JP3396134B2 - Heater device and piping with heater - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heater device used to prevent freezing of piping in cold regions, for example. Further, for example, the present invention relates to a pipe to which a heater for preventing freezing is attached.

[0002]

2. Description of the Related Art As shown in FIG. 15, a roof having a small inclination such as a flat roof 90 is usually provided with a roof drain 91 for discharging accumulated rainwater and the like. Rainwater on the flat roof 90 is discharged from the roof drain 91 through a vinyl chloride pipe 92 to a sewer pipe (not shown) in the ground.

By the way, in cold regions such as Hokkaido, for example, water discharged from the roof drain 91 may freeze in the pipe 92 at night. Specifically, the pipe 92
In the portion 93 provided indoors and the portion 94 buried underground, the drainage is not frozen by the indoor heat and the geothermal heat, respectively, but is piped between the floor 95 and the ground 96. There is a risk that the pipe 92 will freeze at the portion 97 and the pipe 92 will break at this portion.

Therefore, in the technique disclosed in Japanese Utility Model Application Laid-Open No. 59-35520, a heat pipe heated by the heat of ground water is projected into the pipe to prevent freezing in the pipe. However, this technology can prevent freezing only in areas where groundwater exists. As another technique for preventing freezing in a pipe, Japanese Utility Model Publication No. 5-20819 discloses a technique for preventing freezing in a pipe by disposing an electric heater wire in the pipe. . However, in order to prevent abnormal overheating of the electric heater wire, a heat generation temperature control device such as a thermostat is required, which increases the initial cost of the device.

Further, Japanese Patent Application Laid-Open No. 7-189307 discloses an apparatus in which running cost is reduced by supplying electric power from a solar cell to an electric heating heater wire arranged in a pipe. However, since the solar cell is relatively expensive, the initial cost of the entire device is high. As still another method for preventing freezing in the pipe, it is possible to wind a heater wire around the outer peripheral surface of the pipe and energize the heater wire to heat the pipe itself. However, in this method, in order to prevent abnormal overheating of the heater wire, similar to the technique disclosed in Japanese Utility Model Publication No. 5-20819,
A thermostat or the like is required, which increases the initial cost of the device.

Further, when the supply voltage suddenly changes or the environmental temperature suddenly rises, the heater wire may be abnormally overheated and the pipe may be melted. Therefore, the heater wire cannot be directly attached to the pipe. Therefore, when the pipe is heated by the heat generated by the heater wire, as shown in FIG. 16, the vinyl chloride pipe joints 101 and 102 are provided at both ends of the metal pipe portion 103 made of a metal material such as stainless steel. The heater wire 104 is wound around the outer peripheral surface of the metal tube portion 103. This prevents melting of the pipe due to abnormal heating of the heater wire. The pipe thus created is interposed in the pipe portion 97 between the floor 95 and the ground 96 shown in FIG. 15 to prevent freezing.

[0007]

However, the apparatus shown in FIG. 16 still requires a thermostat and the like, and prevents the pipe joints 101, 102 and the metal pipe portion 103 from directly contacting each other and prevents water leakage. It is very troublesome to make the connection. Further, when the outside of the pipe is covered with a heat insulating material in order to improve the heating efficiency by the heat generating wire, it is necessary to prevent the heat insulating material from directly contacting the heat generating wire.

Further, since the unit shown in FIG. 16 must be inserted in the middle of the pipe, it cannot be attached to the existing pipe. Therefore, an object of the present invention is to solve the above-mentioned technical problems, and to provide a heater device which has a simple and inexpensive structure and can be easily attached to an existing resin pipe. Another object of the present invention is to provide a pipe with a heater that can be configured easily and inexpensively.

[0009]

Invention, there is provided a solution for the] claim 1 for achieving the above object, disposed on the surface of the synthetic resin pipe, a heating device for heat insulating a pipe, the The surface of the pipe facing the surface of the heat transfer to the pipe
Part of the heat transfer plate as the heat transfer surface for
Formed by extruding to the opposite side of the heat transfer surface
Heat transfer member having heater mounting portion and positive temperature coefficient thermistor element
It is formed by insulatingly coating the child with a synthetic resin,
It has a regular through hole, and the gold inserted through this through hole
A metal rivet or bolt is passed through the heater mounting part.
And fix it to the heater mounting part.
Heating, characterized in that it comprises a heater unit eclipsed
Device .

According to the structure of claim 1, the heat generated from the heater unit is transferred to the heat transfer member, and is further applied to the pipe from the heat transfer surface of the heat transfer member. As a result, the temperature of the pipe is kept warm, and for example, freezing of water inside the pipe can be prevented. Further, the heater device according to the present invention,
Since a positive temperature coefficient thermistor element having a self-temperature control function is used, a device such as a thermistor for temperature control is not required. Therefore, the initial cost of the device can be reduced. Further, the piping is not abnormally overheated by the heat generated from the heater unit, and there is no possibility that the piping melts. Even more
The metal rivet or bolt heat transfer member.
The part that protrudes toward the piping side may form the heater mounting part.
Recess caused by and (to partially extrude the heat transfer plate
Since it is housed in the concave portion formed on the heat transfer surface side,
Does not hinder the close contact with the pipe surface.
Therefore, the pipe can be efficiently heated.

Furthermore, since the heater unit is formed by insulatingly coating the positive temperature coefficient thermistor element with synthetic resin, it has excellent waterproofness, and this heater device is used for heating drainage pipes and the like. However, it can have high reliability. Moreover, this heater device can be attached to an existing pipe, which is very convenient.

According to a second aspect of the invention, the heat transfer member is
The heater device according to claim 1, further comprising: a plurality of heat transfer pieces formed in an arc shape along the surface of the pipe, the plurality of heat transfer pieces being combined to cover the surface of the pipe. is there. The plurality of heat transfer pieces are formed so that the cross-sectional shape when cut in a direction orthogonal to the axial direction of the pipe is an arc shape, and the plurality of heat transfer pieces are joined to cover the surface of the pipe. In this state, the plurality of heat transfer pieces are formed to have a circular cross section. Therefore, according to this heater device, the attachment to the existing pipe can be easily performed. Besides,
Since the size of each heat transfer piece can be reduced, its handling is convenient.

According to a third aspect of the present invention, the heat transfer member is
The heater device according to claim 2, further comprising a hinge member that hinges the plurality of heat transfer pieces to each other.
According to the configuration of claim 3, since the plurality of heat transfer pieces are connected to each other in advance by the hinge member, the labor required for assembling the heat transfer pieces along the outer peripheral surface of the pipe is reduced.

According to a fourth aspect of the present invention, the heat transfer member is
The heater device according to claim 1, wherein the heater device is a flexible plate-like member that can be deformed along the outer peripheral surface of the pipe. According to the configuration of claim 4, the heat transfer member can be deformed into a shape that follows the shape of the pipe, so that the heat transfer member can be easily attached to the pipe. Further, since the heat transfer member can be brought into close contact with the pipe, the heat generated from the heater unit is efficiently transferred. Further, since the heat transfer member is a plate-like member, the heater device is not bulky, which is convenient for transportation.

According to a fifth aspect of the present invention, a pipe made of synthetic resin and a surface facing the surface of the pipe are provided for heat transfer to the pipe.
Part of the heat transfer plate as the heat transfer surface for
Formed by extruding to the opposite side of the heat transfer surface
Heat transfer member having heater mounting portion and positive temperature coefficient thermistor element
It is formed by insulatingly coating the child with a synthetic resin,
It has a regular through hole, and the gold inserted through this through hole
A metal rivet or bolt is passed through the heater mounting part.
And fix it to the heater mounting part.
It is a pipe with a heater including a heater unit that can be cut off .

According to the fifth aspect of the present invention, the heat generated from the heater unit is applied to the pipe via the heat transfer layer to keep the pipe warm. Therefore, there is no risk of water freezing in the pipe. Further, similarly to the invention described in claim 1, since it is configured by using the positive temperature coefficient thermistor element, a device such as a thermistor for temperature control is not required, and the initial cost of the device can be reduced. In addition, the piping is not abnormally overheated by the heat generated from the heater unit, and there is no fear that the piping will melt. Furthermore, metal rivets or
Or a portion that penetrates the heat transfer member of the bolt and projects toward the piping side
Is a recess (transmission) formed by forming the heater mounting part.
Concave created on the heat transfer surface side by partially extruding the heat plate
Part) to prevent the heat transfer surface from sticking to the piping surface.
There is no danger of being jealous. Therefore, the piping is efficient
Can be heated.

Further, the heater unit has an excellent waterproof property, and even if this heater device is used for heating a drainage pipe or the like, it can have high reliability. Further, since the heater unit is installed in advance, it is not necessary to retrofit the heater device by incorporating this pipe when building a building or the like.

A sixth aspect of the present invention is the pipe with a heater according to the fifth aspect, further comprising a heat insulating member that covers the pipe. According to the configuration of claim 6,
Since the outer surface of the pipe to which the heater unit is attached is covered with the heat insulating member, the heating efficiency can be improved.

[0019]

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. FIG. 1 is a diagram of a heater device according to an embodiment of the present invention as viewed from diagonally above. 2 is a sectional view of the heater device taken along the section line II-II in FIG. This heater device 1 has, for example, a vinyl chloride pipe 92 shown in FIG.
It is attached to the outer peripheral surface of a portion that is particularly liable to be frozen, specifically, the outer peripheral surface of a portion 97 located between the floor 95 and the ground surface 96, for keeping the pipe 92 warm.

Referring to FIGS. 1 and 2, heater device 1
Has two heat transfer pieces 21 and 22. Heat transfer piece 2
Reference numerals 1 and 22 denote metal plates having excellent thermal conductivity, such as stainless steel plates, which are curved along the outer peripheral surface of the pipe 92. When cut in a direction orthogonal to the longitudinal direction of the pipe 92. The cross section is formed in a semicircular shape. Further, the heat transfer pieces 21 and 22 are formed to have substantially the same length as the length of the pipe 92 to which the heater device 1 is attached.
The heat transfer pieces 21, 22 are formed so as to cover the outer peripheral surface of the pipe 92.

Two heater units H1 and H2 are attached to the outer peripheral surface which is the surface of the heat transfer plate 21. Further, two heater units H3 and H4 are attached to the outer peripheral surface which is the surface of the heat transfer piece 22. That is,
The outer peripheral surfaces of the two heat transfer plates 21 and 22 have the heater unit H.
1 to H4 (hereinafter, simply referred to as "heater unit H" when collectively referred to) as a heater mounting surface.

The heater unit H is an elongated member as a whole, and has four disc portions 62 that accommodate the PTC element heating element 11 (see FIGS. 2 and 3) therein, and four disc portions 62. And a connecting portion 63 connecting the two. The heater unit H is arranged along the longitudinal direction of the pipe 92,
The disk portion 62 is attached to the outer peripheral surfaces of the heat transfer pieces 21, 22 with rivets 61.

FIG. 9 is a diagram showing a simplified connection state of the heater unit. Referring to FIG. 9, lead wires 36 and 37 are drawn out from one end of the heater unit H. These lead wires 36 and 37 are connected to a power cord 85 at a connecting portion 84 so that the voltage of the commercial AC power source 83 is applied in parallel to each heater unit H.

Specifically, as shown in FIG. 10, the conductive wire 85a drawn from the power cord 85 and the lead wire 36 are crimp-connected by the closed end connector 87. Further, the conductive wire 85b drawn from the power cord 85 and the lead wire 37 are pressure-bonded to each other by the closed end connector 86. The connecting portion 84 includes conductive wires 85a and 85.
b and the closed end connectors 86, 87, etc. are configured by being sealed with an insulating resin such as a silicone resin.

As described above, since the heater units H are electrically connected in parallel, if the power cord 85 is connected to the commercial AC power source 83 (see FIG. 9), each heater unit H can be connected to the commercial AC power source. The voltage of 83 is applied in parallel.
Further, since the connecting portion 84 is insulation-sealed with the insulating resin, there is no possibility that a short circuit due to moisture or the like will occur in the connecting portion 84.

11, the lead wire 36 is connected to the parallel terminal 89 crimped to the tip of the conductive wire 85a, and the lead wire 37 is connected to the conductive wire 8 as shown in FIG.
The connection portion 84 may be configured by being connected to the parallel terminal 88 crimped to the tip of the 5b and sealing the conductive wires 85a and 85b and the parallel terminals 88 and 89 with an insulating resin.

Referring to FIG. 1, one end of the heat transfer piece 21 and one end of the heat transfer piece 22 are rotated by hinges 25 and 26 so as to cover the outer peripheral surface of the pipe 92. Connected as possible. In the heater device 1, for example, the inner peripheral surface 24 of the heat transfer piece 22 is brought into close contact with the outer peripheral surface of the pipe 92, and the inner peripheral surface 23 of the heat transfer piece 21 is brought into close contact with the outer peripheral surface of the pipe 92. The piece 21 is attached to the pipe 92 by rotating the piece 21 in the direction of arrow P in the figure. When the heater device 1 is attached to the pipe 92, the heat transfer piece 21,
The inner peripheral surfaces 23 and 24 of 22 are in close contact with the outer peripheral surface of the pipe 92 and form heat transfer surfaces for transferring the heat generated from the heater unit H to the pipe 92. As a result, it is possible to reliably prevent the water and the like from freezing in the pipe 92 due to the heat generated from the heater unit H.

FIG. 3 is an exploded perspective view showing the structure of the heater unit H. The configuration of the heater unit H will be described in detail below with reference to FIGS. 2 and 3.
As described above, the heater unit H includes PTCs (Positive Temperature Coefficients), which are positive temperature coefficient thermistors, inside the four disk portions 62 (see FIG. 1).
The PTC element heating element 11 made of a ceramic semiconductor having characteristics is provided. This PTC element heating element 11 is
The upper power feeding member 31 and the lower power feeding member 32, which are vertically opposed to each other along the longitudinal direction of the heater unit H, are connected in parallel at a constant interval. The heat generating unit including the PTC element heat generating body 11 and the power supply members 31 and 32 is sealed by an upper insulating case 51 and a lower insulating case 52 having an electric insulating property in a state where the cap 41 is covered.

The PTC element heating element 11 is made of, for example, barium titanate as a main raw material and has a low resistance from room temperature to the Curie temperature Tc (rapid change temperature), but when the Curie temperature Tc is exceeded, the resistance suddenly increases. It is a heat-sensitive element having the property of increasing the value. Due to this characteristic, when a voltage is applied to the PTC element heating element 11 at a temperature below the Curie temperature Tc, the resistance value is small at the beginning because of the low temperature, and a large current flows. This causes the temperature to rise rapidly. When the temperature exceeds the Curie temperature Tc, the resistance value suddenly increases, the current value decreases, and the heat generation amount decreases. Therefore, the temperature does not rise above a certain temperature and is stable at a certain temperature. That is, the PTC element heating element 11 has a self-temperature control function.

The PTC element heating element 11 is formed in a disk shape as a whole, and a mounting hole 12 is formed in the central portion thereof so as to penetrate through the upper and lower surfaces thereof. The mounting hole 12 is formed in such a size that a positioning shaft 53 formed in a lower insulating case 52 described later can be inserted therethrough. Further, the electrodes 13 and 1 are provided on the upper surface and the lower surface of the PTC element heating element 11, respectively.
4 are formed.

On the other hand, the upper feeding member 31 has the same number of circular flat plate portions 33a as the number of PTC element heating elements 11 and a long flat plate portion 34a connecting these circular flat plate portions 33a. Further, the lower power feeding member 32 has the same number of circular flat plate portions 33b as the number of PTC element heating elements 11 and a long flat plate portion 34b connecting the circular flat plate portions 33b. The circular flat plate portions 33a and 33b are formed to have a size substantially equal to the outer diameter of the PTC element heat generating body 11, and have mounting holes having substantially the same diameter as the mounting holes 12 of the PTC element heat generating body 11 at the center thereof. 35a and 35b are formed so as to penetrate therethrough.

The circular flat plate portion 33a of the upper power feeding member 31 contacts the electrode 13, the circular flat plate portion 33b of the lower power feeding member 32 contacts the electrode 14, and the PTC element heating element 11 is connected to the pair of power feeding members 31 and 32. It is pinched. Also,
Lead wires 36 and 37 to be connected to a commercial AC power supply (not shown) are connected to one ends of the power supply members 31 and 32, respectively. Therefore, the four PTC element heating elements 11
A voltage from an AC power supply is applied in parallel to the.

The cap 41 is for fixing the power supply members 31 and 32 to the electrodes 13 and 14 in contact with each other, and is integrally formed of a material having an electrical insulating property. The cap 41 has a space inside and an open lower surface so that the PTC element heating element 11 and the circular flat plate portions 33 of the power supply members 31 and 32 can be covered from above. On the upper surface of the cap 41, there is a P
Mounting hole 4 having substantially the same diameter as mounting hole 12 of TC element heating element 11
2 is formed through. Further, on the side surface of the cap 41, cutouts 43 and 44 into which the long flat plate portion 34a of the power feeding member 31 is fitted and cutouts 45 and 46 into which the long flat plate portion 34b of the power feeding member 32 are fitted are formed.

The electrodes 13 and 14 and the feeding members 31 and 3
The connection with 2 may be performed using an adhesive having conductivity. However, considering the time required for curing the adhesive and the labor for preventing the short circuit between the upper electrode 13 and the lower electrode 14 due to the liquid dripping of the adhesive, as described above, the cap 41 is not used without using the adhesive. By covering,
It is preferable to fix the power feeding members 31 and 32 to the electrodes 13 and 14, respectively.

The lower insulating case 52 is formed of a material having an electric insulating property, for example, by injection molding.
In the lower insulating case 52, the same number of positioning shafts 53 as the number of PTC element heating elements 11 are provided so as to project upward. The positioning shaft 53 uses the lower power supply member 32.
Mounting hole 35b, mounting hole 12 of PTC element heating element 11,
The upper power feeding member 31 and the cap 41 are inserted into the mounting hole 35a and the mounting hole 42 of the cap 41 in this order. Further, the rivet hole 5 into which the rivet 61 is inserted is inserted into the positioning shaft 53.
4 is formed through.

The upper insulating case 51 (see FIG. 2) is a PTC.
In a state where the element heating element 11 and the power supply members 31 and 32 are attached to the lower insulating case 52 and further covered with the cap 41, the element heating element 11 and the power feeding members 31 and 32 are set in an injection molding die to injection-mold an electrically insulating material. Is molded integrally with the lower insulating case 52. PTC element heating element 11, feeding members 31, 32 and feeding members 31, 32
The connecting portions between the lead wires 36 and 37 and the like are insulated and sealed by the upper insulating case 51 and the lower insulating case 52. Accordingly, the heater unit H has excellent waterproofness and can have high reliability even when used around water.

Upper insulating case 51 and lower insulating case 52
Has small heat shrinkage, heat resistance capable of withstanding thermal conductivity and mechanical strength, waterproofness that does not allow moisture to pass inside, and airtightness that does not allow air to pass inside, and the lead wire 3
It is necessary that the adhesion with the coating material of No. 6,37 is good. Therefore, it is preferable that the insulating cases 51 and 52 are formed of, for example, a polymer alloy made of nylon, polypropylene and glass fiber.

In addition, the upper insulating case 51 and the lower insulating case 5
It is desirable to form 2 and the same electrically insulating material from the viewpoint of integration because they have good affinity with each other and have the same thermal expansion coefficient. However, from the viewpoint of heat conduction,
It is preferable that the lower insulating case 52 conducts heat well to the heat transfer pieces 21 and 22, while the upper insulating case 51 does not easily dissipate heat. Therefore, when the latter viewpoint is prioritized, a material having both good thermal conductivity and electrical insulation, for example, a polymer alloy is used for the lower insulating case 52 while considering the mutual affinity and the coefficient of thermal expansion. For the upper insulating case 51, a material having a relatively low thermal conductivity, for example, an epoxy resin may be used.

The heater unit H as described above can be produced, for example, as follows. First, a flat cylindrical PTC element heating element 11 is created, and electrodes 13 and 14 are formed on the upper and lower surfaces thereof, respectively. For example, after applying the silver paste for forming the ohmic contact electrode, the PTC element heating element 11 is heated at 560 ° C. for 3 hours.
The electrodes 13 and 14 can be formed by heating for 0 minutes.

Next, the lower power feeding member 32, the PTC element heating element 11 and the upper power feeding member 31 are fitted in this order into the lower insulating case 52 which has been preformed by injection molding or the like. At this time, the PTC element heating element 11 is inserted so that the positioning shaft 53 formed in the lower insulating case 52 is inserted into the mounting hole 12 of the PTC element heating element 11 and the mounting holes 35a and 35b of the power feeding members 31 and 32. And the power feeding members 31 and 32 are arranged.

Then, the lead wires 36 and 37 are soldered to the one ends of the power supply members 31 and 32, respectively. The connection of the lead wires 36 and 37 may be performed before the power feeding members 31 and 32 are fitted into the lower insulating case 52. After that, the mounting hole 42 of the cap 41 is aligned with the position of the positioning shaft 53, and the upper power feeding member 31 is in the notches 43 and 44.
The cap 41 is covered so that the lower power feeding member 32 is fitted into the notches 45 and 46, respectively.

The lower insulating case 52 in which the above-mentioned members are arranged in this manner is set in an injection molding die, and a resin material for the upper insulating case 51 is injection molded to form the upper insulating case 5.
By forming 1, the upper insulating case 51 and the lower insulating case 52 are integrated, and the heater unit H is completed. The rivet holes 54 formed in the positioning shaft 53 are formed on the upper and lower surfaces of the heater unit H thus completed.
Are penetratingly formed as attachment holes when attaching the heater unit H to the heat transfer pieces 21 and 22.

A method of manufacturing the heater device 1 using the heater unit H thus completed will be described with reference to FIG.
Will be described with reference to. First, the heat transfer pieces 21 and 22 formed by, for example, convexly bending a stainless plate in accordance with the diameter of the pipe on which the heater device 1 is mounted are hinged 2.
Connect with 5, 26. Then, the heat transfer pieces 21, 2
A positioning hole 27 for positioning and mounting the heater unit H is formed in the hole 2. The number of positioning holes 27 to be formed is determined according to the number of heater units H and the number of PTC element heating elements 11 provided in one heater unit H.

Next, the heater unit H is arranged on the heat transfer pieces 21, 22 so that the rivet holes 54 formed in the heater unit H are aligned with the positioning holes 27 of the heat transfer pieces 21, 22. And the rivet 6 whose tip portion 61a is broken
The heater unit H is fixed to the heat transfer pieces 21 and 22 by inserting 1 into the rivet hole 54 and the positioning hole 27 and opening the tip portion 61a with a hammer or the like, and the heater device 1 is completed.

As described above, the heater unit H includes the PTC
Since the part where the element heating element 11 is present is riveted and fixed to the heat transfer pieces 21 and 22, the PTC
The element heating element 11 is pressed against the heat transfer pieces 21 and 22, and the heat generated by the PTC element heating element 11 is changed to the heat transfer piece 2
It is efficiently transmitted to 1 and 22. The heater unit H may be fixed by inserting a bolt into the rivet hole 54 and the positioning hole 27 and attaching a nut to the bolt from the heat transfer pieces 21 and 22 side. In addition, the heat transfer piece 21,
When 22 has a thickness of 3 mm or more, for example,
The heater unit H may be attached by forming screw holes in the heat transfer pieces 21 and 22 and screwing bolts into the screw holes. Of course, the heater unit H may be fixed to the heat transfer pieces 21 and 22 with an adhesive.

The heater device 1 produced as described above
Is attached to the pipe by rotating the heat transfer pieces 21 and 22 around the hinges 25 and 26 and winding them around the outer peripheral surface of the pipe, and tightening the heater device 1 with, for example, a binding band for binding electric wires. Therefore, the heater device 1 according to the present embodiment can be easily attached to an existing pipe.

When the heater device 1 is attached to a pipe and used, the outer surface of the heater device 1 is preferably covered with a heat insulating material in order to enhance the heating effect of the heater device 1. At this time, according to the heater device 1 of the present embodiment, since the heat generation does not occur above a certain temperature, there is no possibility that the heat insulation material will melt even if the heat insulation material directly contacts the heater unit H. Therefore, it is not necessary to perform special processing on the heat insulating material, and the cost and labor required for manufacturing can be reduced.

In the above embodiment, the heating element is PT
Since the thermistor element having C characteristics is used,
A device such as a thermostat is not required to control the heat generation temperature, and the initial cost of the device is reduced. Further, since the PTC element heating element 11 does not generate heat above a certain temperature, even if the PTC element heating element 11 is mounted on the outer peripheral surface of a pipe made of vinyl chloride, for example, the PTC element heating element 11 generates heat to melt or deform the pipe. There is no fear of doing it.

In the above-described embodiment, an example is given in which two heat transfer pieces each having a semicircular cross section when cut in a direction orthogonal to the axial direction of the pipe are joined by a hinge. As described above, three or more heat transfer pieces formed in an arc shape in cross section along the outer peripheral surface of the pipe may be hinge-connected to be externally attached to the pipe. Further, the heat transfer pieces are not necessarily connected to each other by the hinges, and the heat transfer pieces may be assembled so as to follow the shape of the pipe and attached to the pipe.

Further, in the above-mentioned embodiment, two heater units are attached to one heat transfer piece.
The number of heater units attached to one heat transfer piece is 1.
The number of books may be three or more. Furthermore, the number of PTC element heating elements provided in one heater unit is not limited to four, and may be one to three. Further, it may be five or more.

Next, a second embodiment of the present invention will be described. FIG. 5 is a perspective view showing the external configuration of the heater device according to the second embodiment of the present invention. 5, parts that are the same as the parts shown in FIG. 1 are given the same reference numerals, and descriptions thereof will be omitted. This heater device 70 is
A heat transfer plate 71 made of a thin metal plate (for example, 0.25 mm in thickness) that has excellent thermal conductivity and can be easily bent, and a plurality of heater units H attached to one surface of the heat transfer plate 71. It has and. The heat transfer plate 71 is formed in a size capable of covering the outer circumference of the pipe 92 to which the heater device 70 is attached.

When the heater device 70 is attached to the pipe 92, the heat transfer plate 71 is curved along the shape of the pipe 92 so that the surface on which the heater unit H is attached is on the outside, and the pipe 92 is attached. Wrap around the outer peripheral surface of.
Then, the heater device 70 is fixed to the pipe 92 by tightening the heater device 70 with the binding band 74 for binding the electric wires.

The heat generated by the heater unit H causes piping 92
The outer surfaces of the heater unit H and the heat transfer plate 71 are preferably covered with two heat insulating materials 72 and 73 so that the heat can be efficiently heated. The heat insulating materials 72 and 73 are made of, for example, a semi-cylindrical heat insulating material piece formed of a synthetic resin foam molded body so that the two heat insulating material pieces can match the cylindrical shape. It is produced by molding the molded product into two and dividing the molded product into two in the length direction. The heat insulating materials 72 and 73 are attached so as to form a cylinder that covers the outer surface of the heat transfer plate 71, and, for example, an adhesive tape made of vinyl chloride is wound and fixed on the outer peripheral surface thereof. Note that the two pieces of heat insulating material may be openably and closably connected by, for example, a hinge so as to match the cylindrical shape.

As described above, since the heat transfer plate 71 is made of a flexible material, the heater device 70 is connected to the pipe 92.
Can be easily attached to. Further, the heat transfer plate 71 is
The heater device 70 can be attached to pipes of any shape because it can be bent according to the shape of the pipes to be attached when attached to the pipes. Furthermore, the heat transfer plate 71
Is a thin plate, the heater device 70 is not bulky and is convenient for transportation. In addition, the same operational effects as those of the above-described first embodiment can be obtained.

FIG. 6 shows a heater device according to the third embodiment of the present invention. 6, parts that are the same as the parts shown in FIG. 1 or FIG. 5 are given the same reference numerals, and descriptions thereof will be omitted. The heater device 80 includes a plurality of convex portions 7 at one end of a flexible heat transfer plate 71 for bending.
5 is formed, and the same number of concave portions 76 as the convex portions 75 are formed at the other end. The heater device 80 is fixed to the outer peripheral surface of the pipe by being wound around the outer peripheral surface of the pipe so that the heater unit H is on the outer side and fitting the convex portion 75 into the concave portion 76. Therefore, according to this configuration,
No binding band or the like is required to fix the heater device 70 to the pipe.

In addition to the heater device 80 shown in FIG. 6, a heater device shown in FIG. 7 can be used as the heater device capable of maintaining the wound state around the pipe without using a separate member such as a binding band. 81 can be illustrated. The heater device 81 includes a plurality of protrusions 7 on one end of the heat transfer plate 71.
7 are formed, and the same number of elongated holes 78 as the convex portions 77 are formed near the other end. Replace the heat transfer plate 71 with the heater unit H.
Wrap around the outer peripheral surface of the pipe so that the
7 is inserted into the long hole 78 (see FIG. 8A), and the convex portion 77 is folded back to the front side, so that the heater device 8
1 is attached to the pipe (see FIG. 8B).

As shown in FIG. 8A, the protrusion 77
The front side of the elongated hole 78 with respect to the insertion direction is pushed out to the heater mounting surface side so that the protrusion 77 can be easily inserted into the elongated hole 78. As a result, the protrusion 78 can be easily inserted into the elongated hole 78, and when the heater device 81 is attached to the pipe, the protrusion 77 and the heat transfer plate 7 are provided on the lower surface side in FIG.
1 is substantially flush with each other, and the heat transfer plate 71 is in close contact with the outer peripheral surface of the pipe.

In the above three embodiments, the front and back surfaces of the heat transfer piece and the heat transfer plate are smooth. However, as shown in FIG. 12, the disc portion 6 of the heater unit H is
It is preferable that the portion in contact with 2 (see FIG. 1) is extruded toward the heater mounting surface side by embossing to form a circular flat portion 7, for example. Because, as shown in FIG. 13, if the plane portion 7 is formed,
This is because the disk portion 62 of the heater unit H is in close contact with the flat surface portion 7 and the heating efficiency of the heater unit H is improved.
Further, when the heater unit H is fixed to the heat transfer piece or the heat transfer plate by the rivet 61, the tip portion 61a such as a rivet is housed in the space formed in the flat portion 7,
This is because the adhesion between the heat transfer piece and the heat transfer plate and the pipe 92 can be improved.

Note that, as shown in FIG. 14, the entire portion to which the heater unit is attached may be extruded toward the heater attachment surface side to form the flat rectangular extrusion portion 8. Although three embodiments of the present invention have been described, the present invention can be embodied in forms other than these embodiments. For example, in each of the above-described embodiments, the heater device mounted on the outer peripheral surface of the pipe has been described, but the heat transfer piece or the heat transfer plate is integrally provided on the outer surface of the pipe,
It may be a pipe with a heater. The heater-equipped pipe may be formed, for example, by forming a heat transfer layer by plating stainless steel or the like on the surface of the pipe and mounting the heater unit on the outer surface of the heat transfer layer. At this time,
The heater unit is adhered and fixed with, for example, an adhesive, or is tightened and fixed with a binding band. By arranging the heater-equipped pipe configured as described above at the time of construction of a building or the like, it is not necessary to retrofit a heater device for keeping the temperature of the pipe. Further, if the heater-equipped pipe is preliminarily covered with a heat insulating material, the pipe will have a high heating efficiency and the labor of mounting the heat insulating material after the piping can be saved.

As the material of the heat transfer piece, the heat transfer plate or the heat transfer layer, metals such as aluminum, iron and nickel can be used in addition to stainless steel. In addition to metals, substances such as aluminum oxide, aluminum nitride, silicon carbide and silicon nitride can be used as the material. In addition to this, various modifications can be made within the scope described in the claims.

[0061]

According to the first aspect of the present invention, the heat generated from the heater unit keeps the pipe warm, so that, for example, freezing of water inside the pipe can be prevented. Further, since a device such as a thermistor for temperature control is not required, the initial cost of the device can be reduced. Further, the piping is not abnormally overheated by the heat generated from the heater unit, and there is no possibility that the piping melts. Furthermore, metal rivets or
Or a portion that penetrates the heat transfer member of the bolt and projects toward the piping side
Is a recess (transmission) formed by forming the heater mounting part.
Concave created on the heat transfer surface side by partially extruding the heat plate
Part) to prevent the heat transfer surface from sticking to the piping surface.
There is no danger of being jealous. Therefore, the piping is efficient
Can be heated.

Furthermore, since the heater unit itself has excellent waterproofness, even if this heater device is used around water, it can have high reliability. Moreover, this heater device can be attached to an existing pipe, which is convenient. According to the second aspect of the invention, the surface of the pipe can be covered with the entire heat transfer member by connecting the plurality of heat transfer pieces, so that the pipe can be easily attached to the existing pipe. In addition, since the size of each heat transfer piece can be reduced, it is convenient to handle.

According to the third aspect of the invention, since the plurality of heat transfer pieces are connected in advance by the hinge member,
The time and effort required to assemble the pipe along the outer peripheral surface are reduced. According to the invention of claim 4, the heat transfer member can be deformed into a shape along the shape of the pipe, so that the heat transfer member can be easily attached to the pipe. Further, since the heat transfer member can be brought into close contact with the pipe, the heat generated from the heater unit is efficiently transferred.

According to the fifth aspect of the present invention, since the heater unit is preliminarily attached to the pipe, by incorporating this pipe at the time of construction of a building or the like, it is not necessary to retrofit the heater device. According to the invention of claim 6, since the outer surface of the pipe to which the heater unit is attached is covered with the heat insulating member, the heating efficiency can be improved.

[Brief description of drawings]

FIG. 1 is a diagram of a heater device according to an embodiment of the present invention as seen obliquely from above.

FIG. 2 is a cross-sectional view of the heater device taken along section line II-II in FIG.

FIG. 3 is an exploded perspective view showing a configuration of a heater unit.

FIG. 4 is an enlarged perspective view showing the heater device in an exploded manner in order to explain a method of manufacturing the heater device.

FIG. 5 is a diagram showing a configuration of a heater device according to a second embodiment of the present invention.

FIG. 6 is a diagram showing a configuration of a heater device according to a third embodiment of the present invention.

7 is a plan view showing a modified example of the heater device shown in FIG.

FIG. 8 is a perspective view showing, in an enlarged manner, a convex portion and an elongated hole in order to explain a method of mounting the heater device shown in FIG. 7 on a pipe.

FIG. 9 is a plan view showing a simplified connection state of heater units.

FIG. 10 is a plan view showing an example of a heater unit connection method.

FIG. 11 is a plan view showing another example of the method for connecting the heater units.

FIG. 12 is a view showing a modified example of the heat transfer piece and the heat transfer plate.

FIG. 13 is a diagram for explaining an effect when the heat transfer piece and the heat transfer plate shown in FIG. 12 are used.

FIG. 14 is a diagram showing another modification of the heat transfer piece and the heat transfer plate.

FIG. 15 is a cross-sectional view showing a simplified piping state of piping connected to a roof drain.

FIG. 16 is a view of a conventional pipe with a heater as seen obliquely from above.

[Explanation of symbols]

1,70,80,81 heater device 11 PTC element heating element 21,22,71 heat transfer plate 25,26 hinge 51,52 Insulation case 72,73 insulation 92 Piping H1 to H4 heater unit

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-8-41936 (JP, A) JP-A-7-331708 (JP, A) Actually open 7-8460 (JP, U) Actually open 3- 108068 (JP, U) Actual development Sho 57-51770 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) E03B 7/12 F16L 53/00 H05B 3/40

Claims (6)

(57) [Claims] 1. A heater device arranged on the surface of a synthetic resin pipe to keep the temperature of the pipe warm, the surface facing the surface of the pipe being used for heat transfer to the pipe.
The heat transfer plate used as the heat transfer surface of
Heater formed by extruding to the side opposite to the heat transfer surface.
For insulating the heat transfer member that has a mounting part and the positive temperature coefficient thermistor element with synthetic resin.
Therefore, it has a through hole for fixing,
Use a metal rivet or bolt inserted through the through hole
By passing through the heater mounting part and fixing it,
A heater device, comprising: a heater unit attached to a heater attachment portion . 2. The heat transfer member includes a plurality of heat transfer pieces formed in an arc shape along the surface of the pipe, and the plurality of heat transfer pieces are combined to cover the surface of the pipe. The heater device according to claim 1, wherein the heater device is a heater. 3. The heater device according to claim 2, wherein the heat transfer member includes a hinge member that hinge-connects the plurality of heat transfer pieces to each other. 4. The heater device according to claim 1, wherein the heat transfer member is a flexible plate-like member that can be deformed along the outer peripheral surface of the pipe. 5. A pipe made of synthetic resin and a surface facing the surface of the pipe for heat transfer to the pipe.
The heat transfer plate used as the heat transfer surface of
Heater formed by extruding to the side opposite to the heat transfer surface.
For insulating the heat transfer member that has a mounting part and the positive temperature coefficient thermistor element with synthetic resin.
Therefore, it has a through hole for fixing,
It was inserted through the through-hole metal rivets or bolts to the
By passing through the heater mounting part and fixing it,
A heater-equipped pipe including a heater unit attached to a heater attachment portion . 6. The pipe with a heater according to claim 5, further comprising a heat insulating member that covers the pipe.