JP2013024441A - Damper device and refrigerator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a refrigerator which securely closes the opening of a damper device and provides improved energy saving performance.SOLUTION: A damper device includes a frame having an opening, a plate-like opening/closing body for opening/closing the opening, a drive means for driving the opening/closing body about a rotation shaft, and an opening/closing body closing means which is provided in a position on the opposite side of the opening/closing body to the rotation shaft and biases the opening/closing body in a closing direction. The opening/closing body closing means includes an engaging part which is projected to the opposite side of the opening/closing body from the rotation shaft and a drive force transmission part which biases the opening/closing body in the closing direction with the rotation shaft as a fulcrum by allowing the drive force of the drive means to work on the engaging part.

Description

  The present invention relates to a damper device and a refrigerator.

  Conventionally, in each refrigerator having a refrigerated temperature zone and a refrigeration temperature zone, the cold air heat-exchanged by the cooler is blown to each of the storage chambers by a blowing means. In order to control the flow rate of cool air to the air, there is known a configuration that includes an open / close damper device and controls the opening / closing of the damper device.

  As conventional techniques related to the damper device, techniques described in Patent Document 1 and Patent Document 2 shown below are known.

  In Patent Document 1, a stopper that mechanically restricts a baffle (opening / closing body) that opens and closes to an opening to a desired opening position is provided, so that the opening position of the baffle due to a malfunction of the motor can be reduced. A configuration that prevents errors is disclosed.

  Further, Patent Document 2 discloses a configuration in which a contact portion formed so as to protrude toward the baffle is provided in the opening, and the contact portion hardly causes a gap between the baffle and the opening. .

Special table 2008-528923 Japanese Patent No. 3047160

  The temperature range of the refrigerator compartment is approximately 3 to 5 ° C, and that of the freezer compartment is approximately -18 ° C. Therefore, when distributing cold air from a cooler to a refrigerator compartment or a freezer compartment via a cold air duct, it is necessary to switch a cold air flow rate. In view of this, an open / close-type refrigerator compartment cooling damper device and a freezer compartment cooling damper device (hereinafter collectively referred to as “damper device”) are provided to control the flow rate of the cool air by opening and closing them.

  Since the damper device is provided in the cold air duct, it is conceivable to enlarge the opening area when the damper device is opened in order to reduce the blowing resistance. In particular, in recent refrigerators, an increase in the internal volume is required, and it is desirable that the volume in the storage space is not reduced while the opening area is enlarged.

  On the other hand, if the occupying volume of the cold air duct is reduced too much and the blowing resistance of the cold air is increased, the power consumption of the blower (blower fan) for blowing the necessary cold air is increased, and the energy saving performance may be lowered.

  Therefore, in order to improve the energy saving performance without reducing the volume in the storage space, it is preferable that the cold air duct has a flat shape and the size in the depth direction of the refrigerator is reduced. As a shape of the damper device for that purpose, it is desirable to use a horizontally long and narrow rectangular shape with a small depth dimension and an increased width.

  As an example, when only the freezer compartment is cooled, control is performed such that the refrigerating compartment cooling damper device is closed and the freezer compartment cooling damper device is opened. At this time, if there is a gap in the cold room cooling damper device, cold air flows into the cold room through the gap, and relative warm air flows from the cold room. As a result, cold air for cooling only the freezer compartment is originally required, but an additional amount of cooling heat for the gas exchanged with the refrigerator compartment is required. Therefore, from the viewpoint of energy saving, it is desirable to increase the sealing degree when closing the damper device.

  As described above, it is desirable to improve the sealing property at the time of closing while increasing the opening area of the damper device. However, when the opening area of the damper device is increased, each part becomes larger, so that the rigidity of the part is reduced and elastic deformation is likely to occur, and in the case of a resin part, deformation such as warping and twisting during molding is also caused. As a result, there is a problem that a gap is easily generated at the time of closing and is difficult to seal. In particular, when the damper opening / closing body has a long and narrow rectangular shape, deformation and elastic deformation during molding are likely to occur.

  In the above conventional technology, the sealing property obtained by closing the baffle while being pressed against the opening is maintained by locking the movement of the motor and the gear. However, due to the influence of the gear backlash, the baffle is maintained. As a result of receiving a repulsive force from the pressing portion, there is a problem that a gap is partially generated between the contact portion provided in the opening portion.

  Then, an object of this invention is to obtain the refrigerator which can close the opening of a damper apparatus reliably and improved energy-saving performance.

  In order to solve the above problems, for example, the configuration described in the claims is adopted. The present application includes a plurality of means for solving the above problems. For example, a frame having an opening, a plate-shaped opening / closing body for opening / closing the opening, and driving the opening / closing body around a rotation axis. Drive means, and opening / closing body closing means provided at a position opposite to the opening / closing body with respect to the rotating shaft and biasing the opening / closing body in a closing direction.

  The present invention can reliably close the opening of the damper device and can provide a refrigerator with improved energy saving performance.

It is a front external view of the refrigerator which concerns on embodiment of this invention. It is XX sectional drawing of FIG. 1 showing the structure in the store | warehouse | chamber of a refrigerator. It is a front view showing the structure in the store | warehouse | chamber of a refrigerator. FIG. 3 is an enlarged explanatory view of main parts of FIG. 2. It is a perspective view which shows the whole structure of a damper. It is a perspective view which shows the whole structure of a damper. FIG. 6 is a YY sectional view of FIG. 5 showing the configuration of the damper. It is the schematic which looked at the drive means of the damper in the arrow Z direction of FIG. It is the schematic which looked at the drive means of the damper in the arrow Z direction of FIG. It is the schematic which looked at the drive means of the damper in the arrow Z direction of FIG. It is the schematic which looked at the drive means of the damper in the arrow Z direction of FIG. It is a perspective view which shows the deformation | transformation shape by the load torque of the opening / closing body of a damper. FIG. 13 is a cross-sectional view taken along the line U-U in FIG. 12 showing a state in which the opening / closing body of the damper is deformed by load torque. FIG. 13 is a schematic view showing a distribution state of a pressing force generated between the opening / closing body and the contact portion, as viewed in the direction of the arrow W in FIG. 12. It is a perspective view which shows the structure of the stopper which suppresses a deformation | transformation of the opening-closing body of the damper by this invention. It is VV sectional drawing of FIG. 15, and shows the closed state of an opening-closing body. It is VV sectional drawing of FIG. 15, and the opening-closing body shows the intermediate state of a closed state and an open state. It is VV sectional drawing of FIG. 15, and shows the open state of an opening-closing body. FIG. 16 is a schematic diagram showing a distribution state of a pressing force generated between the opening / closing body and the contact portion, as viewed in the direction of the arrow W in FIG. 15. VV sectional drawing which shows another structure of the stopper which suppresses a deformation | transformation of the opening-closing body of the damper which concerns on another embodiment by this invention. The VV sectional view in which the opening-and-closing body of Drawing 20 shows the middle state of a closed state and an open state. Sectional drawing which shows the mode of pressing to the opening part of the opening-closing body of the damper by this invention. FIG. 23 is a cross-sectional view showing an example of a configuration obtained by extending the configuration of FIG. FIG. 24 is a cross-sectional view showing a configuration example of a type different from those in FIGS. 22 and 23 in the present invention. FIG. 25 is a cross-sectional view showing a closed state of a configuration to which the configuration example of FIG. 24 is applied. FIG. 25 is a cross-sectional view showing an open state of a configuration to which the configuration example of FIG. 24 is applied.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a front outline view of the refrigerator of the present embodiment. FIG. 2 is an XX longitudinal cross-sectional view in FIG. 1 illustrating a configuration inside the refrigerator. FIG. 3 is a front view showing the configuration of the refrigerator interior, and FIG. 4 is an enlarged explanatory view of the main part of FIG. 2, showing the arrangement of cold air ducts and air outlets. As shown in FIG. 1, the refrigerator 1 of this embodiment has the refrigerator compartment 2, the ice making room 3, the upper freezer compartment 4, the lower freezer compartment 5, and the vegetable compartment 6 from upper direction. As an example, the refrigerator compartment 2 and the vegetable compartment 6 are storage rooms in a refrigerator temperature zone of approximately 3 to 5 ° C. Further, the ice making room 3, the upper freezing room 4 and the lower freezing room 5 are storage rooms in a freezing temperature zone of approximately −18 ° C.

  The refrigerating room 2 includes, on the front side, refrigerating room doors 2a and 2b with double doors (so-called French type) divided into left and right. The ice making room 3, the upper freezing room 4, the lower freezing room 5, and the vegetable room 6 include a drawer type ice making room door 3a, an upper freezing room door 4a, a lower freezing room door 5a, and a vegetable room door 6a. Hereinafter, the refrigerator compartment doors 2a and 2b, the ice making compartment door 3a, the upper freezer compartment door 4a, the lower freezer compartment door 5a, and the vegetable compartment door 6a are simply referred to as doors 2a, 2b, 3a, 4a, 5a, and 6a.

  The refrigerator 1 includes a door sensor (not shown) that detects the open / closed state of the doors 2a, 2b, 3a, 4a, 5a, and 6a, and a state in which each door is determined to be open for a predetermined time, for example, An alarm (not shown) for notifying the user when the operation is continued for one minute or more and a temperature setting device (not shown) for setting the temperature of the refrigerator compartment 2 and the temperature of the upper freezer compartment 4 and the lower freezer compartment 5 Etc.

  As shown in FIG. 2, the outside of the refrigerator 1 and the inside of the refrigerator 1 are separated by a heat insulating box 10 formed by filling a foam heat insulating material (foamed polyurethane) between the inner box 10a and the outer box 10b. ing. Moreover, the heat insulation box 10 of the refrigerator 1 has a plurality of vacuum heat insulating materials 25 mounted thereon.

  The inside of the refrigerator is separated from the refrigerator compartment 2 by the heat insulating partition wall 28, the upper freezing chamber 4 and the ice making chamber 3 (see FIG. 1, the ice making chamber 3 is not shown in FIG. 2). The lower freezer compartment 5 and the vegetable compartment 6 are separated.

  A plurality of door pockets 32 are provided inside the doors 2a and 2b (see FIGS. 1 and 2). The refrigerator compartment 2 is partitioned into a plurality of storage spaces in the vertical direction by a plurality of shelves 36.

  As shown in FIG. 2, the upper freezer compartment 4, the lower freezer compartment 5, and the vegetable compartment 6 are integrated with doors 3a, 4a, 5a, 6a provided in front of the respective compartments, and storage containers 3b, 4b, 5b. , 6b are provided. The storage containers 4b, 5b, and 6b can be pulled out by placing a hand on a handle portion (not shown) of the doors 4a, 5a, and 6a and pulling it out toward the front side. Similarly, the ice making chamber 3 shown in FIG. 1 is provided with an unillustrated storage container (indicated by (3b) in FIG. 2) integrally with the door 3a. The container 3b can be pulled out by pulling it out.

  As shown in FIG. 2 (see FIG. 3 as appropriate), the cooler 7 is provided in a cooler storage chamber 8 provided substantially at the back of the lower freezing chamber 5. An internal fan 9 (blower) is provided above the cooler 7. Air cooled by heat exchange in the cooler 7 (hereinafter, low-temperature air heat-exchanged by the cooler 7 is referred to as “cold air”) is blown into the refrigerator compartment air duct 11 by the internal fan 9, and the vegetable room air blown by reference numerals. Refrigeration room 2, vegetable room 6, upper freezer room 4, lower freezer room 5, ice making through duct (see FIG. 3), upper freezer room air duct 12, lower freezer room air duct 13, and ice making room air duct (not shown) It is sent to each room of room 3. Air blowing to each room is controlled by opening and closing the refrigerator compartment damper 20 and the freezer compartment damper 50.

  Incidentally, the air ducts to the refrigerator compartment 2, the ice making room 3, the upper freezer room 4, the lower freezer room 5, and the vegetable room 6 are provided on the back side of each room of the refrigerator 1 as indicated by broken lines in FIG. Yes.

  Specifically, when the refrigerator compartment damper 20 is in the open state and the freezer compartment damper 50 is in the closed state, the cold air is sent to the refrigerator compartment 2 from the outlets 2c provided in multiple stages via the refrigerator compartment air duct 11. And it sends to the vegetable compartment 6 from the blower outlet 6c through the vegetable compartment ventilation duct (refer FIG. 3) branched from the refrigerator compartment ventilation duct 11. FIG.

  Note that the cold air that has cooled the refrigerator compartment 2 is, for example, in the lower right portion as viewed from the front of the cooler storage chamber 8 through the refrigerator outlet return duct 16 from the return port 2d provided on the lower surface of the refrigerator compartment 2. Return. The return air from the vegetable compartment 6 returns to the lower part of the cooler storage compartment 8 through the return opening 6d.

  When the freezer damper 50 is in the open state, the cold air heat-exchanged by the cooler 7 passes through the ice making chamber air duct and the upper freezer room air duct 12 (not shown) by the internal blower 9, and the ice making chambers from the outlets 3c and 4c, respectively. 3. The air is blown into the upper freezer compartment 4. Further, the air is blown from the outlet 5 c to the lower freezer compartment 5 through the lower freezer compartment air duct 13. In this respect, the freezer compartment damper 50 is attached above a blower cover 56 described later, and facilitates the previous ice making chamber blow.

  In addition, the cold air that has cooled the upper freezer room 4, the lower freezer room 5, and the ice making room 3 returns to the cooler storage room 8 through the freezer return port 17 provided in the lower part of the lower freezer room 5.

  Thus, in FIG. 4, the partition 54 forms the outlets 3c, 4c, 5c. The partition 54 divides the upper freezing chamber 4, the ice making chamber 3, the lower freezing chamber 5, and the cooler storage chamber 8.

  55 is a fan motor fixing | fixed part to which the internal fan 9 is attached. The fan motor fixing portion 55 partitions the cooler storage chamber 8 and the partition 54.

  The internal fan 9 is attached to the fan motor fixing portion 55. A blower cover 56 covers the front surface of the internal fan 9. A cool air duct 13 is formed between the blower cover 56 and the partition 54. Further, the upper portion of the blower cover 56 forms a blowout port 56 a of the freezer compartment damper 50.

  The blower cover 56 includes a rectifying unit 56 b that covers the front surface of the blower 9. This rectifies the turbulent flow caused by the cold air blown out and prevents the generation of noise and the like.

  The blower cover 56 forms an upper freezer compartment air duct 12 and a lower freezer compartment air duct 13 so as to guide the cold air blown from the internal fan 9 to the outlets 3c, 4c, 5c, etc. between the blower cover 56 and the partition 54. doing.

  Further, the blower cover 56 also plays a role of blowing the cool air blown out by the internal blower 9 to the refrigerator compartment damper 20 side. That is, the cold air that does not enter the freezer damper 50 provided in the blower cover 56 part goes to the refrigerating room damper 20 side through the refrigerating room duct 15 as shown in FIG.

  And the cold air which passed through the cooler 7 is sent to both the freezing temperature zone room (the upper freezing room 4, the lower freezing room 5, and the ice making room 3) and the refrigeration temperature zone room (the refrigeration room 2 and the vegetable room 6). In some cases, the cool air is overwhelmingly sent to the freezer damper 50 side, but a slight amount of cool air goes to the refrigerating chamber duct 15 side.

  The refrigerator compartment damper 20 is attached to the rear part of the refrigerator compartment 2 as shown in FIG.

  A defrost heater 22 is installed below the cooler 7, and an upper cover 53 is provided above the defrost heater 22 to prevent defrost water from dripping onto the defrost heater 22. It has been.

  The defrost water generated by the defrosting (melting) of the frost attached to the wall of the cooler 7 and the surrounding cooler storage chamber 8 flows into the trough 23 provided at the lower part of the cooler storage chamber 8. It reaches the evaporating dish 21 disposed in the machine room 19 described later via the drain pipe 27 and is evaporated by the heat of a condenser (not shown) described later.

  Further, a cooler temperature sensor 35 attached to the cooler is shown in the upper right portion when viewed from the front of the cooler 7, a refrigerating room temperature sensor 33 is provided in the refrigerating room 2, and a freezer temperature sensor 34 is provided in the lower freezing room 5. The temperature of the cooler 7 (hereinafter referred to as “cooler temperature”), the temperature of the refrigerator compartment 2 (hereinafter referred to as “refrigerator compartment temperature”), the temperature of the lower freezer compartment 5 (hereinafter referred to as “freezer compartment temperature”). Can be detected).

  Furthermore, the refrigerator 1 includes an outside air temperature sensor and an outside air humidity sensor (not shown) that detect a temperature and humidity environment (outside air temperature, outside air humidity) outside the refrigerator. Note that the vegetable room temperature sensor 33a may also be arranged in the vegetable room 6.

  A machine room 19 is provided on the lower back side of the heat insulating box 10. The machine room 19 contains a compressor 24 and a condenser (not shown). Is removed. Incidentally, in this embodiment, isobutane is used as a refrigerant, and the amount of refrigerant enclosed is as small as about 80 g.

  A control board 31 on which a CPU, a memory such as a ROM and a RAM, an interface circuit, and the like are mounted is disposed on the top surface side of the refrigerator 1. The control board 31 opens and closes the doors of the outside temperature sensor, the outside humidity sensor, the cooler temperature sensor 35, the refrigerator temperature sensor 33, the freezer temperature sensor 34, and the doors 2a, 2b, 3a, 4a, 5a, and 6a. The door sensor for detecting the state, the temperature setter (not shown) provided on the inner wall of the refrigerator compartment 2, the temperature setter (not shown) provided on the inner wall of the lower freezer compartment 5, and the like are connected. And by the program previously installed in the ROM, the compressor 24 is turned on / off, the number of revolutions is controlled, the refrigerator motor 20 and the freezer damper 50 are individually driven. Control such as ON / OFF of the blower 9 and control of the rotational speed, control of ON / OFF of the external fan and control of the rotational speed, and control of ON / OFF of the alarm for notifying the door open state are performed.

  Next, when the refrigerating room damper 20 is closed and the freezing room damper 50 is open, only the freezing temperature zone (the ice making room 3, the upper freezing room 4 and the lower freezing room 5) is cooled. The cold air blown to the ice making chamber 3 through the ice making chamber air duct and the cold air blown to the upper freezer chamber 4 via the upper freezer chamber air duct 12 (see FIG. 2) descend to the lower freezer chamber 5. And it flows like the freezing room return air shown by the arrow C in FIG. 4 with the cold air sent to the lower freezing room 5 through the lower freezing room ventilation duct 13 (refer FIG. 2). That is, it flows into the cooler storage chamber 8 from the lower front of the cooler storage chamber 8 via the freezer return port 17 arranged at the lower back of the lower freezer chamber 5, and a large number of fins are attached to the cooler piping 7a. Heat exchange is performed with the cooler 7 configured as described above.

  Incidentally, the width of the freezer compartment return port 17 is substantially equal to the width of the cooler 7.

  On the other hand, when the refrigerator compartment damper 20 is in the open state and the freezer compartment damper 50 is in the closed state, and only the refrigerator compartment temperature zone (refrigerator compartment 2 and vegetable compartment 6) is being cooled, the return from the refrigerator compartment 2 is performed. The cold air flows into the cooler storage chamber 8 from the lower side of the cooler storage chamber 8 via the cooler chamber return duct 16 like the cooler return air indicated by the arrow D in FIG. Exchange heat with.

  The cold air that has cooled the vegetable compartment 6 flows into the lower part of the cooler storage chamber 8 via the vegetable compartment return port 6d (see FIG. 4), as shown in FIG. Less than the amount of air circulating and the amount of air circulating through the refrigerator compartment 2.

  As described above, the cold air in the refrigerator 1 is switched by appropriately opening and closing each of the refrigerator compartment damper 20 and the freezer compartment damper 50. Next, an example of the configuration and operation of the damper will be described using the freezer compartment damper 50 as an example with reference to FIGS.

  FIG. 5 is a perspective view showing an example of the configuration of the freezer compartment damper 50. FIG. 6 is a view of FIG. 5 as seen from the direction of the arrow S. 7 is a cross-sectional view in the YY direction in FIG.

  The freezer compartment damper 50 is provided with an opening 62 on one side, for example, a horizontally long frame 63 made of resin, for example, and a drive system such as a motor and a reduction gear at one end (rectangular short portion) of the frame 63. A built-in driving means 60 is provided, and a driving force is output from the driving shaft 61. The opening / closing body 64 is provided facing the opening 62 of the frame 63, one end of the opening / closing body 64 is pivotally supported by the drive shaft 61, and the other end of the opening / closing body 64 is provided at the other end of the frame 63. The support shaft 65 is rotatably provided. The opening / closing body 64 includes a resin-like plate-like opening / closing plate 64a and a buffer member 64b formed on one surface of the opening / closing plate 64a, for example, from a flexible material such as urethane foam or polyethylene foam. The opening / closing body 64 is swingable about a rotation shaft connecting the drive shaft 61 and the support shaft 65, and the rotation shaft is substantially parallel along one side in the longitudinal direction of the opening / closing body 64, It is arranged near the one side.

  The opening 62 of the frame 63 has a horizontally long substantially rectangular shape. A connecting means 62 a for connecting one side and the other side of the opening 62 and suppressing deformation of the opening 62 is provided at a substantially central portion in the longitudinal direction of the opening 62. The connecting means 62a serves as a support column for reinforcement. The connecting means 62a may be integrated with the frame 63 or may be a separate body as long as it suppresses the deformation of the opening 62.

  5 to 7 show a state where the opening / closing body 64 is closed. In the closed position, the opening / closing body 64 comes into contact with a contact portion 66 erected on the opening / closing body 64 side along the inner periphery of the opening 62 of the frame 63. This suppresses the flow of cool air through the opening 62. When the motor is rotated, the opening / closing body 64 is rotated by about 90 ° in the direction of the arrow (see FIGS. 5 and 7) via the drive shaft 61, so that the opening / closing body is in the open position indicated by 64 '. By opening and closing the opening / closing body 64 between the positions, the cool air can pass through the opening 62 in the open position, and the cool air flow is blocked and closed in the closed position.

  Next, an example of the configuration and operation of the driving unit 60 will be described with reference to FIGS. 8 to 11 are schematic views of the driving means 60 viewed in the direction of arrow Z in FIG. The driving means 60 includes a motor 70, and an output shaft 71 of the motor 70 is provided with a pinion gear 72 that rotates with the driving of the motor 70 and outputs torque. The idler gear 73 is a reduction gear that is rotatably supported around an idler fulcrum 74. A gear 73a meshing with the pinion gear 72 is provided on the outer periphery of the idler gear 73, and the torque from the pinion gear 72 is transmitted while being reduced. A part of the idler gear 73 is provided with a partial gear 73b. For example, the idler gear 73 is provided only in a range where the idler gear 73 rotates 90 °. A cylindrical portion 73c having a cylindrical shape is provided in a portion of the partial gear 73b other than the gear shape.

  The output gear 75 is pivotally supported around the drive shaft 61, and the drive shaft 61 is fitted to the opening / closing body 64. The opening / closing body 64 (opening / closing plate 64a, buffer member 64b) and the output gear 75 are connected to each other. It is connected and rotates as a unit. That is, the opening / closing body 64 is rotated around a longitudinal driving shaft of the opening / closing body 64 (a driving shaft in which one end of the opening / closing body 64 is pivotally supported by the driving shaft 61 and the other end is pivotally supported by the supporting shaft 65 of the frame 63). To drive.

  A partial gear 75 b is provided in a part of the output gear 75, meshes with a partial gear 73 b provided in a part of the idler gear 73, and rotates by, for example, 90 ° in conjunction with the idler gear 73. On both sides of the partial gear 75b of the output gear 75, an arc-shaped first stopper 75c and a second stopper 75d are provided. The first stopper 75c and the second stopper 75d are in a positional relationship in which the opening / closing body 64 contacts the cylindrical portion 73c of the idler gear 73 at the open position and the closed position. When the output gear 75 is rotated by approximately 90 °, which is a range where the partial gear 75b is engaged, the opening / closing body 64 connected to the output gear 75 is rotated, and then the first stopper 75c and the second stopper 75d. Comes into contact with the idler gear 73 and its rotation is restricted.

  Next, the operation of the driving unit 60 will be described. In FIG. 8, the driving means 60 shows a state similar to that shown in FIGS. 5 to 7, with the opening / closing body 64 in the closed state. A cylindrical portion 73c provided on the idler gear 73 is fitted with the second stopper 75d of the output gear 75, and holds the opening / closing body 64 in a closed state. 9 shows a state in which the motor 70 is driven from the state of FIG. 8 and the pinion gear 72, the idler gear 73, and the output gear 75 are rotated in the directions of the arrows, respectively. The partial gear 75b and the idler gear that are part of the output gear 75 are shown. 73 is engaged with a partial gear 73b provided in a part of 73. The second stopper 75 d of the output gear 75 is positioned away from the cylindrical portion 73 c of the idler gear 73. FIG. 10 shows a position rotated further in the direction of the arrow as compared with FIG. In FIG. 11, the rotation of the partial gear 75b, which is a part of the output gear 75, and the partial gear 73b provided in a part of the idler gear 73 are finished, and the first gear of the output gear 75 is turned. One stopper 75c is in a position where it is engaged with the cylindrical portion 73c of the idler gear 73, and holds the opening / closing body 64 in an open state. When the opening / closing body 64 is closed again, the state shown in FIG. 11 is reached from the state shown in FIG. 11 through the states shown in FIGS.

  By operating as described above, the freezer damper 50 opens and closes the opening / closing body 64.

  As described above, in order to reduce the ventilation resistance of cold air, it is necessary to increase the opening area of the damper. On the other hand, when the size is increased, the rigidity of the damper opening / closing body 64 is reduced, so that the elastic deformation due to the reaction force when the opening 62 is closed, or the amount of deformation due to warpage or deflection generated during molding increases, and the opening 62 is sealed. There is a problem that becomes difficult. This problem will be described below in further detail with reference to FIGS.

  FIG. 12 is a perspective view showing the overall configuration of the damper as in FIG. 6. When the opening / closing body 64 is closed by applying a driving torque T to the drive shaft 61, the state in which the opening / closing body 64 is elastically deformed is displaced. It is the figure expanded and described intelligibly. A state in which the opening / closing body 64 is not displaced is indicated by a broken line. 13 is a cross-sectional view taken along the line U-U in FIG. 14 is a view taken in the direction of the arrow W in FIG. 12 and shows the pressure contact force 67 generated between the flexible cushioning member 64b provided on the opening / closing body 64 and the contact portion 66 that is the outer periphery of the opening 62 of the frame 63. 6 is a schematic diagram showing the distribution state as a distribution of arrows perpendicular to the contact portion 66. FIG. A portion with a large arrow indicates that the pressure contact force 67 between the buffer member 64b and the contact portion 66 is large, and a portion with a small arrow indicates that the pressure contact force 67 is small. When the drive torque T is applied to the drive shaft 61, the buffer member 64b of the opening / closing body 64 is pressed and recessed against the contact portion 66 of the frame 63, and is held in a state where the drive torque T and the pressure contact force are balanced.

  As described above, the shaft on which the opening / closing body 64 swings is a rotation shaft that connects the drive shaft 61 and the support shaft 65, and the shaft is substantially parallel to one side in the longitudinal direction of the opening / closing body 64. Since it is arranged in the vicinity of one side, the driving torque T applied from the driving means 60 to the opening / closing body 64 via the driving shaft 61 is applied only to the corner of one end of the opening / closing body 64 having a substantially rectangular shape. Become. The opening / closing body 64 has a configuration in which a buffer member 64b is attached to an opening / closing plate 64a, and the buffer member 64b is made of a flexible member such as foamed polyurethane. Then, the driving torque T itself cannot be transmitted, and the strength and rigidity of the opening / closing body 64 are maintained by the opening / closing plate 64a. However, since the opening / closing plate 64a is generally a flat plate-like resin plate, the opening / closing plate 64a is easily elastically deformed with respect to a torsional torque along the longitudinal direction and a bending moment bent in the plate thickness direction.

  Since the driving torque T is applied to the opening / closing body 64 to contact the contact portion 66, the opening / closing body 64 receives a reaction force from the outer periphery of the contact portion 66, and the buffer member 64 b is compressed and recessed by the reaction force. The plate 64a is elastically deformed.

  Accordingly, the shape of elastic deformation at each of the four corners of the opening / closing body 64 and the center of the side in the longitudinal direction when the driving torque T is applied will be described in detail below.

  First, of the contact portion 66 around the opening 62, a portion A which is a corner near the drive shaft 61 on the drive means 60 side, and a support shaft on the opposite side (position away from the drive shaft 61 in the longitudinal direction). When the driving torque T is applied and the opening / closing plate 64a is to be elastically deformed at the corner C in the vicinity of 65, the drive shaft 61 and the support shaft 65 restrict the positions other than the rotational direction. That is, since the movement is restricted, even if the driving torque T is increased, the pressure contact forces 67A and 67C between the buffer member 64b and the opening 62 do not increase. Does not change.

  Next, in the portion D which is farthest from the drive shaft 61 on the drive means 60 side (on the side facing the rotation shaft of the opening / closing body 64), when the driving torque T is applied, the opening / closing body 64 is pressed in the direction of the arrow 80a. It is done. For this reason, the pressure contact force 67D in the portion D increases as the drive torque T increases. In the case where the distance between the A part and the D part is configured to be within a relatively small range, the deformation of the opening / closing body 64 between the A part and the D part becomes slight, and the driving torque T As the pressure increases, the pressure contact force 67D tends to increase.

  Next, in the F section which is on the opposite side of the drive means 60 (position away from the drive shaft 61 in the longitudinal direction) and farthest from the support shaft 65 (on the side facing the rotation axis of the opening / closing body 64), The part is farthest from the drive shaft 61, and the opening / closing body 64 is torsionally deformed by the drive torque T. Therefore, the pressure contact force 67F is small.

  That is, after the buffer member 64b of the opening / closing body 64 and the contact portion 66 contact with a slight pressure contact force 67F, even if the driving torque T is increased, the torque acts to torsionally deform the opening / closing body 64 itself. However, the effect of increasing the F contact pressure 67F is small.

  Next, the pressure contact force 67E at the E portion that is farthest from the drive shaft 61 from the center in the longitudinal direction of the opening / closing body 64 (on the side facing the rotation axis of the opening / closing body 64) is the pressure contact force between the D portion and the F portion. It takes a value between 67D and 67F. As described above, the pressing force 67D of the D portion increases as the driving torque T increases. On the other hand, the increase in the pressure contact force 67F of the F portion is small, and the pressure contact force decreases from the D portion to the F portion.

  Specifically, the deformation amount δde of the opening / closing body 64 generated between the D portion and the E portion on the driving means 60 side with respect to the central portion of the opening / closing body 64, and the E on the support shaft 65 side with respect to the central portion of the opening / closing body 64. Comparing the deformation amount δef of the opening / closing body 64 generated between the portion and the F portion, the deformation amount δde on the driving means 60 side is larger than the deformation amount δef on the support shaft 65 side. As a result, the pressure contact force 67E in the E portion is smaller than the average value of the pressure contact forces 67D and 67F in the D portion and the F portion, and as shown in FIG. 14, the pressure contact forces 67D, 67E, and 67F on the upper side in the drawing are connected. The distribution of the pressing force 67 is not a straight line, but tends to be a curve with a concave center.

  Next, the pressure contact force 67B of the B part which is the vicinity of the drive shaft 61 in the longitudinal center part of the opening / closing body 64 will be described. In FIG. 13, the drive torque T acts in the clockwise direction as shown. Then, the pressure contact force 67E at the E portion, which is the upper end of the opening / closing body 64, acts in the direction of the arrow 80E to press the buffer member 64b against the contact portion 66. On the other hand, in the portion B close to the drive shaft 61, the pressure contact force 67B when the drive torque T acts acts in the direction of 80B, which is the direction separating the buffer member 64b from the contact portion 66. That is, after the buffer member 64b comes into contact with the contact portion 66 at the E portion at the upper end in the figure, the buffer member 64b is deformed by being depressed by the pressure contact force 67E, but the amount of deformation is small. Therefore, the opening / closing body 64 is twisted and deformed so as to rotate in the direction of the arrow 80G around the E portion at the upper end, and in the B portion, the opening / closing body 64 is lifted from the contact portion 66 to generate a gap gap.

  As the opening / closing body 64 becomes longer in the longitudinal direction, the rigidity decreases, and such deformation is more likely to occur. Therefore, when the driving torque T is increased, the opening / closing body 64 is increasingly lifted from the contact portion 66 of the opening 62 in the central portion B, and the opening 62 cannot be closed even if the driving torque T is increased. There's a problem.

  That is, in the distribution of the pressing force shown in FIG. 14, the pressing force 67A, 67B, 67C in the vicinity of the drive shaft 61 shown in the lower side of the figure shows a tendency that the pressing force 67B at the center B portion is minimized. Here, as shown in FIG. 13, when the part B is lifted from the contact part, the pressure contact force 67B becomes zero.

  The elastic deformation of the opening / closing body 64 increases as the size of the opening / closing body 64, that is, the opening area of the opening 62 increases, and the deformation becomes easier as the longitudinal dimension of the opening / closing body 64 increases. . Further, when the opening / closing body 64 is a rectangular shape elongated in the longitudinal direction, the amount of deformation is particularly large.

  Also, as shown in FIG. 12 or FIG. 13, when the direction of warpage generated during resin molding of the opening / closing plate 64 a is the direction in which the B portion is lifted from the contact portion 66, a gap is generated due to the warpage and sealing cannot be performed. Here, there is a problem that even if the driving torque T is further increased, the opening / closing body 64 is formed in the direction of increasing the gap gap, and therefore cannot be sealed.

  Next, the structure of the freezer damper 50 according to the present invention will be described with reference to FIG. 22 as a representative example. FIG. 22 is a cross-sectional view for illustrating the relevance of the operation of the drive unit and the opening / closing body 64.

  The freezer compartment damper 50 of this embodiment is provided with an engaging portion 85 that extends in a direction opposite to the opening / closing body 64 (outward of the opening / closing body 64) with respect to the drive shaft 61 of the opening / closing body 64.

  In addition, an opening / closing body closing means 86 that performs an operation corresponding to the operation of the driving unit in the direction opposite to the opening 62 is provided in the vicinity of the drive shaft 61, and contacts the engaging portion 85 when the opening / closing body 64 closes the opening 62. It is like that.

  When the opening / closing body 64 closes the opening 62, the engaging portion 85 and the opening / closing body closing means 86 are in a positional relationship in contact with each other at the restriction portion 87.

  In FIG. 22, even when the driving torque T is applied to the drive shaft and a force in the direction of lifting from the contact portion 66 is applied to the opening / closing body 64, the engaging portion 85 and the opening / closing body closing means 86 are in contact with each other at the restriction portion 87. As a result, the engaging portion 85 is pushed in the direction of the upward arrow on the left side of FIG. 22, so that the opening / closing body 64 is pushed in the direction of the downward arrow on the right side of FIG. That is, the positional relationship is determined so that the engaging portion 85 and the opening / closing body closing means 86 are in contact with each other at the restricting portion 87 so that the buffer member 64b is appropriately pressed against the contact portion 66. Thereby, even if the opening / closing body 64 is enlarged to have a size and shape that is easily elastically deformed, or even when the driving torque T is increased, the opening / closing body 64 is not lifted and a gap is not generated. Therefore, it is possible to provide a highly reliable freezer compartment damper 50 that can reliably close the entire opening 62 by reducing the influence of variation in dimensions and variation in drive torque T.

  Accordingly, as shown in FIG. 19, the distribution of the pressure contact force 67 with the buffer member 64b around the contact portion 66 of the opening 62 becomes larger as compared with the case of FIG.

  Further, consider a case in which the opening / closing body 64 is rotated around the drive shaft and rotated to the open state. The movement of the opening / closing body closing means 86 when the opening / closing body 64 is opened is in the direction opposite to the arrow in FIG. 22, and the engaging portion 85 and the opening / closing body closing means 86 are separated from each other. It is suitable without any hindrance.

  The above effects can be obtained in the same manner even when the number of gears is changed or the place where the drive shaft is provided is changed as shown in FIG.

  Next, another embodiment will be described with reference to FIG. FIG. 24 is a cross-sectional view of the freezer damper 50. The configuration of FIG. 24 differs from the configuration shown in FIG. 22 in that the opening / closing body 46 and the engaging portion 85 and the opening / closing body closing means 86 are connected via a gear in the configuration of FIG. In the configuration of FIG. 24, the engaging portion 85 and the opening / closing body closing means 86 are mechanically independent. When the opening / closing body 64 is closed, the opening / closing body closing means 86 is operated so as to abut on the engaging portion 85 and the regulating portion 87. As a result of the opening / closing body closing means 86 acting on the engaging portion 85, the opening / closing body 64 is pressed in the direction of the opening 62, so that the freezer compartment damper 50 that is reliably closed and highly reliable as in the above-described configuration is provided. it can.

  Furthermore, it is preferable to determine the dimensions or the positional relationship so that the engagement portion 85 and the opening / closing body closing means 86 do not interfere during a series of opening / closing operations of the opening / closing body 64 without disturbing the operation of the opening / closing body 64. .

  In FIG. 24, there are two drive shafts for operating both the opening / closing body 64 and the opening / closing body closing means 86. However, as shown in FIGS. 25 and 26, the operation of the opening / closing body closing means 86 is performed. By moving the opening / closing body 64 to open and close the opening 62, the support shaft of the opening / closing body 64 can be a simple rotating shaft, not a drive shaft.

  As described above, the opening / closing body and the drive unit that are pivotally supported to be openable / closable are provided with a structure for pressing the opening / closing body toward the opening of the frame when the opening / closing body is closed. Thereby, the clearance gap produced between the flame | frame and opening-closing body at the time of closing an opening-closing body by the elastic deformation of an opening-closing body, and the curvature and twist which generate | occur | produce at the time of resin molding can be suppressed. Moreover, the opening of a damper can be closed reliably, the leak between the cold air supplied to a freezer compartment, and the cold air supplied to a refrigerator compartment or a vegetable compartment can be prevented, and the refrigerator which can aim at energy saving can be provided. Accordingly, it is possible to obtain a refrigerator capable of ensuring energy saving performance while maintaining the food storage temperature while maintaining the food in the refrigerator within a predetermined temperature range.

1 Refrigerator 2 Refrigerated room (refrigerated temperature zone)
3 Ice making room (freezing temperature zone)
4 Upper freezer room (freezing temperature room)
5 Lower freezer compartment (freezing temperature zone)
6 Vegetable room (refrigerated temperature room)
20 Refrigerating room damper 50 Freezing room damper 60 Driving means 61 Driving shaft 62 Opening 62a Connecting means 63 Frame 64 Opening and closing body 64a Opening and closing plate 64b Buffer member 65 Support shaft 66 Contact portion 67 Pressure contact force 70 Motor 71 Output shaft 72 Pinion gear 73 Idler gear 74 Idler Support point 75 Output gear 81 First protrusion 82 Second protrusion 83, 87 Restriction part 84 Recess 85 Engagement part 86 Opening and closing body closing means

Claims (5)

A frame having an opening;
A plate-like opening and closing body for opening and closing the opening;
Driving means for driving the opening / closing body around a rotation axis;
A damper device comprising: an opening / closing body closing means provided at a position opposite to the opening / closing body with respect to the rotating shaft and biasing the opening / closing body in a closing direction. The opening / closing body closing means includes:
An engaging portion that protrudes from the rotating shaft to the opposite side of the opening and closing body;
A driving force transmitting portion that biases the opening / closing body in a closing direction with the rotating shaft as a fulcrum by applying a driving force of the driving means to the engaging portion;
The damper device according to claim 1, comprising:   The driving force transmitting portion rotates about a driving shaft different from the rotation shaft of the opening / closing body and acts on the engagement portion to urge the opening / closing body in a closing direction. 2. The damper device according to 2. Opening / closing body opening means on the opposite side of the opening / closing body closing means from the drive shaft,
When rotating around the drive shaft in one direction, the opening / closing body closing means acts on the engaging portion to bias the opening / closing body in the closing direction, and the direction around the drive shaft is opposite to the one direction. 3. The damper device according to claim 2, wherein the opening / closing body opening means acts on the engaging portion to urge the opening / closing body in an opening direction when the opening / closing body is rotated.   A refrigerator comprising the damper device according to any one of claims 1 to 4.