JPS61218894A - Piping heat-insulating heater - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a pipe heat-retaining heater for maintaining a constant pipe temperature or preventing freezing in a fluid transfer pipe.

[Conventional technology]

When a fluid, generally a liquid, is transferred through piping, it may be required to maintain the liquid piping at a constant temperature.

On the other hand, in cold regions, when the pipe temperature decreases due to a drop in outside air temperature, and fluid is transferred through the pipe, it is impossible to maintain the pipe temperature constant even if a heat insulating cover is attached to the pipe.

Furthermore, if the fluid is tap water, the pipes may burst due to freezing. In order to prevent this freezing, a conventional method has been to wrap a linear or band-shaped heating element in a spiral between the outer periphery of the piping and the insulation cover, and use this heating element to heat the piping and prevent it from freezing. has been done. This method can also be applied when maintaining the pipe temperature constant.

However, when winding a conventional linear or band-shaped heating element around a pipe in a spiral manner, there is a risk of double winding. Also, if the heating element is not wrapped closely around the pipe, its heating effect will be reduced.1 For example, when wrapping several meters of pipe KIO,
It becomes necessary to wrap it while preventing loosening using vinyl tape or the like.

In such winding, winding may be difficult due to other obstacles, or due to lack of electrical knowledge of the operator, a conductor such as wire may be used to prevent loosening. The double-wound portion and the wire-based loosening prevention portion may become electrically short-circuited, causing abnormal heat generation in those portions and causing a fire.

Thermal covers used to block out cold outside temperatures are generally made of styrofoam material, which is resistant to low temperatures but weak against high temperatures and can cause fires, due to its heat retention effect and economic efficiency. be.

In addition, the conventional heating element described above generates heat due to the electrical resistance of a metal resistor such as a nichrome wire, and generates a predetermined amount of heat depending on a specific length of the nichrome wire. must be used at specified winding intervals to prevent abnormal heat generation. Therefore, due to the length of the piping, even if the heating element has an extra length, it cannot be cut, and therefore the heating element is wrapped tightly around the piping, causing abnormal heat generation. Furthermore, even if the length of the heating element is insufficient for the piping, it is impossible to add more because the desired heat generation cannot be obtained due to changes in electrical resistance, which is inconvenient in actual construction.

In order to solve the above problem, the applicant (inventor) of the present invention invented a heat-generating heater and filed an application (application number undecided, 1985).
(filed on August 8, 2016). The heat-generating heat-retaining heater consists of an inner cylinder made of an elastic, electrically insulating and waterproof thin sheet material with openings formed over the entire length of the cylinder, and a longitudinal-direction tube attached to the outer periphery of the inner cylinder. A heat generating part consisting of two parallel conductive wires extending from one side to the other, and a flat or linear heating element electrically connected in parallel with an interval between the two parallel conductors; This heat-generating heater is characterized by comprising an outer cylinder made of an electrically insulating and waterproof thin sheet that is adhered to the outer periphery of the inner cylinder.

[Problem that the invention seeks to solve]

As mentioned above, the conventional means for keeping pipes warm and preventing water pipes from freezing has a structure in which a linear or band-shaped metal resistance heating element is spirally wrapped around the pipes and a heat-insulating cover. There is a risk of a fire accident, and there is also a restriction that cutting and joining cannot be done depending on the usage conditions, which is inconvenient.

On the other hand, although the heat-generating heat-retaining heater proposed by the applicant of the present invention can solve most of the drawbacks of using the conventional linear or band-shaped metal resistance heating element, it still has problems in manufacturing, use, and construction. It cannot be said that the issue has been completely resolved.

The present invention solves the above problems, completely prevents the occurrence of fire accidents due to abnormal heat generation, allows for free cutting and addition during construction, is extremely easy and simple to install on piping, and is easy to manufacture. The object of the present invention is to provide a pipe heat-retaining heater that solves various problems in use and construction.

[Means for solving problems]

The means of the present invention for solving the above-mentioned problems includes an outer cylinder made of an elastic, electrically insulating and waterproof thin sheet material in which an opening is formed over the entire length of the cylinder, and the outer cylinder. a heat generating part consisting of two parallel conducting wires extending in the longitudinal direction attached to the inner periphery of the heating element and a flat heating element electrically coupled between the two parallel conducting wires; The inner cylinder is made of an electrically insulating and waterproof thick sheet that is adhered to the inner periphery of the outer cylinder, and the connecting terminals at both ends of two parallel conductors are connected to the inner and outer sides. A pipe heat insulating heater characterized in that the device is fixed between a tube and a tube, and the inner diameter of the inner tube is 101 to 80 inches smaller than the outer diameter of the tube to be held, and the inner diameter is perpendicular to the longitudinal direction. It can be cut and used by connecting it in the longitudinal direction, and it is also equipped with a pipe temperature sensor, a power source, and a means to confirm electricity. They are connected by a connecting member.

〔Example〕

Next, the present invention will be explained with reference to drawings showing examples. Figures 1.2 and 3 are a perspective view, a developed view, and a sectional view of an embodiment of the present invention, respectively, and in these figures, the pipe insulation heater 1 of the present invention has a cylindrical opening extending over the entire length. The inner cylinder 2, on which the part 2a is formed, is made of a thick elastic sheet that is electrically insulating and waterproof, and the outer cylinder 2 is made of a sheet made of the same material as the inner cylinder 2, but thinner than the inner cylinder 2, and is made into a flat state on the inner surface. The heat generating part 3 and the two parallel conductive wires 8a are adhesively fixed, followed by the formation of the inner cylinder 2, and crimped and pasted in correspondence with the opening 2a. There are two conductive wires 3a in the heat generating part 3.
+ 9 a' are arranged in parallel and extending in the longitudinal direction at intervals, and one flat heating element 8b is electrically coupled between the conductive wires 8 a * 8 a'.

The heating element 8b has a planar shape such as a carbon fiber nonwoven fabric, and is connected to the conductive wire 8a*3a' over its entire length except for the upper and lower ends. Female connection terminals 8c, 8c' are attached to the upper ends of the conductor wires 8a, 8a', and male connection terminals 8d, 3d' are attached to the lower ends, respectively. The heat generating part 3 is arranged so as not to cover the opening 2a. Female connection terminal 3
C* 8 C' is covered and fixed with the inner tube 2 and the outer tube 4 up to the vicinity of the tip. The male connection terminals 3 d and 8 d', except for their bases, protrude from the ends of the inner and outer cylinders 2.4.

The inner diameter of the inner cylinder 2 is approximately 10 to SOS smaller than the outer diameter of the pipe it holds.
Formed small. If this is less than 10%, it will easily slip off when holding the pipe.If it exceeds 30%, the heat retention effect will be poor.

FIG. 4 is a perspective view for explaining the connection state of the two piping insulation heaters 1.1, in which the male connection terminals ad and ad' of the upper piping insulation heater l are connected to the female connection terminals of the lower insulation heater 1. Insert into the terminals 3c and 3c' and electrically generate the heat generating part 3.
．． 3 is connected, and the connected portion is covered with an electrically insulating and waterproof cover 10. The structure of the cover IO will be described later.

FIGS. 5(a), (b), and (c) are partially removed perspective views of an embodiment of the connection state between the piping insulation heater 1.1 and the power supply unit 20, and (a) and (c) are Section 1.2.
This is similar to the pipe heat-retaining heater 1 explained in FIG. The power supply unit 20 shown in (b) has an inner cylinder 22. The outer cylinder 24 has the same structure as the piping heat insulation heater l, and this outer cylinder 22
Two parallel conducting wires 28a and 88a' are held extending in the longitudinal direction between the two parallel conducting wires 28a and 88a', and intermediate conducting wires 28b and 28b' extending in the circumferential direction are parallel conducting wires 28a and 28, respectively. connected to a'. A piping temperature sensor 25 is attached to the power supply section 20, and depending on the temperature detected by the pipe temperature sensor 25, the power supply is automatically turned on and off using, for example, a bimetallic switch t. The power source is connected to the conductor 28b via the cord 28c from the plug 28d.
, 23b', 28a, and 281. code 2
A light emitting diode for power confirmation and an energization confirmation device are attached to 8c. A female connecting terminal 27, 27' and a male connecting terminal 28 are provided at both ends of the parallel conducting wire 28 a e 23 a', respectively.
, 28' is installed, and the upper pipe insulation heater 1.1
The male connection terminals 8 d and 8 d' are the female connection terminals 27
, 97', and the lower female connection terminal a a e 3
Male connection terminals 28 and 28' are inserted into a' and electrically connected.

FIG. 6 is a perspective view of the cover 10 used in FIG. 4,
It is made of electrically insulating and waterproof thin sheet material and is formed into a double arc shape. Figure 5 (a), (b), (C)
Also used for connections in cases of When using the cover 10, the inner piece 10a of the cover 10 is inserted through the opening 2a (FIG. 1), and the piping heater l is held in the gap 11 between the outer and outer pieces 10a, 10b.

Adhesive is applied to opposing surfaces of the inner and outer pieces 10a and 10b, so that the cover 10 is easily fixed.

FIG. 7 is a perspective view of an embodiment of the connecting conductor 16 in the piping elbow portion 15, in which a female connecting terminal 16a and a male connecting terminal 16b are attached to both ends of the connecting conductor 16 bent to match the elbow portion 15. Two parallel conducting wires are used to connect the piping insulation heater and the piping insulation heater.

For construction purposes, the pipe insulation heater 1 explained in Figure 1.2.8
When used by cutting at the longitudinal middle part, electrically the heating element 8 per unit length of two parallel conductors 3a and 3a'
Since the electrical resistance of b, that is, the amount of heat generated, is constant, it can be cut and used at any position. In the case of using this cutting method, as shown in Figure 8 (at, (bl), the conductor wire 8a*8a' is cut along the chain point 1b in the vicinity of the cut section 1a of the piping heater 1, leaving the exposed wire 8a*8a'. Conductor 3
a e 3 a' KFor example, female connection terminals 8c, 8c'
Attach. Pipe insulation heater 1 to be attached to the pipe
If the opening 1a of the tube is widened, it will easily expand and contract due to its elasticity, and will be easily attached to the piping and will not slip down.

When the pipe heat insulating heater 1 is attached to the pipe, a heat insulating material made of styrofoam or the like is attached to the outer periphery of the pipe.

〔Effect of the invention〕

In the present invention, since a flat heating element is arranged between two parallel conductors, the amount of heat generated by the heating element per unit length of the parallel conductors is constant. can be cut and used. Furthermore, the structure does not allow double mounting of heating elements on the piping, and abnormal heat generation is completely avoided. When connecting multiple piping heaters, the male and female connection terminals can be connected to each other without leaving the parallel conductors at the connection part, and the connection part can be covered with a cover after connection, making the connection easy and reliable. Can be implemented. In addition, since it is made of an elastic material with openings formed in the longitudinal direction, it can be easily fitted to piping by expanding it, and it does not easily fall off due to its own gravity, so there is no need to hold it with wire, etc. Overheating due to electrical short,
Fire outbreak is completely prevented.

Furthermore, since there is no need to wrap wires or strips around the pipe as in the past, installation is extremely easy, even if the space between the pipe, the water pipe, and the wall is narrow, for example.

[Brief explanation of drawings]

Fig. 1 is a perspective view of one embodiment of the present invention, Fig. 2 is a developed view of Fig. 1, Fig. 3 is a vertical new view of Fig. 2, and Fig. 4 is a perspective view for explaining the connection situation. , FIG. 5(a). (bl, (c) is a perspective view showing the connection with the power supply part, Fig. 6 is a perspective view of the cover for the connection part, Fig. 7 is a perspective view of the conductor for the piping elbow part, Fig. 8 (a) (bl 1 is a perspective view for explaining processing of a cut part. l... Piping heat retention heater, 2... Inner cylinder. 2a... Opening, 3... Heat generating part. 8a, 3a'...Conductor wire, 3b...
heating element. 4... Outer tube. 1st rB 2nd figure 3rd figure
5EI Figure 6 'i'' Figure 8 Amendment to Figure Procedures (Voluntary) April 2y, 1980

Claims (6)

[Claims] (1) An outer cylinder made of an elastic, electrically insulating and waterproof thin sheet material with openings formed over the entire length of the cylinder, and a longitudinal direction attached to the inner periphery of the outer cylinder. a heat generating part consisting of two parallel conductive wires extending to the outer cylinder and a flat heating element electrically connected between the two parallel conductive wires; and the heat generating part is tightly attached to the inner periphery of the outer cylinder. The inner cylinder is made of an electrically insulating and waterproof thick sheet adhered to the inner periphery of the outer cylinder, and two parallel conductor connection terminals are installed at both ends of the outer cylinder and the inner cylinder in the longitudinal direction. A piping heat retention heater characterized by a device fixed between an outer cylinder and an inner cylinder. (2) The inner diameter of the inner cylinder is 10% of the outer diameter of the tube to be held.
The heat-generating heat-retaining heater according to claim 1, which is 30% smaller. (3) The heat generating heater according to claim 1 or 2, which can be used by cutting at right angles to the longitudinal direction. (4) The heat generating heater according to claim 1 or 2, which can be used by being connected in the longitudinal direction. (5) The heat-generating heat-retaining heater according to any one of claims 1 to 4, which is equipped with a pipe temperature sensor, a power source, and energization confirmation means. (6) The heat-generating heat-retaining heater according to any one of claims 1 to 5, which is connected to a bent portion of the pipe by a connecting member that connects the heat-generating heat-retaining heater and the heat-generating heat-retaining heater.