JP2015166664A - refrigerator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a refrigerator including a compact opening/closing device capable of automatically opening/closing a door at high speed, high accuracy and low noise, and to provide the refrigerator enabling both automatic opening/closing and manual opening/closing, and capable of safely stopping the door when it comes into contact with a body and the like.SOLUTION: A refrigerator 1 includes: a drawer type door 11; an opening/closing device 20 for opening/closing the door 11; and a control device 50 for controlling the opening/closing device 20. The opening/closing device 20 has: pulleys 30-39 provided in a rotatable manner respectively; a wire 25 which is installed between the pulleys 30-39 and in which at least one portion forms a linear part 25a extending along a movement direction of the door 11; a clamp 26 fixed at the linear part 25a and engaging the wire 25 and the door 11 in a detachable manner; a rotatable take-up rotor 23 in which both end parts 25c, 25d of the wire 25 are wound in a reverse rotation direction and fixed respectively; and a normally and reversely rotatable motor 22 connected to the take-up rotor 23.

Description

  The present invention relates to a refrigerator provided with an opening / closing device that automatically opens and closes a drawer-type door.

  As a refrigerator of this type, for example, Patent Document 1 discloses a refrigerator having an automatic drawer device using a rack and pinion mechanism. The refrigerator disclosed in this document includes a rack that is fixed to the lower surface of the drawer container, a gear (pinion) that engages with the rack, and a drive motor that drives the gear. Then, the gear is rotated by the drive motor, the power of the drive motor is transmitted from the gear to the rack, and the drawer container fixed to the rack is moved.

  Patent Document 2 discloses that a drawer-type door of a refrigerator is opened and closed using a ball screw mechanism. That is, the refrigerator described in the document includes a screw shaft that is connected to a motor and extends in the moving direction of the door, and a movable nut that is screwed into the screw shaft. The movable nut is connected to a movable rail of the vegetable compartment door via a joint plate. Thereby, the said motor can be driven and the said door can be opened and closed.

Japanese Patent Laid-Open No. 02-146487 (page 2-3, FIG. 1) JP 2008-8550 A (Page 4-5, FIG. 1)

  However, in the above-described conventional refrigerator, it is difficult to arrange the opening / closing device in a compact manner while ensuring a long automatic opening / closing stroke of the door. When the switchgear is increased in size, there is a problem that the effective storage capacity of the storage chamber is reduced.

  For example, as in the prior art disclosed in Patent Document 1, when using a rack and pinion mechanism, it is necessary to arrange a pinion gear at the front of the refrigerator in order to ensure a large opening / closing stroke. If it does so, a drive motor etc. will also be arrange | positioned in the front part of a refrigerator, and the storage capacity of the storage chamber front part will reduce.

  Here, for example, a power transmission mechanism such as a belt may be provided, and the drive motor may be disposed in the dead space at the rear of the storage chamber. However, when such a power transmission mechanism is provided, a new space for arranging the mechanism is required. In addition, the power transmission mechanism becomes complicated, leading to a decrease in productivity and an increase in production cost due to an increase in the number of parts.

  For example, as in the prior art disclosed in Patent Document 2, when a ball screw mechanism is used, the screw shaft and the motor output shaft are arranged in substantially the same straight line, and a long opening / closing stroke is ensured. It is difficult. That is, the length of the screw shaft must be shortened by an amount corresponding to the length of the motor and the coupling.

  Here, for example, it is also conceivable that a motor is disposed at the rear of the storage chamber and the motor output shaft and the screw shaft are connected substantially vertically using a bevel gear, a crown gear, or the like. Thereby, the length of a screw shaft can be lengthened and a long opening / closing stroke can be ensured. However, since the power transmission mechanism becomes complicated, assembly productivity is reduced and costs are increased.

  Further, when gears, ball screws, or the like are used, it is necessary to process these power transmitting parts with high accuracy. Therefore, there is a problem that it is difficult to reduce the component cost.

  In addition, in an open / close device using a gear, a ball screw, or the like, there is a problem that noise due to contact with a tooth surface or a rolling surface is large and power transmission efficiency is low.

  Furthermore, a refrigerator equipped with an opening / closing device that automatically opens and closes the door is required to be configured so that the door can be manually opened and closed in case of a power failure or the like, and safety measures against contact with the body are also required.

  The present invention has been made in view of the above circumstances, and an object thereof is to reduce the burden on the user by automatically opening and closing the door at high speed, high accuracy and low noise, and a compact opening and closing device. Therefore, it is to provide a refrigerator that can secure a large storage volume.

  Another object of the present invention is to provide a safe and convenient refrigerator capable of both automatic opening and closing and manual opening and closing and capable of stopping the door when contacting the body or the like. is there.

  The refrigerator of the present invention is a refrigerator having a drawer-type door, an opening / closing device that opens and closes the door, and a control device that controls the opening / closing device, and each of the opening / closing devices is provided rotatably. One or more pulleys, a wire that is installed on the pulley and that forms a straight portion extending at least partially along the direction of movement of the door, and is fixed to the straight portion and attaches and detaches the wire and the door A freely engaging clamp, both ends of the wire wound in opposite directions, a rotatable winding rotor fixed to each other, and a forward link connected to the winding rotor to rotate the winding rotor And a reversible motor.

  According to the refrigerator of the present invention, the opening / closing device can transmit the power of the motor to the door by the wire laid on the pulley. Thereby, the door of a refrigerator can be opened and closed automatically at high speed and with low noise, and the burden on the user when opening and closing the door can be reduced.

  In addition, since the opening / closing device of the present invention transmits the power for opening and closing the door by the wire, the layout design freedom of the power transmission mechanism is high. Therefore, it is possible to secure a large storage capacity of the refrigerator by arranging the opening / closing device compactly in the dead space of the refrigerator while ensuring a long automatic opening / closing stroke.

  Moreover, since the clamp which detachably engages a wire and a door is provided, a door can be removed easily. This facilitates cleaning and maintenance of the equipment. Further, since the door can be easily attached, productivity is also improved.

  Moreover, the both ends of a wire are wound around a winding rotor so that it may become a mutually reverse rotation direction, and each is fixed to a winding rotor. Thereby, when the winding rotor is rotated, the wire can be wound and delivered simultaneously. As a result, the power of the motor can be efficiently transmitted to the door, and the door can be opened and closed with high speed and high accuracy.

  Moreover, you may provide a pair of the linear part of the wire extended along the moving direction of a door, and the clamp fixed to this linear part on the right and left both sides of a door, respectively. As a result, the door can be pushed from both sides, and the opening / closing power can be transmitted with high efficiency while suppressing deformation and the like. As a result, the door can be opened and closed smoothly at high speed.

  In addition, a clutch that connects the motor and the winding rotor in an intermittent manner may be provided, and when the motor is not driven, the clutch and the winding rotor may be disconnected by disconnecting the clutch. This facilitates manual door opening and closing.

  Further, a position detection unit for detecting the position of the clamp may be provided, and the driving of the motor may be controlled based on the position information detected by the position detection unit. Thereby, the position of the door can be controlled with high accuracy. In addition, it is possible to increase the speed of opening and closing the door by high-precision position control.

  Further, power load detection means for detecting the power load of the motor may be provided, and the motor drive may be stopped by determining overload of the motor based on the power load information of the motor detected by the power load detection means. Thereby, when a door contacts a body etc., a door can be stopped safely.

  Moreover, you may provide the flame | frame comprised integrally and may attach components, such as a pulley, a winding rotor, and a motor. Thereby, since each component of the opening / closing device can be supported with high rigidity, it is possible to efficiently transmit the door opening / closing power by suppressing the displacement of each component and the slack of the wire resulting therefrom. As a result, the door can be opened and closed with high speed and high accuracy. Further, since the opening / closing device can be easily attached, the assembly productivity of the refrigerator is improved.

It is a front external view of the refrigerator which concerns on embodiment of this invention. It is a perspective view which shows the door of the lower freezer compartment of the refrigerator which concerns on embodiment of this invention. It is a partially broken perspective view which shows the lower stage freezer compartment inside the refrigerator which concerns on embodiment of this invention. It is a perspective view which shows the clamp vicinity of the refrigerator which concerns on embodiment of this invention (the B section detailed drawing of FIG. 3). It is a perspective view which shows the opening / closing apparatus of the refrigerator which concerns on embodiment of this invention. It is explanatory drawing which expand | deploys and shows the wire path | route of the refrigerator which concerns on embodiment of this invention. It is the top view which shows the state which disconnected the (A) clutch of the drive unit of the refrigerator which concerns on embodiment of this invention, the state which connected the (B) clutch, and (C) the movement of a winding rotor. It is a control block diagram regarding the door opening and closing control of the refrigerator according to the embodiment of the present invention. It is a graph which shows the door opening and closing speed of the refrigerator which concerns on embodiment of this invention. It is a graph which shows the motor load of the refrigerator which concerns on embodiment of this invention.

  Hereinafter, the refrigerator which concerns on embodiment of this invention is demonstrated in detail based on drawing.

  FIG. 1 is a front external view showing a schematic structure of the refrigerator 1 according to the present embodiment. As shown in FIG. 1, the refrigerator 1 includes a heat insulating box 2 as a main body, and forms a storage room for storing food and the like inside the heat insulating box 2. The interior of the storage room is divided into a plurality of storage rooms 3 to 7 according to storage temperature and usage. The uppermost stage is the refrigerator compartment 3, the lower left side is the ice making room 4, the right side is the upper freezer room 5, the lower stage is the lower stage freezer room 6, and the lowermost stage is the vegetable room 7.

  The front surface of the heat insulation box 2 is opened, and doors 8 to 12 are provided in the openings corresponding to the respective storage chambers 3 to 7 so as to be freely opened and closed. The door 8 closes the front surface of the refrigerator compartment 3, and the upper right lower portion of the door 8 is rotatably supported by the heat insulating box 2. Moreover, the doors 9-12 are drawer-type doors. The doors 9 to 10 are each supported by the heat insulating box 2 so as to be drawn out forward of the refrigerator 1.

  The heat insulating box 2 is filled and foamed in a steel plate outer box, a synthetic resin inner box disposed with a gap inside, and a gap between the outer box and the inner box. And an insulating material made of polyurethane foam. Each of the doors 8 to 12 also employs a heat insulating structure similar to that of the heat insulating box 2.

  Although not shown, the refrigerator 1 includes a vapor compression refrigeration cycle circuit that uses, for example, isobutane (R600a) or the like as a cooling means. And the air cooled with the cooler of the said refrigerating cycle circuit is forcedly circulated to each said storage chambers 3-7, and the food etc. stored there are cooled.

  FIG. 2 is a perspective view of the door 11 of the lower freezer compartment 6 as viewed from the right rear side of the refrigerator 1. As shown in FIG. 2, a storage container 13 for storing food or the like is detachably attached to the door 11. And the door 11 is comprised so that it can be pulled out from the heat insulation box 2 (refer FIG. 1) of the refrigerator 1, and can be removed from the heat insulation box 2 in the state which the storage container 13 combined integrally. ing.

  Specifically, a pair of left and right side frames 14 extending in the direction in which the door 11 is pulled out are attached to the inside (rear side) of the drawer-type door 11. The side frame 14 is formed by, for example, press-molding a steel plate, and has a function as a moving rail that supports the door 11 to the heat insulating box 2 of the refrigerator 1 so as to be freely drawn out. Further, the side frame 14 has a function of supporting the storage container 13 integrally with the door 11.

  A guide roller 16 is rotatably mounted near the end of the side frame 14 on the back side. The guide roller 16 is mounted on a fixed rail 17 (see FIG. 3), which will be described later, and guides the movement of the door 11 together with the side frame 14 to support the door 11 so as to be opened and closed.

  Further, the side frames 14 arranged on the left and right sides are connected to each other by the rear frame 15 in the vicinity of the end on the back side. The rear frame 15 is a strength member that increases the rigidity of the side frame 14, and is formed, for example, by bending a steel round bar or the like.

  FIG. 3 is a partially broken perspective view of the inside of the lower freezer compartment 6 as viewed from the left front side of the refrigerator 1 and shows a state in which the door 11 is pulled out. The fracture surface in FIG. 3 is a cross section along line AA shown in FIG. In addition, illustration of the storage container 13 (refer FIG. 2) is abbreviate | omitted in FIG.

  As shown in FIG. 3, a fixed rail 17 extending in the moving direction of the door 11, that is, the front-rear direction, is provided on the inner side surface of the lower freezer compartment 6. A guide roller 18 is provided at the front of the fixed rail 17.

  The above-described guide roller 16 (see FIG. 2) provided on the door 11 relatively moves along the fixed rail 17, and the guide roller 18 relatively moves along the side frame 14. Thereby, the movement of the door 11 is guided and the door 11 can be moved in the front-back direction of the refrigerator 1.

  A movable guide rail may be further interposed between the side frame 14 and the fixed rail 17.

  An opening / closing device 20 for opening and closing the door 11 is disposed inside the lower freezer compartment 6. The opening / closing device 20 includes a drive unit 21 as a drive source that opens and closes the door 11 and a wire 25 that transmits power from the drive unit 21.

  A part of the wire 25 forms a straight portion 25a extending along the moving direction of the door 11, and a clamp 26 for detachably engaging the wire 25 and the door 11 is fixed to the straight portion 25a. ing.

  By winding and feeding the wire 25 by the winding rotor 23 of the drive unit 21, the wire 25 moves in the axial direction, and the clamp 26 fixed to the linear portion 25 a moves together with the wire 25 in the front-rear direction of the refrigerator 1. To do. Thereby, the door 11 connected to the clamp 26 can be opened and closed.

  The opening / closing device 20 has a position sensor 54 as position detection means for detecting the position of the clamp 26. The position sensors 54 are provided at a plurality of locations along the moving direction of the clamp 26 inside the frame 40 of the opening / closing device 20.

  FIG. 4 is a perspective view showing the vicinity of the clamp 26 of the refrigerator 1 and shows details of a portion B in FIG. 3. As shown in FIG. 4, the clamp 26 includes a clamp base 45, an engagement piece 46, and a spring 47.

  The clamp base 45 is fixed to the straight portion 25a of the wire 25 and supported by a guide rail 48 extending along the moving direction of the door 11 so as to be linearly movable. The guide rail 48 is, for example, a linear guide using needle rollers (rollers). Thereby, the clamp base 45 moves in the front-rear direction of the refrigerator 1 in accordance with the movement of the wire 25.

  The engagement piece 46 is a member that detachably engages the rear frame 15 of the door 11. An engaging portion 46a, which is a substantially U-shaped notch that opens upward, is formed on the upper portion of the engaging piece 46, and the rear frame 15 engages with the engaging portion 46a.

  The engagement piece 46 is attached to the clamp base 45 and supported so as to be movable in the vertical direction. The engaging piece 46 is biased upward by a spring 47 from below, and is normally positioned at the upper limit of the moving range. That is, the engaging piece 46 is provided so as to move downward when pressed from above and to return to a predetermined position (upper limit position) when released.

  Thus, by providing the engagement piece 46 of the clamp 26 to be movable in the vertical direction, the door 11 can be easily attached and detached. That is, when the door 11 is attached or removed, when the rear frame 15 comes into contact with the upper portion of the engagement piece 46, the engagement piece 46 moves downward, so that the rear frame 15 passes (enters and exits the engagement portion 46a). Is acceptable.

  As described above, by adopting a configuration in which the door 11 can be easily attached and detached, it becomes possible to easily perform a cleaning operation and a maintenance operation of the device. Moreover, since the door 11 can be attached easily, productivity is also improved.

  FIG. 5 is a perspective view of the opening / closing device 20 as viewed from the left front surface of the refrigerator 1. As shown in FIG. 5, the opening / closing device 20 is integrally assembled with a frame 40 having a substantially U-shape when viewed from above.

  The frame 40 is formed by, for example, bending a steel plate, and has a substantially U-shaped cross section and extends in the left-right direction of the refrigerator 1 along the back surface of the lower freezer compartment 6 (see FIG. 3). It has a pair of left and right side portions 40a that are formed continuously from the left and right ends of the back surface portion 40b and extend in the front-rear direction of the refrigerator 1 with a substantially U-shaped cross section.

  A plurality of pulleys 30 to 39 are rotatably attached to the frame 40 at predetermined positions. Then, the pulleys 30 to 39 are provided with the wire 25, and as described above, the wire 25 forms a straight portion 25a extending along the moving direction of the door 11 (see FIG. 3). A pair of the linear portion 25 a and the clamps 26 fixed thereto are formed on the left and right sides along the side surface portion 40 a of the frame 40.

  In this way, by providing a pair of linear portions 25a and clamps 26 on the left and right sides of the refrigerator 1, the door 11 is pushed from both sides, and the opening and closing power is transmitted with high efficiency while suppressing the deformation and inclination of the door 11. Can do. As a result, the door can be opened and closed smoothly at high speed.

  A drive unit 21 is disposed on the back surface portion 40 b of the frame 40 as a drive source for opening and closing the door 11. In the present embodiment, since the wire 25 is used as the power transmission mechanism, the layout design freedom of the drive component and the power transmission component is high. Therefore, as shown in FIG. 5 (and FIG. 3), the drive unit 21 can be disposed in the dead space at the lower back of the lower freezing chamber 6. Thereby, a large storage capacity of the refrigerator 1 can be ensured while ensuring a long automatic opening / closing stroke.

  In addition, as described above, the opening and closing device 20 is assembled to the refrigerator 1 by attaching the components such as the drive unit 21 and the pulleys 30 to 39 to the integrally formed frame 40 and integrally configuring the opening and closing device 20. Work can be performed easily and productivity is improved.

  Further, by fixing each component such as pulleys 30 to 39 constituting the power transmission mechanism of the opening / closing device 20 to the steel frame 40, each component is supported with high rigidity, and each component by the tension of the wire 25 is supported. Displacement can be suppressed. Thereby, the slack of the wire 25 at the time of opening and closing the door 11 is reduced, the tension is stabilized, and the power can be transmitted efficiently. As a result, the door 11 can be opened and closed with high speed and high accuracy.

  FIG. 6 is an explanatory view showing the path of the wire 25 in an expanded manner. As shown in FIG. 6, the opening / closing device 20 constitutes a power transmission mechanism by installing one wire 25 on pulleys 30 to 39.

  As the wire 25, for example, a stainless steel wire or the like can be used. Further, the stainless steel wire 25 may be impregnated with a lubricant or the like, and the outer periphery thereof may be coated with a synthetic resin material. This enables clean and highly efficient power transmission with low noise, low friction, and less generation of wear powder.

  The vicinity of one end portion 25 c of the wire 25 is wound around the winding rotor 23, and the end portion 25 c is fixed to the winding rotor 23. The wires 25 are sequentially installed on the pulleys 30 to 39, and a straight portion 25 a is formed between the left pulley 31 and the pulley 32 and between the right pulley 36 and the pulley 37.

  The vicinity of the other end portion 25 d of the wire 25 is wound around the winding rotor 23, and the end portion 25 d is fixed to the winding rotor 23. Here, the vicinity of one end portion 25c and the vicinity of the other end portion 25d are wound around the winding rotor 23 so as to be in opposite directions of rotation. Thereby, winding by the side of the one end part 25c of the wire 25 and sending out by the side of the other end part 25d can be performed simultaneously, or respectively in the opposite direction. Thereby, the tension | tensile_strength of the wire 25 is stabilized, slack etc. are suppressed and a door can be opened and closed at high speed.

  Specifically, the winding rotor is rotated by the motor 22 in a predetermined rotation direction, and as shown by an arrow in FIG. 6, the feeding on the one end 25 c side of the wire 25, the winding on the other end 25 d side, At the same time. Thereby, the pair of left and right linear portions 25a and the clamps 26 fixed thereto move in the front direction of the refrigerator 1, and the door 11 (see FIG. 3) connected to the clamps 26 can be opened. Further, by rotating the motor 22 in the reverse direction, the wire 25 and the clamp 26 can move in the direction opposite to the arrow in FIG. 6 to close the door 11.

  Here, the wires 25 laid between the left pulleys 30, 31, 32 and between the right pulleys 35, 36, 37 are arranged in the lower stage, between the left pulleys 32, 33, 34 and the right side. The wire 25 constructed between the pulleys 37, 38, 39 is disposed in the upper stage.

  Specifically, the pulleys 30, 31, 33, 34, 35, 36, 38, 39 provided on the back side have a substantially vertical rotation axis and turn the wire 25 in a substantially horizontal direction. The pulleys 30, 31, 35, and 36 are disposed in the lower stage, and the pulleys 33, 34, 38, and 39 are disposed in the upper stage. And the pulleys 32 and 37 are provided in the front part of the switchgear 20, have a substantially horizontal rotating shaft, and turn the wire 25 from the upper stage to the lower stage or vice versa by about 180 degrees (see FIG. 4).

  Thus, by laying the wire 25 on the upper and lower stages, the width (left and right and front and rear) occupied by the power transmission mechanism of the switchgear 20 can be reduced. Thereby, the storage volume of the refrigerator 1 can be enlarged.

  More preferably, the upper and lower wires 25 are constructed so as to overlap in a top view. Further, the lower left pulley 30 and upper pulley 34 of the winding rotor 23, the lower left pulley 31 and upper pulley 33, the lower right pulley 35 of the winding rotor 23, the upper pulley 39, and the right end. The lower pulley 36 and the upper pulley 38 are arranged so as to overlap each other when viewed from above (see FIG. 5). Thereby, a large storage capacity can be secured.

  Furthermore, the pulleys that overlap in the above-described top view are each pivotally supported by the same shaft and bearing. Thereby, the number of parts can be reduced and productivity can be improved.

  Further, the substantially central portion 25 b of the wire 25 is wound around the winding rotor 23 a predetermined number of times between the pulley 34 and the pulley 35. As a result, sagging of the wire 25 is suppressed, the tension is stabilized, and high-speed and highly efficient power transmission becomes possible.

  FIGS. 7A to 7C are top views showing the drive unit 21 of the opening / closing device 20. 7A shows a state in which the clutch 24 is disengaged, FIG. 7B shows a state in which the clutch 24 is connected, and FIG. 7C shows movement of the winding rotor 23.

  As shown in FIG. 7A, the drive unit 21 includes a motor 22, a winding rotor 23 connected to the motor 22, and a clutch 24 that connects the motor 22 and the winding rotor 23 in an intermittent manner. Have.

  The motor 22 serves as a drive source for opening and closing the door 11 (see FIG. 3), and can freely rotate forward and backward. The motor 22 is fixed to the back surface portion 40 b of the frame 40 by a support member 41.

  The winding rotor 23 is driven and rotated by the motor 22 to simultaneously wind and feed the wire 25. The winding rotor 23 is rotatably supported by a shaft 28 that is pivotally supported by the support member 42 and a shaft 44 that is fixed to the support member 43. The support member 42 and the support member 43 are fixed to the back surface portion 40 b of the frame 40.

  The clutch 24 includes a driving body 24 a connected to the output shaft of the motor 22 and a driven body 24 b provided on the shaft 28 connected to the winding rotor 23. The clutch 24 is a so-called meshing positive clutch, and the driving body 24a and the driven body 24b have fitting shapes corresponding to each other. Thereby, power can be transmitted with high efficiency. As the clutch 24, other types of clutches such as a friction clutch can be employed.

  The clutch 24 is engaged / disengaged using the solenoid 27 as a drive source. That is, the solenoid 27 is energized to move the movable body 60 and the driven body 24b of the clutch 24 is moved in the rotational axis direction by the pressing roller 61 provided on the movable body 60 as shown in FIG. . Thereby, the drive body 24a and the driven body 24b are meshed, and the motor 22 and the winding rotor 23 are connected.

  In addition, the movable body 60 is urged by a spring 62 in the direction of disengaging the clutch 24. Thus, in a state where the solenoid 27 is not energized, as shown in FIG. 7A, the driving body 24a and the driven body 24b are disengaged, and the motor 22 and the take-up rotor 23 are separated from each other. Become.

  In this embodiment, when the motor 22 is not driven, the clutch 24 is disconnected and the motor 22 and the winding rotor 23 are separated. Thereby, the door 11 can be easily opened and closed manually. In particular, the clutch 24 is configured to be connected while the solenoid 27 is energized, and the clutch 24 is disconnected by the spring 62 when not energized. Therefore, the door 11 can be easily opened and closed even during a power failure.

  The take-up rotor 23 and the shaft 28 that drives the take-up rotor 23 are constrained in the rotational direction by, for example, splines, but are movably fitted in the axial direction. The winding rotor 23 and the other shaft 44 that supports the winding rotor 23 are formed with screw threads (valleys) having a predetermined pitch on the mating surfaces of the winding rotor 23 and the other shaft 44.

  With such a configuration, when the winding rotor 23 is rotated, the winding rotor 23 moves in the direction of the rotation axis as shown in FIG. 7C. As a result, the wire 25 can be wound while being aligned with the outer periphery of the take-up rotor 23, so that the tension of the wire 25 can be stabilized and the wire 25 can be wound and fed out at high speed and smoothly.

  FIG. 8 is a control block diagram regarding door opening / closing control of the refrigerator 1. As illustrated in FIG. 8, the refrigerator 1 includes a control device 50 that controls opening and closing of the door 11 (see FIG. 3). A switch 51, a position sensor 54, a motor 22 and a solenoid 27 are connected to the control device 50.

  The switch 51 is instruction input means for inputting a door opening / closing instruction by the user, and is provided, for example, on the front surface of the door 11. As the switch 51, for example, a push button, a touch panel, or the like can be used.

  When the user operates the switch 51 to instruct opening / closing of the door 11, the control device 50 drives the motor 22 to energize the solenoid 27. Thereby, the motor 22 rotates, the clutch 24 (refer FIG. 7) is connected, and the door 11 is opened and closed.

  In place of or in addition to the switch 51, a microphone 52 as voice input means for inputting the user's voice or the like may be provided. Thereby, the door 11 can be opened and closed by a voice instruction from the user. By providing such a function, the user can open and close the door 11 even when it is difficult to operate by hand, for example, because the user has a baggage in both hands.

  Furthermore, a camera 53 as a video input unit may be provided instead of or in addition to the switch 51 and the microphone 52. Then, the video information input from the camera 53 can be analyzed by the control device 50, and the door 11 can be opened and closed based on predetermined video analysis information. For example, when the user performs a predetermined operation, the door 11 can be opened and closed by recognizing the operation. This further improves convenience.

  Further, a remote controller or the like (not shown) may be used as the instruction input means. The instruction input means is not limited to these, and various other interfaces can be used.

  The position sensor 54 is position detection means for detecting the position of the door 11. The control device 50 controls the driving of the motor 22 based on the position information of the door 11 detected by the position sensor 54. Specifically, the control device 50 executes a calculation for obtaining the moving speed of the door 11 based on the position information detected by the position sensor 54, and determines the start / stop timing of the motor 22, the rotation speed, and the like. .

  In addition, the control device 50 includes a load sensor 55 as a power load detection unit that detects a power load of the motor 22. Specifically, the load sensor 55 detects the voltage and current of the motor 22. Then, the control device 50 determines the overload of the motor 22 based on the power load information of the motor 22 detected by the load sensor 55 and stops driving the motor 22.

  Next, speed control of the door 11 by the control device 50 will be described with reference to FIGS. 8 and 9. FIG. 9 is a graph showing changes in the speed of the door 11 when the door 11 is opened and closed. The control device 50 starts the motor 22 at a low rotational speed, energizes the solenoid 27, and connects the clutch 24 (see FIG. 7) (control timing T1).

  Here, the control apparatus 50 rotates the motor 22 slowly immediately after starting. Thereby, the meshing of the clutch 24 can be ensured and the idling of the motor 22 due to the meshing failure can be prevented.

  When the clutch 24 is engaged and the door 11 starts to move, the control device 50 increases the rotation speed of the motor 22. That is, the door 11 is accelerated and its moving speed gradually increases. Thus, by suppressing the speed immediately after the start of movement and gradually accelerating, the impact at the time of activation can be reduced. When the moving speed of the door 11 reaches a predetermined speed Vc at a constant speed (control timing T2), the control device 50 stops the acceleration of the motor 22 and rotates the motor 22 at a constant speed.

  And before stopping the door 11, the control apparatus 50 starts the deceleration control which decelerates the rotational speed of the motor 22 and decelerates the door 11 by predetermined | prescribed control timing T3. Thus, by stopping the door 11 after gradually decelerating, the impact when the door 11 stops can be kept low. Then, the control device 50 stops the motor 22 and disconnects the clutch 24 at a predetermined control timing T4.

  Control timing T2 for switching from the aforementioned acceleration control to constant speed rotation, control timing T3 for starting deceleration control from constant speed rotation, and control timing T4 for stopping door 11 are each started (control timing T1 by control device T1). It may be determined by calculating the elapsed time from). Thus, by using the calculation by the control device 50, the number of position sensors 54 can be reduced and the productivity can be increased.

  The detection timing by the position sensor 54 at a predetermined position may be used as the control timings T2, T3, and T4 as they are. Thereby, the opening and closing of the door 11 can be controlled with high accuracy without requiring complicated calculation by the control device 50.

  Furthermore, the control timings T2, T3, and T4 may be determined by combining the detection timing from the position sensor 54 at a predetermined position and the calculation by the control device 50. Thereby, highly accurate position control becomes possible.

  For example, the control timings T2, T3, and T4 may be determined by calculating an elapsed time after passing through the position sensor 54 at a predetermined position. Furthermore, the acceleration, deceleration, and stop of the door 11 may be controlled by calculating the moving speed and moving distance of the door 11 by the control device 50 based on position information from a plurality of position sensors 54 provided.

  Next, with reference to FIG.8 and FIG.10, the control by the control apparatus 50 when the door 11 contacts a body etc. is demonstrated. FIG. 10 is a graph showing the power load of the motor 22.

  When the door 11 comes into contact with the body or the like, the resistance for moving the door 11 increases, and the power load of the motor 22 increases as shown in FIG. 10 (control timing Tx). When the control device 50 determines that the motor 22 is overloaded based on the power load of the motor 22 detected by the load sensor 55, the control device 50 stops driving the motor 22.

  Specifically, the control device 50 starts the motor 22 (control timing T1), gradually accelerates, and then switches to constant speed rotation (control timing T2). The control device 50 determines that the motor 22 is overloaded when the power load of the motor 22 increases beyond a predetermined threshold dP (control timing Tx) with reference to the average power load Pc of the motor 22 during constant speed rotation. Judge that there is. As described above, the control device 50 stops the rotation of the motor 22 and disconnects the clutch 24.

  Thus, since the overload of the motor 22 is determined based on the average power load Pc of the motor 22 when the door 11 is moved at a constant speed, the amount of food or the like stored in the storage container 13 (see FIG. 2) can be reduced. Even if the number is increased or decreased, the overload of the motor 22 can be accurately determined.

  The average power load Pc during the constant speed movement is calculated by the control device 50 using the position information and elapsed time detected by the position sensor 54 in addition to the power load information of the motor 22 detected by the load sensor 55. can do.

  In place of or in addition to the method of determining by the increment (threshold value dP) with respect to the average power load Pc as described above, the motor 22 may be stopped when a predetermined allowable power load value (absolute value) is exceeded. good. By adding such control, it is possible to further enhance the safety when the door 11 comes into contact without requiring complicated calculation by the control device 50.

  Further, when an overload of the motor 22 is detected (control timing Tx), instead of immediately stopping the motor 22 and disengaging the clutch 24, the motor 22 is reversely rotated and then stopped to disengage the clutch 24. It's also good. Thereby, the door 11 can be returned to a reverse direction and it can keep away from the body etc. which contacted. As a result, for example, when the body or the like is sandwiched, damage to the body or the like can be reduced.

  As mentioned above, although embodiment of this invention was described taking the refrigerator 1 provided with the opening / closing apparatus 20 which opens and closes the door 11 of the lower freezer compartment 6 as an example, this invention is not limited to this. For example, an opening / closing device equivalent to the opening / closing device 20 can be provided in the ice making room 4, the upper freezing room 5, the vegetable room 7, and the like, and the drawer-type doors 9, 10, 12 can be automatically opened and closed. Further, it is of course possible to use it for a drawer type door not illustrated here.

  In the present embodiment, the opening / closing device 20 has a pair of left and right linear portions 25 a and a clamp 26, and the configuration thereof is described as pressing the left and right sides of the door 11. However, the position and the number of forming the straight portions 25a and the like are not limited to this.

  For example, when opening and closing a small door, only one straight portion 25a or the like may be formed. Thereby, the opening / closing device 20 can be made more compact. Further, the portion that forms the straight portion 25a and the like and pushes the door may be substantially at the center of the bottom of the door.

  Further, three or more straight portions 25a and the like may be provided. Thereby, even when the door having a large storage container is opened and closed, the door can be stably opened and closed. In addition, various modifications can be made without departing from the scope of the present invention.

DESCRIPTION OF SYMBOLS 1 Refrigerator 2 Heat insulation box 3 Refrigeration room 4 Ice making room 5 Upper freezing room 6 Lower freezing room 7 Vegetable room 8-12 Door 13 Storage container 14 Side frame 15 Rear frame 20 Opening / closing device 21 Drive unit 22 Motor 23 Winding rotor 24 Clutch 25 Wire 25a Linear portion 25c End portion 25d End portion 26 Clamp 27 Solenoid 30-39 Pulley 40 Frame 50 Control device 51 Switch 54 Position sensor 55 Load sensor

Claims (6)

A refrigerator having a drawer-type door, an opening and closing device that opens and closes the door, and a control device that controls the opening and closing device,
The opening / closing device includes at least one or more pulleys that are rotatably provided, a wire that is provided on the pulley and that forms a linear portion extending at least partially along the moving direction of the door, and the linear portion A clamp that is fixed to the wire and detachably engages the wire and the door, a rotatable winding rotor in which both ends of the wire are wound in opposite directions and fixed, and the winding rotor And a reversible motor that is connected to the motor and rotates the winding rotor.   The refrigerator according to claim 1, wherein a pair of the straight part and the clamp fixed to the straight part are provided on each of the left and right sides of the door. The opening / closing device includes a clutch that connects the motor and the winding rotor in an intermittent manner,
The refrigerator according to claim 1 or 2, wherein when the motor is not driven, the control device disconnects the motor and the winding rotor by disconnecting the clutch. The opening / closing device includes position detecting means for detecting a position of the clamp;
The refrigerator according to any one of claims 1 to 3, wherein the control device controls driving of the motor based on position information of the clamp detected by the position detection unit.   The control device includes power load detection means for detecting a power load of the motor, and determines an overload of the motor based on power load information of the motor detected by the power load detection means. The refrigerator according to any one of claims 1 to 4, wherein driving is stopped.   The said opening / closing apparatus has a frame which is comprised integrally and supports the said pulley, the said winding rotor, and the said motor, respectively, The Claim 1 thru | or 5 characterized by the above-mentioned. Refrigerator.

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