JP2005233508A - Pipe joint connecting structure for cooling storage - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To simplify the work for forming a drain passage of defrost water. <P>SOLUTION: Front and rear flanges 54, 55 of hard resin are formed on one of connection ports 52 of an elbow 50, and a contact part 57 of soft resin, having a projection 58 is formed on the rear flange 55. An opening 41 of an inner box 11 is nipped from its front and rear sides by the flanges 54, 55, and the soft contact part 57 is closely kept into contact with an opening edge part 42 on a rear side, and sealed. The other connection port 53 has a double cylindrical structure composed of an inner cylinder 60 and an outer cylinder 61 of hard resin, and a fitting part 62 of soft resin, having a projection 64 is formed on a tip side of the outer cylinder 61. An end part of a drain pipe 35 is fitted between the inner and outer cylinders 60, 61, and the fitting part 62 is closely kept into contact with an outer peripheral face of the drain pipe 35 and sealed. The soft resin part and the hard resin part are integrally formed by two-color molding. The intrusion of resin foam in manufacturing and the leakage of defrost water in use can be prevented without performing extra seal-up. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a connection structure of pipe joints arranged in a defrost water drainage path in a cooling storage.

For example, in a commercial refrigerator, a defrosting operation is appropriately performed in order to remove frost attached to a cooler and increase cooling efficiency. The drainage path is provided with a drain pan for receiving defrost water on the lower surface side of the cooler, while a drain pipe is embedded in the refrigerator wall of the heat insulating box, and a drain port protruding from the drain pan is provided. The defrost water is inserted into the drainage pipe from the inlet formed in the inner box, and drained out of the warehouse through the drainage pipe (see, for example, Patent Document 1).
Here, when an inlet to the drain pipe described above is formed or when the inlet and the drain pipe are connected, a pipe joint such as an elbow is used. More specifically, a flange is formed at one end of the pipe joint, and an inlet is formed by applying this flange to the mouth edge on the back side of the opening of the inner box. The upper end of the drain pipe is fitted and connected. In addition, when the drain pipe is bent halfway, the divided drain pipes are connected to each other through a pipe joint.
JP 11-248335 A

By the way, in such a drainage route, it is a matter of course to prevent defrosted water from leaking, but at the time of manufacturing, drainage pipes and fittings are assembled at the same time when forming the outer shell of the heat insulating box. Since the foamed resin, which is a heat insulating material, is then filled in the outer shell, it is necessary to prevent the foamed resin from entering the pipe.
Therefore, it is necessary to apply adhesive or tape on the fitting part between the pipe joint and the drain pipe or the part where the flange of the pipe joint is applied to the edge of the inner box. There was a problem that work was troublesome.
This invention is completed based on the above situations, The objective exists in the place which simplifies the operation | work which forms the drainage path of defrost water.

  As means for achieving the above object, the invention of claim 1 is characterized in that a storage body is formed by a heat insulating box filled with a heat insulating material made of foamed resin between an inner box and an outer box, and the inside of the box is cooled. In the cooling storage where the defrost water from the cooler is discharged out of the cabinet through the drain pipe embedded in the heat insulating material of the main body, the end of the drain pipe or the entrance to the drain pipe; The pipe joint is connected to an opening formed in the inner box as much as possible, and the main body of the pipe joint is formed of a hard resin and is fitted to the peripheral surface of the end of the drain pipe in the pipe joint. It is characterized in that the mating portion to be joined or the contact portion applied to the opening edge portion of the inner box is formed of a soft resin.

According to a second aspect of the present invention, in the first aspect of the present invention, the pipe joint is provided with a cylindrical body made of a hard resin that is fitted to an end of the drain pipe, and the fitting section is provided on the cylindrical body. It is characterized in that is provided.
According to a third aspect of the present invention, in the first aspect of the present invention, the cylindrical body is formed as a double cylinder that fits between the inner periphery and the outer periphery of the drain pipe and is sandwiched between the inner and outer cylinder portions. It is characterized in that the fitting portion is provided.
According to a fourth aspect of the present invention, in the pipe joint according to the first aspect, the pipe joint is formed with a double flange made of a hard resin that sandwiches an opening edge of the inner box from both front and back sides. It is characterized in that the contact portion is provided on one of the flanges.

According to a fifth aspect of the present invention, in any one of the first to third aspects, a plurality of ridges extending over the entire circumference are formed on the circumferential surface of the fitting portion that is fitted with the circumferential surface of the drain pipe. Protrusions that are formed at intervals in the axial direction, or that the fitting portions themselves are formed on the circumferential surface of the cylindrical body that faces the circumferential surface of the drain pipe and that are formed at intervals in the axial direction. It is characterized by being a strip.
According to a sixth aspect of the present invention, in the first or fourth aspect of the present invention, a plurality of ridges having different diameters are provided on a surface of the abutting portion which is applied to the edge of the opening of the inner box. Are formed concentrically at intervals, or the abutting portions themselves are concentrically formed at intervals in the radial direction on the surface of the flange facing the mouth edge of the opening. It is characterized by being a plurality of different ridges.

  The invention according to claim 7 is the one according to claim 4 or 6, wherein a notch hole is formed in a mouth edge portion of the opening of the inner box, and the front flange is aligned with the notch hole. The contact portion is formed as a partial flange, and the contact portion is provided on the back flange, and the contact portion provided on the back flange is rotated by passing the front flange through the notch hole. It is characterized in that a stopper is provided which is prevented from coming off in close contact with the edge portion on the back side of the opening and restricts rotation by hitting the edge of the notch hole on the front flange.

<Invention of Claim 1>
Since the fitting part fitted to the peripheral surface of the end part of the drain pipe in the pipe joint, or the abutting part applied to the opening edge of the opening of the inner box is formed of a soft resin rich in flexibility. , Seals well with the other party. For this reason, it is possible to prevent the foamed resin from invading at the time of manufacture and the leakage of defrost water at the time of use. On the other hand, since the main body is made of a hard resin, it is not deformed by receiving the foaming pressure of the foamed resin, and the shape of the connecting portion and the inlet is properly maintained.
In particular, since it is not necessary to apply special weathering at the time of manufacturing, the operation is simplified, and the manufacturing cost can be reduced.

<Invention of Claim 2>
The end of the drain pipe is fitted in a so-called waisted cylinder made of hard resin and is firmly positioned and connected, and then the flexible fitting part is applied to either the inner or outer peripheral surface Therefore, the fitting portion can be reliably adhered over the entire circumference, and the seal is more reliably taken.
<Invention of Claim 3>
Since the cylindrical body is a double cylinder, the end of the drain pipe can be positioned and connected more firmly, and the seal by the fitting portion can be more reliably taken.
<Invention of Claim 4>
The pipe joint is firmly positioned by attaching a rigid flange made of hard resin between the front and back of the mouth edge of the opening of the inner box. In addition, since the flexible contact portion is applied to either the front or back mouth edge portion, it can be satisfactorily adhered over the entire circumference of the mouth edge portion, and a seal can be more reliably taken.

<Invention of Claim 5>
A plurality of ridges are formed on the fitting surface in the fitting portion, or the fitting portion itself is formed by a plurality of ridges, so that the frictional resistance when fitting to the end of the counterpart drain pipe is It is kept small, and the fitting work is performed smoothly.
In addition, when the volume of the foamed resin is changed in the flow path, the pressure change occurs in the portion, and the foamed resin tends to partially foam and harden. Therefore, when the gap is provided between the protrusions, when the foamed resin flows into the gap, the foam is foamed and cured, and further inflow of the foamed resin is prevented, that is, the piping is clogged with the foamed resin. Is reliably prevented.
<Invention of Claim 6>
Due to the properties of the foamed resin, the foamed resin is similarly foamed and cured in the gaps between the protrusions, and the foamed resin is prevented from further entering the opening.

<Invention of Claim 7>
When the pipe joint is rotated after passing the front flange through the notch hole, the front flange comes into sliding contact with the front edge of the front side, and the rotation is restricted when the stopper hits the edge of the notch hole. As a result, the pipe joint is attached in a state in which the contact portion provided on the back flange is brought into close contact with the edge portion on the back side of the opening after taking a predetermined rotation posture.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
<Embodiment 1>
A first embodiment of the present invention will be described with reference to FIGS.
In FIG. 1, the code | symbol 10 is a refrigerator main body, Comprising: It comprises the vertically long heat insulation box body of the front opening filled with the heat insulating material 13 which consists of foamed resin etc. between the inner box 11 and the outer box 12, While being supported by four legs 14, the inside is a storage chamber 15. A front opening of the storage chamber 15 is partitioned into two upper and lower openings 17 by a partition frame 16, and a heat insulating door 18 is attached to each opening 17 so as to be swingable.

A machine room 20 is provided on the upper surface of the refrigerator body 10, and a refrigeration device 21 is installed therein. The refrigeration apparatus 21 includes a compressor 22, a condenser 23, and the like, and is attached to a heat-insulating base 24 as a unit so that the base 24 closes the window hole 25 on the ceiling surface of the storage chamber 15. It is attached.
A drain pan 26 that also serves as an air duct is stretched on the lower surface side of the window hole 25 in the ceiling portion of the storage chamber 15, and a cooler chamber 27 is formed above the drain pan 26. The bottom surface of the drain pan 26 is formed to have a downward slope toward the rear edge (the right side in FIG. 1). A suction port 28 is opened in the front area, and a blow-out port 29 is cut off on the rear edge side. It is not formed.

  Inside the cooler chamber 27, a cooler 30 (evaporator) and an internal fan 31 are provided facing the suction port 28. The cooler 30 is circulated and connected to the above-described refrigeration apparatus 21 through a refrigerant pipe to constitute a known refrigeration cycle. When the internal fan 31 is driven while operating the refrigeration apparatus 21 (compressor 22), the indoor air in the storage chamber 15 is sucked into the cooler chamber 27 from the suction port 28 by the internal fan 31 and the air is Cold air is generated by heat exchange while flowing through the cooler 30, and the cold air is blown out from the outlet 29 along the inner surface of the storage chamber 15, so that the cold air is circulated and supplied into the storage chamber 15. It has become.

On the other hand, in order to remove the frost adhering to the cooler 30 or the like, a defrosting operation is appropriately performed. This defrosting operation is performed by energizing and heating a defrosting heater (not shown) equipped in the cooler 30, and after the defrost water is received by the drain pan 26, It drains out of the warehouse through a drainage channel 33 provided in the wall surface.
The drainage channel 33 is provided with an inlet 34 at an upper position of the rear wall 10A, and is formed by connecting two synthetic resin drainage pipes 35 and 36 with elbows 50 and 70. The first drainage pipe 35 is After descending straight in the back wall 10A, it descends diagonally to the left as viewed from the front, and then the second drain pipe 36 obliquely descends toward the front side in the left side wall 10B, and then reaches the bottom wall 10C. The pipe is piped straight down toward the drain port 37 provided. A drain port 38 protruding from the drain pan 26 is inserted into the inlet 34 of the drain channel 33, and a drain hose is connected to the drain port 37 and led to an appropriate drainage place.

  First, the structure of the formation part of the inlet 34 of the drainage channel 33 shown to the code | symbol A of FIG. 1 is demonstrated. As shown in FIG. 2 and FIG. 3, a first elbow 50 (corresponding to the pipe joint of the present application) is disposed in the formation portion of the inlet 34. The elbow 50 is made of a synthetic resin, but is integrally formed by two-color molding of a hard resin such as an ABS resin and a soft resin such as an elastomer. The elbow 50 has a shape in which two connection ports 52 and 53 intersect with each other at an angle of about 105 degrees on both ends of the main body 51, and the obliquely upward connection port 52 constitutes the inlet 34 described above, A downward connection port 53 is connected to the upper end of the first drain pipe 35.

  In the portion where the inlet 34 is formed, first, as shown in FIG. 4, a circular recess 40 is formed on the surface of the inner box 11, and a circular opening 41 is formed at the center of the bottom surface. A pair of cutout holes 43 having a predetermined width are formed in the rim portion 42 of the opening 41 with an interval of 180 degrees. Both notch holes 43 are formed at a position shifted from the upper and lower positions across the center of the opening 41, for example, by 45 degrees clockwise as viewed from the front.

  On the other hand, the connection port 52 of the elbow 50 is formed with a front flange 54 and a back flange 55 that can hold the mouth edge portion 42 of the opening 41 of the inner box 11 from both front and back sides. The front flange 54 has a shape aligned with the notch hole 43, and a pair of the flanges 54 are also formed with an interval of 180 degrees. Both front flanges 54 are formed so as to be positioned above and below the center of the connection port 52 when the other connection port 53 is oriented downward. The front flange 54 is made of hard resin like the main body 51. The front flange 54 is formed with a stopper 56 that protrudes from the back side on the front end side in the clockwise direction when viewed from the front, and can be abutted against the edge of the cutout hole 43.

  The back flange 55 is formed on the back side of the front flange 54 with an interval substantially equal to the plate thickness of the inner box 11, and has a height and thickness approximately twice that of the front flange 54, and on the back side of the opening 41. The ring-shaped mouth edge portion 42 is formed in a circular shape that hits the entire surface. Here, in the back flange 55, the half-thickness portion on the surface side in the root portion and the full-thickness portion of the tip portion are formed of a soft resin to form the contact portion 57, and the remaining portion is The main body 51 and the front flange 54 are formed of hard resin. Two circular protrusions 58 are formed concentrically and spaced apart in the radial direction on the surface side of the tip of the contact part 57.

The downward connection port 53 is formed in a double cylinder shape into which the upper end of the first drain pipe 35 (see FIG. 5) is inserted. The inner cylinder 60 is formed in a short size so as to be fitted almost closely to the inner periphery of the drain pipe 35. The inner cylinder 60 is made of the same hard resin as the main body 51.
On the other hand, the outer cylinder 61 can be fitted into the outer periphery of the drain pipe 35 almost tightly, and has a length dimension about six times that of the inner cylinder 60 and a thickness about twice as large. In the outer cylinder 61, the entire thickness portion on the distal end side in the length direction and the outer surface side in the center portion are formed of a soft resin to form a fitting portion 62, and the remaining portion is formed of a hard resin. ing.
On the peripheral surface where the soft resin portion (fitting portion 62) and the hard resin portion are joined, an uneven fitting structure 63 along the axial direction is formed. In addition, on the inner peripheral surface of the distal end portion of the fitting portion 62, three ridges 64 shown in the figure extending over the entire circumference are formed at intervals in the axial direction. Each of the protrusions 64 is formed in a cross-sectional mountain shape in which the front surface is an inclined surface 65 and the back surface is an upright surface 66.

  Next, the structure of the bent part of the drainage channel 33 shown by the symbol B in FIG. 1 will be described. As shown in FIG. 7, a second elbow 70 (corresponding to the pipe joint of the present application) is disposed at the bent portion. Similarly to the first elbow 50, the second elbow 70 is also integrally formed by two-color molding of a hard resin such as an ABS resin and a soft resin such as an elastomer. The elbow 70 has a shape in which two connection ports 72 and 73 are provided at both ends of the main body 71 at an angle of about 97 degrees, and both the upward and diagonally downward connection ports 72 and 73 are drain pipes. It connects with the edge part of 35,36.

  The upward connection port 72 is formed in a double cylinder shape like the downward connection port 53 of the first elbow 50 described above. When it repeats simply, the inner cylinder 60 is formed in a short size and is made of the same hard resin as the main body 71. In the outer cylinder 61, the entire thickness portion on the distal end side in the length direction and the outer surface side in the central portion are formed of a soft resin to form a fitting portion 62, and the remaining portion is formed of a hard resin. Yes. On the peripheral surface where the soft resin portion (fitting portion 62) and the hard resin portion are joined, an uneven fitting structure 63 along the axial direction is formed. In addition, on the inner peripheral surface of the distal end portion of the fitting portion 62, three ridges 64 shown in the figure extending over the entire circumference are formed at intervals in the axial direction.

The obliquely downward connection port 73 is formed as a single cylinder 75 in which the inner cylinder 60 is removed from the upward connection port 72, and the cylinder 75 is almost tightly connected to the end of the second drain pipe 36. The front end of the drain pipe 36 can be abutted against a stepped portion 76 that can be fitted externally and has a reduced diameter. In this cylindrical body 75, like the outer cylinder 61 of the upward connection port 72, the entire thickness portion on the distal end side in the length direction and the outer surface side in the central portion are formed of a soft resin to form the fitting portion 62. The remaining portion is formed of the same hard resin as that of the main body 71. Similarly, on the peripheral surface where the soft resin portion (fitting portion 62) and the hard resin portion are joined, an uneven fitting structure 63 along the axial direction is formed. The same applies to the fact that the three protrusions 64 shown in the figure extending over the entire circumference are formed on the inner peripheral surface of the distal end portion of the fitting portion 62 at intervals in the axial direction.
In addition, a reinforcing material 77 made of a hard resin having a cross shape is passed between the positions close to the base side of both connection ports 72 and 73, and the whole is reinforced.

  Next, the manufacturing procedure will be described. First, the connection port 52 with the flanges 54 and 55 in the first elbow 50 is attached to the opening 41 of the inner box 11. For this purpose, from the state shown in FIG. 4, the elbow 50 is rotated in the clockwise direction when viewed from the front, and the front flange 54 is set in the rotation posture corresponding to the notch hole 43. Next, after passing the front flange 54 through the cutout hole 43, when the elbow 50 is rotated counterclockwise as viewed from the front, the front flange 54 wraps around the front edge 42 and is turned into FIG. As shown, the rotation is restricted when the stopper 56 hits the edge of the cutout hole 43. As a result, the elbow 50 is in a posture in which the lower connection port 53 faces directly downward, and as shown in FIG. 5, the two ridges 58 in the contact portion 57 of the back flange 55 are elastically crushed, The opening 41 is attached while being prevented from coming off in close contact with the entire outer periphery of the lip 42.

Next, the first drain pipe 35 has a predetermined orientation along the inner box 11, and the upper end thereof is inserted into the downward connection port 53 of the first elbow 50 from below. The upper end of the drainage pipe 35 is inserted while elastically expanding the tip end side of the fitting portion 62, and is inserted into an annular insertion groove 68 between the inner cylinder 60 and the outer cylinder 61. The three protrusions 58 of the fitting portion 62 are elastically brought into close contact with the outer peripheral surface of the drainage pipe 35, whereby the seal is taken.
When the upper end of the drain pipe 35 is inserted, it comes into sliding contact with the inner peripheral surface on the distal end side of the fitting portion 62, but does not hit the inner peripheral surface but has three protrusions formed there. Since it is in sliding contact with the strip 64, the frictional resistance is small, and since the front side of the projection 64 is the inclined surface 65, it can be smoothly inserted. On the other hand, after being inserted, the protrusion 64 acts like a wedge in the direction in which the drain pipe 35 is pulled out, and contributes to prevention of removal.

  When the first elbow 50 is attached, if the lower connection port 53 is swung to the left or right from a posture in which the first elbow 50 is directed downward, the axes of the drainage pipes 35 are shifted when the upper end of the drain pipe 35 is inserted. It will be. In this respect, in this embodiment, since the elbow 50 is positioned and attached in a posture in which the lower connection port 53 faces directly downward, the upper end of the drain pipe 35 can be fitted with its axis line aligned. . As a result, the protrusion 64 in the fitting portion 62 of the elbow 50 is in close contact with the upper end of the drain pipe 35 evenly over the entire circumference.

Next, with respect to the lower end of the first drain pipe 35 facing obliquely downward, the second elbow 70 is set in a predetermined posture, and one of the connection ports 72 is inserted as shown in FIG. Similarly, the lower end of the drain pipe 35 is inserted while elastically expanding the distal end side of the fitting portion 62 and is inserted into an annular insertion groove 68 between the inner cylinder 60 and the outer cylinder 61. The three protrusions 64 of the fitting portion 62 are elastically brought into close contact with the outer peripheral surface of the drainage pipe 35 so that a seal is taken, and the drainage pipe 35 is inserted smoothly.
Subsequently, the upper end of the second drain pipe 36 facing obliquely upward is inserted into the other connection port 73 of the second elbow 70. Similarly, it is inserted while elastically expanding the front end side of the fitting portion 62, closely fitted to the inner periphery of the base of the cylindrical body 75, and hits the back stepped portion 76 to stop pushing. The three protrusions 64 of the fitting portion 62 are elastically brought into close contact with the outer peripheral surface of the drainage pipe 36 to provide a seal, and the drainage pipe 36 is inserted smoothly.
The lower end of the second drain pipe 36 is connected to the drain port 37.

When the piping of the first and second drain pipes 35 and 36 is completed in this way, the outer box 12 is fitted to the outside of the inner box 11 with a predetermined interval, and the foamed urethane is placed between the boxes 11 and 12. A heat insulating material 13 made of foamed resin such as resin is filled with foam.
At this time, in the portion where the entrance 34 is formed, the mouth edge portion 42 of the opening 41 of the inner box 11 is provided between the front and back flanges 54 and 55 made of hard resin and strong on the back flange 55. Since the ridge 58 of the contact portion 57 made of soft resin is applied, the ridge 58 is in close contact with the entire periphery of the rear edge portion 42 and is sealed. Therefore, the heat insulating material 13 is prevented from entering the front side of the opening 41 and further into the inlet 34.
Further, at the portion where the upper end of the first drain pipe 35 is fitted into the connection port 53 of the elbow 50, the end of the drain pipe 35 is sandwiched between the inner cylinder 60 and the outer cylinder 61 which are made of hard resin and are strong. After being firmly attached, the protrusion 64 of the soft resin fitting portion 62 provided on the outer cylinder 61 is fitted, so that it adheres well to the entire circumference of the end portion of the drain pipe 35. The seal is taken. Therefore, the heat insulating material 13 is prevented from entering the drain pipe 35.

Regarding the bent portion of the drainage channel 33, the portion where the lower end portion of the first drainage pipe 35 is fitted to the connection port 72 of the second elbow 70 is the same as the fitting portion of the upper end portion of the drainage pipe 35. Sealed.
In the portion where the upper end of the second drain pipe 36 is fitted to the connection port 73 of the elbow 50, the upper end part of the drain pipe 36 is tightly fitted in the rigid resin base end portion made of hard resin in the cylindrical body 75. The protrusion 64 of the fitting portion 62 on the distal end side is brought into close contact with the entire circumference of the drain pipe 36 and sealed. Therefore, it is possible to prevent the heat insulating material 13 from entering the drain pipes 35 and 36 even at both the connection ports 72 and 73.

For example, at the connection port 53 of the first elbow 50, when the foamed resin as the heat insulating material 13 is foam-filled, as shown by the arrow x in FIG. There is a risk of flowing into the interior while widening the edge. However, foamed resins such as foamed urethane resins tend to partially foam and harden when there is a volume change in the flow path and pressure changes in that part.
In that regard, since the three protrusions 64 are formed on the inner peripheral surface of the distal end portion of the fitting portion 62 with a gap 67 therebetween, when the foamed resin flows into the gap 67, It foams and hardens, and the inflow of further foamed resin is surely prevented.

The same effects as described above can also be obtained at the connection ports 72 and 73 of the second elbow 70.
Further, even on the side of the first elbow 50 where the inlet 34 is formed, the two protrusions 58 are formed on the surface of the tip portion of the contact portion 57 of the back flange 55 with a gap 59 therebetween. Similarly, as indicated by an arrow y in FIG. 5, when the foamed resin flows in while rolling the leading edge of the contact portion 57, the foamed foam is cured in the gap 59, and the foamed resin further flows in. Is definitely prevented.

  As described above, the first and second drain pipes 35 and 36 are embedded in the heat insulating material 13 on the wall surface of the main body 10 to form the drain channel 33, and the drain port of the drain pan 26 is connected to the inlet 34 of the drain channel 33. 38 is inserted. Therefore, the defrost water received by the drain pan 26 at the time of the defrosting operation or the like flows into the inlet 34 from the drain port 38, and then flows down the drain channel 33 and is discharged outside the warehouse. Here, the contact portion 57 or the fitting portion 62 made of a soft resin is in close contact with and sealed at the connection portion between the formation portion of the inlet 34, the elbows 50 and 70, and the drain pipes 35 and 36. There is no leakage.

  As described above, in this embodiment, the elbow 50 or 70 is applied to the fitting portion 62 fitted to the peripheral surface of the end portion of the drain pipe 35 or 36 or the mouth edge portion 42 of the opening 41 of the inner box 11. Since the abutting portion 57 is formed of a soft resin rich in flexibility, the seal is taken in close contact with the other party. For this reason, it is possible to prevent the foamed resin from invading at the time of manufacture and the leakage of defrost water at the time of use. In particular, since it is not necessary to apply special weathering at the time of manufacturing, the operation is simplified, and the manufacturing cost can be reduced.

More specifically, in the portion where the end portions of the drain pipes 35, 36 are connected to the connection ports 53, 72, 73 of the elbows 50, 70, the end portions of the drain pipes 35, 36 are made of hard resin and have a strong waist. It is firmly positioned and connected by being fitted into the heavy cylinders 60 and 61 or in the cylindrical body 75 made of the same hard resin, and the flexible fitting part 62 is an end of the drain pipes 35 and 36 thereon. Therefore, the fitting portion 62 is securely adhered over the entire circumference, and the sealing performance is high.
On the other hand, in the portion where the inlet 34 is formed, the connection port 52 of the elbow 50 is firmly positioned by sandwiching the mouth edge portion 42 of the opening 41 of the inner box 11 from the front and back by the rigid flanges 54 and 55 made of hard resin. Attached. In addition, since the flexible contact portion 57 is applied to the mouth edge portion 42 on the back side, it can be satisfactorily adhered over the entire periphery of the mouth edge portion 42 and the same high sealing performance can be obtained.

  Since the three protrusions 64 are formed on the fitting surface of the fitting portion 62 with the drain pipes 35 and 36, the frictional resistance when fitting the ends of the drain pipes 35 and 36 is kept small. Therefore, the fitting operation can be performed smoothly. Further, when the protrusions 64 are provided, when the foamed resin tries to flow into the fitting surface side of the fitting portion 62, the foamed resin is formed in the gap 67 between the protrusions 64 by using the property of the foamed resin. Can be partially foamed and cured. Therefore, the inflow of the foamed resin beyond that can be prevented, that is, the intrusion into the drain pipes 35 and 36 can be prevented.

In addition, since the two protrusions 58 are also formed on the contact portion 57, when the foamed resin is about to flow into the contact surface side of the contact portion 57, the gap between the protrusions 58 is the same. At 59, the foamed resin is foamed and solidified, and further inflow is prevented. This prevents the foamed resin from entering the inlet 34.
In both elbows 50 and 70, since the hard resin portion and the soft resin portion are integrally formed by two-color molding, leakage from the joint is prevented. In addition, since only one part is required, management is simplified and the handling is excellent.

<Embodiment 2>
FIG. 9 shows an elbow 80 (corresponding to the pipe joint of the present application) according to the second embodiment. The elbow 80 is disposed at a bent portion of the drainage channel 33 and should be referred to as a modified example in which the structure of the connection port is changed.
In the upward connection port 82, an expanded soft resin fitting portion 62 is formed at the tip of the upward cylindrical portion 81A of the main body portion 81 made of hard resin, and three ridges are formed on the inner peripheral surface thereof. 64 are formed at intervals. The lower end portion of the counterpart drain pipe 35 is fitted into the fitting portion 62 while collapsing the protrusion 64 and is received by hitting the stepped portion 84.
The flexible protrusion 64 adheres well to the outer peripheral surface of the lower end portion of the drain pipe 35, and a good seal is taken. In particular, although the hard resin part which fits the lower end part of the drain pipe 35 is not provided, in the drain pipe 35 which faced the up-down direction, it can fully position only by receiving the lower end part.

On the other hand, in the right-facing connection port 83, three soft resin protrusions 64 are formed at intervals on the outer peripheral surface of the right-pointing cylindrical portion 81B of the main body portion 81 made of hard resin. Further, on the back side of the ridge 64, a soft resin ridge 85 having a cross-sectional ridge shape that abuts the end surface of the drain pipe 36 and covers the outer peripheral surface of the end portion is formed. After the end of the drain pipe 36 is firmly fitted to the outer periphery of the cylindrical portion 81B made of hard resin, the flexible protrusion 64 is in close contact with the entire periphery of the outer peripheral surface, and the bowl-shaped rod 85 hits the end surface. Sealed well.
Since both of the connection ports 82 and 83 are formed with three ridges 64 shown in the figure, when the foamed resin is about to flow in, the gap 67 between the ridges 64 is partially applied as described above. It foams and hardens, and further inflow of foamed resin is prevented.

<Embodiment 3>
FIG. 10 shows Embodiment 3 of the present invention. The elbow 90 (corresponding to the pipe joint of the present application) of this embodiment is arranged at a portion where the inlet 34 is formed. In this elbow 90, a contact portion 91 that contacts the rim portion 42 of the opening 41 of the inner box 11 and a fitting portion 92 to which the end of the drain pipe 35 is fitted are formed of a soft resin. However, it is formed separately from the main body 51 made of hard resin, and is detachable from the main body 51.
For example, as shown in the fitting portion 92A, when the pipe diameter of the drain pipe to be connected is changed by preparing a plurality of types of fitting portions having different diameters, the fitting portion is replaced. Just do it.

<Other embodiments>
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention, and further, within the scope not departing from the gist of the invention other than the following. Various modifications can be made.
(1) The structure of the connection port of the elbow can be changed in addition to those exemplified in the above embodiment. For example, in the connection port constituting the inlet of the drainage channel, the back flange itself may be formed of a hard resin, and only the protrusions may be formed of a soft resin. Further, the entire back flange including the protrusions may be made of a soft resin.
(2) The present invention is not limited to the elbow shown in the above embodiment, but can be widely applied to other types of pipe joints such as bends and straight types.

(3) The drainage path of the defrost water is not limited to the one exemplified in the above embodiment, and as long as it passes through the wall surface of the heat insulation box, which wall surface is passed in what order and direction can be arbitrarily set. .
(4) The present invention is not limited to a refrigerator, but a freezer, quick freezer, etc., in summary, by passing the defrosted water drainage path from the cooler through the wall surface of the heat insulating box while connecting the drainage pipe with a pipe joint. It can be widely applied to all formed products.

The longitudinal cross-sectional view of the refrigerator which concerns on Embodiment 1 of this invention Cross section of the first elbow Front view Exploded perspective view showing mounting structure of first elbow Sectional drawing before the filling of the heat insulating material in the arrangement | positioning part of a 1st elbow Sectional view after filling the insulation Cross section of second elbow Sectional view with drain pipe connected to second elbow Sectional drawing of the elbow concerning Embodiment 2 Sectional drawing of the elbow concerning Embodiment 3

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Refrigerator main body 11 ... Inner box 12 ... Outer box 13 ... Heat insulation material (foamed resin) 26 ... Drain pan 30 ... Cooler 33 ... Drainage channel 34 ... Inlet 35, 36 ... Drain pipe 38 ... Drain port 41 ... Opening 42 ... Mouth Edge 43 ... Notch hole 50 ... Elbow (pipe joint) 51 ... Main body 52, 53 ... Connection port 54 ... Front flange 55 ... Back flange 56 ... Stopper 57 ... Abutment 58 ... Projection 59 ... Clearance 60 ... Inner cylinder 61 ... outer cylinder 62 ... fitting part 64 ... protrusion 67 ... gap 70 ... elbow (pipe joint) 71 ... main body part 72, 73 ... connection port 75 ... cylindrical body 80 ... elbow (pipe joint) 81 ... main body part 81B ... Tube portion 82, 83 ... Connection port 90 ... Elbow (pipe joint) 91 ... Main body portion 92, 92A ... Fitting portion

Claims (7)

The storage body is formed by a heat insulating box filled with a heat insulating material made of foamed resin between the inner box and the outer box, and defrost water from a cooler that cools the inside of the box is embedded in the heat insulating material of the main body. In a cooling storage that is discharged to the outside through the drain pipe, a pipe joint is connected to the end of the drain pipe or an opening formed in the inner box as an entrance to the drain pipe. And
The main body portion of the pipe joint is formed of a hard resin, and is applied to a fitting portion fitted to a peripheral surface of an end portion of the drain pipe in the pipe joint or an opening edge portion of the inner box. A pipe joint connection structure for a cooling storage, wherein the contact portion is formed of a soft resin. 2. The cooling according to claim 1, wherein the pipe joint is provided with a cylindrical body made of a hard resin that is fitted to an end of the drain pipe, and the fitting part is provided in the cylindrical body. Pipe joint structure for storage. The cylindrical body is formed as a double cylinder that is fitted and sandwiched between an inner circumference and an outer circumference of the drain pipe, and the fitting section is provided in either the inner or outer cylinder section. The pipe joint connection structure of the cooling storage according to 2. The pipe joint is formed with a hard resin double flange that holds the opening edge of the inner box from both the front and back sides, and the abutment is provided on either the front or back flange. The pipe joint connection structure for a cooling storage as claimed in claim 1. On the peripheral surface to be fitted with the peripheral surface of the drain pipe in the fitting portion, ridges extending over the entire circumference are formed at intervals in a plurality of axial directions, or the fitting portion itself is formed in the cylindrical body. The cooling storage according to any one of claims 1 to 3, wherein a plurality of ridges are formed on the circumferential surface opposite to the circumferential surface of the drain pipe at intervals in the axial direction. Pipe joint connection structure. A plurality of protrusions having different diameters are formed concentrically at intervals on the surface of the contact portion that is applied to the mouth edge of the opening of the inner box, or the contact portion itself is 5. The plurality of protrusions having different diameters formed concentrically at intervals in the radial direction on a surface of the flange facing the rim portion of the opening. Pipe joint connection structure of the cooling storage. A notch hole is formed in the opening edge of the opening of the inner box, the front flange is formed as a partial flange that matches the notch hole, and the abutting portion is provided on the back flange, By rotating the front flange after passing through the notch hole, the contact portion provided on the back flange is prevented from coming off in a state of being in close contact with the edge of the back side of the opening, and the front flange The pipe joint connection structure for a cooling storage according to claim 4 or 6, further comprising a stopper for restricting rotation by hitting an edge of the notch hole.

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