JPH06147703A - Evaporator for refrigerator - Google Patents

Abstract

PURPOSE:To prevent refrigerator temperature from being raised by preventing any frost from being left behind on the upper portion of an evaporator to promote the rotation of a cooling fan, and supplying cold air to the inside of a cooling device such as a refrigerator and the like to normally cool the device and shorten defrosting time. CONSTITUTION:An evaporator 13 includes a refrigerant pipe 2 bent in a zigzag line, a fin 1 inserted avoiding a zigzag part of the refrigerant pipe 2, an inlet pipe 11 having a smaller diameter than the diameter of the refrigerant pipe connected with an inlet side of the refrigerant pipe 2, an accumulator 5 connected with an outlet side of the refrigerant pipe 2, a suction pipe 12 connected with the outlet of the accumulator 5, and a defrosting completion detector device 14. The defrosting completion detector device 14 is fixed to the inlet pipe 11 and the suction pipe 12 in contact with the latters. Hereby, any frost is prevented from being left behind on the upper portion of the evaporator 13 to promote the rotation of the cooling fan 9 for normal cooling, and defrosting time is shortened to prevent temperature in the refrigerator from being raised.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to improvements in evaporators for refrigerators used in refrigerators and the like.

[0002]

2. Description of the Related Art A conventional evaporator for a refrigerator used in a refrigerator or the like will be described with reference to FIG. 1 is a fin, 2 is a refrigerant pipe bent in a meandering shape, and 3 is a side plate. Reference numeral 4 is an inlet pipe connected to the inlet side of the refrigerant pipe and having a diameter smaller than that of the refrigerant pipe. Reference numeral 5 is an accumulator for temporarily storing excess liquid refrigerant. Reference numeral 6 is a suction pipe connected to the outlet of the accumulator 5. In the evaporator 7, the fin 1 is inserted while avoiding the curved pipe portion of the refrigerant pipe 2 which is bent, and the refrigerant pipe 2 is expanded to securely fix the fin 1 and the refrigerant pipe 2 to each other. The inlet pipe 4 on the side,
The accumulator 5 is connected to the outlet side, and 8 is a defrosting completion sensing element, which is attached via a heat sensitive plate 8a so as to come into contact with the uppermost portion of the fin 1 of the evaporator 7.

Further, the airflow inflow side A is installed inside a refrigerator or the like so that it is located at the bottom. 9 is a cooling fan, and 7 is an evaporator.
And near the upper part of the inlet pipe 4 and the suction pipe 6,
The cooling fan is rotated and the cool air is sent to the inside of a refrigerator or the like for cooling. Reference numeral 10 denotes a defrosting heater, which is provided below the evaporator 7 to periodically generate heat from the defrosting heater to defrost the frost adhering to the evaporator 7 by radiant heat.

[0004]

In the evaporator for a refrigerator configured as described above, when defrosting, heat is removed by heat conduction by the fins 1 and the refrigerant pipes 2 or heat transfer by the refrigerant movement in the refrigerant pipes 2. Although frost is generated, only the uppermost portion of the fin 1 to which the defrosting completion detecting element is attached is defrosted, so that frost residue is generated in the inlet pipe 4, the accumulator 5, and the suction pipe 6 at each defrosting. There is a problem that frost grows and finally the rotation of the cooling fan is obstructed and fixed, so that cold air cannot be sent to the inside of a refrigerator or the like, resulting in poor cooling.

The present invention is intended to solve the above-mentioned problems, and detects the temperature of the inlet pipe and the suction pipe during defrosting to finish defrosting, and further pipes in proximity to the notch of the uppermost fin to transfer heat. By improving the above, it is possible to provide an evaporator that prevents frost residue from the inlet pipe, accumulator, and intake pipe, does not hinder the rotation of the cooling fan, shortens the defrosting time, and suppresses the rise in the internal temperature. is there.

[0006]

In order to solve the above problems, an evaporator for a refrigerator of the present invention comprises a refrigerant pipe bent in a meandering shape,
A fin that avoids the meandering portion of the refrigerant pipe, an inlet pipe having a diameter smaller than the diameter of the refrigerant pipe connected to the inlet side of the refrigerant pipe, an accumulator on the outlet side of the refrigerant pipe, and a suction pipe connected to the outlet of the accumulator, With a defrosting completion sensing element,
The defrosting completion detecting element is fixed in contact with the fin, the inlet pipe and the suction pipe to prevent residual frost and prevent the cooling fan from rotating.

Further, the inlet pipe and the suction pipe are arranged in the notch of the uppermost fin in close proximity to each other to prevent residual frost and prevent rotation of the cooling fan.

[0008]

With the above-described structure, the evaporator for a refrigerator of the present invention prevents frost residue on the upper part of the evaporator, does not hinder the rotation of the cooling fan, and sends cold air to the inside of a refrigerator or the like for normal cooling. In addition, the defrosting time can be shortened and the rise in the temperature inside the refrigerator can be suppressed.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of a refrigerator evaporator according to the present invention will be described below with reference to the drawings. It should be noted that the same components as those of the related art are designated by the same reference numerals and detailed description thereof will be omitted.

FIG. 1 is a front view showing the structure of the first embodiment of the refrigerator evaporator of the present invention. FIG. 2 is a vertical cross-sectional view of the refrigerator evaporator of the embodiment.

In FIGS. 1 and 2, 1 is a fin, 2 is a refrigerant pipe bent in a meandering shape, and 3 is a side plate. Reference numeral 11 is an inlet pipe connected to the inlet side of the refrigerant pipe and having a diameter smaller than that of the refrigerant pipe, 5 is an accumulator for temporarily storing excess liquid refrigerant, and 12 is a suction pipe connected to the outlet of the accumulator 5. In the evaporator 13, the fin 1 is inserted while avoiding the curved pipe portion of the refrigerant pipe 2 which is bent in a meandering manner, the refrigerant pipe 2 is expanded to securely fix the fin 1 and the refrigerant pipe 2, and the inlet of the refrigerant pipe 2 is inserted. The inlet pipe 11 on the side of the accumulator 5 and the suction pipe 12 on the side of the outlet.
And is installed inside a refrigerator or the like with the airflow inflow side A facing downward. 14 is a defrosting completion sensing element,
The uppermost fin 1 of the evaporator 13 and the inlet pipe 11 and the suction pipe 12 are attached in contact with each other via the heat-sensitive plate 14a. A cooling fan 9 is provided in the vicinity of the upper part of the evaporator 13, the inlet pipe 11 and the suction pipe 12.
A defrosting heater 10 is provided below the evaporator 13.

The operation of the evaporator for a refrigerator constructed as described above will be described below. When a refrigerating cycle (not shown) is activated and enters a cooling operation state, the evaporator 13 is ventilated with air containing steam, so that the moisture of the air adheres to the surface of the evaporator 13 as frost. Come to do.
To reduce the heat exchange efficiency of the evaporator 13 due to frost, it is necessary to defrost periodically.

During defrosting, when the defrosting heater 10 is energized, the lower part of the evaporator 13 is heated by its radiant heat, and the frost adhering to it gradually melts upward. The heat transfer from the lower part to the upper part of the evaporator 13 at this time is mainly the heat transfer by the fins 1 and the refrigerant tubes 2 and the heat transfer by the refrigerant movement in the refrigerant tubes 2. Explaining the heat transfer due to the refrigerant transfer, the liquid refrigerant inside the evaporator 13 is heated and evaporated. The evaporator 13 becomes two heat pipes, and the evaporated refrigerant vapor rises to the upper part of the evaporator 13 to defrost the frost adhering to the surface of the evaporator 13.

The fins 1 of the evaporator 13 and the inlet pipe 11
The defrosting of the suction pipe 12 is performed until the end is detected by the defrosting completion detecting element 14, and the remaining frost is eliminated so that the rotation of the cooling fan is not always hindered and the cool air is normally sent to the inside of the refrigerator or the like. be able to.

Next, the second embodiment of the refrigerator evaporator according to the present invention
Embodiments will be described with reference to the drawings. The same components as those in the first embodiment are designated by the same reference numerals and detailed description thereof will be omitted.

FIG. 3 is a front view showing the structure of the second embodiment of the refrigerator evaporator of the present invention. FIG. 4 is a vertical cross-sectional view of the refrigerator evaporator of the embodiment.

In FIGS. 3 and 4, reference numeral 15 is a fin having a notch at the uppermost portion, which is an inlet pipe 11 and a suction pipe 12.
Is separated from the cooling fan and is arranged in the fin notch of the evaporator body so as to be in close proximity thereto. In this embodiment, the evaporator for a refrigerator of the first embodiment is further provided with a fin 15 having a notch at the uppermost portion.

The operation of the refrigerator evaporator having the above-described structure will be described below. At the time of defrosting, the inlet pipe 11 and the suction pipe 12 are subjected to heat transfer from the fins 15 adjacent to each other to promote defrosting, and thus the defrosting time can be shortened and an increase in the temperature inside the warehouse can be suppressed.

[0019]

As described above, according to the present invention, a refrigerant pipe bent in a meandering shape, and a fin for avoiding the meandering portion of the refrigerant pipe to be inserted.
An inlet pipe connected to the inlet side of the refrigerant pipe, an accumulator on the outlet side of the refrigerant pipe, a suction pipe connected to the outlet of the accumulator, and a defrosting completion sensing element are provided. This is for fixing the elements in contact, and furthermore, because the inlet pipe and the suction pipe are piped close to the notch of the uppermost fin, frost residue on the upper part of the evaporator is prevented and the cooling fan of the cooling fan is prevented. Without disturbing the rotation, cold air can be sent to the inside of the refrigerator or the like to be cooled normally, and the defrosting time can be shortened to suppress the rise in the inside temperature.

[Brief description of drawings]

FIG. 1 is a front view showing a structure of a first embodiment of a refrigerator evaporator of the present invention.

FIG. 2 is a vertical cross-sectional view of a refrigerator evaporator of the same embodiment.

FIG. 3 is a front view showing the structure of the second embodiment of the refrigerator evaporator of the present invention.

FIG. 4 is a vertical cross-sectional view of the refrigerator evaporator of the same embodiment.

FIG. 5 is a front view showing the structure of a conventional evaporator for a refrigerator.

[Explanation of symbols]

 1 Fin 2 Refrigerant Pipe 5 Accumulator 11 Inlet Pipe 12 Suction Pipe 14 Defrost Completion Sensing Element

Claims (2)

[Claims] 1. A refrigerant pipe bent in a meandering shape, fins for avoiding the meandering portion of the refrigerant pipe, an inlet pipe having a diameter smaller than a diameter of the refrigerant pipe connected to an inlet side of the refrigerant pipe, and an outlet side of the refrigerant pipe. An evaporator for a refrigerator, comprising: an accumulator, an intake pipe connected to an outlet of the accumulator, and a defrosting completion sensing element, and fixing the defrosting completion sensing element to the fin, the inlet pipe, and the suction pipe. . 2. The evaporator for a refrigerator according to claim 1, wherein the inlet pipe and the suction pipe are arranged adjacent to each other in the cutout portion of the uppermost fin.