Hot-air heater
a heater and hot air technology, applied in the field of hot air heaters, can solve the problems of increasing the operating sound, increasing the size of the relevant appliance, and reducing the wind speed
Inactive Publication Date: 2004-06-03
RINNAI CORP
View PDF15 Cites 1 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Benefits of technology
[0011] According to the present invention, when the air-blowing fan is operated, air is sucked into an air passage and thus reaches the electric heater. In this case, the air trunk area of the storage portion, in which the electric heater is contained, has been increased so that the air-blowing resistance in this portion does not increase and can, therefore, be made nearly equal to the air-blowing resistance of the air-blowing passage in front of and behind this storage portion. Therefore, the air flows through the air-blowing passage smoothly and the rotation speed of the air-blowing fan does not need to be increased.
[0012] In this case, if the air trunk area on the downstream side of said expansion is decreased smoothly, the occurrence of turbulent flow can be prevented and thus the resistance of air flowing along an inner surface of the expansion can be decreased, which will, thereby, further decrease the air trunk resistance.
[0014] In case said air-blowing passage has a bent portion formed halfway through it, said air-blowing fan is equipped with a moving vane positioned at the bent portion. Furthermore, the electric heater is positioned at the expansion, that is, on the downstream side of this bent portion, in such a manner that it intersects with the air-blowing passage. Thus, the volume of air flowing through the inner side of the bent portion decreases compared to that flowing through its outer side; therefore, the air-blowing passage positioned on the inner side of the bent portion is overheated by radiation heat etc. from the electric heater, increasing the risk of the appliance itself getting overheated by the excess radiation heat etc. Therefore, preferably, the space between the inner wall of the expansion positioned on the inner side of the expansion and the electric heater is increased compared to the space between the inner wall of the expansion positioned on the outer side of the bent portion and the electric heater. This not only ensures smooth air flow but also prevents the overheating of the appliance.
[0015] Further, it is possible to prevent the overheating of the appliance, which is influenced by the expansion of the electric heater, even if this expansion is overheated by providing heat insulation means around the expansion of said electric heater.
[0016] Furthermore, if said expansion has a double structure, comprising the inner and outer walls of the air-blowing passage and the airspace between them, then this structure can decrease thermal conductivity, thereby improving the heat insulation effects.
Problems solved by technology
Therefore, to provide sufficient airflow to the hot air to be blasted out of the outlet, it is necessary to increase the rotation speed of the air-blowing fan; however, this increases the operating sound, which, in turn, poses a problem.
In this case, to decrease the air trunk resistance, increasing the cross-sectional area of the air-blowing passage may be considered (hereinafter referred to as air trunk area); however, this increases the size of the relevant appliance and decreases the wind speed, which, in turn, poses a problem.
Thus, the volume of air flowing through the inner side of the bent portion decreases compared to that flowing through its outer side; therefore, the air-blowing passage positioned on the inner side of the bent portion is overheated by radiation heat etc. from the electric heater, increasing the risk of the appliance itself getting overheated by the excess radiation heat etc.
Furthermore, if said expansion has a double structure, comprising the inner and outer walls of the air-blowing passage and the airspace between them, then this structure can decrease thermal conductivity, thereby improving the heat insulation effects.
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0026] In FIG. 1, the reference numeral 1 indicates a hybrid-type hot-air heater according to the present invention. This hot-air heater 1 has a box-shaped frame 11, which incorporates a gas heater portion 2 on the top and an electric heater portion 3 at the bottom. A first outlet 12a and a second outlet 12b are formed at the front face of frame 11 and a first inlet 13a and a second inlet 13b are formed at the rear face of frame 11 to face the gas heater portion 2 and the electric heater 3, respectively. This arrangement ensures that the two air-blowing fans used to make the air-blowing system of the gas heater portion 2 and that of the electric heater portion 3 are independent of each other.
[0027] The gas heater portion 2 constitutes a gas burner 20 and a first air-blowing fan 21, which is arranged below the gas burner 20. The gas heater portion 2 not only supplies the gas burner 20 with combustion air, but also mixes the combustion gas with air sucked through the first inlet 13a i...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
Because the air trunk area of the air blowing passage on the downstream side of the air-blowing fan was kept almost constant in a conventional hot-air heater, an electric heater provided in this air blowing passage provided air trunk resistance by itself making it necessary to increase the rotation speed of the air blowing fan thereby resulting in the operating noise growing louder which, in turn, posed a problem. Therefore, an expansion 35 was formed along the air blowing passage 32 that passes from the intake opening 11b through the exhaust opening 12b. This expansion functions as a storage portion that contains the electric heater 3.
Description
[0001] 1. Field of the Invention[0002] The present invention relates to a hot-air heater in which an electric heater is incorporated along an air-blowing passage.[0003] 2. Description of the Related Art[0004] A conventional hot-air heater, as described in Jpn. Pat. Appln. KOKAI Publication No. 1998-132385, comprises a frame having an outlet and an inlet formed therein. An air-blowing passage is formed in the frame that leads from the inlet to the outlet. This air-blowing passage is provided with an air-blowing fan on the upstream side and an electric heater, constituting an elongated sheathed heater etc. on the downstream side. In this case, the electric heater is positioned in such a manner that it intersects with the air flowing along the air-blowing passage. In this configuration, if the air-blowing fan is operated, air is sucked into the air-blowing passage through the inlet and heated by the electric heater to provide hot air having a predetermined temperature, which is blasted...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More IPC IPC(8): F24H3/04F24H3/12
CPCF24H3/04Y02B30/28F24H3/0488F24H3/0417Y02B30/00
InventorSHIMONOMA, YOKIHIKOITO, KEICHIFUJISAWA, YOSHINORIYAMADA, YOSHIMUNE
OwnerRINNAI CORP