JP3132085U - Heating element for hot air generator - Google Patents

Abstract

The present invention provides a heating element having a structure that makes it easy to adjust the amount of heat generated by a hot air generator that supplies hot air or hot air, and allows adjustment of the amount of air flow to an ideal range.
[MEANS FOR SOLVING PROBLEMS] A plurality of honeycomb or rectangular holes (11) are formed in a cross section of an electrically insulating tubular body (1) made of quartz glass, glassy ceramics, aluminum oxide ceramics, etc. and having a sectional diameter of about 38.5 to 50 mm. A heating element used for generating hot air by forming a path and forming an electric resistance film on the inner surface of the ventilation path. It can be prepared by cutting the length of the heating element according to the demand for heat generation capacity and the like.
[Selection] Figure 1

Description

  The present invention relates to an improved structure of a heating element for generating hot air, and in particular, a tubular body made of an electrically insulating material whose surface is plated with an electric resistance film, having a cross-sectional diameter of about 38.5 to 50 mm and a plurality of cross-sectional shapes. The present invention relates to a structure in which the amount of ventilation can be adjusted to an ideal range by having a honeycomb-shaped or rectangular through-hole.

  In general, the purpose of generating hot air is to warm or heat a target article gently and slowly to soften or dry it. The generation of hot air is roughly divided into a combustion type and an electric heating type. The combustion type mainly uses city gas, natural gas or other combustible gas or liquid as fuel, and generates heat by combustion. In the electric heating type, the current is used as a heat source by the resistance heat of the resistance heating element, or the PTC (Positive Temperature Coefficient) electronic component accumulates the heat.

  Simultaneously with the generation of the above-mentioned heat, an air blower such as a fan sends an air flow from one of the heat sources, passes the air flow through the heat source, and sends it from the other end to generate the necessary hot air.

  In a general hot air device, a constant temperature and air volume can be balanced by adjusting the heat generation amount of the heat source to the air flow rate. That is, it cannot be said that any of the hot air generators that have the heat generation amount of the hot air generator too low or the amount of air blown is excellent. In particular, in order to obtain a sufficient amount of air flow in a short heat pipe, not only must the flow resistance of the air flow be lowered, but at the same time a sufficient amount of heat must be generated in a timely manner. Meeting the needs of both companies is an important point of hot air equipment.

Conventional electric heating type hot air generators accumulate heat once generated in an element of a pipe-like structure or an electric heating pipe structure as a heat source, and also serve as an air passage through which airflow flows. The electric heating type has high power consumption, is unstable in temperature, and has disadvantages such as excessive ventilation resistance when airflow is circulated, and needs to be improved.
Japanese Patent Laid-Open No. 10-197166 JP-A-9-71466

  In view of the prior art, the present inventor has filed an application for a “heating element for generating hot air” in a known patent application No. 095140465 (Japanese patent application No. 2006-33387). The technical principle is that a tubular substrate is made of materials such as quartz glass, glassy ceramics or aluminum oxide ceramics, an electric resistance film is formed on the surface of the tubular substrate, and conductive electrode terminals are installed on both ends of the substrate. The electric resistance film generates heat by supplying power from the electrode terminal, and hot air is generated by blowing air from one side. Here, further improvement was necessary to increase the air flow rate.

In order to solve the above-mentioned object, the present invention improves the heating element for generating hot air and has an electrically insulating tubular shape such as quartz glass, glassy ceramics or aluminum oxide ceramics having an electric resistance film formed on the surface. By configuring the main body with a specific structure and size, the ventilation rate is further improved. The tubular body has a cross-sectional diameter of 38.5 to 50 mm, a cross-sectional shape is an aggregate structure of a plurality of honeycomb-shaped or rectangular openings, and the distance between the ends of the honeycomb-shaped holes is 3.36 to 4.5 mm, The corner distance is 3.81 to 4.9 mm, and the distance between the ends of the square hole is 2.5 to 4.5 mm.

  With the above size, according to the experiment, the wind speed reaches 10.1 to 18.0 meters / second, and according to the embodiment with the pipe length 15.1 to 30.0 mm, the heat generation efficiency is ideal of 720 to 1800 watts Reach the range of use.

  According to the hot air generating device of the present invention, the manufacturer can meet the needs of the characteristics of different products by adjusting the length of the pipe that becomes the heat generating structure by itself in response to the needs of different products.

  FIG. 1 and FIG. 3 show an improved hot air generator of the present invention. An electrically insulating tubular body (1) made of quartz glass, vitreous ceramic, aluminum oxide ceramic or the like having an electric resistance film plated on its surface is formed into a tube having a cross-sectional diameter of about 38.5 to 50 mm.

  FIG. 2 and FIG. 4 show that the electrically insulating tubular body (1) made of quartz glass, glassy ceramics, aluminum oxide ceramics, or the like whose surface is plated with an electric resistance film has a cross section of a plurality of honeycombs. Hole (11) or rectangular hole (12), and the distance (D1) between the ends of the honeycomb holes (11) is 3.36 to 4.5 mm, the distance between the corners (D2 ) Is set to 3.81 to 4.9 mm, and for square ones, the distance (D3) between the ends of the square holes is set to 2.5 to 4.5 mm.

  The improved hot air generator of the present invention is characterized in that a good air flow rate and an appropriate thermal effect can be obtained by the above-described embodiment size.

  The improved hot air generator of the present invention has a cross-sectional diameter and a hole diameter of the cross-sectional shape based on the above structure, and the length of the pipe that determines the heat generation capacity is determined by the manufacturer based on different needs and characteristics of the product. Can be adjusted freely.

It is sectional drawing of the electrically insulated tubular main body of the improved hot air generator of this invention. FIG. 2 is an enlarged cross-sectional view of a local portion of the electrically insulating tubular main body of FIG. FIG. 5 is a cross-sectional view of a second embodiment of the electrically insulating tubular body of the improved hot air generator of the present invention. FIG. 4 is a partial enlarged cross-sectional view of the electrically insulating tubular main body of FIG.

Explanation of symbols

1 Electrically insulated tubular body
11 honeycomb hole
12-sided hole
D1 Honeycomb hole end-to-end distance
D2 Honeycomb hole corner to corner distance
D3 Square hole end-to-end distance

Claims (2)

  An electrically insulating tubular body made of quartz glass, glassy ceramics or aluminum oxide ceramics with an electric resistance film plated on the surface is formed into a tubular body having a cross-sectional diameter of about 38.5 to 50 mm, and a plurality of honeycombs are formed in the cross section. Or a square hole, the distance from the end of the honeycomb hole to the edge is 3.36 to 4.5 mm, the distance between the corners is 3.81 to 4.9 mm, or the distance between the ends of the square hole is A heating element for a hot-air generator, characterized by having a thickness of 2.5 to 4.5 mm.   The length of the tube of the electrically insulating tubular body made of quartz glass, glassy ceramics or aluminum oxide ceramics with an electric resistance film plated on the surface is set to 15.1 to 30.0 mm to meet the heating capacity etc. 2. The heating element for an improved hot air generator according to claim 1, wherein:

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