JP2526239B2 - Radiation tube of radiation heater device - Google Patents

Description

TECHNICAL FIELD The present invention relates to a radiant tube of a radiant heater device used for various heating processes, heating, and the like.

(Prior Art and its Problems) As a conventional radiant heater device, for example, as shown in FIG. 4, hot air from a hot air supply source a such as a burner is passed through a radiant tube b to heat the radiant tube b. Some get the desired radiation.

However, conventionally, hot air is simply passed directly through the radiant tube b from the upstream side to the downstream side, so the temperature of the hot air and the surface temperature of the radiant tube b decrease toward the downstream side, and thus the temperature-dependent radiation There is a problem that the control of the wavelength is difficult and the energy efficiency of the radiation tube b is low because the radiation tube b is heated except the portion corresponding to the predetermined radiation direction.

An object of the present invention is to solve the above problems.

(Means for Solving Problems) The structure of the present invention will be described with reference to FIG. 1 to FIG. 3 corresponding to the embodiment. According to the present invention, the inner tube 2 for supplying hot air is provided inside the outer tube 1 for radiation. And a partition plate 6 for partitioning the radiant space 4 corresponding to a desired radiant portion 3 of the outer tube 1 and the hot air blasting space 5 between the outer tube 1 and the inner tube 2 The radiation space 4 and the hot air discharge space 5 are provided on the outer tube 1 side of the plate 3.
A hot-air communication gap 7 between the hot-air outlet and the hot-air outlet 8 is provided in the longitudinal direction on the radiant space 4 side of the inner tube 2.

(Operation) In the above configuration, the hot air supplied to the inner pipe 2 is ejected from the ejection port 8 into the radiation space 4 to heat the radiant portion 3 of the outer pipe 1. Then, the hot air having the lowered temperature is jetted from the gap 7 into the hot air discharge space 5 in the outer tube 1 at a higher flow velocity, and is discharged through the space 5 to the outside air from the discharge portion formed at a proper position.

As described above, according to the present invention, the radiation portion 3 of the outer tube 1 is heated by the hot air ejected from each of the hot air outlets 8 arranged in the length direction of the inner tube 2, so that the inside of the radiation tube is directly heated from the upstream side. Unlike the conventional structure in which the hot air is passed through the downstream side, the surface temperature does not decrease toward the downstream side, and therefore the surface temperature can be made uniform in the length direction.

In addition, the radiation space 4 having the radiation portion 3 has a partition plate 6
Is separated from the hot air discharge space 5, and the hot air supplied to the inner pipe 2 is only in this space 4 the hot air jet 8
After the gas is ejected from the air, and the injection part 3 is heated, the air is ejected from the gap 7 into the hot air discharge space 5 at a high flow rate, so that only the radiation part 3 can be efficiently heated and energy efficiency can be improved. Can be increased.

(Example) Next, an example will be described. FIG. 2 shows an example in which the radiant tube of the present invention is applied to a large radiant heater device.
In this embodiment, the radiation tube is arranged in the body 11 continuously from the hot air supply source 9 side such as a burner to the discharge portion 10 with the radiation portion 3 facing the same plane side, and a large radiation surface is provided. It is what constitutes. In this structure, the inner tube 2 has one end connected to the hot air supply source 9 and the other end closed, and the outer tube 1 closes the end on the hot air supply 9 side and the other end at the other end. Closes the corresponding part of the radiation space 4.

With the above configuration, all the hot air from the hot air supply source 9 is ejected from the hot air outlet 8 into the radiation space 4 through the inner pipe 2, and all the hot air in the radiation space 4 is also emitted from the gap 7. It is possible to make the radiation temperature uniform and save energy with respect to the radiation surface that jets out into the working space 5 and thus spreads over a wide area. In a specific design, the radiant temperature can be easily made uniform by appropriately setting the diameter and the distribution state of the hot air outlets 8 in the length direction. Reference numeral 12 in the drawing is a desired radiant substance formed outside the radiant portion 3 of the outer tube 1, but the radiant substance 12 may be omitted depending on the case.

Specific examples of the radiation surface of a wide area formed by the radiation tube of the present invention include the configuration shown in FIG. 2 and the configuration shown in FIG. 3, for example. That is, in the embodiment of FIG. 3, the hot air supply header connected to the hot air supply source 9 is provided on one side of the container 11.
13, a hot air discharge header 14 connected to the discharge portion 10 is provided on the other side, and the radiation tubes of the present invention are arranged between these headers 13 and 14 with their radiation portions 3 facing in the same plane. .
In such a configuration, the inner tubes 2 of the radiant tubes arranged in a row
Of the outer pipe 1 is connected to the header 13 and the other end is closed, and the outer pipe 1 closes the end on the header 13 side and the corresponding part of the radiation space 4 at the other end, and the hot air discharge space 5
Connect the corresponding part of the to the header 14. Thus, also in such a configuration, it is possible to make the radiation temperature uniform and save energy as in the above-described configuration.

(Effects of the Invention) As described above, the present invention is different from the conventional radiant tube that heats the radiant portion by directly flowing hot air into the tube from the upstream side to the inner tube for supplying hot air into the outer tube having the radiant portion. The hot air jets arranged in the lengthwise direction of the inner tube are configured to heat the radiant portion by the hot air jetted into the outer tube, and the hot air is radiated by a partition plate. Since it is configured to eject only into the space for heating, and then to increase the flow velocity from the gap of the partition plate to eject into the space for releasing hot air, the surface temperature of the radiant portion can be made uniform in the length direction, Therefore, even if a radiation surface having a large area is formed, the temperature distribution can be made uniform, the radiation wavelength depending on the temperature can be easily controlled, and the energy efficiency can be improved.

[Brief description of drawings]

1 to 3 correspond to an embodiment of the present invention. FIG. 1 is a perspective view showing the configuration, and FIG. 2 is a schematic diagram showing the configuration of a radiant heater device constituted by a radiant tube of the present invention. Shows,
(A) is a front view with a part cut away, (b) is X- of (a)
An X-ray enlarged cross-sectional view, FIG. 3 is a partially cutaway front view schematically showing another configuration of the radiation heater device constituted by the radiation tube of the present invention. FIG. 4 is a partially cutaway front view showing an example of a conventional radiant heater device. Reference numeral 1 ... (radiation) outer tube, 2 ... (hot air supply) inner tube, 3 ... radiation part, 4 ... radiation space, 5 ... hot air discharge space, 6 ... partition plate, 7 ... (for hot air communication),
8: hot air jet, 9: hot air supply source, 10: discharge part,
11 …… Vessel, 12 …… Radiant substance, 13 …… (for hot air supply) header, 14 …… (for hot air discharge) header.

Claims (1)

(57) [Claims] 1. An inner pipe for supplying hot air is formed in the outer pipe for radiation, and a partition plate for partitioning a space for radiation and a space for releasing hot air corresponding to a desired radiation portion of the outer pipe is provided inside the outer pipe. It is configured between the pipes, and a hot air communication gap between the radiation space and the hot air discharge space is formed on the outer pipe side of the partition plate, and a hot air outlet is provided on the radiation space side of the inner pipe. Radiant tube of radiant heater device characterized by being arranged in the length direction