JP2579816B2 - Drain pipe - Google Patents

Description

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

2. Description of the Related Art As a drain pipe freezing prevention device, a drain pipe is connected to a drain pan (dew pan) installed below a cooler through a joint, and a belt-shaped heating element is inserted into the drain pipe.
There is 41227 gazette. In addition, a connection portion of a flexible drain pipe in which a freeze prevention heater spirally wound around the core material is embedded between the core material and a jacket member covering the core material is provided on the dew pan. There is Japanese Utility Model Publication No. Sho 62-24220 as a cooling device inserted and connected to the outer periphery of a drainage pipe portion.

According to the former technique described above, the heating element is inserted into a drain pipe, and the waste water comes into direct contact with the heating element itself. The surface of the insulating material covering the film gradually becomes thinner due to the hydrolysis, and eventually, the heating wire is exposed, resulting in partial insulation failure and electric leakage in some cases. For this reason, the service life of the heating element is short, and replacement must be performed early.

On the other hand, the latter technique has several problems in producing a drain pipe. That is, in spirally winding the anti-freezing heater around the core material, there are standards for stability in the winding interval and the tension of the heater at the time of winding, and in order to conform to the standards, winding using a machine is required. I could not cope with it and had to rely on manual work. Also, when winding the heater,
A considerable amount of skill was required, and the productivity was extremely poor. And since the drainage pipe is usually used not only in a straight line but also with a bent part, the heater wound spirally during this bending work cannot keep the contact area with the core material within the effective range. In addition, the torsion force besides the tension is applied to the heater itself so that the heater may be cut, and the original function of the heater may not be sufficiently exhibited. In addition, since the core member around which the heater is wound is covered with the jacket member, the production of the drainage pipe requires more time, which lowers the productivity, and is extremely low compared to the production of other parts in the cooling device. Because of the slowness, it was the biggest cause of lowering the productivity of the cooling device.

Accordingly, the present invention makes it difficult to cause insulation failure, is easy to manufacture, and can reliably prevent the heater from coming off from the drain pipe even when the drain pipe is bent into an approximately L-shape, and can prevent drainage flowing under the drain pipe. It is an object of the present invention to provide a drain pipe that heats from the lower part of the drain pipe by effectively utilizing the heat of the heater and suppresses heat radiation from the heater to the drain pipe atmosphere.

[Configuration of the invention]

The present invention provides a flexible water distribution pipe in which a heater for preventing freezing is embedded, and has a substantially L-shaped and hollow drainage pipe section for guiding drainage from one end and guiding it to the other end. And a hollow heating tube portion formed in the pipe axis direction along at least the lower surface of the drainage tube portion to house and cover the heater.

The cavity formed by the heating pipe portion acts as a storage space for the heater, and the drainage tube portion acts as a drainage channel for taking out drainage, and a waterproof wall for preventing the heater from coming into contact with water. In addition to acting as a heat transfer wall, the portion serving as a waterproof wall acts as a heat transfer wall that transmits heat from the heater to the lower surface of the drainage pipe portion where drainage flows easily. In addition, the heating pipe portion functions as a blocking wall that covers the heater and blocks heat radiation from the heater to the atmosphere of the drain pipe, and also functions as a support member that prevents the heater from coming off the drain pipe when the drain pipe is bent. .

Embodiment An embodiment of the present invention will be described below with reference to FIGS.

A cooling device 1 is suspended from the top wall of a large-sized refrigerator-freezer such as a prefabricated refrigerator. The cooling device 1 opens a part of the front surface, the rear surface, and the entire bottom surface of a main body case 2 made of metal. The suspension device 3 is provided on the upper surface. A cooler (not shown) is provided in the main body case 2 so that the air suction side faces the rear opening, and a blower 4 for circulating cool air is provided at the front opening. Reference numeral 5 denotes a fan guard fixed around the front opening. Further, the lower surface opening is covered with a dew receiving tray 6, and is attached to the main body case 2 so as to be openable and closable by an appropriate opening and closing device. The dew tray 6 is located immediately below the cooler, and receives the dew and frost falling from the cooler during defrosting and the dew from the main body case. A drain pipe section 9 is provided.

Reference numeral 10 denotes a flexible drain pipe whose one end side is connected to the drainage tube portion 9 of the dew receiving tray 6, and which is fixed by a clip 11 composed of an upper and lower two-stage annular wire. The drainage pipe 10 has a substantially L-shaped and hollow drainage pipe portion 13 having one end communicating with the drainage tube portion 9 to lead out the drainage of the dew tray 6, and an outer surface and a lower surface of the drainage tube portion 13. A hollow heating tube 15 having a cavity 14 as a storage space for accommodating a freeze prevention heater 20 which will be described later, and a material having good water resistance and flexibility such as unwashed rubber. The drain pipe main body 10A formed by the extrusion molding method is subjected to a flow treatment to form a uniform shape.
A sealing member 16 made of rubber or the like for sealing the opening on one end side of the heating tube after the heater 20 is housed in the heating tube 15.

Reference numeral 20 denotes a heating pipe section housed in the heating pipe section 15 of the drain pipe 10.
15 is a heater as a heating device for freezing prevention covered by the outer wall, and a code heater 21 such as a silicon heater with a glass braid is placed on a heat transfer plate 22 made of a metal plate having good heat conductivity, for example, an aluminum plate. After being arranged in a substantially U-shape, it is covered with a covering member 23 such as an aluminum tape (see FIG. 4). Note that the cord heater 21 is not limited to the U-shaped arrangement, but may be a meandering shape. A lead wire portion 24 for connecting the heater 20 to a lead wire 25 described later is drawn from one end of the heat transfer plate 22. Then, after connecting the tip of the lead wire 24 and the tip of the lead wire 25 with a joint fitting or the like, the connection portion is covered with an insulating material (hereinafter, this connection portion is referred to as a joint portion 27).

Next, the process of disposing the heater 20 in the drain pipe main body 10A and bending the drain pipe 10 from the state where the heater is disposed to form a desired bent portion to form the drain pipe 10 will be described.

First, the heater 20 in which the heat transfer plate 22 of the heater 20 is brought into contact with the outer surface of the drainage pipe portion 13 from an opening at one end side of the heating pipe portion 15 in the drainage pipe main body 10A that is extruded linearly. The other end of the heater is inserted first, and the heater is inserted until only the portion of the heater 20 beyond the lead wire portion 24 projects from the opening on one end side of the heating tube portion 15.

Next, the lead wire portions 24 of the heater 20 are respectively connected to the heating tube portions.
It is bent so as to be located at the step 17 formed by the outer surface of the drain 15 and the outer surface of the drainage pipe 13, and the joint 17 is located at the step 17. With respect to the drain pipe main body 10A in this state, a hollow core metal 30 formed in an appropriate shape (a bent portion in this example) is inserted into the drain pipe section 13 so as to be drained to the core metal 30. The drainage pipe main body 10A is appropriately shaped by covering the drainage main body 10A. Then, at least a portion from one end side of the drain pipe main body 10A to the joint portion 27 is a sealing member such as a non-flowed rubber.
In order to cover and secure the seal member 16 to the main body 10A, a cloth member 29 impregnated with water is spirally wound from above.

After that, it enters the feeding process, puts it in a steam kiln, and heats it for a predetermined time at an appropriate temperature (in this case, a temperature of 150 to 180 ° C.) to form a drain pipe having a fixed shape according to the shape of the core 30.
Build 10 Then, the core metal 30 is removed from the drain pipe 10 (or the drain pipe 10 is removed from the core metal 30), the cloth member 29 is removed, and the formation of the drain pipe 30 is completed.

In this feeding step, the sealing member 16 is
The one end opening of the 15 is sealed, and the joint 27 is pressed and fixed to the step 17.

One end of the drain pipe 10 may be connected to the drain cylinder 9 of the dew receiving tray 6, fastened and fixed by the clip 11, and the other end may be led out of the prefabricated refrigerator.

According to the drain pipe 10 as described above, the heater 20 is inserted into the drain pipe 10 only by storing the heater 20 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, the work of arranging the heater can be greatly simplified as compared with the case where the heater 20 is wound, and the productivity of the drain pipe can be improved. Further, since the required length of the heater 20 can be reduced, the manufacturing cost of the drain pipe 10 can be reduced. Further, since the heater 20 includes the heat transfer plate 22, heat transfer to the drainage pipe portion 13 is promoted, and at least along the lower surface of the drainage pipe 10 that requires heating according to the shape of the drainage pipe 10. The heater can be positioned so that the lower part of the drain pipe 10 can be concentratedly heated effectively from the lower surface, freezing of the drain water flowing through the lower part of the drain pipe part 13 can be avoided, and unnecessary heating is not performed. Since the heater 20 is covered by the outer wall of the heating tube 15, the heat radiation from the heater to the periphery of the drain pipe can be suppressed, and the heat required in the heater 14 can be suppressed because the heat can be trapped in the cavity 14. it can.

On the other hand, the heater 20 is housed in the heating pipe portion 15 and can be held in a form separated from the drainage by the drainage pipe portion 13, so that the heater 20 does not come into contact with the drainage and the covering member 23 of the heater 20 is added to the water. Decomposition does not occur, and leakage can be avoided.

In addition, since the outer wall of the hollow heating tube section covers the heater and blocks heat radiation from the heater to the atmosphere of the drain pipe, heat radiation from the heater to the surroundings of the drain pipe can be suppressed, and heat is stored in the cavity. As a result, the drain pipe can be efficiently heated by the heat generated by the heater.

Further, the outer wall of the heating pipe portion formed along the pipe axis of the drain pipe serves as a support member for preventing the heater from coming off from the drain pipe when the drain pipe is bent. Accordingly, there is no need to remove the heater and attach the heater around the drain pipe again, and the workability can be greatly improved.

〔The invention's effect〕

As described above in detail, according to the present invention, the heater for heating the drainage pipe can be embedded in the drainage pipe only by being stored in the cavity acting as the storage space. The operation can be greatly simplified, and the productivity of the drain pipe with heater can be improved.

The outer wall of the hollow heating tube portion covers the heater to block heat radiation from the heater to the outside, and the heating tube portion is formed along at least the lower surface of the substantially L-shaped drainage tube portion. In addition to suppressing the heat radiation to the surroundings of the drain pipe, the heat can be stored inside the cavity and the heat generated by the heater can be effectively used to efficiently concentrate the drain pipe section from the bottom surface. As a result, the drain pipe The freezing of the drainage flowing along the lower surface of the portion can be reliably prevented.

The outer wall of the heating pipe section formed along the pipe axis of the drain pipe functions as a support member that prevents the heater from coming off from the drain pipe when the drain pipe is bent. There is no need to remove the heater with the bending and to attach the heater around the drain pipe again, so that the workability can be greatly improved.

[Brief description of the drawings]

FIG. 1 shows an embodiment of the present invention. FIG. 1 is a partially cutaway side view of a drain pipe, FIG. 2 is a sectional view taken along line AA of FIG.
FIG. 4 is a plan view of the heater, FIG. 4 is a sectional view taken along line BB of FIG. 3,
FIG. 5 is a perspective view of a cooling device having a drain pipe attached thereto, FIG. 6 is an enlarged longitudinal sectional view of a connection part of the drain pipe, and FIG. 7 is a partially cut-away state showing a state where the drain pipe main body is attached to a cored bar. FIG. 8 is a side view showing a state in which a cloth member is wound on a sealing member. 1 ... prefabricated refrigerator, 6 ... dew tray, 9 ... drainage tube part, 10 ... drainage pipe, 13 ... drainage pipe part, 14 ... hollow, 15
... Heating tube section, 16 seal member, 20 heater.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Hirotaka Nakano 2-18-18 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. (72) Inventor Shoji Kubota 2-18-18 Keihanhondori, Moriguchi-shi, Osaka (56) References JP-A-55-38439 (JP, A) JP-A-47-11461 (JP, U)

Claims (1)

(57) [Claims] 1. A flexible drain pipe in which a heater for preventing freezing is embedded, a substantially L-shaped hollow drain pipe section, and a pipe axial direction extending along at least a lower surface of the drain pipe section. A drain pipe formed integrally with a hollow heating pipe section formed to house and cover the heater.