JP2006098002A - Freezer-refrigerator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To realize a freezer-refrigerator provided with a cooler for a refrigerating chamber and a cooler for a freezing chamber in parallel to selectively supply a refrigerant, with simple constitution. <P>SOLUTION: This freezer-refrigerator is provided with the cooler 10 for the refrigerating chamber which cools the refrigerating chamber 2 and has no header; the cooler 11 for the refrigerating chamber which cools the refrigerating chamber 3 and has a header 12 at the upper part; a refrigerant passage switching means 7 for selectively supplying a refrigerant only to the cooler 10 for the refrigerating chamber, only to the cooler 11 for the freezing chamber, and to both coolers 10, 11; a defrosting heater 15 mounted to the lower part of the cooler 11 for the freezing chamber; and a control part for controlling the refrigerant passage switching means 7 according to the temperature of the refrigerating chamber 2 and freezing chamber 3 to supply the refrigerant to one of the coolers 10, 11 during normal cooling operation, and controlling the refrigerant passage switching means 7 to supply the refrigerant to both coolers 10, 11 immediately after the end of defrosting operation performed by the defrosting heater 15 of the cooler 11 for the freezing chamber. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a refrigerator-freezer in which two coolers, a refrigerator for a refrigerator compartment and a refrigerator for a freezer compartment, are arranged in parallel.

  Some refrigerator-freezers are provided with two coolers.

This refrigerator-freezer is provided with a freezer compartment cooler downstream of the refrigerating room cooler and a bypass passage for supplying refrigerant to the freezer compartment cooler without going through the refrigerating room cooler. (See Patent Document 1)
Further, as a type different from the refrigerator-freezer, there is a type in which a refrigerator for a refrigerator and a refrigerator for a freezer are provided in parallel to selectively supply a refrigerant. (See Patent Document 2)
Japanese Patent No. 3410408 Japanese Patent Laid-Open No. 2004-212046

  An object of the present invention is to realize the latter type of refrigerator-freezer with a simple configuration.

  That is, only one liquid reservoir for storing the refrigerant needs to be operated, but in this case, this liquid reservoir must be provided after the refrigerant flow paths from both coolers merge.

  The present application provides a refrigerator-freezer that has a single liquid reservoir and that operates well even before merging of refrigerant flow paths and does not require new parts to be newly developed for this purpose.

  The present invention cools the refrigerating room (2), the freezing room (3), the refrigerating room (2), the refrigerating room cooler (10) having no header, and the freezing room (3). And a freezer cooler (11) having a header (12) at the top, only the refrigerator freezer (10), only the freezer cooler (11), and both coolers. (10, 11) selectively supplying the refrigerant flow path switching means (7), the defrost heater (15) attached below the freezer cooler (11), and during the normal cooling operation, The refrigerant flow switching means (7) is controlled according to the temperature of the refrigerator compartment (2) and the freezer compartment (3) to supply the refrigerant to one of the coolers (10, 11), and the refrigeration Immediately after completion of the defrosting operation by the defrosting heater (15) of the room cooler (11), the refrigerant flow switching means (7) is controlled to supply the refrigerant to both coolers (10, 11). And a control unit.

  Furthermore, a check valve is not provided in the refrigerant flow path from the both coolers (10, 11) to the compressor (4) of the refrigerator-freezer.

  According to the refrigerator-freezer according to claim 1 of the present invention, since the header of the conventional cooler for a freezer with a header can be used as the only liquid reservoir in the refrigeration cycle, the refrigerator-freezer is realized with a simple configuration. it can.

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

  FIG. 1 shows a refrigerator (11) for a freezer compartment according to an embodiment. This cooler (11) is a cooler having a general shape that has been used conventionally, and a liquid reservoir (receiver, accumulator) called a header (12) is attached to the upper refrigerant path. In addition, a glass tube heater (15) for defrosting is disposed at the lower part of the cooler (11), and when frost is formed, the frost on the cooler (11) is melted by heating from the heater (15). Yes.

  FIG. 2 is a conceptual diagram of the refrigerator-freezer of this embodiment.

  The refrigerator-freezer (1) includes a freezer compartment (3) and a refrigerator compartment (2) that are formed in a heat insulating box and partitioned by a heat insulating partition. A machine room is provided at the bottom of the refrigerator-freezer (1), and a compressor (4), a condenser (5), a condenser cooling fan (6), and a three-way switching valve (7) are provided. .

  In order to cool the refrigerating room (2), a capillary tube (8), a refrigerating room cooler (10), and a refrigerating room fan (13) are provided. In addition, since the defrosting of this cooler (10) is performed by cycle defrost, no heater is provided. That is, at the time of defrosting, the internal air is cooled by frosting by rotating the fan (13) without flowing the refrigerant, and at the same time defrosting is performed.

  In order to cool the freezer compartment (3), a capillary tube (9), a freezer cooler (11), a freezer fan (14), and a header (12) are provided. The defrosting of the freezer cooler (11) is performed by the heater (15).

  In this refrigerator-freezer, a check valve is not provided in the refrigerant flow path from the both coolers (10, 11) to the compressor (4). Further, the refrigerant liquid reservoir provided in the refrigerant flow path from both the coolers (10, 11) to the compressor (4) is only the header (12).

  The refrigerator-freezer (1) will be described.

  During the cooling operation, the compressor (4) is operated, and the refrigerant is compressed and supplied to the condenser (5). The fan (6) operates and the refrigerant in the condenser (5) is cooled. Then, the refrigerant is supplied to a three-way switching valve (7) that is a refrigerant flow path switching means.

  The three-way switching valve (7) is controlled by a control unit (not shown), and selectively outputs the refrigerant to the side that needs to be cooled at that time. For example, if the temperature of the freezer compartment (3) is sufficiently cooled, but the temperature of the refrigerator compartment (2) has risen, the control unit detects this as a freezer compartment temperature sensor (not shown). The compressor (4), the fan (6), and the fan (13) are turned on, and the three-way switching valve (7) is opened to the refrigerator compartment side.

 As a result, the refrigerant flows to the refrigerator compartment side and cools the refrigerator compartment (2). When the refrigerator compartment (2) is cooled to a predetermined temperature, the control unit stops the cooling operation.

  If the temperature of the refrigerator compartment (2) is sufficiently cooled, but the temperature of the freezer compartment (3) has risen, the controller will indicate this in the refrigerator compartment temperature sensor (not shown) refrigerator compartment. A determination is made based on the temperature detected by a temperature sensor (not shown), the compressor (4), the fan (6) and the fan (14) are turned on, and the three-way switching valve (7) is opened to the freezer compartment side.

 Thereby, the refrigerant flows to the freezer compartment side and cools the freezer compartment (3). When the freezer compartment (3) is cooled to a predetermined temperature, the control unit stops the cooling operation.

  In addition, the control unit integrates the time during which the refrigerant flows to the freezer compartment side, and defrosts the freezer compartment cooler (11) when the integrated value reaches a predetermined value. During this defrosting, the refrigerator is not cooled. The control unit energizes the heater (15) to heat the cooler (11). Defrosting is performed by this heating.

  After the defrosting, the refrigerant in the freezer cooler (11) and the header (12) is almost evaporated.

  Therefore, in the embodiment of the present application, in the cooling operation immediately after the end of the defrosting, the control unit turns on the compressor (4), the fan (6), the fan (13), the fan (14), and the three-way switching valve ( Open both outlets of 7) and supply refrigerant to both the freezer compartment side and the refrigerator compartment side.

  That is, if the refrigerant that has returned to the compressor or the like by defrosting is supplied to only one of the coolers, but not only to one of the coolers, there is a fear that the amount of refrigerant will be excessive and liquid back will occur. Therefore, in this embodiment, during the cooling operation immediately after the completion of defrosting, the refrigerant is supplied to both coolers (10, 11), and excess refrigerant is stored in the header (12) and both coolers (10, 11). I am doing so.

  The description of the above embodiment is for explaining the present invention, and does not limit the invention described in the claims or reduce the scope thereof. Moreover, each part structure of this invention is not restricted to the said embodiment, A various deformation | transformation is possible within the technical scope as described in a claim.

It is a perspective view of the cooler of the 1st example of the present invention. It is a conceptual diagram for demonstrating the cooling operation | movement of the refrigerator-freezer of 1st Example.

Explanation of symbols

(1) Freezer refrigerator
(2) Cold room
(3) Freezer room
(4) Compressor
(5) Condenser
(6) Condenser cooling fan
(7) Three-way switching valve (refrigerant channel switching means)
(8) Capillary tube
(9) Capillary tube
(10) Cold room cooler
(11) Freezer cooler
(12) Header (Liquid reservoir, receiver, accumulator)
(13) Cold room fan
(14) Freezer compartment fan
(15) Glass tube heater for defrosting

Claims (2)

Refrigerator compartment (2),
Freezer compartment (3),
The refrigerator (10) for cooling the refrigerator compartment (2) and having no header,
The freezer (3) cools the freezer cooler (11) provided with a header (12) at the top,
Only the cooler (10) for the refrigerator compartment, only the cooler for the freezer compartment (11), and a refrigerant flow switching means (7) for selectively supplying the both coolers (10, 11). ,
A defrosting heater (15) attached below the freezer cooler (11);
During normal cooling operation, the refrigerant flow switching means (7) is controlled according to the temperatures of the refrigerator compartment (2) and the freezer compartment (3) to supply refrigerant to one of the coolers (10, 11). Immediately after completion of the defrosting operation by the defrosting heater (15) of the freezer cooler (11), the refrigerant flow switching means (7) is controlled to supply both coolers (10, 11). And a control unit for supplying a refrigerant to the refrigerator-freezer.   The refrigerator-freezer according to claim 1, wherein a check valve is not provided in the refrigerant flow path from the both coolers (10, 11) to the compressor (4).

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