JPH035686A - Drain pipe - Google Patents

Abstract

PURPOSE:To improve a productivity of a drain pipe having a heater by a method wherein a hollow drain pipe and a heating pipe having a cavity part for use in storing a freezing prevention heater formed along an outer surface of the drain pipe are integrally formed. CONSTITUTION:At first, a heater 20 in which a heat transmitting plate 22 of the heater 20 is contracted with an outer surface of a drain pipe 13 is inserted into a heating pipe 15 of a main body 10 of the drain pipe injection mold. Then, an out-going wire 24 of the heater 20 is bent so as to be positioned at a stepped part 17 between an outer surface of a heating pipe 15 and an outer surface of a drain pipe 13, a joint part 27 with a lead wire 25 is positioned, a hollow core is inserted into the drain pipe 13, it is covered by a seal member 16 such as non-vulcanized rubber or the like, a cloth member immersed with water from above is wound around it in a helical form and this is vulcanized under this condition. After vulcanization, a core metal is pulled out and the cloth member is removed. In this way, it is possible to perform an efficient production of the drain pipe having the heater.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] Industrial Field of Application The present invention relates to an improvement in a drain pipe in which a heater is embedded, which is connected to a dew pan located below a cooler.

Conventional technology A drain pipe anti-freeze device was developed in 1973, in which a drain pipe was connected to a drain pan (W saucer) installed below a cooler via a joint, and a band-shaped heating element was inserted into the drain pipe.
There is a publication No. 41227.

In addition, between the core material and the outer sheathing member covering the core material, a flexible drain pipe with a heater for preventing freezing that is spirally wound around the core material is embedded in the condenser tray. Utility Model Publication No. 62-24220 as a cooling device inserted and connected to the outer periphery of the drain tube.
There is a publication.

Problems to be Solved by the Invention In the former technique mentioned above, the heating element is inserted into the drain pipe, and the waste water comes into direct contact with the heating element itself, so the heating wire inside the heating element The surface of the insulating material covering the battery becomes gradually thinner due to hydrolysis, and the heating wire is eventually exposed, leading to partial insulation failure and electrical leakage. For this reason, the heating element has a short lifespan and must be replaced at an early stage.

On the other hand, with the latter technique, there were several problems in manufacturing the drain pipe. In other words, when winding the antifreeze heater spirally around the core material, there are safety standards for the spacing and tension of the heater when wrapping, and machines are used to comply with these standards. I couldn't deal with it by wrapping it in place, so I had no choice but to rely on manual work. Furthermore, winding the heater requires considerable skill, and the productivity is extremely poor. Drainage pipes are usually used not only in straight lines but also with bent parts, so during this bending process, the contact area of the spirally wound heater with the core material may not be kept within the effective range. In addition to tension, torsional force is applied to the heater itself, which may cause it to break, making it unable to fully perform its original function as a heater. In addition, since the core material around which the heater is wrapped is coated with the outer covering material, it takes more time to manufacture the drain pipe, reducing productivity, which is extremely time consuming compared to the production of other parts of the cooling system. Since it was slow, it was the biggest cause of decreasing productivity as a cooling device.

Therefore, an object of the present invention is to provide a drain pipe that is less prone to insulation defects and is easy to manufacture.

[Structure of the invention]

The present invention provides a flexible water pipe in which a heater for preventing freezing is embedded, and includes a hollow drainage pipe section that guides drainage water from one end and guides it to the other end; It is integrally formed with a caloric heating tube section having a cavity formed along the outer surface of the tube section and accommodating a heater.

The cavity formed by the heating pipe serves as a storage space for the heater, and the drainage pipe serves as a drainage channel for discharging waste water, as well as a waterproof wall that prevents the heater from coming into contact with water. At the same time, this waterproof wall portion also functions as a heat transfer wall that transfers heat from the heater to the drainage pipe section.

EXAMPLES Hereinafter, examples of the present invention will be described with reference to FIGS. 1 to 8.

1 is a cooling device that is hung on the ceiling wall of a large refrigerator-freezer such as a prefabricated refrigerator, and the front, part of the back, and the entire bottom of the main body case 2 made of metal are opened; A hanging device 3 is provided on the upper surface. Further, a cooler (not shown) is installed inside the main body case 2 so that its air suction side faces the rear opening, and a blower device 4 for circulating cold air is installed at the front opening. 5 is a fan guard fixed around the front opening. Furthermore, the lower opening is covered with a condensation tray 6, which is attached to the main body case 2 so as to be openable and closable using a suitable opening/closing device. The dew pan 6 is located directly below the cooler and receives the dew and frost that falls from the cooler during defrosting, as well as the dew from the main body case, and is connected to the drain port 8 and the drain port at the appropriate location. A drainage pipe section 9 is provided to provide a drainage tube.

Reference numeral 10 denotes a flexible drain pipe whose one end side is connected to the drain pipe portion 9 of the drain pan 6 and fixed with a clip 11 consisting of two upper and lower stages of annular wire. This drain pipe 10 includes a hollow drain pipe part 13 that communicates one end with the drain cylinder part 9 to lead out the drain water from the drain tray 6, and is integrally formed along the outer surface of the drain pipe part 13, which will be described later. Heating pipe section 1 equipped with a cavity 14 as a storage space for storing a heater 20 for freezing prevention
A drain pipe main body 10A is formed by extrusion molding using a material with good water resistance and flexibility such as unwashed rubber, and is heated to give a certain shape. A sealing member 16 made of rubber or the like seals the opening at one end of the heating tube 15 after the heater 20 is housed therein.

Reference numeral 20 denotes a heater as a cryo-assistant heating device housed in the heating pipe section 15 of the drain pipe 10, and a cord heater 21 such as a silicone heater with glass braid is connected to a metal plate with good thermal conductivity, e.g. Heat transfer plate 2 made of aluminum plate
2 in a substantially U-shape and then covered with a covering member 23 such as an aluminum tape (see FIG. 4). still,
The hood heater 21 is not limited to a U-shaped arrangement, but may be arranged in a meandering shape, and the important thing is that it is arranged reliably apart from adjacent parts. In addition, a lead wire 25 of this heater 20 will be described later.
The lead wire portion 24 for connection with the heat exchanger plate 22 is drawn out from one end side of the heat exchanger plate 22. And this lead line 2
4 and the tip of the lead wire 25 are connected with a joint fitting or the like, and then this connection portion is covered with an insulating material (hereinafter, this connection portion will be referred to as a joint portion 27).

Next, the heater 20 is installed on the drain pipe main body 10A, and the desired bent portion is configured from the state where the heater is installed, and the drain pipe 10 is
The process of doing so will be explained.

First, the heater 20
The heater 20 with the heat transfer plate 22 in contact with the outer surface of the drainage pipe part 13 is inserted with the other end of the heater first, and only the part of the heater 20 beyond the lead wire part 24 is in contact with the outer surface of the drainage pipe part 13. Insert the heater until it protrudes from the opening at one end of the section 15.

Next, the lead wire portion 24 of the heater 20 is connected to the stepped portion 1 formed by the outer surface of the heating tube portion 15 and the outer surface of the drainage tube portion 13.
7, and position the joint part 17 at the stepped part 17.

With respect to the drain pipe main body 10A in this state, a hollow core metal 30 formed in an appropriate shape (in this example, there is a bent part) is inserted into the drainage pipe part 13 to drain water to the core metal 30. The drain pipe main body 10A is formed into an appropriate shape by covering the drainage pipe main body 10A. Then, a sealing member 16 made of unfluidized rubber or the like is covered at least from one end side of the drain pipe main body 10A to the joint part 27, and this sealing member 16 is attached to the main body 10A.
A cloth member 29 moistened with water is wound spirally over this in order to hold and fix it.

After this, the heating process begins, and the wastewater is placed in a steam kiln and heated for a predetermined time at an appropriate temperature (in this case, a temperature of 150° to 180°C) to form a certain shape that matches the shape of the core metal 30. Build up the tube 10. And from the drain pipe 10 to the core metal 3
0 (or remove the drain pipe 10 from the core metal 30)
, the cloth member 29 is removed, and the formation of the drain pipe 30 is completed.

In this heating step, the sealing member 16 seals the opening at one end of the heating tube section 15, and also seals the opening at one end of the heating tube section 15.
7 is pressed and fixed to the stepped portion 17.

One end of this drain pipe 10 may be connected to the drain pipe portion 9 of the drain pan 6, fixed by a clip 11, and the other end may be led out to the outside of the prefabricated refrigerator.

According to the drain pipe 10 as described above, the heater 20 is installed in the cavity 14 of the heating pipe section 15 formed on the outer surface of the drain pipe section 13.
Since the heater 20 can be buried in the drain pipe 10 by simply storing the heater 20, the heater installation work can be greatly simplified compared to the case where the heater 20 is wrapped around the drain pipe 10.
The productivity of drainage pipes can be improved. Also heater 2
Since the required length of the drain pipe 10 can be shortened, the manufacturing cost of the drain pipe 10 can be reduced. Furthermore, the heater 20 has a heat transfer plate 22
Because of this, heat transfer to the drain pipe section 13 is promoted, and the heater can be located in the part that requires heating depending on the shape of the drain pipe 10, making it possible to perform concentrated heating on this part. Since there is no need to heat unnecessary parts, the power required for the heater can be suppressed.

On the other hand, since the heater 20 is housed in the heating pipe section 15 and can be held separated from the drainage water by the drainage pipe section 13, the heater 20 does not come into contact with the drainage water, and the heater 20
Hydrolysis no longer occurs in the coating member 23 of 0,
Electric leakage can be avoided.

〔Effect of the invention〕

As detailed above, according to the present invention, the drainage pipe can form a drainage channel, and the heating pipe is integrally formed to form a cavity along the outer surface of the drainage pipe. The space can be used as a storage space for the heater. In addition, since the heating pipe section is integrally formed on the outer surface of the drainage pipe section, the heater housed in the heating pipe section is prevented from coming into contact with the waste water, and water is added when the heater comes into contact with the waste water. This prevents decomposition from occurring. Furthermore, the heater for heating the drain pipe section can be buried within the drain pipe by simply storing it in a cavity that acts as a storage space.
The work of burying the heater can be greatly simplified, and the productivity of drain pipes equipped with heaters can be improved. Since the heater is simply housed in the heating pipe, the required length of the heater can be shortened compared to a heater wrapped around the pipe, and the power required for the heater can be reduced. Cost reduction can be achieved.

[Brief explanation of drawings]

Each figure shows an embodiment of the present invention, and FIG. 1 is a partially cutaway side view of a drain pipe, FIG. 2 is a sectional view taken along line A-A in FIG. 1, and FIG.
The figure is a plan view of the heater, Figure 4 is a sectional view taken along line B-B in Figure 3,
Fig. 5 is a perspective view of the cooling device with a drain pipe attached, Fig. 6 is an enlarged vertical sectional view of the connection part of the drain pipe, and Fig. 7 is a partially cutaway state showing the drain pipe body attached to the core metal. FIG. 8 is a side view showing a state in which the cloth member is wrapped around the seal member. 1... Prefabricated refrigerator, 6... Dew saucer, 9
...Drain pipe part, 10...Drain pipe, 13...
- Drainage pipe section, 14... Cavity, 15... Heating pipe section, 16... Seal member, 20... Heater.

Claims (1)

[Claims] 1. A flexible drain pipe with a heater for freezing prevention embedded therein, which has a hollow drain pipe section and a heating cavity formed along the outer surface of the drain pipe section to house the heater. A drain pipe characterized by being integrally formed with a pipe part.