JPS6124859Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a refrigerator in which cold air is forcedly circulated inside the refrigerator using an electric blower. To provide a cooling device that can maintain the cooling effect of internal air and reduce the number of times of defrosting.

In order to achieve this purpose, the present invention provides a cooling chamber between the ceiling surface of the refrigerator and a partition plate installed below it. An outer refrigerant pipe and an inner refrigerant pipe each having a large number of protruding fins are arranged approximately concentrically, and air is introduced into the refrigerator below through an opening formed in the partition plate located approximately at the center of the refrigerant pipe. An electric blower is provided to send out cold air, the cooler chamber has a cold air suction part over the entire circumference or most of the circumference, and the coil spacing of the outer refrigerant pipe is formed to be coarser than the coil spacing of the inner refrigerant pipe. It has a similar structure.

Next, an embodiment of the present invention will be explained based on the drawings. Reference numeral 1 denotes a refrigerator body, which is a box body with an opening at the front, which is constructed by filling a heat insulating material 4 between an inner box 2 and an outer box 3. Reference numeral 5 denotes a heat insulating door that opens and closes the front opening of the refrigerator body 1.
Reference numeral 6 denotes a partition plate installed at the upper part of the refrigerator so as to form a cooler chamber 7 between the partition plate and the ceiling surface of the refrigerator, and is fixed to the ceiling wall of the refrigerator with a support plate 8. Reference numerals 9A and 9B are refrigerant pipes, that is, coolers used in the refrigeration cycle, and each is wound into a coil and installed in the cooler chamber 7 in a concentric arrangement, and each has a large number of needles protruding toward the inside of the coil. Refrigerant flows from the inner refrigerant pipe 9A to the outer refrigerant pipe 9B and returns from the accumulator 11 to the electric compressor.
Also, the coil spacing of the outer refrigerant pipe 9B is the same as that of the inner refrigerant pipe 9.
It is wider and roughly formed than the coil spacing of A. A cold air suction portion is formed over most of the entire circumference or the area excluding the support plate 8 of the cooler chamber 7 . Reference numeral 12 denotes a propeller-type blower including an electric motor 12A, which sends air from the cooler chamber 7 downward into the refrigerator through a central opening 13 formed in the partition plate 6 and located approximately at the center of the refrigerant pipes 9A and 9B. . The partition plate 6 is circularly recessed downward in the middle part to serve as a dew pan.
A glass tube defrosting heater 14 is arranged in a circular shape corresponding to the middle part of the heater 9B.

In this configuration, when the electric blower 12 is operated, the air inside the refrigerator is circulated as shown by the arrow, dehumidified by the outer refrigerant pipe 9B, and sufficiently cooled by the inner refrigerant pipe 9A. Since the outer refrigerant pipe 9B has a coarse pitch and air is sucked in from all or most of the cooling chamber, clogging due to frost formation is less likely to occur, and the number of times of defrosting can be reduced. In particular, air flowing from the radial direction to the blower 12 flows smoothly with little flow resistance through the concentric refrigerant pipes 9A and 9B, and a small input motor 12A of the blower 12 is sufficient. In addition, since air can be sucked into the cooler chamber 7 from all or most of its circumference, the air circulation inside the refrigerator is improved. This is preferable since low-temperature cold air does not directly impinge on the heat insulating door and prevents dew from forming on the front opening of the refrigerator body. Furthermore, during defrosting, warm air accumulates around the cooler, reducing convection into the refrigerator and suppressing a rise in temperature inside the refrigerator. In addition, by arranging the accumulator 11 on the outside of the cooler as shown in the figure, the heat-exchanged air inside the refrigerator passes through this area, promoting the vaporization of the low-temperature liquid refrigerant accumulated in the accumulator 11. This is preferable in terms of preventing return. Further, as shown in the figure, by arranging the inner refrigerant pipe 9A so that a lower temperature refrigerant flows than the outer refrigerant pipe 9B, low-temperature cold air can be effectively delivered into the refrigerator.

As mentioned above, the present invention has an inner refrigerant pipe and an outer refrigerant pipe arranged approximately concentrically, the blower is located in the center of the refrigerant pipe, and the outer refrigerant pipe has a coarser pitch than the inner refrigerant pipe, so that Air is sucked in from around the outer coil and has little flow resistance, achieving smooth circulation that can flow down to the middle part of the refrigerator even with a small blower, and suppressing dew formation on the front opening of the refrigerator. Furthermore, clogging of the cooler due to frost formation is less likely to occur, and the number of times of defrosting can be reduced, which is preferable in terms of cooling efficiency.

[Brief explanation of the drawing]

Each figure shows an embodiment of the present invention. Figure 1 is a longitudinal cross-sectional side view of the central part of the refrigerator, Figure 2 is an enlarged view of the upper part of the interior of Figure 1, and Figure 3 is a plan view showing the arrangement of refrigerant pipes. FIG. 4 is an enlarged cross-sectional view of the refrigerant pipe. 1...Refrigerator body, 6...Partition plate, 7...Cooler chamber, 9A...Inner refrigerant pipe, 9B...Outer refrigerant pipe, 10...Fin, 12...Blower, 13...
Opening of partition plate.

Claims (1)

[Scope of utility model registration request] A cooler chamber is provided between the ceiling surface of the refrigerator interior and a partition plate provided below the refrigerator chamber, and inside the cooler chamber there is an outer side having a large number of fins each wound in a coil shape and protruding toward the inside of the coil. A refrigerant pipe and an inner refrigerant pipe are arranged substantially concentrically, and an electric blower is provided so as to send air into the refrigerator below through an opening formed in the partition plate and located substantially in the center of the refrigerant pipe, In the refrigerator, the cooler chamber has a cold air suction portion over the entire or most of the periphery, and the outer refrigerant pipe has a coil spacing that is coarser than the inner refrigerant pipe.