JP2007113800A - Refrigerator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a refrigerator of high mounting work efficiency by improving constitution and layout of piped components even in a narrow space such as a machine room having a number of components and an interior depth portion. <P>SOLUTION: In this refrigerator 1 provided with a cooler 14 for freezing and a cooler 13 for refrigerating respectively exclusively cooling freezing and refrigerating storage spaces, a heat insulating material is foamed and packed in such a state that a suction pipe assembly 29 constituted by integrating a connection pipe A31 comprising a throttle device 26 connected with an inlet pipe of the cooler for freezing, and an accumulator 27 connected with an outlet pipe 14a, a connection pipe B32 connected with a throttle device 25 connected with the cooler for refrigerating, and an outlet pipe 13a, and a suction pipe 30 for joining the connection pipe A and the connection pipe B and connected with its downstream side, is disposed on an inner case back face, and then the suction pipe assembly and the coolers for freezing and refrigerating are connected inside of the refrigerator. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a refrigerator having a refrigerated storage space and a refrigerated storage space, and a refrigerator provided with a dedicated cooling device, and more particularly to a refrigerator having an improved arrangement structure such as a refrigerant pipe around the cooler.

  In recent refrigerators, as shown in the longitudinal sectional view of FIG. 11, the most frequently used and large-capacity refrigeration room (55) is arranged at the top, and the ice making room (56) and temperature switching not shown below. There is a type in which a room is placed side by side, a vegetable storage room (58) that is a refrigerated storage space similar to the refrigeration room (55) and stores vegetables, and a freezer room (59) is placed at the bottom. The refrigerator compartment (55) has a front door closed with a rotary door, and the vegetable compartment (58), ice making compartment (56), temperature switching compartment, freezer compartment (59) is a drawer. It can be pulled out forward by a type door, container, and rail.

  A refrigeration cooler (63) and a fan (65) for cooling the refrigerated storage space are arranged on the back of the refrigerated room (55), and are located at positions corresponding to the back of the vegetable room (58) below. Is equipped with a refrigeration cooler (64) and a fan (66) for cooling refrigeration storage spaces such as ice making chambers (56), temperature switching chambers, and freezing chambers (59). 80) Refrigerant from the compressor (82) installed in the refrigeration and refrigeration coolers (63) (64) is alternately introduced into the refrigeration and refrigeration coolers (63) and (64) by a switching valve, and each is cooled to a predetermined temperature to generate cold air Was circulated to each storage space by each fan (65) (66).

  The refrigeration and refrigeration coolers (63) and (64) are connected in parallel during the refrigeration cycle, as shown in FIG. 12, which is a rear view of the inner box assembly before filling with the heat insulating material (54). A refrigeration suction pipe (70) is connected to the outlet side of the refrigeration cooler (63), and a refrigeration suction pipe (75) is connected to the refrigeration cooler (64) via an accumulator. Both of them passed through the heat insulating wall and pulled out into the lower machine room (80).

  In the machine room (80), as shown in FIG. 13, the refrigeration suction pipe (70) is connected to a connection pipe A (71), and the refrigeration suction pipe (75) is provided with a check valve (78). The pipe B (76) is connected, both are connected to the Y-shaped joint (83) and merged, and the connecting pipe C (85) is connected to return the compressor (82).

  In the above configuration, the discharge side pipe and the suction side pipe from the compressor (82) are connected in the machine room (80), but in addition to the compressor (82), an air cooling fan or Various parts such as an evaporating dish and a control board are arranged, and refrigeration cycle piping is installed in a complicated manner, which is not sufficient as a work space for connecting piping such as welding.

  On the other hand, the piping connection work with the suction pipe and capillary tube around each cooler in the warehouse is also performed in a narrow space such as the back of the storage room with various parts such as coolers and wiring parts installed. The work was extremely complicated.

  The present invention was made in consideration of the above points, and even in a narrow space such as a machine room in which many parts are arranged and the inner part of the warehouse, by improving the component configuration and arrangement of piping, It aims at providing the refrigerator which can improve attachment workability | operativity.

  In order to solve the above-mentioned problems, a refrigerator according to the present invention is a refrigerator provided with a refrigeration cooler and a refrigeration cooler that exclusively cools a refrigerated storage space and a refrigerated storage space that are insulated in a plurality of independent rooms. A squeezing device connected to the inlet pipe of the refrigeration cooler, and a connecting pipe A having an accumulator connected to the outlet pipe, a squeezing device connected to the refrigeration cooler, and a connection connected to the outlet pipe A heat insulating material between the inner and outer boxes in a state in which the suction pipe assembly formed by integrating the pipe B and the connecting pipe A and the connecting pipe B together with the suction pipe connected to the downstream side is disposed on the back of the inner box After that, the suction pipe assembly, the refrigeration cooler and the refrigeration cooler are connected inside the storage.

  According to the refrigerator of the present invention, even in a complicated and narrow space in which many parts are arranged, the parts arrangement and assembly configuration are simplified to improve the installation workability such as pipe joining, and the installation space is made compact. Thus, the effective storage volume efficiency in the cabinet can be increased.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a longitudinal sectional view of a refrigerator, and FIG. 2 is a front view thereof. The refrigerator is composed of an outer box (2), an inner box (3), and a heat insulating material (4) filled in a space between these inner and outer boxes. The refrigerator main body (1) formed of a heat-insulated box body is used as a storage space with a refrigerator compartment (5) at the top and an automatic ice maker with a relatively small volume via a heat-insulating partition wall (10) below it. An ice making room (6) and a temperature switching room (7) are provided side by side, and a vegetable room (8) is disposed below them, and a freezing room (9) is further disposed below them. A heat insulating partition wall (10) is also provided between the vegetable compartment (8) and the freezer compartment (9), and a dedicated door is provided at the front opening of each storage compartment so as to be freely opened and closed. .

  Since the refrigerator compartment (5) has the largest storage capacity and is frequently used, the opening is pivotally closed by pivotally supporting a double door with hinges provided on both sides of the front opening. The storage rooms such as the ice making room (6) and the temperature switching room (7), the vegetable room (8), and the freezing room (9) other than the refrigerating room (5) arranged in the lower part have a smaller storage capacity than the refrigerating room. From the ease of use depending on the installation height position, the container held on the support frame fixed to the door is slid back and forth with the rail member provided on the indoor wall surface, and is pulled out of the room together with the opening operation to open the upper surface of the container The drawer door system is used to store and take out food from.

  Thus, on the back of the vegetable compartment (8) positioned below from the center of the main body, the refrigerator compartment (5) and the refrigerated storage space (11) of the vegetable compartment (8) are cooled (hereinafter referred to as R). .) Refrigerator (13) and a refrigeration cooler (hereinafter referred to as F) for cooling the ice making chamber (6), the temperature switching chamber (7), the refrigeration storage space (12) such as the freezer compartment (9), etc. (14) are provided so as to overlap each other in the depth direction.

  As shown in FIG. 3, each of the storage chambers includes a compressor (22), a condenser (23), and a refrigerant flow switching device installed in a machine chamber (20) formed on the lower back surface of the main body. From (24), an R throttle device (25) formed of a capillary and an R cooler (13) on the high temperature side are connected in series to form a refrigeration side circuit that returns to the compressor (22), and In parallel with the refrigeration side circuit from the three-way valve (24), a refrigeration side circuit comprising an F throttle device (26), a low temperature side F cooler (14), an accumulator (27), and a check valve (28). The refrigeration side circuit and the refrigeration side circuit are joined together and cooled by a refrigeration cycle (21) configured to return to the compressor (22) by a single common suction pipe (30). .

  Then, according to the temperature detected by a temperature sensor (not shown) provided in the refrigerator compartment (5), the freezer compartment (9), etc., the three-way valve (24) comprises an R throttle device (25) and an R cooler (13). Cooling by supplying refrigerant by alternately switching the flow path to the side circuit or the refrigeration side circuit consisting of the F throttle device (26) and F cooler (14), accumulator (27), and check valve (28) While operating, the cold air generated in each cooler is heated to a high temperature by the rotation of the R fan (15) and the F fan (16) disposed in the vicinity of the R cooler (13) and the F cooler (14), respectively. Refrigerated storage space (11) in the refrigerator room (5) and vegetable room (8) on the side, and the freezer storage space (11), ice making room (6), temperature switching room (7) on the low temperature side ( 12), and each of them is independently set at a predetermined temperature, for example, -13 ° C for refrigeration. Use by controlling the evaporation temperature approximating as possible to the corresponding storage space temperature of about -30 ° C., in which by maintaining a high refrigeration cycle efficiency perform power saving operation.

  Specifically, the upper refrigerator compartment (5) and the lower freezer compartment (9) are partitioned by a heat insulating partition wall (10) (10), and the inside is insulated by the heat insulating partition wall and the ice making chamber (6) and the temperature. As can be understood from FIG. 4, which shows a front view of the storage room before being divided into the switching room (7) and the vegetable room (8), the R cooler (13) on the high temperature side has a front vegetable room. The (8) side and the low temperature side F cooler (14) are arranged on the rear side, and these R and F coolers (13) and (14) are formed of a molded heat insulating material such as polystyrene foam. The front R cooler (13) is arranged on the right side when viewed from the front, and the rear F cooler (14) is arranged on the left side with an insulating cover (17) interposed therebetween. .

  As shown in FIG. 5 which is a detailed perspective view of the main part of FIG. 4, a connecting pipe A (31) is connected to the refrigerant outlet pipe (13a) from the R cooler (13), and an F cooler ( A connecting pipe B (32) having an accumulator (27) and a check valve (28) is connected to the outlet pipe (14a) of 14) via the inlet pipe. The connecting pipe B (32) The non-return valve (28) and the downstream side of the connecting pipe A (31) are connected by a Y-shaped joint (33), so that one flow path from the outlets of the R and F coolers (13) and (14) is provided. The suction pipe (30) is connected to the outlet of the Y-shaped joint (33).

  The connecting pipe A (31), the connecting pipe B (32) having an accumulator (27) and a check valve (28), and the Y-shaped joint (33) and the suction pipe (30) are connected in advance by soldering. And the suction pipe assembly (29) together with the R and F throttle devices (25) (26) arranged in a heat exchange state in the suction pipe (30) leading to the machine room (20). It is partized. Note that the suction pipe (30) leading to the machine room (20) is long and bypasses to the upper part of the inner box (3) in order to sufficiently exchange heat with the R and F throttle devices (25) and (26). Arranged.

  This suction pipe assembly (29) is preliminarily placed on the back side of the inner box (3) in a pretreatment stage before foaming and filling the heat insulating material (4) between the outer box (2) and the inner box (3). The long suction pipe (30) is fixed to the back of the inner box (3) with a hook or tape, and the lower end is exposed to the machine room (20). Other assembly parts The F-cooler (14) side connection pipe B (32) Y-type joint (33), check valve (28) and accumulator (27) inlet pipe correspond to the back of the F-cooler (14). The inner box (3) is pulled out from the opening B (35) to the inner side.

  The connecting pipe A (31) is bent into a shape that matches the joint end of the outlet pipe (13a) of the R cooler (13), and the leading end is brought into the interior from the opening A (34) of the inner box. The side connected to the Y-joint (33) at the other end of the drawer is from the opening A (34) to the inner side from the opening B (35) together with the Y-joint (33) via the back of the inner box (3). The suction pipe (30) that has been integrated into the machine room (20) is connected to the suction pipe of the compressor (22) and attached to the suction pipe (30). The R and F throttle devices (25) and (26) are respectively connected to a three-way valve (24) provided at the end of the condenser (23) facing the machine room (20).

  In addition, after the piping introduction to the inside of the warehouse, the openings A (34) and B (35) are closed with a lid, and the foam heat insulating material (4) is filled between the inner and outer boxes. In particular, the R cooler (13 ) Side connection pipe A (31) is inserted in the vicinity of the opening A (34) in the vicinity of the connection pipe A (31) relatively long on the inner side by the cooling operation of the R cooler (13). ) And the outlet pipe (13a) of the R cooler, and the R cooler (13) is defrosted, the frost is melted and dew flows and falls into the cabinet.

  In the refrigerator of the present invention, as shown in FIG. 6 which is a cross-sectional view of the corresponding portion, the receiving surface is formed in an arc shape immediately below the pipe portion in the opening A (34) through which the connecting pipe A (31) in the lid portion is pulled out. Insulator corresponding to the connecting pipe A (31) and the outlet pipe (13a) of the R cooler located at the inner side of the dew receiving rib (47) which is formed on the inner side and is inclined to the inner side. The surface of (17a) has an inclined surface so as to receive the defrosted water that has fallen and lead it to the R drainage basin (48). 4 ') Eliminates the problem of dew water entering and freezing.

  Further, according to the above configuration, the drainage basin is provided on the F side together with the R drainage basin (48), and accordingly, a drainage hose is required for each, but the drainage hose machine room (20 If the outlet part to) is placed close and fixed with a single hose fixing part, the number of parts and assembly man-hours will be reduced, the cost will be reduced, the construction will be simplified, and the machine room space will be made more compact. Can do.

  And it is a cross-sectional view in the cooling fan (15) (16) portion corresponding to the back of the ice making chamber (6) and the temperature switching chamber (7) above the vegetable chamber (8), 4) and FIG. 8 which is a longitudinal sectional view in the vicinity of the F cooler (14), the front R cooler (13) is connected to the rear F cooler ( 14) and an R fan (15) and an F fan (16) corresponding to the upper part of each of the R and F coolers (13) and (14), and the F cooler ( The refrigeration-side cold air generated and raised in 14) and sucked in from the rear part of the F fan (16) is partly on the front ice making room (6) and temperature switching room (7) with the front part as the blowing side. Are introduced through dampers (18), and most of the other cool air is supplied to the F cooler (14) by the insulating cover (17). ) Is blown out from the duct formed on the front surface to the lower freezer compartment (9), and each room is controlled to be cooled to a set temperature.

  The cold air circulated through the ice making chamber (6) and the temperature switching chamber (7) passes through the respective return ducts formed in the heat insulating space on the left side of the R cooler (13) provided close to the right side, and the F cooler (14 ) Combined with the cold air led to the lower suction port and circulated through the freezer compartment (9), returns to the F cooler (14).

  Cooling of the refrigerating space is performed by blowing cool air upward from the R fan (15) through a duct extending rearward from the upper part of the R cooler (13) provided on the right side, and spreading over the entire back of the refrigerating room (5). Then, it flows into the rear duct (38) formed wider and blows out into the room from the R outlet (39) such as the upper surface, the center of the rear surface, and the side of the rear surface, and cools the inside of the refrigerator compartment (5) to a predetermined temperature. .

  The cold air circulated in the refrigerator compartment (5) flows into the suction duct from the bottom of the room, is introduced into the vegetable compartment (8) through the back of the temperature switching chamber (7), and circulates in the vegetable compartment (8). After cooling, the air is sucked into the lower part of the R cooler (13) from below, and the circulation is repeated thereafter.

  As described above, the R cooler (13) and the F cooler (14) overlap each other on the back of the vegetable compartment (8), and are shifted to the left and right to increase the difference in evaporation temperature. In addition to minimizing the temperature effect on both coolers, the cooling fans (15) and (16) corresponding to each cooler are placed above each cooler (13) and (14), and The F fan (15) is blown forward with the cold air blowing direction reversed.

  Therefore, the cool air generated by each of the coolers (13) and (14) can be flowed to the corresponding cooling fans (15) and (16) in a good positional relationship, and the F fan (15) and the F cooler (14). Since the F blowout duct (37) is formed on the front surface of the, and the R cooler (13) is disposed through the insulating cover (17), the thickness of the heat insulating material of the insulating cover (17) is reduced. can do.

  In addition, return ducts from the ice making chamber (6) and the temperature switching chamber (7) are provided in the heat insulating wall on the side of the R cooler (13) installed on the front side. It is possible to prevent a decrease in the volume of the storage chamber due to the installation.

  The R cooler (13) and the F cooler (14) are, as shown in FIG. 9 which is an exploded perspective view of each component, an F EVA cover (41) covering the front surface of the F cooler (14), Cover the front of the R cooler (13) with the R cover (42) through the insulation cover (17) to make the evaluation assembly (40). After filling the foam insulation (4) between the inner and outer boxes, this is made into ice. It is installed on the back of the space that constitutes the chamber (6), the temperature switching chamber (7), and the vegetable chamber (8).

  And the inlet pipe to the connection pipe A (31) and the accumulator (27) in the suction pipe assembly (29) introduced into the warehouse from the back side of the inner box through the openings A (34) and B (35) And the pipe ends of the R and F throttle devices (25) and (26) are respectively soldered.

  At this time, as described above, since the front R cooler (13) is installed at a lower position than the rear F cooler (14), the pipe joining work on the F cooler (14) is easily performed. In this state, each cooling fan (15) (16) is positioned above each cooler (13) (14) so that each cooling air inlet is shown in an exploded perspective view in FIG. The cooler unit part is built by incorporating an EVA cover assembly (43) and a fan duct assembly (45) with a cool air duct to the chamber and air outlet, and covering the front of the entire assembly with the front cover (44). Complete the assembly.

  Therefore, according to the said structure, when comprising the heat insulation storage space of a refrigerator, the heat insulation partition wall (5) and the lowermost storage room (in the case of a present Example, freezer compartment (9)) are comprised. 10) is formed by an in-situ foaming method to obtain rigidity as a cabinet, and an ice making room (6), a temperature switching room (7), and a vegetable room (8) partitioned by the heat insulating wall (10) are arranged. As shown in FIG. 4, the rear surface to be provided is made into one section, and in this portion, the R and F coolers (13) and (14), the fans (15) and (16), and a cooler chamber including a duct. Can be arranged as a unit as an EVA assembly (40) or an EVA cover assembly (43), and the cooling equipment parts originally composed of many parts groups can be simplified to facilitate the assembly work and to make a predetermined It can be accurately integrated into the site.

  At the same time, piping components of the refrigeration cycle connected to each cooler (13) (14), that is, the connecting pipe A (31) connected to the refrigerant outlet pipe (13a) of the R cooler (13), F cooling Connecting pipe B (32) having accumulator (27) and check valve (28) connected to outlet pipe (14a) of vessel (14), and check valve for connecting pipe A (31) and connecting pipe B (28) and a Y-type joint (33) that joins the Y-type joint (33), and a suction pipe (30) that is connected to a single outlet and a capillary R and F throttling device ( 25) and (26) are pre-assembled into one piece as a suction pipe assembly (29) by soldering, and this is concentrated in the vicinity of the accumulator (30) in the vicinity of the opening A (34). 34) By using B (35) and introducing it into the warehouse, F Each cooler (13) (14) and can be easily and reliably perform the connection work in a relatively large space for the plurality of storage compartments.

  In addition, by integrating each part as a unit, the arrangement is integrated, resulting in a compact and space-saving effect. In addition, the unitization facilitates transportation and improves manufacturability and service work efficiency. Can be

  The partition wall that separates the vegetable compartment (8) from the upper chamber, and the partition wall that separates the upper ice making chamber (6) from the temperature switching chamber (7) are provided in the above-described EVA assembly (40) and EVA cover assembly ( 43) is installed and assembled after the unit is installed on the back side. According to the above embodiment, the front side of the R cooler (13) arranged on the front side is the vegetable room (8). Since the temperature difference is relatively small, the surface of the front cover (44) can be covered only with the front cover (44) made of a sheet-shaped resin molding without providing a heat insulating material. The depth of the vegetable compartment (8) can be increased by reducing the thickness, and the volume of the indoor storage space can be increased.

  In addition, with the above configuration, the R cooler (13), which has been conventionally arranged on the back surface of the refrigerator compartment (5), is arranged together with the F cooler (14) to cool the back of the refrigerator compartment (5). Since the space for installing the cooler is not required and the back duct (38) can use the entire back surface of the refrigerator compartment (5), the depth of the cooler and the cooler It becomes possible to obtain the required predetermined air passage cross-sectional area by compressing the thickness dimension that required 50 mm in the heat insulation wall thickness with the room to 15 mm for installing the rear duct (38).

  Therefore, the volume of the refrigerator compartment (5) can be remarkably increased by increasing the compressed portion of the thickness dimension as the depth dimension of the refrigerator compartment (5), which is effective in a large refrigerator having an effective internal volume of about 400L. The storage volume can be increased by several tens of liters.

  In the above embodiment, the refrigeration cooler (13) and the refrigeration cooler (14) are connected in parallel during the refrigeration cycle, and the connection pipe A (31) and the connection pipe B (32) are connected to each other as Y. Although what was joined by the type | mold joint (33) was demonstrated, each cooler is not restricted to parallel, What was made to connect in series may be used. In addition, the layout of each storage room is a refrigerator room (5) at the top, then an ice making room (6) and a temperature switching room (7), a vegetable room (8) at the bottom, and a freezer room at the bottom. Although arranged as in (9), the present invention is not limited to this.

  INDUSTRIAL APPLICABILITY The present invention can be used for a refrigerator provided with a cooler that cools a frozen storage space and a refrigerated storage space and a cold air circulation fan.

It is a longitudinal cross-sectional view of the refrigerator which shows one Embodiment of this invention. It is a front view of the refrigerator of FIG. It is the schematic which shows the refrigerating cycle of the refrigerator in FIG. It is a front view which shows the storage chamber state before dividing the refrigerator compartment lower part of FIG. 2 into several chambers. It is a perspective view which shows the detail of the piping state in FIG. It is a longitudinal cross-sectional view which shows the connection pipe drawing-out state from R cooler in FIG. It is a cross-sectional view of the vicinity of the R and F coolers of FIG. It is a longitudinal cross-sectional view of the F cooler part in FIG. It is a disassembled perspective view of the cooler component of FIG. It is a disassembled perspective view which shows the cooling fan and duct component of FIG. It is a longitudinal cross-sectional view which shows the conventional refrigerator structure. FIG. 13 is a rear view of the inner box before filling with a heat insulating material in FIG. FIG. 13 is a rear perspective view showing the machine room of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Refrigerator body 3 Inner box 4 Insulation material 5 Refrigeration room 6 Ice making room 7 Temperature switching room 8 Vegetable room 9 Freezing room 10 Thermal insulation partition wall
13 R cooler 14 F cooler 15 R fan
16 F fan 17 Insulation cover 20 Machine room
21 Refrigeration cycle 22 Compressor 24 Three-way valve
25 R diaphragm 26 F diaphragm 27 Accumulator
28 Check valve 29 Suction pipe assembly 30 Suction pipe
31 Connecting pipe A 32 Connecting pipe B 33 Y-shaped joint
34 Opening A 35 Opening B 37 F F outlet duct
38 Rear duct 39 R outlet 40 EVA assembly
43 Ever cover assembly 45 Fan duct assembly 47 Dew receiving rib
48 R drain outlet

Claims (5)

  A throttle connected to an inlet pipe of a refrigeration cooler in a refrigerator provided with a refrigeration cooler and a refrigeration cooler dedicated to cooling a refrigerated storage space and a refrigerated storage space that are insulated in a plurality of independent rooms. And a connecting pipe A having an accumulator connected to the outlet pipe, a throttling device connected to the refrigeration cooler, a connecting pipe B connected to the outlet pipe, the connecting pipe A and the connecting pipe B The heat sink is foam-filled between the inner and outer boxes with the suction pipe assembly formed by integrating the suction pipe connected to the downstream side of the inner box at the back of the inner box, and then the suction pipe assembly and refrigeration The refrigerator characterized by connecting the cooler and the refrigerator for refrigeration in the warehouse inner side.   The refrigeration cooler and the refrigeration cooler are connected in parallel during the refrigeration cycle, and the connecting pipe A is provided with a check valve on the downstream side of the accumulator, and the connecting pipe A and the connecting pipe B are connected to the Y-type joint. The refrigerator according to claim 1, wherein a suction pipe assembly is formed by connecting the suction pipe to the Y-shaped joint.   The refrigeration cooler and the refrigeration cooler are arranged close to each other so that at least a part thereof overlaps in the front-rear direction, and the connection pipe A and the expansion device, and the connection pipe B and the expansion device are separated from each other. The refrigerator according to claim 1 or 2, wherein the refrigerator is led out from the opening of the inner box provided and connected to each cooler.   4. The refrigerator according to claim 3, wherein the refrigerator for freezing and the refrigerator for refrigeration are disposed in a back space of a storage chamber that is positioned below the refrigerator compartment and forms a plurality of storage compartments. 4. The refrigerator according to claim 3, wherein the accumulator, the check valve, and the throttle device forming the connecting pipe A on the refrigeration cooler side are arranged in a concentrated manner so as to be arranged inside the drawer through the inner box opening.

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