heating method capable of uniformly heating the entire work while realizing space saving and energy saving of the device.

In order to achieve the above object, the invention according to claim 1 includes a closed container configured to accommodate a heated object, a drop injection tube capable of dropping water into the closed container from the outside, and a drop tube. A heating region provided in a closed container to heat an object to be heated and generate superheated steam from water guided into the closed container through a drip injection tube, and a heating region provided in the heating region to create an atmosphere in the heating region. It is characterized by including an electric heater for heating and a circulation mechanism for circulating superheated steam in a closed container.
The invention according to claim 2 is characterized in that, in the configuration of claim 1, the tip of the water outlet side of the drop injection tube is located on the upstream side of the circulation mechanism in the heating region.
In the invention according to claim 3, in the configuration of claim 1 or 2, a partition plate for partitioning a heating region and a duct through which superheated steam moves is provided inside the closed container, and the duct is a closed container. The opening is provided with an opening that opens toward the object to be heated contained therein, and the opening is provided with a plurality of nozzles capable of blowing superheated steam toward the object to be heated.
The invention according to claim 4 is characterized in that, in the configuration of claim 3, an airflow rectifying member is provided in the opening.
The invention according to claim 5 is capable of accommodating an object to be heated, and drops water from the outside to a closed container provided with an electric heater inside, and heats the container with an electric heater to generate superheated steam to overheat. It is characterized in that water vapor is circulated in a closed container to heat an object to be heated.

According to the inventions of claims 1 and 5, superheated steam used for heating the work can be generated from water in a closed container, so that equipment for generating superheated steam such as a boiler or a heater is required. This eliminates the need for space saving and energy saving of the heating device. In addition, since the number of pipes connecting the heating device and equipment such as a boiler is reduced, the ease of maintenance is improved.
According to the invention of claim 2, in addition to the effect of claim 1, superheated steam generated in the heating region is immediately sucked into the circulation mechanism and circulates in the closed container, so that the temperature and superheat in the closed container are generated. It is possible to stabilize the water vapor atmosphere.
According to the invention of claim 3, in addition to the effect of claim 1 or 2, superheated steam can be directly blown onto the work, so that the temperature of the work can be raised more efficiently in a shorter time.
According to the invention of claim 4, in addition to the effect of claim 3, the entire work can be uniformly heated without making the blowout portion (opening) complicated, and the temperature unevenness is further reduced. it can.

It is explanatory drawing which shows the heating apparatus. It is an enlarged explanatory view of the part surrounded by the circle frame A of FIG. (A) is an explanatory diagram showing a modified example 1 of the dropping dish, and (B) is an explanatory diagram showing a modified example 2 of the dropping dish. (A) is an explanatory diagram showing a modified example 3 of the dropping dish, and (B) is an explanatory diagram showing a modified example of the dropping tube.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is an explanatory view showing a heating device.
As shown in FIG. 1, the closed container 1 constituting the heating device M is formed as a substantially box body provided with an insertion port 1a in the front, and the insertion port 1a is closed and sealed in front of the closed container 1. A door 2 that can move up and down is attached between the closed position that closes the container 1 and the open position that allows the opening of the insertion port 1a.
The support rail 3 extends from the insertion port 1a toward the inside of the closed container 1, and the object to be heated (hereinafter referred to as the work W) placed on the loading tray 4 is inserted to a predetermined position by the guidance of the support rail 3. It is possible.
Inside the closed container 1, a duct 5 composed of an outer plate 5a and a partition plate 6 is installed. Further, the duct 5 is provided with openings 7 that open up and down toward the upper surface and the lower surface of the inserted work W, and each of the openings 7 and 7 is provided with a plurality of nozzles 8 and each opening. Inside the 7 and 7, a mesh-shaped airflow rectifying member 9 is provided. The heating region 10 is a region consisting of a space 10a into which the work W is inserted and a space 10b surrounded by the partition plate 6 behind the space 10a.
A plurality of electric heaters 11 are installed in the space 10b behind the inserted work W, and a circulation mechanism 14 including a suction port 12 and an axial fan 13 is provided behind the space 10b. .. The axial fan 13 is driven by a motor 15 installed outside the closed container 1.

A drop injection tube 16 extending from the outside of the closed container 1 toward the inside of the space 10b is provided above the closed container 1, and the tip of the drop injection tube 16 is located near the front side of the suction port 12 (circulation mechanism 14) in the space 10b. It extends to the upstream side of). Further, as shown in FIG. 2, a dish-shaped dropping dish 17 having an upward opening is provided below the dropping tube 16. The drip injection pipe 16 can drip and supply a certain amount of water to the space 10b via a metering pump 18 installed outside the closed container 1.

Next, the heat treatment of the work W using the heating device M will be described.
First, the door 2 is moved to the closed position, the electric heater 11 and the axial flow fan 13 are operated in a state where the closed container 1 is in a closed state, and the atmosphere inside the closed container 1 becomes the temperature of the desired superheated steam. Raise the temperature until it reaches the same temperature. After raising the temperature inside the closed container 1, the metering pump 18 is operated to supply water to the heating region 10 via the drop injection tube 16.
The water supplied to the heating region 10 is heated by coming into contact with the atmosphere in the heated closed container 1 on the dropping dish 17, evaporates to steam, and then further heated. Superheated steam at the desired temperature is produced. The generated superheated steam is sucked from the suction port 12 by the axial fan 13, moves in the duct 5, and is blown out from the upper and lower nozzles 8 toward the space 10a. The superheated steam blown out into the space 10a circulates in the closed container 1 again by the circulation mechanism 14 through the space 10b. In this way, superheated steam is generated in the closed container 1 without providing equipment for generating superheated steam such as a boiler outside the heating device M, and the generated superheated steam is circulated in the closed container 1. , The equipment for generating superheated steam is not required as in the conventional case, and the space saving and energy saving of the heating device M can be realized. Further, since the equipment is no longer required, the maintenance targets are only the heating device M and the metering pump 18, so that the ease of maintenance is improved.
A thermometer and an oxygen concentration meter (not shown) are provided at predetermined positions in the closed container 1, and the conditions inside the closed container 1 such as the temperature inside the container and the amount of superheated water vapor can be checked at any time by controlling the temperature and the oxygen concentration. It is possible to grasp.

After the inside of the closed container 1 reaches the desired temperature and the amount of superheated water vapor, the door 2 is moved to the open position to open the insertion port 1a, and the loading tray 4 on which the work W is placed is guided to the support rail 3. And insert up to space 10a. After that, the door 2 is moved to the closed position to close the insertion port 1a, and the temperature and the amount of superheated steam in the closed container 1 are set again, so that the work W is affected by the superheated steam sprayed and the atmosphere in the closed container 1. Is heated.
At this time, the superheated steam blown from the plurality of nozzles 8 toward the work W through the duct 5 is rectified by passing through the airflow rectifying member 9, and is rectified to the work W at the same flow velocity in any of the nozzles 8. Since the spray can be directed toward the work W, the entire work W can be heated uniformly.

The heating device M of the above embodiment is provided in the closed container 1 configured to accommodate the work W, the drip injection pipe 16 capable of supplying water into the closed container 1 from the outside, and the closed container 1. Electricity that heats the work W and heats the atmosphere in the heating region 10 and the heating region 10 that generates superheated steam from the water guided into the closed container 1 through the drip injection pipe 16. A heater 11 and a circulation mechanism 14 for circulating superheated steam in the closed container 1 are provided.
According to the heating device M having such a configuration, superheated steam used for heating the work W can be generated from water in the closed container 1, so that equipment for generating superheated steam such as a boiler and a heater can be provided. It is no longer necessary, and it is possible to save space and energy in the heating device M. Further, since the number of pipes connecting the heating device M and the equipment such as the boiler is reduced, the ease of maintenance is improved.

Further, the tip of the water outlet side of the drop injection pipe 16 is located on the upstream side of the circulation mechanism 14 in the heating region 10.
Therefore, the superheated steam generated in the heating region 10 is immediately sucked into the circulation mechanism 14 and circulates in the closed container 1, so that the temperature in the closed container 1 and the superheated steam atmosphere are stabilized.

Further, inside the closed container 1, a partition plate 6 for partitioning the heating region 10 and the duct 5 to which the superheated steam moves is provided, and the duct 5 faces the work W housed in the closed container 1. The opening 7 is provided with an opening 7, and the opening 7 is provided with a plurality of nozzles 8 capable of blowing superheated steam toward the work W.
Therefore, since the superheated steam can be directly blown to the work W, the temperature of the work W can be raised more efficiently in a shorter time.

Further, the opening 7 is provided with an airflow rectifying member 9.
Therefore, the entire work W can be uniformly heated without having the opening 7 having a complicated structure, and the temperature unevenness can be further reduced.

FIG. 3A is a modification 1 of the dropping dish.
As shown in FIG. 3A, the dropping dish 17a is formed in a conical shape in which the lower end peripheral edge thereof is folded upward. By forming the dropping dish 17a into a conical shape in this way, the surface area of the dropping dish 17a is increased, and the evaporation of the water supplied into the heating region 10 by the dropping tube 16 is promoted, which is more efficient. Can generate superheated steam.

FIG. 3B is a modification 2 of the dropping dish.
As shown in FIG. 3B, the dropping dish 17b is formed in a fan shape in which a plurality of fins 20 are provided on a rotating shaft 19 extending in the front-rear or left-right direction. The dropping plate 17b may be rotated by utilizing the drop of water on the fin 20 like a water wheel, or may be rotated by a drive mechanism provided separately. By forming the dropping dish 17b into a fan shape in this way, the water supplied into the heating region 10 by the dropping tube 16 is subdivided by the rotating fins 20, and the evaporation of water is promoted, which is more efficient. Can generate superheated steam.

FIG. 4A is a modification 3 of the dropping dish.
As shown in FIG. 4 (A), the dropping dish 17c is made of a spirally formed plate member. By forming the dropping dish 17c in a spiral shape in this way, the water supplied into the heating region 10 by the dropping tube 16 flows on the dropping dish 17c, the water thickness becomes thin, and the evaporation of water is promoted. Therefore, superheated steam can be generated more efficiently.

FIG. 4B is a modified example of the drop injection tube.
As shown in FIG. 4 (B), the tip of the drop injection tube 16a is formed by an assembly of a plurality of thinner branch tubes 21. By forming a plurality of branch pipes 21 at the tip of the dropping pipe 16a in this way, when the water supplied into the heating region 10 falls on the dropping tray 17, the water droplets are subdivided by the branch pipe 21 and the water is separated. Since evaporation is promoted, superheated steam can be generated more efficiently.

The above is a description of the present invention based on the illustrated examples, and the technical scope thereof is not limited to this. For example, the drip infusion tube may extend from a wall other than the upper wall of the closed container to the heating region. Further, the tip of the dropping tube and the dropping dish may have any shape as long as the water supplied into the closed container can be evaporated, and the dropping dish may be omitted. Further, the tip of the drop injection tube can be installed at any position as long as it is near the heating region side of the circulation mechanism. Further, as long as the temperature inside the closed container can be raised to a desired temperature, the number and positions of electric heaters installed are not limited. For example, not only the atmosphere inside the closed container but also the work is installed at a position where it can be directly heated. Etc. Further, the fan used in the circulation mechanism may be a fan other than the axial fan, such as a centrifugal fan, as long as it can circulate superheated steam. Further, the airflow rectifying member only needs to be able to rectify the airflow, and its material, size, thickness, hole diameter, spatial ratio, and the like can be arbitrarily selected. Further, the temperature of the water supplied into the closed container can be changed as appropriate, and it may be normal temperature water or hot water.

M ... heating device, W ... work, 1 ... closed container, 5 ... duct, 6 ... partition plate, 7 ... opening, 8 ... nozzle, 9 ... airflow rectifying member, 10 ... heating Area, 11 ... electric heater, 14 ... circulation mechanism, 16 ... drip tube, 17 ... drip dish.

Claims (5)

A closed container configured to contain the object to be heated,
A drop injection tube that allows water to be dropped and supplied into the closed container from the outside,
A heating region provided in the closed container to heat the object to be heated and generate superheated steam from the water guided into the closed container through the drop injection tube.
An electric heater provided in the heating region and heating the atmosphere in the heating region,
A heating device including a circulation mechanism for circulating the superheated steam in the closed container. The heating device according to claim 1, wherein the tip of the water outlet side of the drop injection tube is located on the upstream side of the circulation mechanism in the heating region. Inside the closed container, a partition plate for partitioning the heating region and the duct through which the superheated steam moves is provided.
The duct comprises an opening that opens toward the object to be heated housed in the closed container.
The heating device according to claim 1 or 2, wherein the opening includes a plurality of nozzles capable of blowing the superheated steam toward the object to be heated. The heating device according to claim 3, wherein the opening is provided with an airflow rectifying member. Water is dripping from the outside into a closed container that can accommodate the object to be heated and has an electric heater inside, and is heated by the electric heater to generate superheated steam, and the superheated steam is generated in the closed container. A heating method characterized in that the object to be heated is heated by circulating it.

Images