JP4489725B2 - Door device and refrigerator - Google Patents

Description

  The present invention relates to a door device and a refrigerator provided with a door opening device that opens a door that freely closes a front opening of a housing.

  2. Description of the Related Art In recent years, there are some equipped with a door opening device in order to reduce the opening operation force of a refrigerator compartment door of a large-sized refrigerator (for example, see Patent Document 1).

  Hereinafter, the conventional door opening device will be described with reference to the drawings.

  FIG. 11 is a front view of a refrigerator equipped with a conventional door opening device. FIG. 12 is a longitudinal sectional view of an essential part of a refrigerator equipped with a conventional door opening device. FIG. 13 is a diagram showing the relationship between the propulsive force characteristics of a conventional door opening device and the door load. As shown in FIGS. 11 and 12, the heat insulating box 2 of the conventional refrigerator 1 has a front opening 2a. From the top, the refrigerator compartment 3, the vegetable compartment 4, the ice making compartment 5, the switching compartment 6, the freezer compartment 7 and a plurality of It is divided into storage rooms. However, the ice making chamber 5 and the switching chamber 6 are in a state where they are arranged side by side. The front opening 2a of each storage room closes each storage room when fully closed, and is connected to the heat insulating box 2 so that it can be opened and closed. The refrigerator door 3a, vegetable room door 4a, ice making room door 5a, switching room A door 6a and a freezer compartment door 7a are provided. The refrigerator door 3a is a revolving door that is pivotally connected to the heat insulating box 2 by a hinge 8 (not shown) at the right end of the refrigerator. The vegetable compartment door 4a, the ice making door 5a, and the switching room The door 6a and the freezer compartment door 7a are drawer doors connected to the heat insulating box 2 so as to be freely opened and closed in the front-rear direction.

  Further, a gasket 9 is provided on the inner peripheral side of each door, and the gasket 9 is held in a closed state by being attracted to the front opening 2a by the magnetic force of the magnet 10 provided in the gasket 9.

  Further, the left end portion opposite to the hinge 8 is operated by an ON signal output of an opening switch 12 (not shown) that senses the operation of the handle 11 disposed on the left side of the front of the refrigerator compartment door 3a. An electromagnetic solenoid 13 is provided as a door opening device that pushes the refrigerator compartment door 3a to open the refrigerator compartment door 3a.

  The electromagnetic solenoid 13 includes a coil 13a (not shown) formed in a cylindrical shape, a coil unit 13b in which the coil 13a is resin-molded, a yoke 13c provided in the coil unit 13b, and a coil unit 13b in the coil unit 13b. A magnetic plunger 13d provided so as to be movable in the axial direction in a penetrating state and a push rod 13e fixed on the front side coaxial with the plunger 13d and formed of a nonmagnetic metal are configured as main components. The yoke 13c is fixed to the heat insulating box 2, and the plunger 13d and the push rod 13e move together in the forward direction during operation.

  Further, the lower part of the electromagnetic solenoid 13 is provided in a recess 2b provided in the ceiling part of the heat insulating box 2, and the upper part is similarly covered with a cover 14 except for the protruding part of the push rod 13e.

  Further, a contact portion 3b is provided at a position facing the push rod 13e of the refrigerator compartment door 3a, and the contact portion 3b and the push rod 13e are always in contact with each other when the refrigerator compartment door 3a is fully closed.

  Further, as shown in FIG. 13, the first load for opening the refrigeration room door 3a by releasing the attracting force of the magnet 10 from when the refrigeration room door 3a is closed is about 2 kg · f at the maximum. The second load for opening 3a is rapidly reduced to 0.5 to 1 Kg · f and ½ or less.

  The maximum propulsive force of the electromagnetic solenoid 13 which is a conventional door opening device is set to correspond to the point at which the attracting force of the magnet 10 of the refrigerator compartment door 3a is released, and the maximum propulsive force is set to about 7 Kg · f. ing.

  About the door opening apparatus comprised as mentioned above, the operation | movement is demonstrated below.

  First, when the user operates the handle 9 and the door opening switch 12 outputs an ON signal, the electromagnetic solenoid 13 operates, and the push rod 13e moves forward a predetermined distance while pushing the abutting portion 3b. 3a is pushed and the refrigerator compartment door 3a is opened and opened.

At this time, it corresponds to the operation of the electromagnetic solenoid 13 corresponding to the first load necessary for opening the refrigerator compartment door 3a and the second load necessary for opening the refrigerator compartment door 3a after opening. The operation of the electromagnetic solenoid 13 is realized by the same means that the plunger 13d and the push rod 13e move instantaneously together.
Japanese Patent Laid-Open No. 2004-170070

  However, in the above conventional configuration, in addition to the force required to open the door from the fully closed state, a force for further increasing the door opening amount after opening the door is required, and the driving means is required to have a large capacity. In the door opening device, the driving means occupying most of the space becomes large, and as a result, the door opening device becomes large.

  In addition, the first load, which is the load required to open the door from the fully closed state, to the second load, which is the load for further increasing the door opening after the door is opened, is increased. It is said that there is a risk of impairing the safety of the user when the door is opened because the driving means with large capacity corresponding to the load of the second will cope with the second load, and the speed when the door is opened will increase. He also had problems.

  In particular, when the storage room is cooled like a refrigerator, the storage room has a negative pressure compared to the outside of the refrigerator, and a force to pull the door into the interior is generated, increasing the first load. When the conventional door opening device is used for the box door of the type in which the first load fluctuates due to changes in the outside air temperature, for example, at the time of storefront display where the interior is not cooled and stored at room temperature, The feeling of operation of the door opening operation differs from that during actual use when the interior is cooled, and the user may think that the quality of the door opening device is poor.

  Furthermore, in a general refrigerator, since the airtightness in the storage chamber at the time of closing the door is enhanced by generating an adsorption force between the refrigerator body and the door by a magnetic force, The load was even greater and the door opening device tended to be larger.

  The present invention solves the above-mentioned conventional problems, and provides a small door opening device that has a small drive means for the door opening function and can realize a stable and safe door opening operation regardless of the state of the door. The purpose is to do.

  In order to solve the above-described conventional problems, the door opening device of the present invention includes a plurality of drawers including a storage member that is engaged with an opening of a box and has a door provided on the front surface side, and the storage member is moved back and forth. A rail member that can move and a door opening device that opens the door, and the first load necessary to open the door from the fully closed state further opens the door after opening. The door opening device has a first operation having a large door opening force corresponding to the first load, and the first load corresponding to the second load. It has the characteristic which switches the 2nd operation | movement which has a door opening force smaller than operation | movement of this.

  As a result, the function of opening the door from when the door opening device is fully closed and the function of opening the door after opening the door can be handled by different means, compared to the case where each function is handled by the same means. Thus, the load on the door opening device can be reduced, and the door opening device can be reduced in size.

  In addition, since the opening force can be set according to each load, it is possible to prevent the door opening device from opening at a faster speed than necessary, and with the reduction of the load on the opening device. Thus, the ability of the driving means for driving the door opening device can be reduced, and the reliability of the door opening device can be improved.

  In addition, when the door is opened after the door is opened, the door is opened in the second operation without being affected by the magnitude or fluctuation of the first load by realizing the second operation corresponding to the second load. The operation can be set to perform the door opening operation at an arbitrary speed.

  The door opening device of the present invention can reduce the size of the drive means for the door opening function, and can ensure the safety and reliability of the door opening operation.

  The invention according to claim 1 includes a plurality of drawers provided with a storage member that is engaged with the opening of the box and provided with a door on the front side, a rail member that allows the storage member to move back and forth, A door opening device that opens the door, and a first load required to open the door from a fully closed state is greater than a second load required to open the door after the door is opened. The door opening device has a first operation having a large door opening force corresponding to the first load and a door opening force smaller than the first operation corresponding to the second load. It has the property of switching between the second operation, the function of opening the door from when the door opening device is fully closed, and the function of opening the door after opening the door can be handled by different means, Compared to the case where the same function is used to reduce the load on the door opening device, It can, it is possible to reduce the size of the door opening device. In addition, since the opening force can be set according to each load, it is possible to prevent the door opening device from opening at a faster speed than necessary, thereby improving the safety of the user. Can do. Moreover, the capability of the drive means for driving the door opening device can be reduced as the load on the door opening device is reduced, and the reliability of the door opening device can be improved.

  In addition, when the door is opened after the door is opened, the door can be opened at any speed without being affected by the magnitude or fluctuation of the first load by realizing the second action corresponding to the second load. Since the operation can be set to be performed, the second operation can be set to any convenient speed and the quality of the door opening device can be improved.

  According to a second aspect of the present invention, the door opening device is continuous from the first operation corresponding to the second load continuously after the first operation having a large door opening force corresponding to the first load. It is switched in stages so as to perform a second operation with a small opening force, and since it always has an opening force corresponding to a two-stage load, it can be opened even between different doors provided in multiple sections. A sense of unity of the door operation is obtained, and the quality of the door opening operation is improved, so that the usability of the door device can be greatly improved.

  The invention according to claim 3 is that the door opening device is disposed in a box substantially coaxial with the central axis in the width direction of the door, and can reduce the load required when the door is opened, and can be pulled out. By opening the door from the center of the door, the door can be opened with a good balance between left and right, and the reliability of the door opening device can be improved and the cost can be reduced.

  The invention according to claim 4 is provided with a plurality of the drawers and each is used in a different temperature zone, and the opening speed during the second operation corresponding to the second load is a drawer in a different temperature zone. The door opening operation is uniform even between different doors in multiple compartments, and the quality of the opening operation is improved, greatly improving the usability of the door device. be able to.

  According to the fifth aspect of the invention, the second operation uses the elastic member for the second operation having the door opening function by pressing and opening the door by moving the output shaft by the elastic force of the elastic member. As a result, the load on the driving means can be reduced, and the driving means can be reduced in size.

  According to the sixth aspect of the present invention, the maximum elastic force stored in the elastic member before the second operation is smaller than the maximum value of the first load of the door. The action can be prevented from acting, and the first action and the second action can be realized separately.

  According to the seventh aspect of the present invention, the first operation includes a power accumulation operation for storing an elastic force in the elastic member, and a connection operation for connecting the output shaft and the drive means to move the output shaft. Thus, the door opening time by the door opening device can be shortened by performing the accumulating operation during the first operation.

  In the invention according to claim 8, the elastic member has an initial elastic force even after the second operation, and the initial elastic force is larger than the second load of the door. In the movement stroke of the output shaft due to the elastic force, the door can be pushed against the second load until the end of the movement stroke, so that the door opening amount can be increased.

  In a ninth aspect of the present invention, the box is a heat insulating box made of a heat insulating wall, the front opening of the heat insulating box includes a door having a heat insulating wall, and the front opening and the door are magnetic. The heat insulation box is formed by being adsorbed by the heat insulation box, and the heat insulation box is held in a refrigeration temperature zone or a freezing temperature zone in the heat insulation box, according to any one of claims 1 to 8. By mounting the described door device on the refrigerator, the space between the storage room and the door is adsorbed by magnetic force, so the first load to open the door from the fully closed state is large, and in addition, the refrigeration temperature in the storage room If the cooling chamber is cooled down to the freezing temperature zone, the pressure in the storage chamber becomes negative compared to the outside air and the first load increases, so even if the first load that opens the door from when fully closed is increased, Affected by the first movement according to the load and the increase in the first load. It is possible to realize a door opening operation stably and safely since it is possible to perform the door opening operation while switching the second operation for door opening substantially at a constant speed without being able to be.

  Even if the first load fluctuates due to changes in the internal temperature or the outside air temperature, the door opening operation is performed at a substantially constant speed in the second operation without being affected by the fluctuation of the first load. Therefore, the door opening operation can be realized stably and safely.

  Also, even when the door opening device is arranged in the refrigerator storage chamber, the door opening device can be downsized, so the door opening device can be arranged without forming the storage chamber in a concave shape, Further, it is possible to prevent an increase in heat penetration from the outside that occurs when the storage chamber is formed in a concave shape, or a deterioration in usability due to a decrease in the food storage space of the refrigerator.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 is a front view of a refrigerator according to the first embodiment of the present invention, FIG. 2 is a longitudinal sectional view of a main part of the refrigerator according to the first embodiment, and FIG. 3 is a front sectional view of a main part of the refrigerator according to the first embodiment. 4 is a longitudinal sectional view of the door opening device of the same embodiment when the freezer is attached. FIG. 5 is a plan view of the door opening device according to the embodiment when the upper cover is removed at the initial stage. FIG. 6 is a plan view when the upper cover is removed when the first operation of the door opening device of the embodiment is completed. FIG. 7 is a plan view when the upper cover is removed when the second operation of the door opening device of the embodiment is completed. FIG. 8 is a diagram showing the relationship between the force required to open the vegetable compartment door of the embodiment and the door opening amount. FIG. 9 is a diagram showing the relationship between the force required to open the freezer compartment door and the door opening amount according to the embodiment.

  1 to 7, a heat insulating box 21 which is a box of the refrigerator 20 is filled with a foam heat insulating material 24 between an inner box 22 formed of resin and an outer box 23 formed of a metal magnetic body. It has a front opening 21a, and has partition walls 25, 26, 27, and 28, so that the refrigerator compartment 29, the ice making room 30, the switching room 31, the vegetable room 32, the freezing room 33, and a plurality of storage rooms are arranged from the top. Is forming. However, the ice making chamber 30 and the switching chamber 31 are arranged in parallel on the left and right, respectively.

  Further, each storage room is closed with the front opening 21a closed and connected to the heat insulation box 21, and each of the storage rooms has a cold storage door 29a, an ice making room door 30a, a switching room door 31a, a vegetable room door 32a, each having a heat insulation wall. A freezer compartment door 33a is provided. Further, the refrigerator compartment door 29a is rotatably connected to the heat insulating box body 21 by upper and lower hinges 34 and 35 each having a rotation axis at the right upper and lower ends, and the other storage compartment doors are drawer type. It is connected with the heat insulation box 21 so that it can be opened and closed in the direction.

  Further, the surface of each storage room door on the side of the heat insulation box 21 has a space 36 of about 5 mm between the front opening 21a when fully closed, and the space 36 is the surface of the side of each storage room door on the side of the heat insulation box 21. The gasket 37 can be brought into close contact with the front opening 21a by the magnetic force of the gasket 37 having magnets provided on the four sides of the top, bottom, left and right sides, and each storage chamber is sealed substantially hermetically.

  The heat insulating box 21 has a refrigeration cycle 38 (not shown) for cooling the refrigerator 20 during operation.

  Due to the action of the refrigeration cycle 38, the refrigerator compartment 29 and the vegetable compartment 32 are kept in a refrigeration temperature zone of about 5 ° C, and the ice making chamber 30, the switching chamber 31 and the freezer compartment are kept in a refrigeration temperature zone of about -18 ° C. Is set to be.

  In addition, rail members 39 are provided on both sides inside the vegetable compartment 32 and the freezer compartment 33.

  The rail member 39 includes a fixed rail 40 fixed to the heat insulating box 21 side and a moving rail 41 fixed to the vegetable compartment door 32a and the freezer compartment door 33a side.

  The fixed rail 40 is substantially U-shaped in cross section, and is provided from the vicinity of the front opening 21a to the vicinity of the back end of the vegetable chamber 32 and the freezing chamber 33 on both sides of the vegetable chamber 32 and the freezing chamber 33, and an open portion is provided. The fixed rails 40 are fixed to the inner box 22 so as to face each other.

  Further, two moving rails 41 are provided in the left-right direction at positions facing the left and right fixed rails 40 on the surface of the vegetable compartment door 32a and the freezer compartment door 33a on the side of the heat insulation box 21, and the vegetable compartment door 32a and the freezer compartment are provided. The door 33a moves with opening and closing in the front-rear direction.

  The vegetable compartment door 32 a and the freezer compartment door 33 a are connected to the heat insulating box 21 by inserting the left and right moving rails 41 into the open portions of the left and right fixed rails 40.

  The vegetable compartment 32 includes a vegetable compartment container 42 that has a top opening 42 a between the left and right moving rails 41 and accommodates food in the vegetable compartment 32.

  Similarly, a freezer compartment 43 for storing food in the freezer compartment 32 is provided between the left and right moving rails 41 of the freezer compartment 33 and having an upper surface opening 43a.

  The vegetable compartment container 42 and the freezer compartment container 43 are detachably provided on the left and right moving rails 41, respectively, and move as the vegetable compartment door 32a and the freezer compartment door 33a open and close in the front-rear direction.

  The vegetable room space 44 for circulating cold air inside the vegetable room 32 and the freezer compartment 33 by the operation of the freezing cycle 38 between the lower surface of the vegetable room container 42 and the freezer compartment container 43 and the bottom surface of the vegetable room 32 and the freezer room 33. , A freezer compartment space 45, and the vegetable compartment space 44 and the freezer compartment space 45 are each provided with a door opening device 50. The door opening device 50 is disposed on the center axis in the width direction of each of the vegetable compartment 32 and the freezer compartment 33.

  In addition, the door device in the present embodiment includes a heat insulating box 21, a vegetable compartment door 32a, a freezer compartment door 33a, and a door opening device 50 provided in each of the vegetable compartment 32 and the freezer compartment 33. Is done.

  The door opening device 50 pushes the vegetable compartment door 32a and the freezer compartment door 33a during operation to open the vegetable compartment door 32a and the freezer compartment door 33a, a spring 52 accommodated inside the output shaft 51, and moves during operation. A driving member 55 using a moving member 53 that compresses the spring 52, a gear 54 that engages with the moving member 53, an electric motor that generates power by energization and transmits the power to the gear 54, and an output shaft. 51, a lower case 56 having an upper surface opening for accommodating the spring 52, the moving member 53, the gear 54, and the driving means 55, an upper cover 57 for closing the upper surface opening of the lower case 56, and the driving means 55. The control means 58 for instructing the operation of the vegetable compartment 32 is configured as a main component, and the lower case 56 is respectively separated from the bottom of the partition wall 28 in the vegetable compartment 32 via a bush 59 formed of an elastic material such as rubber. , It is fixed to the inner box 22 in the state in which slightly away from the bottom surface of the inner box 22 of the freezing chamber 33.

  The front portion of the output shaft 51 protrudes from the lower case 56 through a lower case through hole 56a provided in the lower case 56, and moves substantially parallel to the opening direction of the vegetable compartment door 32a and the freezer compartment door 33a during operation.

  In addition, the output shaft 51 is always housed in the lower case 56 at the back of the output shaft 51 before and after the operation and during the operation to prevent the entry of dust and the like from the outside.

  Further, a cylindrical first concave portion 51a provided at the rearmost portion on the rear rear surface of the output shaft 51 and a first concave portion 51a provided on the front side of the first concave portion 51a and coaxial with the first concave portion 51a. A cylindrical second concave portion 51b having a small diameter, a flange 51c provided at an end of the second concave portion 51b on the first concave portion 51a side, a coaxial portion of the second concave portion 51b provided on the flange 51c and the second concave portion 51b. It has a hole 51d having a diameter smaller than that of the second recess 51b, and a cylindrical spring 52 is accommodated in the second recess 51b.

  The moving member 53 includes a shaft portion 53a that is inserted into the second recessed portion 51b after the spring 52 is accommodated in the second recessed portion 51b of the output shaft 51, and a rear portion of the shaft portion 53a that contacts the first recessed portion 51a during operation. A contact portion 53b that contacts and connects the output shaft 51 and the moving member 53 and an engagement portion 53c that is provided behind the contact portion 53b and engages with the gear 54 are provided.

  Further, a flange 53d having a diameter larger than that of the hole 51d of the output shaft 51 is provided at the distal end of the shaft 53a on the output shaft 51 side, and is configured so as not to be detached from the output shaft 51 during assembly.

  As a result, during operation, the output shaft 51, the spring 52, and the moving member 53 move in substantially the same straight line.

  Further, when the output shaft 51, the spring 52, and the moving member 53 are assembled, the depth L2 of the second recess 51b is smaller than the distance L1 between the bottom of the first recess 51a and the front surface of the contact portion 53b. It is set to be larger than the sum of L1 and the outer dimension L3 (not shown) at the time of maximum compression of the spring 52 and the thickness L4 of the flange portion 53d, and the moving member 53 is L1 when the door opening device 50 is operated. If it moves, the bottom part of the 1st recessed part 51a and the contact part 53b front surface will be contactable.

  In addition, the spring 52 is slightly compressed when assembled and inserted into the second recess 51b, has an initial elastic force of 1 kg · f, and the moving member 53 further moves L1 to contact the bottom of the first recess 51a. When the front surface of the contact portion 53b comes into contact, the maximum elastic force is set to be 2 kg · f.

  The gear 54 is disposed in the lateral direction of the moving member 53, and the driving means 55 is disposed on the opposite side of the gear 54 from the moving member 53.

  At the start of operation in accordance with an instruction from the control means 58, the drive means 55 is first moved in the forward direction, the gear 54 rotates in the forward direction, the moving member 53 moves forward, and then the drive means 55 is moved in the reverse direction. When the gear is rotated in the reverse direction, the moving member moves backward and returns to the initial state again.

  At this time, the force of the drive means 55 is expanded by the gear 54, and the moving member 53 is set so that a force of 5 kg · f is applied.

  The door opening device 50 is fixed to the center of the heat insulating box 21 in the left-right direction in the vicinity of the front opening 21a of the vegetable room space 44 and the freezing room space 45, and when fixed, the gasket 37 for the vegetable room door 32a and the freezing room door 33a. The output shaft 51 is configured to push the upper side from the upper end of the lower side.

  Further, the vegetable compartment door 32a and the freezer compartment door 33a are provided with a contact portion 32b and a contact portion 33b at positions facing the output shaft 51, respectively, and the contact portion when the vegetable compartment door 32a and the freezer compartment door 33a are fully closed. 32b, the contact portion 33b and the tip of the output shaft 51 are set to have a space of about 5 mm.

  In addition, a handle 32c and a handle 33c for manually opening and closing the vegetable compartment door 32a and the freezer compartment door 33a, and a handle 32c and the vicinity of the handle 33c, respectively, are provided at the upper front portions of the vegetable compartment door 32a and the freezer compartment door 33a. An opening switch 32d and an opening switch 33d that senses a user's pressing during operation of the refrigerator 20 and outputs an operation ON signal of the door opening device 50 are provided. An operation ON signal of the opening switch 32d and the opening switch 33d is provided. Is transmitted to the control means 58 of the door opening device 50, the door opening device 50 starts its operation.

  At this time, for example, when the vegetable compartment door 32a is opened, the door opening switch 33d of the freezer compartment door 33a is controlled so as not to operate the door opening device 50 in the freezer compartment 33 even if it feels pressed. It is set so that the two doors cannot be opened simultaneously by the door opening device 50.

  If it is necessary to open the freezer compartment door 33a when the vegetable compartment door 32a is open, the vegetable compartment door 32a is once closed and the door opening switch 33d of the freezer compartment door 33a is pushed to open the freezer compartment door 33a. The door opening device 50 may be operated or manually opened by the handle 33c of the freezer compartment door 33a.

  8 and 9, when the vegetable compartment door 32a and the freezer compartment door 33a are fully closed, the moment when the adsorption force of the gasket 37 is released due to the magnetic force when the vegetable compartment door 32a and the freezer compartment door 33a are opened. , Points B1 and B2, respectively, positions C1 and C2 where the suction force of the gasket 37 is completely released, points D1 and D2 are positions where the vegetable compartment door 32a and freezer compartment door 33a are completely opened, respectively. To do.

  When trying to open the door from the A1 point and the A2 point when the vegetable compartment door 32a and the freezer compartment door 33a are fully closed, a large force is required at the points B1 and B2 due to the adsorption force of the gasket 37. When the suction force is released, the necessary force is suddenly reduced to points C1 and C2, and then the vegetable compartment door with a force corresponding to the sliding force between the fixed rail 40 and the moving rail 41 when the door is opened. 32a and the freezer compartment door 33a can be opened up to the points D1 and D2 in the fully opened position.

  At this time, the maximum values of the first load necessary to open the vegetable compartment door 32a and the freezer compartment door 33a are B1 and B2, and the vegetable compartment door 32a and the freezer compartment door 33a are opened after the door is opened. The second load necessary for the above is represented by the points C1, C2, D1, and D2.

  The maximum load of the first load is ensured so that the adsorbing power of the gasket 37 is ensured when the refrigerator 20 is used for a long period of time, and the vegetable compartment door 32a and the freezer compartment door 33a are not easily opened even when other doors are strongly closed. Both values are set to a force of 3 Kg · f, both the second loads are 0.7 Kg · f, the first load is large, and the first load is about 4.3 times the second load. Will have double the load.

  In addition, when the vegetable compartment 32 is cooled by the operation of the refrigeration cycle 38, the inside of the vegetable compartment 32 becomes slightly negative with respect to the outside air due to the temperature difference with the outside air temperature outside the refrigerator, and the first load is 0. Since the increase is about 5 kg · f, the magnification of the first load with respect to the second load is further increased. Further, in the freezer compartment 33 set in the freezing temperature zone, the temperature difference further increases, and the negative pressure with respect to the outside air inside the freezer compartment 33 increases, so that the first increase in the freezer compartment 33 due to the operation of the refrigerating cycle. Is 1 kg / f, and the amount of increase in the first load is larger than that in the vegetable compartment 32.

  The operation | movement and effect | action are demonstrated below about the door opening apparatus with which the refrigerator comprised as mentioned above was equipped.

  8 and 9 show the relationship between the propulsive force of the door opening device 50 of the present embodiment, the propulsive force of the conventional door opening device 13, and the opening amounts of the vegetable compartment door 32a and the freezer compartment door 33a.

  When the user presses the opening switch 32d of the vegetable compartment door 32a, for example, when the refrigerator 20 is operated, the door opening device 50 operates, and the output shaft 51 pushes the contact portion 32b of the vegetable compartment door 32a, thereby causing the vegetable compartment door 32a. Is released.

  At this time, when the vegetable compartment door 32a is opened, the door opening device 50 in the freezer compartment 33 does not operate, and the freezer compartment door 33a is manually opened. Thus, the malfunction of the door opening device 50 is prevented by operating a plurality of door opening devices 50 at the same time, and the safety of the user is further improved.

  When the vegetable compartment door 32a is opened by the door opening device 50, the door opening device 50 first receives the ON signal of the door opening switch 32d by the control means 58, operates the driving means 55 in the forward direction, and the gear 54. Rotates in the forward direction and the moving member 53 moves in the forward direction to start the first operation for opening the vegetable compartment door 32a.

  In the first operation, first, the output shaft 51, the spring 52, and the moving member 53 move together by 5 mm, reach the point A1 in FIG. 8, and the tip of the output shaft 51 is the contact portion 32b of the vegetable compartment door 32a. Abut.

  During this time, the spring 52 moves with little compression.

  When the tip of the output shaft 51 comes into contact with the contact portion 32b of the vegetable compartment door 32a, the moving member 53 further moves the distance L1 by the operation of the driving means 55 in the positive direction, and the bottom of the first recess 51a. The output shaft 51 and the moving member 53 are connected with the front surface of the contact portion 53b, and the force of the drive means 55 is transmitted to the output shaft 51.

  While the moving member 53 moves the distance L1, the maximum value of the first load necessary to open the vegetable compartment door 32a is 3 kg · f, whereas the maximum elastic force stored in the spring 52 is 2 kg. Since it is f, the output shaft 51 can push the vegetable compartment door 32a only by slightly extending the gasket 37 of the vegetable compartment door 32a, and is apparently stopped. 52 is compressed until it has maximum elasticity.

  After the output shaft 51 and the moving member 53 are coupled, the point E in FIG. 8 is reached and a force of 5 kg · f is transmitted from the driving means 55 to the output shaft 51 so that the output shaft 51 remains coupled to the moving member 53. The vegetable compartment door 32a is opened by moving in the forward direction for a distance of L5 (not shown) up to the maximum F1 point, and the first operation is completed.

  Actually, in the present embodiment, before reaching F1, the vegetable compartment door 32a passes through the point B2 over the opening point B1, and the load decreases from the vegetable compartment door 32a from the B1 point to the C1 point. The first operation is completed at the moment when the point G2 that reaches 2Kg · f is reached.

  At this time, even when the vegetable compartment 32 is cooled by the action of the refrigeration cycle 38 and the first load becomes about 3.5 kg · f, the force capable of opening the vegetable compartment door 32a is transmitted to the output shaft 51. Therefore, the function of the door opening device 50 can be satisfied even when the refrigerator 20 is in use.

  At this time, when the freezer compartment door 33a is opened by the door opening device 50 when the vegetable compartment door 32a is fully closed, in FIG. 9, the freezer compartment door 33a passes through the point F3 overcoming the point B2. The first operation is completed at the moment when the freezer compartment door 33a reaches point G3 where the load decreases from point B2 to point C2 and reaches 2 kg · f.

  Further, even when the freezing chamber 33 is cooled by the action of the freezing cycle 38 and the first load becomes about 4 Kg · f, the force that can open the freezing chamber door 33 a is transmitted to the output shaft 51. Even when the refrigerator 20 is in use, the function of the door opening device 50 can be satisfied.

  At the moment when the first operation is completed, the second operation for opening the vegetable compartment door 32a starts to work.

  In the second operation, since the second load capable of opening the vegetable compartment door 32a is 0.7 kg · f, the maximum elastic force stored in the spring 52 is 2 kg · f. At the moment when the point G2 is reached, the output shaft 51 is moved by the distance L1 while further pressing the contact part 32b of the vegetable compartment door 32a by the elastic force of the spring 52, reaches the point H2, and stops after completing the second operation. However, the vegetable compartment door 32a is greatly opened by receiving the elastic force.

  At this time, since the initial elastic force of the spring 52 is set to 1 Kg · f and larger than the second load, the vegetable compartment door 32a always resists the second load while the output shaft 51 moves the distance L1. You can keep pressing.

  On the other hand, when the freezer compartment door 33a is opened by the door opening device 50 when the vegetable compartment door 32a is fully closed, the output shaft 51 of the spring 52 is at the moment of reaching the point G3 in FIG. While pressing the abutting portion 33b of the freezer compartment door 33a by elastic force, it moves for a distance of L1 and reaches the point H3 to complete the second operation and stop. However, the freezer compartment door 33a is largely opened by receiving the elastic force. Will be.

  At this time, since the initial elastic force of the spring 52 is set to 1 Kg · f and larger than the second load, the vegetable compartment door 32a always resists the second load while the output shaft 51 moves the distance L1. , The freezer compartment door 33a can be continuously pushed.

  Further, since the operation of the output shaft 51 by the elastic force of the spring 52 is faster than the operation of the output shaft 51 by the driving means 55, the connection between the output shaft 51 and the moving member 53 is released during the second operation. .

  From the first operation to the second operation, the driving means 55 only needs to operate in the forward direction until the output shaft 51 moves a distance L5 in the forward direction while being connected to the moving member 53 in at least the first operation. .

  When the second operation is completed, the drive unit 55 operates in the reverse direction according to the instruction of the control unit 58, and the moving member 53 is moved backward by rotating the gear 54 in the reverse direction.

  At this time, the flange portion 53d of the moving member 53 and the flange 51c of the output shaft 51 move in contact with each other and return to the initial state.

  Further, as shown in FIGS. 8 and 9, the maximum propulsive force of the door opening device 50 according to the present embodiment can be made 2 Kg · f smaller than the maximum propulsive force of the conventional door opening device 13.

  As described above, in the present embodiment, the first load necessary to open the door from the fully closed state is larger than the second load necessary to open the door after the door is opened and more than twice (this embodiment In the door opening device 50 that opens the vegetable compartment door 32a and the freezer compartment door 33a having a load of about 4.3 times in the form, the door opening device 50 performs the first operation corresponding to the first load and the second operation. By having the second operation corresponding to the load, the door opening function for opening the door from when the door opening device 50 is fully closed and the door opening function for further opening the door after opening will be handled by different means. Compared with the case where each function is handled by the same means, the greatest ability is required, and the ability of the drive means 55 for the door opening function that occupies most of the space of the door opening device can be reduced. Can be miniaturized.

  That is, the first operation of opening the door from the fully closed state is performed by the movement of the output shaft 51 by the driving means 55, and the second operation of opening the door after the door is opened is further performed by the spring 52. Compared with the case where the opening is performed by the movement of the output shaft 51 by the driving means 55, the load applied to the driving means 55 can be reduced, and the door opening device can be downsized.

  In the present embodiment, the first load has a load that is about 4.3 times the second load. However, the load is reduced to about 1.5 times depending on the assembly variation of the refrigerator 20 and the operating condition of the refrigeration cycle 38. Sometimes.

  Further, in the conventional door opening device, when the magnification of the first load with respect to the second load is increased, the door opening operation is accelerated and there is a risk of impairing the safety of the user. 50 is determined by the setting of the maximum elastic force and the initial elastic force of the spring 52 of the door opening device 50, so that the second operation for realizing the door opening operation is almost unaffected by the magnitude of the first load. The door opening operation is performed at a constant speed, and the door opening operation can be realized safely even when the magnification of the first load with respect to the second load is large. Therefore, since the opening speed of the door is too high, it is possible to avoid a danger of hitting the user, and the safety of the door opening operation can be improved.

  Further, in the conventional door opening device, when the door opening device corresponding to the door having a large first load is also used as a door having a small first load, the door opening operation becomes faster. In this case, even when the vegetable compartment door 32a and the freezer compartment door 33a differ in the first load due to the operation of the refrigeration cycle 38, the door opening device 50 of the present embodiment performs the second operation for realizing the door opening operation. Since it is determined by setting the maximum elastic force and the initial elastic force of the spring 52 of the door opening device 50, if the second load is the same, it is almost constant and the same without being influenced by the magnitude of the first load. Since the door opening operation is performed at a speed, a sense of unification of the door opening operation is obtained, and the usability of the door device can be greatly improved by improving the quality of the door opening operation.

  Specifically, for example, in the freezer compartment 33 in which negative pressure is generated due to the low internal temperature and the load on the door is large, the pressing force of the output shaft 51 by the driving means 55 which is the first operation is set large. In the vegetable compartment 32 having a smaller load than the freezer compartment 33, the pressing force applied to the output shaft 51 is set to be small, and if the load applied to the second operation is approximately the same, the elastic force of the spring 52 is applied to the vegetable compartment 32. By setting the chamber 32 and the freezing chamber 33 to the same value, almost the same opening force can be obtained, and the opening speed during the second operation between different doors can be made substantially the same. The quality in the opening operation can be improved.

  As described above, when a plurality of storage rooms are provided, the first load caused by opening the doors varies greatly depending on factors such as the temperature zone in the storage room and the capacity between the plurality of doors. The door opening operation in the second operation can be set to perform the door opening operation at an arbitrary speed without being affected by the magnitude or fluctuation of one load. Further, in the case of the refrigerator 20, the refrigerator 20 is not operated at the time of store display, and further, heavy objects are often not stored in the vegetable compartment container 42 and the freezer compartment container 43. However, in actual use, the vegetable compartment 32 and the freezer compartment are not stored. When the inside 33 is cooled, the vegetable compartment 32 and the freezer compartment 33 become negative pressure, or the first load increases or fluctuates by storing heavy items such as beverage bottles frozen in the freezer compartment 42. I will do.

  Thus, even when the first load varies in the same door, the second operation for realizing the door opening operation is determined by the setting of the maximum elastic force and the initial elastic force of the spring 52 of the door opening device 50. The door opening operation is performed at a substantially constant speed without being affected by the fluctuation of the first load, and substantially the same door opening operation can be realized even if the first load fluctuates.

  On the other hand, the door can be opened reliably by performing the first operation by the driving means 55, and the time required from the fully closed time to the door opening can be substantially stabilized.

  Moreover, in the 2nd operation | movement of the door opening apparatus 50, the output shaft 51 is moved by the elastic force of the spring 52, and the vegetable compartment door 32a and the freezer compartment door 33a are pushed and opened, The 2nd which has a door opening function. By using the spring 52 for the operation, the load on the driving unit 55 can be reduced, and the driving unit 55 can be downsized.

  In addition, since the maximum elastic force stored in the spring 52 before the second operation is smaller than the maximum value of the first load of the vegetable compartment door 32a and the freezer compartment door 33a, the maximum elastic force of the spring 52 is reduced. By setting, the second operation can be prevented from acting during the first operation, and the first operation and the second operation can be realized separately.

  Further, the first operation includes an accumulation operation for accumulating an elastic force in the spring 52, and a connection operation for moving the output shaft 51 by connecting the output shaft 51 and the driving means 55. By performing during the first operation, the opening time of the freezer compartment door 33a by the door opening device 50 can be shortened.

  In addition, the spring 52 has an initial elastic force after the second operation, and the initial elastic force is larger than the second load of the vegetable compartment door 32a and the freezer compartment door 33a. At the moving distance L1 of the output shaft 51 by the elastic force, the vegetable room door 32a and the freezing room door 33a can be kept pressed against the second load until the end of the moving distance, so the vegetable room door 32a and the freezing room door 33a. The opening amount of can be increased.

  Further, in the present embodiment, since the second operation is performed continuously after the first operation, the door opening operation is smooth and the door opening force according to the two-stage load can be obtained.

  Further, since the door opening device 50 is disposed in the inner box 22 of the heat insulating box 21 that is substantially coaxial with the central axis in the width direction of the freezer compartment door 33a, which is a door, both left and right ends of the freezer compartment door 33a. The cost can be reduced as compared with the case where two door opening devices 50 are arranged to push the parts simultaneously.

  Further, by mounting the door opening device 50 on the refrigerator 20, by arranging the small door opening device 50 in the storage chamber of the refrigerator 20, an increase in heat intrusion from the outside due to the depression of the storage chamber, or Usability deterioration due to a decrease in the food storage space of the refrigerator 20 can be prevented.

  In the present embodiment, the second load necessary to open the vegetable compartment door 32a and the freezer compartment door 33a after opening is 0.7 kg · f, but the second load is larger than that. In this case, the door opening amount due to the elastic force of the spring 52 is reduced.

  At this time, in order to increase the door opening amount, the opening amount of the vegetable compartment door 32a and the freezer compartment door 33a can be increased by setting the initial elastic force larger than that of the present embodiment.

  At that time, when the maximum elastic force needs to be set larger than that of the present embodiment, the door opening device 50 can satisfy the function if the maximum elastic force is equal to or less than the maximum value of the first load.

(Embodiment 2)
FIG. 10 is a diagram showing a door opening device used in the refrigerator in Embodiment 2 of the present invention, and FIGS. It is an expanded view of a transmission mechanism, and explanatory drawing which shows the state which the 1st car and the 2nd car connected directly. Note that the basic configuration of the present embodiment is the same as that of the first embodiment, and thus description of common portions is omitted.

  As shown in FIGS. 10A and 10B, the door opening device 50A used in the refrigerator of this embodiment pushes the vegetable compartment door 32a and the freezer compartment door 33a during operation so that the vegetable compartment door 32a and the freezer compartment door 33a are pushed. The output shaft 51 to be opened, the spring 52 (elastic member) made of a coil spring for biasing the vegetable compartment door 32a and the freezer compartment door 33a, the spring 52 is compressed at a predetermined timing during operation, and the output shaft 51 is A transmission mechanism 40 to be moved; a drive means 55 comprising an electric motor for driving the output shaft 51 and the spring 52 via the transmission mechanism 40; a control means 58 for controlling the drive means 55; an output shaft 51; a spring 52; The lower case 56 in which the transmission mechanism 40, the drive means 55, and the control means 58 are housed, and the upper cover 57 that covers the lower case 56 are configured as main components. The distal end portion of the output shaft 51 protrudes from the lower case 56 through a lower case through-hole 56a provided in the lower case 56. During operation, the vegetable chamber door 32a and the freezer compartment door 33a are opened (directions indicated by arrows L). It is arranged to be movable. The output shaft 51 is guided in the axial direction by a rail-shaped guide 511. In addition, although the sensor apparatus etc. which monitor the position of the output shaft 51 directly or indirectly are comprised in the case, illustration and description are abbreviate | omitted about this sensor apparatus.

  The transmission mechanism 40 includes a worm gear 41 connected to an output shaft 51 of an electric motor that constitutes the driving means 55, a first wheel 42 having external teeth that mesh with the worm gear 41, and a coaxial shape with the first wheel 42. The second wheel 43 arranged in an overlapping manner, the third wheel 44 having external teeth meshing with the pinion of the second wheel 43, and a rack 510 formed on the output shaft, are constituted by the pinion of the third wheel 44 And the rack 510 of the output shaft 51 are engaged with each other.

  In this embodiment, the first wheel 42 and the second wheel 43 are rotatably supported around a common support shaft 47. Further, a first protrusion 420 that holds one end of the spring 52 is formed on the upper surface of the first wheel 42, and a second protrusion 430 that holds the other end of the spring 52 is formed on the lower surface of the second wheel 43. Has been. Here, the first protrusion 420 and the second protrusion 430 are located on the same radius as viewed from the support shaft 47. For this reason, in the state shown in FIG. 10A, the first protrusion 420 and the second protrusion 430 do not interfere with each other, and the first wheel 42 and the second wheel 43 are mechanically connected via the spring 52. It is connected to the. At this time, the spring 52 is connected to the first wheel 42 and the second wheel 43 in a state where the spring 52 is slightly wound and has an initial elastic force. On the other hand, when the first wheel 42 rotates while a large load is applied to the second wheel 43, the first wheel 42 rotates while the spring 52 is tightened, as shown in FIG. In addition, after the first protrusion 420 and the second protrusion 430 interfere with each other, the first wheel 42 directly transmits the rotational force to the second wheel 43 through the first protrusion 420 and the second protrusion 430. .

  In the door opening / closing device 50A configured as described above, when the vegetable compartment door 32a and the freezer compartment door 33a are closed, as shown in FIG. 10 (A), the main shaft 51 has the vegetable compartment door 32a and the freezer compartment door 33a. In a retracted position away from In this state, the first protrusion 420 and the second protrusion 430 are separated and do not interfere with each other.

  From this state, when opening the vegetable compartment door 32a and the freezer compartment door 33a, the electric motor which comprises the drive means 55 is operated. Thereby, the worm gear 41 connected to the output shaft 51 rotates, and the rotation is transmitted to the first wheel 42. In this state, since the output shaft 51 is not in contact with the vegetable compartment door 32a or the freezer compartment door 33a, a large load is not applied to the output shaft 51. Accordingly, since a large load is not applied to the third wheel 44 and the second wheel 43, the clockwise CCW rotation of the first wheel 42 is transmitted to the second wheel 43 via the spring 52. The rotation of the second wheel 43 is transmitted to the third wheel 44 and the output shaft 51. As a result, the output shaft 51 moves forward toward the vegetable compartment door 32a and the freezer compartment door 33a as indicated by an arrow L. .

  Next, when the tip of the output shaft 51 comes into contact with the vegetable compartment door 32a or the freezer compartment door 33a, a large load is applied to the output shaft 51. That is, since the adsorbing force such as a gasket or a magnet is applied to the vegetable compartment door 32a or the freezer compartment door 33a in the fully closed state, to open the vegetable compartment door 32a or the freezer compartment door 33a in the fully closed state. Great power is needed. Therefore, a large load is applied to the output shaft 51 when the vegetable compartment door 32a or the freezer compartment door 33a is opened. Accordingly, since a large load (first load) is also applied to the third wheel 44 and the second wheel 42, the spring 52 is tightened when the first wheel 42 rotates in this state.

  Then, when the first protrusion 420 and the second protrusion 430 interfere with each other due to the rotation of the first wheel 42, the first wheel 42 directly rotates the second wheel 43, and the rotation is changed from the second wheel 43 to the third wheel. It is transmitted to the output shaft 51 via the vehicle 44. As a result, the output shaft 51 can open the vegetable compartment door 32a and the freezer compartment door 33a by the large force of the electric motor that constitutes the driving means 55.

  The above is the first operation in the present invention, and then the second operation is started. That is, after the vegetable compartment door 32a and the freezer compartment door 33a are opened, the rotation of the electric motor constituting the driving means 55 is stopped. For this reason, the first wheel & pinion 42 stops and the first protrusion 420 stops. As a result, the spring 52 exhibits the spring force accumulated so far as a force for rotating the second wheel & pinion 43. At this point, the vegetable compartment door 32a and the freezer compartment door 33a are slightly open, and no large force is required to open the vegetable compartment door 32a or the freezer compartment door 33a. Only a small load (second load) is applied to 43. Therefore, the second wheel 43 and the third wheel 44 can be rotated only by the spring force of the spring 52, and the output shaft 51 further opens the vegetable compartment door 32a and the freezer compartment door 33a only by the spring force of the spring 52. It will be. Since the maximum elastic force stored in the spring 52 before the second operation is smaller than the maximum value of the first load, the second operation does not start during the first operation.

  And while the vegetable compartment door 32a and the freezer compartment door 33a are opening large, in the drive means 55, an electric motor reversely rotates and it returns to the state shown to FIG. 10 (A).

  Thus, in the refrigerator, the first load required to open the vegetable compartment door 32a and the freezer compartment door 33a from the fully closed state further opens the vegetable compartment door 32a and the freezer compartment door 33a after the door is opened. The door opening device 50A according to the present embodiment is larger than the second load necessary for the first load, and the first operation having a large door opening force corresponding to the first load and the first load corresponding to the second load. A second operation having an opening force smaller than the operation is continuously performed. The door opening device 50A opens the door by pushing the vegetable compartment door 32a or the freezer compartment door 33a by moving the output shaft by the driving means in the first operation, and outputs by the elastic force of the spring 52 in the second operation. Since the vegetable compartment door 32a and the freezer compartment door 33a are pushed and opened by moving the shaft 51, a force suitable for opening the vegetable compartment door 32a and the freezer compartment door 33a is exhibited. Furthermore, since the maximum elastic force stored in the spring 52 before the second operation is smaller than the maximum value of the first load, the door opening device 50A indicates that the second operation acts during the first operation. The first operation and the second operation can be realized separately.

  Although the above embodiment has been described with reference to the refrigerator, the door device of the present embodiment can be applied to various storage devices including a door device that opens and closes the opening of the box. As in the case of a refrigerator, it can be made to act particularly effectively on what is provided with a magnet and is substantially sealed, and what closes the door with a latch or the like.

  As described above, the door opening device according to the present invention can safely and stably open the door having the first load necessary for the door opening operation and the second load necessary for the door opening operation. It can also be applied to uses such as a heat insulation cabinet equipped with furniture and furniture having a magnet catch.

Front view of the refrigerator in Embodiment 1 of the present invention Main part longitudinal cross-sectional view of the refrigerator of the embodiment Front sectional view of main parts of the refrigerator according to the embodiment Longitudinal sectional view of the door opening device of the same embodiment when the freezer is installed The top view at the time of the upper cover removal at the time of the initial stage of the door opening device of the embodiment The top view at the time of the upper cover removal at the time of completion of the 1st operation | movement of the door opening apparatus of the embodiment The top view at the time of the upper cover removal at the time of completion of the 2nd operation | movement of the door opening apparatus of the embodiment The figure which shows the relationship between the force required in order to open the vegetable compartment door of the embodiment, and door opening amount The figure which shows the relationship between the force required in order to open the freezer compartment door of the embodiment, and door opening amount (A) The figure which shows the door opening apparatus used for the refrigerator in Embodiment 2 of this invention (B) The figure which shows the door opening apparatus used for the refrigerator of the embodiment (C) For the refrigerator of the embodiment Figure showing the door opening device Front view of a refrigerator equipped with a conventional door opening device Longitudinal cross-sectional view of the main part of a refrigerator equipped with a conventional door opening device The figure which shows the relationship between the driving force characteristic of the conventional door opening device and the load of the door

Explanation of symbols

20 refrigerator 21 heat insulation box 21a front opening 32 vegetable room 32a vegetable room door 33 freezing room 33a freezing room door 35 lower hinge 37 gasket 39 rail member 40 fixed rail 41 moving rail 50, 50A door opening device 51 output shaft 52 spring 53 Moving member 54 Gear 55 Driving means

Claims (9)

A plurality of drawers provided with a storage member engaged with the opening of the box body and provided with a door on the front side; a rail member that enables the storage member to move back and forth; and a door opening device that opens the door. A first load required to open the door from a fully closed state is greater than a second load required to further open the door after opening, the door opening device Has a characteristic of switching between a first operation having a large door opening force corresponding to the first load and a second operation having a door opening force smaller than the first operation corresponding to the second load. And the door opening device has an output shaft that performs an opening operation, and the output shaft by the second operation performs a faster operation than the main shaft by the first operation . The door opening device has a second door opening force that is smaller than the first operation corresponding to the second load continuously after the first operation having a large door opening force corresponding to the first load. The door device according to claim 1, wherein the door device is switched step by step so as to perform an operation. The door device according to claim 1, wherein the door opening device is disposed on a central axis in a width direction of the door. A plurality of the drawers are used and each is used in a different temperature zone, and the opening speed in the second operation corresponding to the second load is substantially constant between the drawers in different temperature zones. The door apparatus as described in any one of Claim 3. The door opening device includes an output shaft that contacts the door during operation and pushes the door, a drive unit that is connected to the output shaft and moves the output shaft, and an elastic member that moves the output shaft by elastic force. And in the first operation, the door is pushed by moving the output shaft by the driving means, and in the second operation, the door is moved by moving the output shaft by the elastic force of the elastic member. The door device according to any one of claims 1 to 4, wherein the door device is opened by pushing. The door device according to claim 5, wherein a maximum elastic force stored in the elastic member before the second operation is smaller than a maximum value of the first load. The door opening device includes a moving member that moves during operation and compresses the elastic member. During the first operation, the output shaft, the elastic member, and the moving member move in substantially the same straight line to be elastic to the elastic member. The door device according to claim 5 or 6, wherein a power storage operation for storing power is performed . The door device according to any one of claims 5 to 7, wherein the elastic member has an initial elastic force even after the second operation, and the initial elastic force is larger than a second load of the door. The box is a heat insulating box made of a heat insulating wall, and the front opening of the heat insulating box includes a door having a heat insulating wall, and the front opening and the door are substantially sealed by being adsorbed by a magnetic force. A refrigerator in which the door device according to any one of claims 1 to 8 is mounted on the heat insulating box body that is formed in a heat insulating compartment that is held in a refrigeration temperature zone or a freezing temperature zone.

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