JP2011187281A - Piping heating device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a piping heating device using an electric energy for heating, from an outer circumferential side of a piping, a fluid flowing in piping having accessory items having a larger diameter than that of the piping such as a joint, a connection part of branch piping, a connection part of a valve or the like, in which the piping and the accessory items can be arranged easily and the piping can be heated uniformly and efficiently and moreover a cost for installation is inexpensive. <P>SOLUTION: The piping heating device is provided a planar heater of which the a center-side surface is covered with a metal layer and a metal-made heat conductive member which extends toward a central part from the surface of the metal layer and is so arranged as to pinch and contact the piping, inside a heat insulating material having a cylindrical shape capable of surrounding an accessory item and the piping of a prescribed section. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a heating apparatus that uses electrical energy to heat a fluid that flows mainly in a cylindrical pipe. More specifically, the present invention relates to a heating device for efficiently heating a fluid flowing in a pipe having accessories such as a joint and a valve.

  2. Description of the Related Art Conventionally, planar heaters that are attached to the outer surfaces of various pipes and the like and heat fluid flowing through the pipes have been widely used. As a form of such a heater, for example, as shown in JP-A-11-74066 and JP-A-2004-158271, a tape-like heater wound around the outer circumference of a pipe, JP 2000-505582A, is disclosed. As shown in Japanese Laid-Open Patent Publication Nos. 2002-295883 and 2002-352941, jacket heaters in which a heating element and a heat insulating material are integrated have been developed.

  In addition, as a heating element used in the planar heater as described above, a glass cloth is impregnated using a synthetic resin (conductive resin) containing graft carbon, carbon powder, metal powder, or metal oxide powder. Ingredients, those obtained by applying or printing a conductive resin such as the above to an insulating base sheet such as polyester, polyimide, mica, etc., those obtained by etching a metal foil into a circuit, or insulating metal resistance wires Examples include a circuit formed on a substrate sheet.

Japanese Patent Laid-Open No. 11-74066 Special table 2000-505582 JP 2002-295883 A Japanese Patent Laid-Open No. 2002-352941 JP 2004-158271 A

  However, when the pipe to be heated is equipped with an accessory having a diameter larger than the diameter of the pipe, such as a joint, a branch pipe connection part, or a valve connection part, a conventional tape heater or jacket heater is used. Various problems occurred when used. For example, when a tape-shaped heater is used, there are inconveniences that it takes time to wind around these pipes and accessories, and it is difficult to attach them so that the temperature distribution is uniform. In addition, if a large jacket heater is used to heat the piping and accessories together, there will be a gap between the heater and the piping where there are no accessories. There was an inconvenience that the temperature rate was slow. Furthermore, if the pipes and accessories are to be heated separately, a plurality of complicatedly shaped heaters must be prepared, which is inconvenient and expensive.

  Therefore, the problem to be solved by the present invention is that an electric fluid for heating the fluid flowing through the inside of a pipe provided with accessories such as a joint, a branch pipe connection part, and a valve connection part from the outer peripheral side of the pipe. Provided is a heating device that uses energy, can be easily arranged on pipes and accessories, can heat pipes uniformly and efficiently, and is low in installation cost. That is.

  As a result of intensive studies to solve these problems, the present inventors have found that a relatively large heat insulating material capable of surrounding accessories and piping in a predetermined section is covered with a metal layer. The metal heater is fixed to the metal layer so that the central heater is disposed so that the center side is a metal layer, and further extends from the surface of the metal layer toward the center, and sandwiches and contacts the pipe. If it arrange | positions, it discovered that the heat | fever from a planar heater would be easily and uniformly transmitted to piping via a metal layer and a metal heat-transfer member, and arrived at the heating apparatus of the piping of this invention.

  That is, the present invention is a heating device for heating a pipe having an accessory having a diameter larger than the diameter of the pipe to be heated, and can surround the accessory and the pipe in a predetermined section. In a heat insulating material having a cylindrical shape, a planar heater whose center side surface is coated with a metal layer, and a surface extending from the surface of the metal layer toward the center, is arranged so as to sandwich and contact the pipe. A pipe heating apparatus comprising a metal heat transfer member.

  The pipe heating device of the present invention is configured so that an accessory having a diameter larger than the diameter of the pipe to be heated can be heated together with the pipe with one heating device, so installation is not troublesome and installation In this case, the cost is also low. In addition, since a metal heat transfer member that contacts the metal layer and the pipe is arranged on the surface of the planar heater, heat from the planar heater is easily transferred to the pipe via these members, and the pipe is It can heat uniformly and efficiently.

The pipe heating device of the present invention heats a fluid flowing through a pipe having an accessory having a diameter larger than the diameter of the pipe to be heated, such as a joint, a branch pipe connection, and a valve connection. Therefore, it is applied to a heating device using electric energy.
Hereinafter, although the heating apparatus of piping of this invention is demonstrated based on FIGS. 1-9, this invention is not limited by this.

  FIG. 1 is a perspective view of an upper incision showing an example of a pipe heating apparatus of the present invention. FIG. 2 is a cross-sectional view showing an example of a pipe heating apparatus of the present invention. FIG. 3 is a perspective view showing an example of a part of the heat insulating material used in the present invention (without an electrode insertion portion). FIG. 4 is a perspective view showing an example of the configuration of a planar heater, a metal layer, and a metal heat transfer member used in the present invention. FIG. 5 is a perspective view showing an example of a part of the heat insulating material used in the present invention (with an electrode insertion portion). FIG. 6 is a cross-sectional view showing an example of the configuration of the planar heater, the metal layer, and the metal heat transfer member other than that shown in FIG. 4 used in the present invention. FIG. 7 is a cross-sectional view showing an example other than FIG. 2 of the pipe heating device of the present invention. FIG. 8 is a configuration diagram of a pipe provided with a joint. FIG. 9 is a configuration diagram of a pipe provided with a connection portion of a valve (branch pipe).

  The pipe heating apparatus of the present invention is an accessory having a diameter larger than the diameter of the pipe to be heated, for example, a joint 9 as shown in FIG. 8, and a connecting portion 10 of a valve 11 (branch pipe) as shown in FIG. As shown in FIGS. 1 and 2, a heating device for heating a pipe 8 having a cylindrical shape that can surround the accessory and the pipe in a predetermined section. The sheet heater 3 whose center side surface is covered with the metal layer 2 and the surface of the metal layer 2 are fixed inside, and extends toward the center, and is arranged so as to be in contact with the piping. It is a heating device for a pipe provided with a metal heat transfer member 4.

  FIG. 1 is a perspective view of an upper incision in which the portion of the heat insulating material having the electrode insertion portion 7 of FIG. 5 is removed in the pipe heating apparatus of the present invention. The pipe heating apparatus of the present invention is shown in FIG. It is a heating apparatus formed by disposing one component part of the heating device in which an electrode is inserted into the electrode attachment portion 7 of the heat insulating material in FIG. 5 above the one component part of the heating device as shown in FIG.

  The heat insulating material in the heating device of the present invention is a heat insulating material having a cylindrical shape (cylindrical, elliptical cylinder, square cylinder, polygonal cylinder) having an inner diameter larger than that of the accessory. It is also possible to form a disk shape having holes that allow pipes to pass through. In addition, the cylindrical heat insulating material may have the outer peripheral shape and the inner peripheral shape of the cross section perpendicular to the longitudinal direction as shown in FIG. 7, or as shown in FIG. Also good. Further, the heat insulating material in the heating device of the present invention may be a heat insulating material made of a single molded body having a cylindrical shape, but as shown in FIGS. It is also possible to divide into four parts and to combine them by a connecting means such as a band.

  The constituent material of the heat insulating material in the present invention is not particularly limited as long as it can withstand the heating temperature of the heater and has heat insulating properties. For example, silicone resin, Teflon (registered trademark) resin, polyolefin resin, Polyester resin, vinyl chloride resin, polyimide resin and the like can be mentioned, and among these, silicone resin is preferable. Moreover, the thickness of a heat insulating material is 1-50 mm normally, Preferably it is 2-20 mm. When the thickness is less than 1 mm, the heat insulating properties deteriorate, and when the thickness exceeds 50 mm, the effect of improving the heat insulating properties decreases and the heating device becomes large.

The planar heater used in the present invention is usually a planar heater in which both sides of a heat generating element are covered with an insulating resin sheet, but may or may not have flexibility and flexibility.
Examples of the heating element include a metal foil resistor, metal wire resistor, or at least one selected from graft carbon, carbon powder, metal powder, and metal oxide powder formed into a desired pattern, such as a silicone resin. A resistor or the like obtained by impregnating a base material such as glass fiber or ceramic fiber with a conductive resin kneaded with a heat-resistant resin can be used. The thickness of such a heating element is usually 0.01 to 0.5 mm, preferably 0.05 to 0.1 mm. When the thickness is less than 0.01 mm, the strength is weak, and when it exceeds 0.5 mm, flexibility and softness may be lost.

  Further, the insulating resin sheet is not particularly limited as long as it has electrical insulation with a predetermined thickness. For example, silicone resin, Teflon (registered trademark) resin, polyolefin resin, polyester resin, vinyl chloride resin, polyimide resin Of these, silicone resins are preferred. The thickness of the insulating resin sheet is usually 0.5 to 10 mm, preferably 1 to 5 mm. When the thickness is less than 0.5 mm, the electrical insulation properties deteriorate, and when the thickness exceeds 10 mm, flexibility may be lost.

  In the heating device of the present invention, the metal layer is coated on the center side surface of the planar heater as described above. As the metal layer, a metal foil or a metal plate having a thickness of 0.01 to 3 mm is usually used, and preferably a metal foil or a metal plate having a thickness of 0.05 to 2 mm is used. Examples of the metal material include iron, copper, aluminum, and an alloy. The metal layer can be coated with a far-infrared paint on the center side surface thereof to improve the heating efficiency of the piping and the uniformity of the temperature due to the radiation of the far-infrared rays.

  In the heating device of the present invention, a metal heat transfer member is further disposed on the center side surface of the metal layer. As shown in FIGS. 2, 6 (2) and 4 (4), the metal heat transfer member has a root portion 6 formed of one or two metal pillars, and the tip portions 5 spread from each other. As shown in FIG. 6 (1), the base portion 6 is composed of one or two metal pillars, and the tip portion 5 faces each other, as shown in FIG. 6 (1). Metal heat transfer member made of two semicircular metal plates, as shown in FIG. 6 (3), a plurality of metal heat transfer members set so that the pipe can be clamped by the tip portion (convex portion) Etc. can be illustrated. In addition, a metal heat transfer member can also be formed by punching a part of the metal layer and bending it.

Examples of the constituent material of the metal heat transfer member include iron, copper, aluminum, alloy, etc., but at least the tip portion 5 is provided with elasticity to widen the diameter range of the pipe that can be held. It is preferable that Such a metal heat transfer member is arranged so that the tip portion 5 contacts the pipe 8 of the portion not provided with the accessory.
In the present invention, the arrangement of the planar heater, the metal layer, and the metal heat transfer member on the heat insulating material is illustrated by, for example, arranging the constituent materials as shown in FIG. 4 on the heat insulating material as shown in FIG. After assembling the structure as shown in FIG. 1, a heat insulating material having a structure as shown in FIG. 5 may be arranged and integrated.

  If the surface heater is arranged on the entire surface of the inner wall surface of the heat insulating material, the heating efficiency to the pipe is improved. However, depending on the structure of the pipe and accessories, it may be difficult to attach the pipe to the pipe. As shown in FIG. 6, it can also arrange | position to a part (a cross section is U shape) of the cylinder inner wall surface of a heat insulating material. Similarly, the metal layer can be entirely or partially covered on the center side surface of the planar heater. Examples of the form of the planar heater and the metal layer include a plate shape, a cylindrical shape, a rectangular tube shape, a cylindrical shape having a slit in the longitudinal direction, and a rectangular tube shape. The heat insulating material, the planar heater, the metal layer, and the metal heat transfer member are usually fixed so as not to move easily.

  EXAMPLES Next, although an Example demonstrates this invention concretely, this invention is not limited by these.

[Example 1]
(Manufacture of heater components)
A metal resistance wire is wired on an unvulcanized silicone resin insulation sheet having a length of 3.5 cm, a width of 30.0 cm, and a thickness of 0.8 mm, and a silicone resin insulation sheet similar to the above is overlaid thereon, After hot pressing at 180 ° C. for 30 minutes, the plate was left in a furnace at 200 ° C. for 2 hours to be completely cured to produce three flexible planar heaters. Next, these planar heaters were formed into a U-shaped metal layer (cross section: 3) consisting of three metal plates having a length of 3.5 cm, a width of 30.0 cm, and a thickness of 2.0 mm coated with far-infrared paint. (5 cm × 3.5 cm, length: 30.0 cm) were molded integrally by adhesion. At two predetermined positions of the metal plate, a metal heat transfer member made of two metal plates having a shape in which the base portion is composed of two metal pillars and the tip portions are spread out to each other is attached to FIG. A heater constituent member having the structure shown was obtained.

(Production of piping heating equipment)
An insulating sheet made of a silicone resin, a silicone sponge sheet, and an insulating sheet made of a silicone resin are wound around a rectangular stainless steel pipe having a cross-sectional outer shape having the same dimensions as those of the U-shaped heater constituting member, and 200 ° C. After being left to stand in the furnace for 2 hours to be completely cured, the stainless steel pipe was removed and formed into a square tube having a thickness of 12.0 mm to obtain a heat insulating member. Furthermore, it halved in the longitudinal direction, a cavity for attaching the electrode was provided on one side, and the electrode was inserted. By combining this heat insulating member and the above-mentioned U-shaped heater component, a square tube heating apparatus having a quadrangular outer shape in FIG. 2 was obtained.

(Heating test)
The heating structure obtained as described above is connected to a pipe provided with a valve connection part and a joint as shown in FIG. 9, and the metal heat transfer member contacts the pipe between the valve connection part and the joint. It was attached as follows. At that time, it was easy to mount without taking time and effort. Next, a rated voltage of 100 V was applied (target: 150 ° C.), and the surface temperature of the connection portion of the valve after 1 hour was measured. As a result, the surface temperature of the connection portion of the valve portion reached 150 ° C.

[Example 2]
In the manufacture of the heater constituent member of Example 1, a heater constituent member was manufactured in the same manner as in Example 1 except that the metal heat transfer member was replaced with a metal heat transfer member as shown in FIG. After installing a heat insulating member and manufacturing a pipe heating device in the same manner as in Example 1, a heating test was performed by applying a rated voltage of 100 V in the same manner as in Example 1. As a result, connection of valves after 1 hour had elapsed The surface temperature of the part reached 150 ° C.

[Example 3]
In the manufacture of the heater component of Example 1, the heater component was manufactured in the same manner as in Example 1 except that the metal heat transfer member was replaced with a metal heat transfer member as shown in FIG. After installing a heat insulating member and manufacturing a pipe heating device in the same manner as in Example 1, a heating test was performed by applying a rated voltage of 100 V in the same manner as in Example 1. As a result, connection of valves after 1 hour had elapsed The surface temperature of the part reached 150 ° C.

[Comparative Example 1]
In the production of the heater constituent member of Example 1, a heater constituent member was produced in the same manner as in Example 1 except that the metal heat transfer member was not attached. After installing a heat insulating member and manufacturing a pipe heating device in the same manner as in Example 1, a heating test was performed by applying a rated voltage of 100 V in the same manner as in Example 1. As a result, connection of valves after 1 hour had elapsed The surface temperature of the part increased only to 105 ° C. and did not reach the target of 150 ° C.

  As in the above-described embodiments, the piping heating device of the present invention does not require time and effort for installation, and heat from the planar heater is easily transferred to the piping via the metal heat transfer member, so that the piping is uniform. It was confirmed that it can be heated efficiently.

The perspective view of the upper incision which shows an example of the heating apparatus of piping of this invention Sectional drawing which shows an example of the heating apparatus of piping of this invention The perspective view which shows an example of a part of heat insulating material used for this invention (no electrode insertion part) The perspective view which shows an example of a structure of the planar heater used for this invention, a metal layer, and a metal heat-transfer member. The perspective view which shows an example of some heat insulation materials (with an electrode insertion part) used for this invention Sectional drawing which shows the example of a structure of planar heaters, metal layers, and metal heat-transfer members other than FIG. 4 used for this invention. Sectional drawing which shows an example other than FIG. 2 of the heating apparatus of piping of this invention Configuration diagram of piping with joints Configuration diagram of piping with valve (branch) connection

DESCRIPTION OF SYMBOLS 1 Heat insulating material 2 Metal layer 3 Planar heater 4 Metal heat transfer member 5 The tip part of metal heat transfer member 6 The base part of metal heat transfer member 7 Electrode insertion part 8 Piping 9 Joint 10 Connection part 11 Valve

Claims (10)

  A heating device for heating a pipe provided with an accessory having a diameter larger than the diameter of the pipe to be heated, and having a cylindrical shape capable of surrounding the accessory and the pipe in a predetermined section A planar heater whose center side surface is covered with a metal layer inside the heat insulating material, and a metal heat transfer that extends from the surface of the metal layer toward the center and is in contact with the pipes A piping heating device comprising a member.   The pipe heating apparatus according to claim 1, wherein the accessory having a diameter larger than the diameter of the pipe to be heated is a joint, a branch pipe connection, or a valve connection.   The heating apparatus for piping according to claim 1, wherein a far-infrared paint is applied to the surface of the metal layer.   2. The piping heating device according to claim 1, wherein the metal heat transfer member is composed of two metal plates having a shape in which the base portion is composed of one or two metal pillars and the tip portions are expanded from each other.   The heating of piping according to claim 1, wherein the metal heat transfer member is composed of two semicircular metal plates whose root portion is composed of one or two metal columns and whose tip portions are opposed to each other. apparatus.   The pipe heating device according to claim 1, wherein a plurality of metal heat transfer members are arranged so that the metal heat transfer members can sandwich the pipe.   The pipe heating device according to claim 1, wherein the metal heat transfer member is formed by punching a part of the metal layer and bending the metal layer.   The heating apparatus for piping according to claim 1, wherein the metal heat transfer member is fixed to the metal layer by welding, a screw / nut, or an adhesive.   The heating device for piping according to claim 1, wherein the heating element of the planar heater is a metal foil resistor or a metal wire resistor.   The heating device for piping according to claim 1, wherein the heating element of the planar heater is a resistor in which at least one selected from graft carbon, carbon powder, metal powder, and metal oxide powder is kneaded with a heat-resistant resin.

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