JPH0532459U - Antifreeze water pipe - Google Patents

Abstract

(57) [Summary] [Structure] PTC heater 3 with positive temperature coefficient thermistor
Is provided along the outer wall of the water pipe 1 via the metal plate 2. [Effect] The construction can be performed only by piping, and the construction period can be shortened and construction mistakes such as forgetting to attach the heater can be reduced as compared with the conventional three-stage construction including piping, heater attachment, and heat retention step.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an antifreezing type water pipe that prevents a water pipe freezing rupture accident that occurs in winter in cold regions.

[0002]

[Prior Art]

 Conventionally, for the above-mentioned antifreeze type water pipes that are piped in homes, etc., after the pipes have been installed, a ribbon heater is wound around, and after heat insulation is performed, the ribbon heater is appropriately set by a temperature controller. It is known that the water pipe is heated at a proper temperature to prevent freezing.

[0003]

[Problems to be solved by the device]

 However, in the above-mentioned configuration, there are three construction steps, that is, water pipe piping construction, ribbon heater winding construction, and heat insulation construction. Since there are many construction steps, construction mistakes, for example, piping parts where the ribbon heater is not wrapped This has caused a problem of causing a water pipe freezing rupture accident.

[0004]

[Means for Solving the Problems]

 In order to solve the above problems, the antifreezing type water pipe according to claim 1 is characterized in that a heat generating means including a positive temperature coefficient thermistor is provided along the outer wall of the water pipe.

In order to solve the above problems, the antifreezing type water pipe according to claim 2 is characterized in that, in the antifreezing type water pipe according to claim 1, the water pipe is a joint member.

[0006]

[Action]

 According to the above-mentioned configurations of claims 1 and 2, since the water pipe is provided with the heat generating means, the tap water in the water pipe can be heated to prevent freezing and the freezing of the tap water can be prevented. It can be avoided. Further, in each of the above-mentioned configurations, since the heat generating means and the water pipe are integrally provided, the construction may be performed only by piping, and compared with the conventional three-step construction such as piping, heater attachment, and heat retention step, The construction period can be shortened, and construction mistakes such as the generation of piping without heat generation means can be reduced.

In addition, in each of the above-mentioned configurations, the heat generating means is composed of a positive temperature coefficient thermistor, so that the heat generation means has excellent durability as compared with the conventional ribbon heater, and the temperature rising speed is high. Since the thermistor has a self-temperature control function, the conventional temperature controller can be omitted and the size can be reduced.

Further, in the structure according to the above-mentioned claim 2, since the joint member as the water pipe has the minimum necessary length, it is possible to save the labor of cutting such a water pipe to a desired length. Therefore, it becomes easy to attach it to a necessary place.

[0009]

【Example】

 An embodiment of the present invention will be described below with reference to FIGS. As shown in Fig. 1, the antifreezing type water pipe is a coaxial double pipe, and a metal plate 2 having good heat conductivity is provided along the length direction on the outer peripheral surface of the inner pipe (water pipe) 1. A PTC heater (heat generating means) 3 formed into a substantially rectangular plate shape is provided at a predetermined position on the metal plate 2 so that its longitudinal direction extends along the axial direction of the inner tube 1.

Therefore, when the antifreezing water pipe is cut out in the radial direction in order to adjust the length, the above-mentioned antifreezing water pipe does not include a portion corresponding to the PTC heater 3 indicated by L ₁ in the drawing. At L ₂ , a portion of the antifreezing type water pipe is cut out in the radial direction and the length is adjusted before use.

The contact surface of the metal plate 2 with the outer peripheral surface of the inner pipe 1 is formed in a concave arc shape so as to fit with the outer peripheral surface, while facing the PTC heater 3 of the metal plate 2. The surface to be formed is flat.

Further, as shown in FIG. 2, a heat insulating material 4 is provided so as to cover the inner tube 1, the metal plate 2 and the PTC heater 3, and an outer tube 5 is further provided so as to cover the heat insulating material 4. It is provided so as to be coaxial with the internal pipe 1 described above, and has a double pipe structure.

As shown in FIG. 3, the PTC heater 3 has excellent heat conductivity and electrical insulation through the PTC ceramics 3c which is a rectangular plate-shaped positive temperature coefficient thermistor and the electrode plate 7 which supplies electricity to the PTC ceramics 3c. Is laminated with a plate-shaped insulator 6 made of alumina or the like.

The electrode plate 7 and the insulator 6 are formed so as to further integrally extend from the longitudinal end portion of the PTC ceramics 3c. Therefore, the electrode plate 7 is formed with the exposed surface 7a. The first lead wire 8 is soldered to 7a, while the second lead wire 9 is soldered to the electrode surface 3b facing the surface of the substantially plate-shaped PTC ceramics 3c that contacts the electrode plate 7.

The material of the inner tube 1 and the outer tube 5 is not particularly limited as long as it can withstand the heat generation temperature of the PTC heater 3 used and can withstand water pressure, but vinyl chloride resin or the like is used. used.

The PTC ceramics 3c is composed of a material having a positive temperature coefficient (Positive Temperature Coefficient), for example, a ceramic semiconductor whose main raw material is barium titanate, and has a low resistance from room temperature to the Curie temperature Tc (rapid change temperature). However, it is a positive temperature coefficient thermistor as a heat sensitive element having a characteristic that the resistance value sharply increases when it exceeds the Curie temperature Tc.

With this characteristic, when a voltage is applied to the PTC ceramics 3c, initially, the resistance is low, so that the initial power consumption is large and the temperature rises rapidly, and when the temperature exceeds the Curie temperature, the resistance value sharply increases. As a result, power consumption is significantly reduced. As a result, the PTC ceramics 3c does not rise above a certain temperature and maintains a stable temperature, and has a self-temperature control function.

The Curie temperature Tc of the PTC ceramics 3c can be arbitrarily set within the range of about 30 to 250 ° C. depending on the material composition. The PTC ceramics 3c in the above-mentioned embodiment is effective for preventing freezing of tap water. The temperature of the inner tube 1 can be realized, and the Curie temperature Tc is set in consideration of safety and power saving.

The shape and size of the PTC ceramics 3c are not particularly limited, but the PTC ceramics 3c are formed into a plate shape according to the sizes of the inner tube 1 and the metal plate 2.

According to the configuration of the above embodiment, since the water pipe is integrally provided with the PTC heater 3, the tap water in the water pipe can be heated to prevent freezing, and the tap water can be heated. Freezing can be avoided. In addition, the above construction requires only piping work, and the construction period can be shortened and cost can be reduced as compared with the conventional method of installing the heater after piping, such as the three-stage construction of piping, heater installation, and heat retention process. Moreover, construction mistakes such as forgetting to attach the heater can be prevented, and the antifreeze can be reliably achieved.

In addition, in the above configuration, since the PTC heater 3 includes the PTC ceramics 3c as the PTC thermistor, the durability is excellent and the temperature rising rate is higher than that of the conventional ribbon heater. Since the PTC ceramics 3c is fast and has a self-temperature control function, the conventional temperature controller can be omitted and the size can be reduced.

In the above configuration, an example in which the PTC heater 3 is provided in an ordinary water pipe has been given. However, as shown in FIG. 4, the PTC heater 3 may be a water pipe for a joint having a short axial length, such as a joint. It may be provided in the pipe (joint member) 1. With such a configuration, it is possible to omit the work of cutting out for adjusting the length, and it becomes easy to attach it to a necessary place. Further, as shown in FIG. 5, it may be provided at the bent portion of the water pipe 1 or at the bent joint water pipe 1.

[0023]

[Effect of the device]

 As described above, the antifreezing type water pipe according to the first aspect is configured such that the heat generating means including the positive temperature coefficient thermistor is provided along the outer wall of the water pipe.

Therefore, in the above-mentioned configuration, the construction can be performed only by the piping construction, and the construction period can be shortened as compared with the conventional three-stage construction such as the piping, the heater mounting, and the heat retaining step, and the heater mounting can be forgotten. This has the effect of reducing construction errors such as.

As described above, the antifreezing type water pipe according to claim 2 is the antifreezing type water pipe according to claim 1, wherein the water pipe is a joint member.

Therefore, with the above-mentioned configuration, the construction can be performed only by piping, and the construction period can be shortened as compared with the conventional three-stage construction including piping, heater attachment, and heat retention step, and the heater can be forgotten to be attached. In addition to the effect that construction errors such as the above can be reduced, the work of cutting out for adjusting the length can be omitted, and therefore, it can be easily attached to a necessary place.

[Brief description of drawings]

FIG. 1 is a perspective view of an antifreezing type water pipe of the present invention.

FIG. 2 is a radial cross-sectional view of the antifreezing water pipe.

FIG. 3 is a partial cross-sectional view in the length direction of the antifreezing type water pipe.

FIG. 4 is an axial sectional view of a modified example of the antifreezing type water pipe.

FIG. 5 is a partially cutaway perspective view of another modification of the antifreezing water pipe.

[Explanation of symbols]

 1 Internal pipe (water pipe) 3 PTC heater (heating means)

Claims (2)

[Scope of utility model registration request] 1. An antifreezing type water pipe, wherein a heat generating means having a positive temperature coefficient thermistor is provided along an outer wall of the water pipe. 2. The antifreeze type water pipe according to claim 1, wherein the water pipe is a joint member.