JP2539041Y2 - Snow melting structure in the roof valley - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application field] The present invention relates to a snow melting roof structure using a heating unit embodied by applying the basic principle of a so-called skin current heating tube. The present invention relates to a concrete snow melting structure in a valley of a roof.

[Conventional technology]

In recent years, so-called skin current heating tubes (or induction current heating tubes) have been used for the purpose of heating and raising the temperature of a substance that solidifies at normal temperature, such as fuel oil, and maintaining the temperature of the pipeline when transporting the pipeline. Are being used.

The basic configuration of this skin current heating tube is as follows, for example, by drawing one insulated wire through the inner hole of a steel tube (ferromagnetic tube) as described in “Electrical Engineering Handbook”, 1978, p. And a circuit formed by connecting the steel pipe and the insulated wire in series to a commercial frequency AC power supply, and applying a voltage of, for example, 0.3 to 0.7 V per 1 m of pipe length to the circuit,
It is configured so that a current of 0 to 250 A flows. According to this, due to the skin effect of the alternating current, the current flows intensively in the inner skin of the steel pipe, and the steel pipe generates heat accordingly, and a negligible small current flows on the outer surface of the steel pipe. Stay flowing. Therefore, even if this is used as a heating tube, problems such as generation of an arc and electric shock do not occur.

Furthermore, as an application of the above skin current heating tube,
A plurality of, for example, two steel pipes are arranged in parallel, and both ends of both steel pipes are short-circuited, and one insulated wire forming a closed loop is passed through the inner hole of both steel pipes, and A configuration in which the skin effect and the heat generation effect are obtained in the same manner as described above by passing an alternating current is also known (the details will be described later).

On the other hand, the roof structure of buildings such as prefabricated houses
Basically, a base plate is fixed above a roof frame material (main building), and a roofing member made of a tile, a color vest, a molded steel plate, or the like is laid above the base plate. To describe a more detailed specific example of this type of roof structure, a roof frame material (main building) is fixed directly above a climbing beam, and a field board is pasted directly above the roof frame material. Further, asphalt roofing or the like is laid directly above the baseboard to ensure waterproofness, and a roofing material is laid on the top in such a state.

In order to make the above-mentioned roof structure have a heat retaining effect in response to a request in a cold region or the like, it is general to adopt a method of pasting a heat insulating material over the above-mentioned base plate or above the asphalt roofing. Have been.

[Problems to be solved by the invention]

However, only the method of pasting the heat insulating material above the field board as in the above-described conventional technique can only provide a certain degree of heat retaining effect and cannot naturally perform a positive heating action. For this reason, in a snowy area, a large amount of snow remains on the roof, and various troubles are caused unless troublesome and complicated snow removal work such as snow removal is performed.

Although it is theoretically possible to use the skin current heating tube of the above example for snow melting on the roof, there is a problem in which part of the building and in what state the skin current heating tube is optimally mounted. There is.

Furthermore, when a valley exists on the roof of a building, there is a problem in that the configuration of the valley can be used to cope with the snow melting reliably.

The present invention has been made in view of the above-mentioned circumstances, and facilitates transportation work and mounting work by unitizing using a configuration suitable for a skin current heating tube and efficiently radiates heat to a heated portion. It is another technical object of the present invention to reliably cope with snowmelt in the valleys of the roof and to reduce as much as possible the adverse effects of snow in heavy snow areas.

[Means for solving the problem]

As a specific means for achieving the above technical object, a plurality of ferromagnetic tubes arranged in parallel and an AC voltage applied through an inner hole of the plurality of ferromagnetic tubes are applied. A plurality of insulated wires, a first conductive plate fixed and supported such that both ends of the plurality of ferromagnetic tubes in the longitudinal direction are in a conductive state, and a central portion in the longitudinal direction of the plurality of ferromagnetic tubes. And a second plate member having a high thermal conductivity fixedly supported, and a plurality of heat generating units are respectively provided below the roofing material and on both sides of a valley line in a valley of the roof as a boundary. And the tip of the first plate member on the valley line side of the heat generating unit is formed so as to be inclined so as to be parallel or substantially parallel to the valley line.

In this case, it is also possible to lay a heat generating unit at the bottom of the valley of the roof so as to extend along the valley line.

[Action]

According to the above means, by fixing both ends in the longitudinal direction of the plurality of ferromagnetic tubes arranged in parallel to the conductive first plate member, both ends of each ferromagnetic tube are fixed. In this state, a short-circuit occurs, and in this state, an AC current flows through one insulated wire passed through the inner hole of each ferromagnetic tube, and a skin effect appears. As a result, each ferromagnetic tube generates heat, and almost no current flows on the outer surface of the ferromagnetic tube, so that there is no danger of electric leakage. In this case, since the central portions in the longitudinal direction of the plurality of ferromagnetic tubes are fixed to the second plate member having high thermal conductivity (excellent in thermal conductivity), the second ferromagnetic tubes are heated by the action of the heated ferromagnetic tubes. The heat is evenly and efficiently conducted to the second plate member, so that the roof member is appropriately radiated with heat, so that the roof member is efficiently heated.

In the valley portion of the roof, the tip of the first plate material on the valley line side of each of the first plate materials fixing both ends of the ferromagnetic tube of the heat generating unit is connected to the valley line. Since it is formed in an inclined shape so as to be parallel or substantially parallel, a large gap is not formed between the facing portions of the heat generating units located on both sides of the valley, that is, even in the vicinity of the valley line. The heat generating unit can be laid without gaps, and snow melting at the valley of the roof can be reliably performed.

In addition, arranging the heat generating unit at the bottom of the valley portion of the roof so as to extend along the valley line is advantageous when the shape of the valley portion is linear only in the direction along the valley line.

[Embodiment] An embodiment of the present invention will be described below with reference to FIGS. 1 to 9.

First, the schematic configuration of the snow melting roof structure according to the present invention will be described with reference to FIG.
1a, a plurality of color vests 2... 2 are laid on the upper surface of the roof 1, and a plurality of heat generating units 3. Has been pasted. A predetermined voltage (AC voltage) is applied from a power supply in the control unit 4 between the terminals a and b on one end of the roof 1, and the plurality of heats are generated by applying this voltage. A predetermined current (alternating current) flows through the insulated wires (described later) of the units 3... 3.

To explain the detailed structure of the roof 1, as shown in FIG. 2, a field board 7 is fixed above a roof frame member (main building) 6,. A heat insulating material 9 is attached above the heat insulating material 9 via an asphalt roofing 8, and a plurality of the above-described heat generating units 3 are laid above the heat insulating material 9.
Are arranged above the color vest 2.

The specific structure of the heating unit 3 is the third or fourth.
As shown in the figure (view from the back side), one insulated wire 11 is passed through the inner hole of a plurality of ferromagnetic tubes (steel tubes) 10. Book ferromagnetic tube
The two ends of the ferromagnetic tubes 10... 10 are fixed to conductive first plate members (eg, iron plates) 12, 12 so as to be in a conductive state. Is fixed to a second plate material (for example, an aluminum or aluminum alloy plate) 13 having a high thermal conductivity. More specifically, both end portions of the plurality of ferromagnetic tubes 10 are fixed to the first plate members 12 by welding, and the center portions thereof are engaged with the engagement protrusions 13a formed on the second plate member 13. It is fixed to the second plate 13 by being fitted into 13a. As shown in FIG. 3, with respect to the heat generating unit 3 disposed in the vicinity of the valley 1a of the roof 1, the tip 12a of one of the two first plates 12, 12 is inclined. The inclined tip portion 12a is parallel to the valley line W of the valley portion 1a of the roof 1 shown in FIG. As shown in FIG. 4, two heat-generating units 3 are arranged at positions other than the vicinity of the valleys 1a.
Are both rectangular. In this case, the size of the gaps X, X formed between the first plate members 12, 12 and the second plate member 13 can be appropriately changed. As shown in FIG. 5, both side edges 13b, 13b of the second plate 13 are bent in a U-shape, and a pair of reinforcing ribs 13c, 13c are provided at the center in the width direction. And a pair of reinforcing ribs 13 near the both side edges 13b, 13b.
Fixing members 14,... such as nails are driven between c and 13c. When the heat generating unit 3 is laid on the roof (see FIG. 2), the fixing members 14... 14 such as the nails are driven into the field board 7.

On the other hand, as shown in FIG. 6, when the valley bottom of the valley 1a of the roof 1 is not angular and has a flat portion having a predetermined width, the valley bottom generates heat in the direction along the valley line. Units 3 ... 3 may be provided.

Here, the basic heat generation principle of the heat generating unit 3 will be described. As shown in FIG. 7, one insulated wire 21 is passed through the inner hole of the ferromagnetic tube 20 and is insulated from the ferromagnetic tube 20. A circuit is formed by connecting the electric wire 21 and an AC power supply 22 having a commercial frequency in series.
Apply a voltage of 0.3-0.7V. As a result, a current of 50 to 250 A flows through the circuit, but due to the skin effect of the alternating current, the current flows intensively to the inner skin of the ferromagnetic tube 20, and the ferromagnetic As the tube 20 generates heat, only a negligible voltage appears on the outer surface of the ferromagnetic tube 20. It is to be noted that this slight voltage can be made completely negligible if necessary by short-circuiting the outer surface of the ferromagnetic tube 20 by any method. Even if is used as a heating element, there is no danger such as generation of an arc or electric shock. In addition, as shown in FIG.
May be adopted as a primary circuit and the ferromagnetic tube 20 as a secondary circuit. In this case, the one shown in FIG. 7 is called a series skin current heating tube, and the one shown in FIG. 8 is called an induction skin current heating tube. These are the "Electrical Engineering Handbook" edited by the Institute of Electrical Engineers of Japan, 1978 edition. 1578
It is described in detail on the page. Further, as an improvement of the above configuration, for example, according to Japanese Patent Publication No. 46-588, as shown in FIG. 9, a plurality (two in the illustrated example) of ferromagnetic tubes 20, 20 are provided. The two ferromagnetic tubes are arranged in parallel.
In addition to short-circuiting both end tubes A, A of 0, 20 and passing one insulated wire 21 forming a closed loop through the inner hole of both ferromagnetic tubes 20, 20, AC power is supplied from the power supply 22 to the insulated wire 21. There is disclosed one in which a skin effect and a heat generation effect are obtained in the same manner as described above by flowing an electric current.

The heating unit 3 shown in FIGS. 3 and 4 is configured based on the principle disclosed in the above-mentioned publication. Therefore, by passing an AC current from the control unit 4 to the insulated wire 11 shown in FIG. The ferromagnetic tubes 10 generate heat, and this heat is radiated from the second plate 13 so that the color vests 2..., Which are roofing materials, are warmed, and the roof 1 can melt snow. In this case, it is preferable that the number of ferromagnetic tubes 10 attached to one heating unit 3 is an even number.

The control unit 4 has a built-in temperature adjusting means, which changes the voltage value (or current value) applied between the terminals a and b shown in FIG. Alternatively, when a voltage is periodically applied between the terminals, the period is changed.

In this case, the number of the terminals and the location of the terminals, the number of the control units 4, and the presence / absence of the temperature control means are not limited to those described above, and the design can be changed as appropriate.

In the above embodiment, the color vest 2 is used as a roofing material.
The present invention is applied to a roof structure using… 2, but it is also possible to apply the present invention similarly to a roof structure using tiles, continuous molded steel plates, etc. Needless to say,

[Effect of the invention]

Since the snow melting structure in the valley of the roof according to the present invention is configured as described above, the following effects can be obtained.

That is, according to the snow melting structure of the first aspect, the ferromagnetic tube generates heat due to the skin effect of the ferromagnetic tube fixed in parallel so as to be in a conductive state with the first plate member, and the heat is generated. The heat is uniformly and efficiently transmitted from the ferromagnetic tube to the second plate member, and the second plate member satisfactorily radiates heat to the roofing material, so that snow melting on the roof is effectively performed.
In the valley portion of the roof, the tip of the first plate member of the heat generating unit is inclined so as to be parallel or substantially parallel to the valley line in the valley portion. Also, the heat generating unit can be laid without gaps, and snow melting at the valley of the roof can be reliably performed.

Further, according to the snow melting structure of claim (2), even if the valley bottom of the roof forms a flat portion with a predetermined width, it is possible to lay the heating unit densely, and Even if the shape is peculiar, the melting of snow is surely performed.

[Brief description of the drawings]

1 to 9 show an embodiment of the present invention.
The figure is a partially cutaway perspective view of a building showing an example of the snow melting structure according to the present invention, FIG. 2 is an enlarged vertical sectional side view of a main part of a roof showing an example of the snow melting structure according to the present invention, and FIG. FIG. 4 is a single perspective view showing an example of a heat generating unit used in the snow melting structure according to the present invention, FIG. 4 is a single unit perspective view showing another example of the heat generating unit used in the snow melting structure according to the present invention, and FIG. FIG. 6 is an enlarged vertical sectional side view of a heat generating unit used in the snow melting structure according to the present invention, FIG. 6 is a perspective view of a main part of a roof showing another example of the snow melting structure according to the present invention, and FIG. FIG. 8 is a schematic perspective view of an essential part showing an example of a basic heating principle of a heating element. FIG. 8 is a schematic perspective view of an essential part showing another example of a basic heating principle of a heating element used in the heating unit. ,
FIG. 9 is a vertical sectional front view of a main part for showing a substantial heating principle of a heating element used in the heating unit. 1 Roof 1a Valley 2 Roofing material (color vest) 3 Heating unit 10 Ferromagnetic tube 11 Insulated wire 12 First plate 13 Second plate W … Tani Line

Claims (2)

(57) [Scope of request for utility model registration] 1. A plurality of ferromagnetic tubes arranged in parallel, one insulated wire to which an AC voltage is applied through an inner hole of the plurality of ferromagnetic tubes, and a plurality of ferromagnetic tubes A conductive first plate member fixedly supported so that both ends in the longitudinal direction of the ferromagnetic tube are in a conductive state, and a second high heat conductive member fixedly supported in the longitudinal center of the plurality of ferromagnetic tubes. A heat generating unit is constructed from the sheet material of the above, and both sides of the valley line in the valley portion of the roof below the roofing material, respectively,
A plurality of heat generating units are laid, and the tip of the first plate member on the valley line side of the heat generating unit is formed to be inclined so as to be parallel or substantially parallel to the valley line. Snow melting structure in the valley of the roof. 2. The snow melting structure in a valley of a roof according to claim 1, wherein a heat generating unit is laid at a bottom of the valley of the roof so as to extend along the valley line.