JP2539042Y2 - Snow melting roof structure - 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 snow melting structure of a roof provided such that a lower surface of a roofing material is inclined with respect to an upper surface of a main plate.

[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, in the case of using a specific roofing material on the roof of a building, the lower surface of the roofing material is inclined with respect to the upper surface of the field board, but in this case, the snow on the roof is reliably melted. The problem is how to deal with this problem.

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. The technical task is to make sure that snow melts in the roof structure where the lower surface of the roofing material is inclined with respect to the upper surface of the field board, and to reduce the adverse effects of snow in heavy snow areas as much as possible. is there.

[Means for solving the problem]

The specific means for achieving the above technical problem is that the roofing material is laid in parallel in a roof structure in which the roofing material is laid so that the lower surface of the roofing material is inclined with respect to the upper surface of the field board. A plurality of ferromagnetic tubes, an insulated wire through which the AC voltage is applied through the inner holes of the plurality of ferromagnetic tubes, and both ends of the plurality of ferromagnetic tubes in the longitudinal direction conduct. A heat generating unit is constituted by a conductive first plate member fixed and supported so as to be in a state, and a second plate member having a high thermal conductivity in which the longitudinal central portions of the plurality of ferromagnetic tubes are fixed and supported. In addition, the heat generating unit is disposed above the base plate and below the roofing material, and the second heat generating unit is provided with the second plate material so that the lower surface of the roofing material and the second plate material of the heat generating unit can be closely contacted. Was placed at an angle to the top surface of the field board In the filtrate.

[Action]

According to the above-mentioned means, for the heating unit, each of the ferromagnetic tubes arranged in parallel is fixed at both ends in the longitudinal direction to the first plate material having conductivity so that each ferromagnetic tube is electrically connected. Both ends of the tube are short-circuited. Therefore, in such a state, an AC current is applied to a single insulated wire passed through the inner hole of each ferromagnetic tube, whereby a skin effect appears, and the current is increased in each case. As a result, the ferromagnetic tubes generate heat, and almost no current flows on the outer surface of the ferromagnetic tubes, causing no danger of electric leakage. It will not be. 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.

The second plate member of the heat generating unit is inclined with respect to the upper surface of the base plate, and therefore, a specific roofing material (such as a tile or a horizontal steel plate) laid in an inclined state with respect to the upper surface of the base plate. ), The second plate can be closely contacted with the lower surface, so that heat is directly conducted from the second plate to the roofing material, the efficiency of heat conduction to the roofing material is improved, and snow melting on the roof is reduced. It will be assured.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS.

First, the schematic configuration of a snow-melting roof structure according to the present invention will be described with reference to FIG. 1. In the roof 1 of the building, a plurality of horizontal roofing plates 2... 2 are used as roofing materials. These horizontal roofing plates 2... 2 are made of a steel plate. In addition, the size of one piece of the horizontal roofing plate material 2 is short in the vertical direction from the eaves part to the ridge part, which is equivalent to the dimension of about one sheet of a normal roof tile, and in the horizontal direction orthogonal to this. About the size of many ordinary tiles (for example, 90cm ~
100 cm) and is obtained by molding into a predetermined shape by molding or the like.

On the other hand, a plurality of heat generating units 3... 3 are attached below these horizontal roofing plates 2. 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.
2 are arranged above the roof.

As shown in FIG. 3 (a view from the back side), a specific structure of the heat generating unit 3 is such that one insulating hole is provided in an inner hole of a plurality of ferromagnetic tubes (steel tubes) 10. The electric wire 11 is passed through, and both ends of the plurality of ferromagnetic tubes 10 are connected to first conductive plate members (for example, iron plates) 12,1.
2, a plurality of ferromagnetic tubes 10... 10 having a central portion in the longitudinal direction formed of a second plate (eg, an aluminum or aluminum alloy plate) having a high thermal conductivity.
It is fixed at 13. Specifically, the first plate material is welded to both ends of the plurality of ferromagnetic tubes 10.
12 and 12, the center of which is the second plate 13
Is fixed to the second plate 13 by being fitted into the engagement projections 13a formed in the second plate 13. Incidentally, 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. 4, one (left) side edge 13b of the second plate 13 is bent inward and the other (right) side edge 1
3b is bent outward, and a pair of reinforcing ribs 13c, 13c are formed at the center in the width direction, and between the vicinity of the both side edges 13b, 13b and between the pair of reinforcing ribs 13c, 13c. The fixing members 14... 14 such as nails are driven.

Then, under a state in which the heat generating unit 3 is laid on the roof (see FIG. 2), only the second plate 13 of the heat generating unit 3 located at the eaves end side is in a state parallel to the upper surface of the field plate 7. On the other hand, the other second plate 13 of the heat generating unit 3 is inclined with respect to the upper surface of the base plate 7, and therefore, the lower surface of each of the horizontal roofing plates 2. 3 are in close contact with the upper surfaces of the second plate members 13. In this state, the heat generating unit 3 is firmly fixed to the base plate 7 by the fixing members 14... 14 such as the nails.

In this embodiment, as shown in FIG. 5, the mounting state of each of the horizontal roofing plates 2,..., Is such that the upper edge 2a of the horizontal roofing panel 2 existing on the lower side (eave side) is folded into a U-shape. While singing,
The lower edge 2b of the horizontal roofing plate member 2 existing on the upper side (ridge side) is also bent in a U-shape, and the mounting bracket (suspension element) K is connected to the above with the two edges 2a and 2b locked. By attaching the mounting bracket K to the wood-based board 15 fixed to the upper surface of the heat insulating material 9 and fitting it to the upper edge portion 2a, each of the horizontal roofing boards 2. That is.

Here, the basic heat generation principle of the heat generating unit 3 will be described. As shown in FIG. 6, 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. Also, 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. 6 is called a series skin current heating tube, and the one shown in FIG. 7 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 on the above-described configuration, for example, according to Japanese Patent Publication No. 46-588, as shown in FIG. 8, a plurality of (two in the illustrated example) ferromagnetic tubes 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 FIG. 3 is configured on the basis of the principle disclosed in the above-mentioned publication. Therefore, by passing an alternating current from the control unit 4 to the insulated wire 11 in FIG. .. 10 generate heat, and this heat is radiated from the second plate member 13 to heat the roofing plate members 2... 2 that are roofing members, so that 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.

Further, in the above-described embodiment, as the roofing material, horizontal roofing plate materials 2.
The present invention is applied to a roof structure using a roof, but separately from this, a roof using a roofing material whose lower surface is inclined with respect to the upper surface of a field board such as a tile As far as the structure is concerned, it goes without saying that the present invention can be similarly applied.

[Effect of the invention]

As described above, according to the snow-melting roof structure according to the present invention, 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. And since the said 2nd board | plate material is made into the inclined state with respect to the field board, and is in the state closely contacted with the lower surface of the roofing material, heat is directly conducted to the roofing material from this 2nd board material, and therefore, The heat transfer efficiency to the roofing material is improved, and snow melting on the roof is further ensured.

[Brief description of the drawings]

1 to 8 show an embodiment of the present invention.
FIG. 2 is a partially cutaway perspective view of a building showing a snow melting roof structure according to the present invention. FIG. 2 is an enlarged vertical sectional side view showing a main part of the snow melting roof structure according to the present invention. FIG. 3 is a snow melting roof according to the present invention. FIG. 4 is a perspective view showing an exothermic unit used in the structure, FIG. 4 is an enlarged longitudinal sectional side view of the exothermic unit used in the snow melting roof structure according to the present invention, and FIG. 5 is used in the snow melting roof structure according to the present invention. FIG. 6 is a schematic perspective view of an essential part showing an example of a basic heating principle of a heating element used in the heating unit, and FIG.
FIG. 8 is a schematic perspective view showing another example of the basic heating principle of the heating element used in the heating unit. FIG. 8 shows the substantial heating principle of the heating element used in the heating unit. It is a longitudinal section front view of the main part for the. DESCRIPTION OF SYMBOLS 1 ... Roof 2 ... Roofing material (horizontal board) 3 ... Heating unit 7 ... Field board 10 ... Ferromagnetic tube 11 ... Insulated wire 12 ... 1st board 13 ... 2nd board

Claims (1)

(57) [Scope of request for utility model registration] 1. A roof structure in which a roofing material is laid so that a lower surface of the roofing material is inclined with respect to an upper surface of a field board, wherein a plurality of ferromagnetic tubes arranged in parallel; One insulated wire to which an AC voltage is applied by being passed through the inner hole of the ferromagnetic tube, and a conductive material fixed and supported so that both ends in the longitudinal direction of the plurality of ferromagnetic tubes are in a conductive state respectively. A heat generating unit is constituted by a first plate having the first plate and a second plate having a high thermal conductivity in which central portions in the longitudinal direction of the plurality of ferromagnetic tubes are fixedly supported, and the heat generating unit is disposed above the base plate. And the second plate is inclined with respect to the upper surface of the field board so that the lower surface of the roof and the second plate of the heat generating unit can be in close contact with each other. A snow-melting roof structure, characterized by being arranged in a vertical direction.