CN1648560A - Refrigerator - Google Patents

Abstract

This refrigerator comprises the door opening device 30 for opening the door by pressing a door face by projecting out a pressing member 37 when a driving source is energized, door opening switches 27a, 27b outputting a door opening signal and a door closing signal by detecting opening and closing states of the doors 20a, 20b, and a control means 50 for opening the door by energizing the door opening device 30 when driving signals are output from the door opening switches 27a, 27b under a condition that the door closing signals are output from the door switches 26a, 26b. The control means 50 cuts off the energization to the door opening device 30 after the lapse of a specific time from the output of the door opening signals from the door switches 26a, 26b.

Description

refrigerator

technical field

The present invention relates to a refrigerator provided with a door opening device for opening a storage compartment door by protruding out of a pressing member.

Background technique

In recent years, refrigerators tend to diversify their eating habits and increase their storage capacity. Especially in domestic refrigerators, the storage capacity of more than 400 liters has become the mainstream, and there is a tendency for the height and width of the refrigerator body to increase. .

As a result, the doors of refrigerators, freezers, and vegetable rooms have also increased in size. Especially, the storage bags on the inside of the doors of refrigerators with large storage volumes have increased in height and width, and have also increased in depth, which may accommodate a lot of food. Tendency, the door itself is often large and requires a large force to open the door, and there is a problem that the burden on women or elderly people who are weak in strength increases.

As a structure to solve the above-mentioned problems, in recent years, a refrigerator with an electromagnet door opening device that uses the user's manual switch operation to extend the ejector pin from the body side to push the door and open the door has been supplied to the market. Products that do not require a burden were opened and evaluated (for example, Patent Document 1).

As this kind of door opening device, when the door opening switch provided on the front of the door is operated, the electromagnet is energized for a predetermined time, and the push member is pushed forward from the initial position to push the door open, and after the predetermined time, the door is pushed open. The energization is turned off to be pulled in by the urging force of the pull-in spring, and returns to the initial position by the spring force.

In addition, in a side-by-side refrigerator, a single door opening device is used to simultaneously open the left and right doors or to open only one side of the left and right doors (for example, Patent Document 2).

[Patent Document 1] Japanese Patent Laid-Open No. 2001-59675

[Patent Document 2] Japanese Patent Laid-Open No. 2003-83673

However, in the structure of the door opening device of the above-mentioned Patent Document 1, since the preset voltage is supplied to the electromagnet within a predetermined time, when the closing time of the door, the loading capacity of the storage bag, etc. When the force required to open the door is changed, the door cannot be fully opened because the opening of the door is too weak, or the food placed in the storage bag falls due to too strong force.

Also, the force required to open the door changes according to the specifications of the refrigerator, such as the loading capacity of the storage bag in the door and the cooling in the refrigerator, and in the door opening devices of the above-mentioned patent documents 1 and 2, due It is a structure that supplies a preset voltage to the electromagnet for a predetermined time, so the door may not be fully opened due to too weak opening, or the food placed in the storage bag may fall due to too strong opening. bad situation.

In addition, in side-by-side refrigerators, the force required to open the door is changed only when opening only one side and using a rotating partition plate, and no study has been made on the driving method of the door opener. .

In addition, in a refrigerator with side-by-side doors, when the left and right doors can be opened only on one side, usually only one door opening switch is operated, and when the user energizes one door opening device, it is often also activated at the same time. Operate the other party's door opener.

In this case, the commercial power supply of electrical products used in kitchens such as refrigerators, electric ovens, and rice cookers is generally shared because the automatic circuit breaker that prevents excessive current from flowing is made common. This automatic circuit breaker may operate when power is applied to both door openers.

Such verification has not been carried out in the past, but it is also assumed that the other side's door opening switch is operated or operated simultaneously during the power supply to one door opening device according to the user's actual situation, and it is necessary to check the door opening device. The behavior of the device is studied.

Contents of the invention

The present invention was made in consideration of the above-mentioned problems, and an object of the present invention is to provide a refrigerator which can automatically open the door optimally even when a storage bag in the refrigerator door is under load or the like.

Another object of the present invention is to provide a refrigerator that can automatically open the door optimally regardless of the usage status of the refrigerator.

Yet another object of the present invention is to provide a method that does not cause a flow when the other door opening switch is operated when power is supplied to one door opening device in a refrigerator with side-by-side doors, or when the other door opening switch is operated at the same time. Refrigerators that can reliably open the door due to excessive current.

The refrigerator of the present invention is characterized in that it includes: a door freely openable and closable provided on the front opening of the storage room of the main body; and a door opening device for extending the pushing member to push the door surface and open the door when the drive source is energized. ; The door open switch that drives the drive signal of the door opener by the user's operation output; the door switch that detects the door open state of the door and outputs the door open signal and the door close signal, in the state of outputting the door close signal from the door switch Next, energization to the door opening device is started when a drive signal is output from the door open switch, and energization is continued until a predetermined time elapses after the door open signal is output by the door switch.

The refrigerator of the present invention is characterized in that it has: two-fold left and right doors which are freely openable and closable provided on the front opening of the storage room of the main body; The device and the right door opening device; the left door switch and the right door switch that respectively energize the left and right door opening devices by the user's operation output driving signal; the load detection means for detecting the load applied when the left and right doors are opened. When both or any one of the doors is opened, the door is opened by reducing the opening force of the left and right door openers when it is determined by the load detection means that the load at the time of door opening is light.

The refrigerator of the present invention is characterized in that it has: two-fold left and right doors which are freely openable and closable provided on the front opening of the storage room of the main body; device and right door opening device; the left door switch and the right door switch that respectively energize the left and right door opening devices by the user's operation output drive signal, and operate the other door opening switch during the period when one door opening device is energized In this case, after the energization of the door opener is completed, the energization of the other door opener is started.

According to the above invention, according to the load state of the refrigerator door, when the magnetic washer which greatly changes the force required to open the door is pulled away, specifically, when the door open signal is output by the door switch, the door opener can be energized. Also, after opening the door without greatly changing the force required to open the door, the door can be opened optimally by turning off the power supply to the door opener after energizing for a predetermined time.

According to the above invention, the load when opening the door is detected according to the usage status of the refrigerator, and since the opening force of the door opening device can be appropriately changed, the door can be opened most appropriately.

Adopt above-mentioned invention, in the refrigerator of side-by-side door, can provide the occasion that does not flow too much even when the other side's door opening switch is operated when energizing to one door opening device, or the occasion of simultaneously operating. A refrigerator whose door can be reliably opened by an electric current.

Description of drawings

Fig. 1 is a time chart showing the operation of the door opener of the present invention.

Fig. 2 is a time chart showing the operation of the left and right door opening mechanism of the present invention.

Fig. 3 is a time chart showing the operation of the door opener in the case where the measurement time of the present invention is short.

Fig. 4 is a time chart showing the operation of the door opener in the case where the measurement time of the present invention is long.

Fig. 5 is a perspective view showing the refrigerator of the present invention.

Fig. 6 is a perspective view showing a door-open state of the refrigerator of Fig. 5 .

Fig. 7 is a plan view showing the refrigerator when the left door is opened.

Fig. 8 is a plan view showing the refrigerator when the right door is opened.

Fig. 9 is a plan view showing the refrigerator when the left door is opened while the right door is opened.

Fig. 10 is a control block diagram of the present invention.

Fig. 11 is a longitudinal sectional view showing the door opening device of the present invention.

Fig. 12 is a flow chart showing the operation of the door opening device of the present invention.

Fig. 13 is a perspective view showing the refrigerator of the present invention.

Fig. 14 is a perspective view showing a state in which the door of the refrigerator of Fig. 13 is opened.

Fig. 15 is a plan view showing the refrigerator when the left door is opened while the right door is opened.

Fig. 16 is a control block diagram of the present invention.

Fig. 17 is a flow chart showing the operation of the door opening device of the present invention.

Detailed ways

Embodiments of the present invention will be described below. Fig. 5 is a perspective view showing a refrigerator according to the present invention, and Fig. 6 is a diagram showing a door-open state of the refrigerator in Fig. 5 . In this Fig. 5, Fig. 6, in the refrigerator body 1 that is constituted by the insulated box of known structure, according to the order from top to bottom, be provided with refrigerating room 2, vegetable room 3, ice making room 4, can pair more The switch chamber 5 and the freezer chamber 6 for switching the internal temperature of the layers, and the ice making chamber 4 and the switch chamber 5 are arranged side by side.

In the front opening of the above-mentioned refrigerating room 2, there are left and right doors 20a and 20b, which are pivotally supported at the left and right ends respectively, so-called side-by-side doors. On the front surfaces of the freezer compartments 6, pull-out doors 3a, 4a, 5a, and 6a for connecting storage containers (not shown) are respectively provided. Magnetic gaskets 21a, 21b are mounted on the peripheral edge portions of the back side of the left and right doors 20a, 20b, and the left and right doors 20a, 20b are held closed by the magnetic gaskets 21a, 21b being attracted to the flange portion 1a of the refrigerator body 1. Structure. In addition, although not shown in figure, the magnetic gasket is also attached to the peripheral edge part of the back side of other doors 3a, 4a, 5a, and 6a.

A pair of ribs 22a, 22b extending up and down are respectively formed inside the magnetic washers 21a, 21b, and storage bags 23a, 23b for storing food are provided on the ribs 22a, 22b. Also, on the rib portion 22a of the left door 20a facing the right door 20b, there is provided a rotating partition plate 25 that attracts the magnetic washers 21a, 21b of the left and right doors in the closed state and closes the gap between the doors. The rotary partition plate 25 is rotated by sliding the pin 1b provided on the upper part of the main body in the groove formed on the upper surface of the rotary partition plate 25 in accordance with the opening and closing operation of the left door 20 .

At the front portion of left and right doors 20a, 20b, a left door opening switch 27a and a right door opening switch 27b are installed, when pushing the left door opening switch 27a, the output will open the door signal of the left door 20a, when pushing the right door opening switch 27b, A door opening signal for opening the right door 20b is output. In addition, when the left door opening switch 27a is pushed, a door opening signal for opening the right door 20b may be output.

Specifically, it is a structure in which a mechanical switch such as a normally open microswitch that is turned ON when the left and right door opening switches 27a, 27b are pushed and operated is incorporated. In addition, an optical switch or a magnetic switch using a photoelectric interrupter can also be configured.

As shown in the plan view of the refrigerator 1 when the left door 20a is opened in FIG. . The door switch 26a, 26b, when the button 26' is pushed by the rib part 22a, 22b, it is regarded as the door 20a, 20b is closed and outputs a door closing signal (OFF state), when the door 20a, 20b is opened, When the push button is gradually released and the button protrudes to a certain extent by its spring force, the doors 20a and 20b are regarded as opened and a door open signal is output (ON state).

On the top board part of refrigerator body 1, the door opener 30 that makes the left door 20a of refrigerating room 2 and the right door 20b be opened independently is installed, and this door opener 30 is provided with left door opening mechanism part 31 and right door opening mechanism Section 32.

Hereinafter, the left door opening mechanism unit 31 will be described. As shown in the cross-sectional structure of the upper part of the refrigerator 1 in Figure 11, the left door opening mechanism part 31 is a device that is half-buried in the recessed part 1c formed in the top plate part of the refrigerator body 1, and is made of synthetic resin. Inside the case 33 is a form in which an electromagnet 34 that is DC-driven as a drive source is accommodated.

This electromagnet 34 has the following main structural elements: a coil unit 35 formed by resin molding a cylindrical coil; A rod core 36; a pressing member 37 made of a non-magnetic metal fixed coaxially with respect to the plunger core 36, when the coil of the coil unit 35 is energized (hereinafter referred to as an energized state) The structure in which the type iron core 36 and the pressing member 37 bias toward the door 20a.

At the rear of the plunger 36, there is provided a flange portion 36a made of, for example, a C-shaped ring for preventing falling out, and a pull-in spring 38 made of a coil spring is provided around the plunger 36, An elongation force is caused to act between the flange portion 36 a and the coil unit 35 .

With the above-mentioned structure, when the electromagnet 34 is energized, the push member 37 is stretched out forward to push the left door 20a to automatically open the door. The elastic force of the spring 38 returns to the initial position.

Right door opening mechanism part 32, owing to be the same structure as left door opening mechanism part 31, so omit its explanation, but when the electromagnet 34 of right door opening mechanism part 32 is energized, become the state that makes right door 20b carry out door opening automatically .

And, as shown in Figure 7, the right door opening mechanism part 32 is arranged on the hinge side more than the left door opening mechanism part 31. The force is larger than the force required for the right door 20b, and the opening speed of the left and right doors 20a, 20b can be made substantially uniform by reducing the pressing force of the right door opening mechanism part 32.

In addition, when the right door opening mechanism part 32 and the left door opening mechanism part 31 are arranged symmetrically, the pressing force can be changed by using the energization time and supply voltage. By making the pushing force of the left door opening mechanism part 31 larger than that of the right side, It is also possible to make the opening speeds of the left and right doors 20a, 20b substantially uniform. Also, when the sizes of the left and right doors 20a and 20b are different, it is preferable to appropriately change the appropriate placement and pressing force.

Next, the control circuit of the present invention will be described with reference to the control block diagram of FIG. 10 .

The control device 50 inputs a door opening signal or a door closing signal from the left door switch 26a and the right door switch 26b according to the door opening states of the left and right doors 20a, 20b, and inputs a drive signal from the left door opening switch 27a and the right door opening switch 27b.

The control device 50 outputs an ON signal to the left door opening circuit 51 or the right door opening circuit 52 when a door closing signal is input based on these signals, and when a driving signal is input.

Now, the left door opening circuit 51 will be described. One terminal of the electromagnet 34 is connected to a positive output terminal of a voltage doubler rectifier circuit not shown, and the other terminal is connected to the drain side of the driving FET 61 . Furthermore, diodes 62 are connected in parallel to both terminals of the electromagnet 34 .

The FET61 is turned ON by a command from the control device 50 when the drive signal of the left door open switch 27a in the door closing signal is input to the control device 50 (the control power supply is, for example, DC 15V, and the drive power supply is, for example, DC 200V).

A specific configuration for driving the FET61 ON and OFF will be described. The terminal on the output side from the control device 50 is connected to the base side of the npn-type first transistor 71, and the collector side of the first transistor 71 is connected to the collector side of the pnp-type second transistor 67 through a resistor 69 to supply The power supply is controlled, and the emitter side is connected to the base sides of the second transistor 67 and the third transistor 68 , and is connected to the ground through a resistor 70 .

The emitter side of the second transistor 67 is connected to the emitter side of the pnp-type third transistor 68 , and is connected to the source side of the FET 61 through a resistor 64 . Also, the collector side of the third transistor 68 is connected to the ground.

In addition, the resistor 64 is connected in parallel to a circuit in which a resistor 66 and a diode 65 are connected in series, and is connected to the ground through a resistor 63 between the resistor 64 and the gate of the FET 61 .

In the case of the above configuration, when an ON signal is input from the control device 50, the first transistor 71 is turned ON. Then, since the control voltage is supplied to the collector side of the second transistor 67, the second transistor 67 is turned ON, and a current flows between the collector and the emitter. And, since the current to the base side of the third transistor 68 is cut off, the third transistor 68 is turned off and the FET 61 is turned on. On the other hand, when the ON signal from the control device 50 is cut off, the first transistor 71 is turned OFF, and the base current of the third transistor 68 flows through the resistor 70 that is grounded by utilizing the gate residual charge of the FET 61, so that the first transistor 68 is connected to the ground. 3. The transistor 68 is turned ON, and the gate charge of the FET 61 is removed to turn the FET 61 OFF.

In addition, by changing the ON time (pulse width) of FET61, the output voltage is driven and controlled by PWM control with time ratio control, and the ON signal (PWM signal) of FET61 is made hard to be heard by the user's ears. The frequency is made, for example, 8 kHz or more.

The hearing range most sensitively reflected by the average human audible range is close to 4kHz. When the electromagnet 34 is energized with the PWM signal in the vicinity, as shown in this embodiment, since the front end of the pushing member 37 is in contact with the left and right doors 20a, 20a, 20b contact, so the above-mentioned PWM signal is transmitted to the left and right doors 20a, 20b to generate a vibration sound, which is often felt as noise to the user. Also, since the frequency of the PWM signal is made too low, the pressing member 37 cannot protrude sufficiently. Therefore, the PWM signal set to a high frequency of 8kHz or higher can reliably open the door in addition to eliminating the hearing range where perceivable noise can be felt.

In addition, since the right opening circuit 52 has the same structure as the left opening circuit 51, its description will be omitted.

Next, the operation of the door opener 30 when the left door 20a is opened will be described with reference to the time chart of FIG. 1 .

Under the state that left door 20a has been opened, owing to need not make the left door opening mechanism part 31 of door opening device 30 operate, so when left door switch 26a is made OFF, promptly when outputting the closing signal, when by the user When the left door opening switch 27a is pushed to be turned ON during the time ta, a drive signal is output to the control device 50 to energize the left door opening mechanism part 31 .

Utilize the driving of the left door opening mechanism part 31 to make the pushing member 37 stretch out and push the left door 20a, the adsorption of the magnetic washer 21a is pulled away, and as shown in Figure 7 in the time of tb, the left door switch 26a is turned Make ON to output door open signal.

When the control device 50 receives the door-opening signal, it considers that the magnetic washer 21a of the left door 20a is pulled away to open the door to a predetermined position, and conducts power supply for a predetermined time from the time tb to the time tc, for example, energizing for 0.1 second. Furthermore, the left door 20a is fully opened.

According to the above configuration, since the door switch is used to supply power to the door opener after a predetermined time elapses from when the door open signal is output, the door can be reliably opened.

In the past, when the door opening switch was turned ON, since the preset voltage was only supplied to the electromagnet for a predetermined time, for example, 0.2 seconds to 0.3 seconds, the closing time of the door and the placement of the storage bag When the force required to open the door is changed accordingly, the door cannot be opened sufficiently because the door is opened too weakly, or the food placed in the storage bag falls due to being too strong.

Specifically, the force to open the door of the refrigerator depends on the elapsed time after the door is closed. Immediately after closing the door, since the temperature in the refrigerator becomes low after a certain period of time after the door is closed, the pressure in the refrigerator decreases due to the compression of the air in the refrigerator, and the difference between the atmospheric pressure and the pressure in the refrigerator increases.

Generally, the internal pressure of the refrigerator is lower than that of the outside air. When the door is opened, the force applied in the direction of closing the door is relatively large, and the force required to open the door to pull the magnetic gasket away is also increased. Therefore, even if the specified voltage is the same If the ground is supplied to the electromagnet, it is often impossible to open the door, or the door opening speed is too fast.

Also, when the weight of the food placed in the storage bag is different, or if dirt adheres to the magnetic gasket, the force required to open the door changes due to its viscosity.

Therefore, with the present invention, when pulling away the magnetic gasket whose force required to open the door changes greatly, specifically, when the door switch is used to output the door opening signal, the door opening device must be energized, or the door opening device must be energized. After the door is opened without a large change in the required force, the door can be opened optimally by continuing the power supply to the door opening device for a predetermined time.

In addition, in this embodiment, the refrigerator with the side-by-side door was demonstrated, but in this invention, the same effect can be exhibited also about the form of a single door.

Moreover, it is preferable to set it as an upper limit value, for example, 1.5 seconds, between ta-tb which turn on the door open signal of a door switch after turning ON a door open switch. Usually, it is 0.2 to 0.3 seconds, but if there is an obstacle in front of the door and the door cannot be opened, if the current is energized without restriction, the electromagnet may become high temperature and burn out. Therefore, such troubles can be prevented by setting in advance an upper limit obtained through experiments or the like so that such troubles do not occur.

And, after detecting the time tb of opening the door, since there is no need for a greater door opening force than when the magnetic washer is pulled away, the output voltage can be lowered by changing the PWM load, or as shown by the dotted line in FIG. The output voltage is gradually reduced.

Then, for other embodiments, refer to Fig. 2 showing a time chart of the action of the door opening device for opening the other door in a state where the door is opened, and Fig. 8 showing a top view of the refrigerator when the right door is opened. In the state where the door is opened, FIG. 9 , which is a plan view of the refrigerator when the left door is opened, will be described. In addition, descriptions of the same structures are omitted due to repetition.

In the state where the left and right doors 20a, 20b are all closed, when either side, here the right door switch 27b is turned ON in the time of td, the right door opening mechanism part 32 is energized, as shown in Figure 8, the right door When the door opening signal of the right door switch 26b is turned ON during the time te when the door is opened by the door 20b, the right door 20b is opened by energizing for 0.1 second during the predetermined time from te to tf. In this case, the right door switch 26b continues to be in the ON state.

Since neither of the doors becomes a negative pressure in the opened state, and one of the magnetic washers 21a, 21b is not attracted to the rotary partition plate 25, the force required for door opening can be reduced. Therefore, when the door is opened with the same force as when the door is closed, the pressing member protrudes too strongly, and the food placed in the storage bag may fall or the like.

Therefore, in this embodiment, the predetermined time from opening the door to turning off the energization is made shorter than when one of the doors is closed.

Specifically, in the time of tg, in order to open the other door that has not been opened, here the left door 20a, when the user turns on the left door switch 27a, the electromagnet 34 of the left door mechanism 31 is turned on. When electricity is applied, the left door 20 a is pushed by the push member 37 .

And, as shown in FIG. 9, when the magnetic washer 21a is pulled away and the door opening signal of the left door switch 26a is turned ON during the time of th, the door is closed at a predetermined time shorter than that when the door is closed from the time of th. The energization is performed for a shortened time, here 0.05 second, and the energization is terminated within the ti time.

With the above structure, when the other door is opened in the state where either door is open, the predetermined time from opening the door to cutting off the energization is made shorter than when the door is closed, and the door can be opened optimally by reducing the door opening force.

In this case, as shown by the dotted line in FIG. 2 , making the PWM load variable, reducing the power supply voltage to the electromagnet 34 to, for example, 70% to 80%, and performing energization can also replace the method of shortening the energization time. opening force.

Moreover, when the door on which the rotating partition plate 25 is installed, here the left door 20a is opened, the reason why the greatest load is applied is that when the rotating partition plate 25 is rotated, depending on the form of the refrigerator, even the left door When the door switch 26a is in the ON state, the rotating partition plate 25 may be rotating. Therefore, even if the right door 20b is opened, the opening force for the left door 20a may not be lowered in some cases. Therefore, in such cases, preferably, it is only suitable for doors without a rotating partition 25 .

In addition, for other embodiments, refer to Fig. 3 of the time chart of the action of the door opener when the time from the door open switch to the door switch is made ON is shorter than the energization change time, and the time chart of the door opener for the longer occasion. The timing diagram of the action is illustrated in Figure 4. In addition, descriptions of the same structures are omitted due to repetition.

As mentioned above, since the force required to open the door varies greatly according to the usage status of the refrigerator 1, it is better to change the door opening force appropriately. The time until the door switch is turned ON changes the door opening force.

Specifically, as shown in FIG. 3 , when either side, here, the left door 20a is opened, when the user turns ON the left door switch 27a during the time tj, the power supply to the left door mechanism part 31 is started. And the left door 20 a is pushed by the push member 37 .

At this time, the control device 50 measures in advance the time from the time tj to the time when the left door switch 26 is turned ON, and compares the measured time with a preset energization switching time, for example, 0.5 seconds. When this measurement time is shorter than the energization switching time, especially when it is judged that it is not necessary to increase the door opening force, the time from tk after the left door switch 26a is made ON is as usual within a predetermined time, for example, 0.1 second or less than the predetermined time. The energization is performed during a short shortened time, for example, 0.05 second, and the energization is terminated during the time t1.

On the other hand, as shown in FIG. 4 , when the measurement time from the time tj to turning ON the left door switch 26a is longer than the energization switching time, it is judged that it is necessary to increase the door opening force, and the left door switch 26a is turned ON. After the time tm to an extended time longer than the predetermined time, for example, 0.1 second or as a usual predetermined time, for example, 0.1 second, the energization is performed, and the energization is terminated during the time tn.

With the above-mentioned structure, in order to change the energization time according to the time required to open the door, even if the force required to open the door changes due to the influence of the food load placed in the storage bag, the door can be opened optimally. The door opening force of the device is changed. In addition, in the present embodiment, the same effect can be obtained even in a one-door refrigerator, and the PWM load can be used to variably increase or decrease the output voltage instead of changing the energization time.

The above-mentioned embodiment of the present invention is an example, and various combinations may be made to optimize the illustrated numerical values. In addition, the door opener is not limited to a mechanism that protrudes the pressing member by energization of the electromagnet, and various changes can be made.

Next, other embodiments of the present invention will be described. Fig. 13 is a perspective view showing a refrigerator according to another embodiment of the present invention, and Fig. 14 is a diagram showing a state in which the door of the refrigerator in Fig. 13 is opened. In this Fig. 13 and Fig. 14, in the refrigerator body 1 constituted as a heat-insulated box of a known structure, a refrigerating chamber 2, a vegetable chamber 3, and an ice-making chamber 4 are arranged in order from top to bottom. The switch chamber 5 and the freezer chamber 6 for switching the internal temperature of the layers, and the ice making chamber 4 and the switch chamber 5 are arranged side by side.

Hereinafter, in order to avoid redundant descriptions, only the parts different from the foregoing embodiments will be described.

The structure of FIG. 13 differs from the aforementioned FIG. 5 in the following points.

On the front of the right door 20b, there is an operation unit 28 for adjusting the temperature of the storage room, etc., and the operation of the operation unit 28 can also switch from the normal cooling mode and the shop display mode to the shop display mode described later.

Next, the structure of FIG. 14 is compared with the above-mentioned FIG. 6 , and a push switch 81 and a weight sensor 83 are added.

Moreover, the top view which shows the refrigerator 1 when the left door 20a is opened is the same as FIG. 7 mentioned above.

Next, the control circuit of the present invention will be described with reference to the control block diagram of FIG. 16 .

The structure of Fig. 16 corresponds to Fig. 10 of the control block diagram of the aforementioned embodiment.

Hereinafter, in order to avoid redundant descriptions, only the parts different from the foregoing embodiments will be described.

The control device 50 inputs a door opening signal or a door closing signal from the left door switch 26a and the right door switch 26b according to the door opening states of the left and right doors 20a, 20b, and inputs a driving signal from the left door opening switch 27a and the right door opening switch 27b.

When the control device 50 inputs the closing signal and the driving signal based on these signals, the load detection means 80 described later determines the output PWM load, and outputs the PWM signal to the left opening circuit 51 or the right opening circuit 52 .

Next, the left-opening door circuit 51 will be described. One terminal of the electromagnet 34 is connected to the positive output terminal of a voltage doubler rectifier circuit not shown, and the other terminal is connected to the drain side of the driving FET 61 . Furthermore, a diode 62 is connected in parallel to both terminals of the electromagnet 34 .

This FET61, when the drive signal of the left door open switch 27a is input to the control device 50 in the door close signal of the left door switch 26a, becomes the state that is turned ON by the PWM signal from the control device 50 (the control power supply is, for example, DC 15V). , The driving power is, for example, DC 200V).

Next, in FIG. 16 , a specific structure for driving the FET 61 ON/OFF will be described, and the description of the same parts as those in the previous embodiment shown in FIG. 10 will be omitted.

In addition, since the right opening circuit 52 has the same structure as the left opening circuit 51, its description will be omitted.

Next, the load detection means 80 will be described. The load detecting means 80 is provided in the control device 50, and detects the load when the door is opened, such as input values of various switches and sensors, and in this embodiment, the presence or absence of food can be detected.

Specifically, the push type switch 81 is arranged on the bottom surface or back of the storage bags 23a, 23b of the left door 20a and the right door 20b, and when beverages such as small bottles and food are stored in the storage bags, the food can be used. The container or the like pushes the push switch 81 to determine that food is placed. Conversely, when the food is taken out, since there is no push from the food, it is determined that no food is placed.

In this case, the infrared sensor 82 may be used instead of the push switch 81, and in a refrigerator in which the user can manage the food arbitrarily placed in the storage bags 23a, 23b by inputting the operation part 28 or the like. , according to its information can also judge the presence or absence of food.

Next, the operation of the door opening device 30 at the time of door opening will be described with reference to the flowchart of FIG. 12 . In addition, for simplification of description, the opening of the left door 20a will be described as an example.

In step S1, in the state where the left door 20a is opened, since the door opener 30 does not need to be operated, it is detected whether the left door switch 26a is OFF, and if it is OFF, the process proceeds to step S2.

In step S2, when the left door switch 26a outputs the door closing signal, it is detected whether the left door open switch 27a is pushed by the user.

In step S3 , the load when the left door 20 a is opened is detected by the load detection means 80 .

This is because, for example, when food such as a small bottle with a heavy load is placed in the storage bag 23a, and when it is not placed, the force required to open the door is different, and the door opening device 30 is activated according to the presence or absence of the food. The door opening force is variable.

At this time, when the electromagnet 34 is energized with a constant output voltage, the opening degree is small when the food is placed, or the opening degree is too large when the food is not placed, and the rotation stopper of the hinge part not shown in the figure When the collision is performed, noise may occur due to the louder collision sound.

Therefore, in step S4, it is judged whether the load when opening the door is heavy. In this embodiment, it is judged whether food is placed in the storage bag 23a. And proceed to step S5, if no food is placed, then it is judged that the load when opening the door is light and proceed to step S6.

In step S5, the door opening force is increased. Specifically, the PWM duty to the door opener 30 is set high, for example, 100%. On the other hand, in step S6, the door opening force is reduced. Specifically, the PWM duty of the left door opening device 31 is set low, for example, 90%.

And, in step S7, the left door opener 31 is energized according to the individually set PWM duty. In this way, the left door 20a is pushed and opened by an appropriately determined door opening force of the door opening device 30, and the energization is turned off after a lapse of a predetermined time, for example, 3 seconds.

With the above structure, by increasing the door opening force of the door opener 30 when it is judged that the load when opening the door is heavy, or by reducing the door opening force of the door opener 30 when it is judged that the load when opening the door is light, it is possible to prevent the door from being too strong or too weak. to perform the most appropriate door opening.

Also, since the load when opening the door is judged based on the presence or absence of food, and the load applied when opening the door can be reliably detected, the door can be opened optimally.

In addition, in the above-mentioned structure, the operation of the door opening device 30 when the left door 20a is opened is described, and the right door 20b is also operated in the same way, and as a method of increasing or decreasing the door opening force, the energization time can also be changed. lengthen or shorten. In addition, different door opening forces can also be determined according to the quantity of food.

Next, other embodiments will be described. In this embodiment, the load at the time of door opening is detected by the load detection means 80 based on the weight of the foodstuffs placed in the storage bags 23a and 23b.

Specifically, the weight sensor 83 is arranged on the bottom surface of the storage bag 23a, 23b, as shown in FIG. The means 80 judges the load applied when opening the door. For example, if the detected weight is 1 kg or more, it is determined that the load is heavy, and if it is less than that, it is determined that it is light.

According to the above structure, since the load applied to the doors 20a and 20b can be reliably detected, and the load at the time of door opening can be detected more reliably, the doors can be opened optimally.

Next, other embodiments will be described. In this embodiment, both the left door switch 26a and the right door switch 26b are used to detect the load applied when the left and right doors are opened according to the time when the door closing signal is output.

The force to open the doors 20a and 20b of the refrigerator 1 depends on the closing time. Immediately after the door is closed, the temperature inside the refrigerator becomes low when a certain amount of time has elapsed after the door is closed, so the pressure inside the refrigerator decreases at the same time, and the difference between the atmospheric pressure and the pressure inside the refrigerator increases.

Generally, the increase in the difference between the outside air and the pressure inside the refrigerator is due to the fact that when the doors 20a, 20b are opened, the force applied in the direction of closing the door is large, and the force required to pull the magnetic gaskets 21a, 21b apart to open the door is of course Therefore, even if a predetermined voltage is similarly supplied to the electromagnet 34, the door cannot be opened, or the door opening speed is too fast.

Therefore, the left and right door switches 26a, 26b all output the state of the door closing signal. If a predetermined time passes, such as more than 1 hour, then due to negative pressure in the refrigerator, it is considered that the load when opening the door increases and the door opening force increases ( For example, PWM load is 100%). Conversely, if the predetermined time has not elapsed, it is assumed that the negative pressure is not present and the door opening force is reduced (for example, the PWM duty is 70%).

With the above structure, even if the refrigerator has not opened the door for a long time and the force required to open the door changes, since the door opening force is variable according to the door closing time, the door can be opened optimally.

Next, another embodiment will be described as a method of judging the load applied to the left and right doors. The load detecting means 80 can detect the load applied when the door is opened by comparing the measured time from the output of the drive signal for the previous door opening to the output of the current door opening signal with a predetermined time set in advance.

Usually, the load on the side of the left door 20a that is provided with the rotating partition plate 25 is heavy when the door is opened. The load at the time of door opening increases, making it difficult to open the door from the left door 20a in advance.

Therefore, in the previous door opening operation of the left door 20a and the right door 20b, after the door opening switches 27a, 27b were respectively operated to the time to open the door this time, specifically, the left door switch 26a and the right door switch 26b The measurement time until each output of the door opening signal is recorded in the control device 50 in advance. In addition, when the door opening switches 27a and 27b are operated, it is determined that the one whose measurement time is shorter opens the door has a lighter load.

This is because the time before and after the use of the door opener 30 is usually short, there is no change in the dirt on the magnetic washers 21a, 21b, and the last measurement time can be regarded as the load when actually opening the door.

Therefore, according to the above-mentioned structure, the door can be opened from the light load side more reliably.

Next, other embodiments will be described. In the present embodiment, when the other door is opened in a state where the door open signal is output by one of the door switches 26a and 26b, it is determined that the load at the time of door opening is light.

As mentioned above, in the state where both doors 20a, 20b are closed, since the inside of the refrigerator becomes a negative pressure, the load when opening the door increases, and when either door is opened, the negative pressure does not occur. The load when opening the door is reduced.

Again, as the main factor of the load when the door is opened, only the pull-off of the magnetic washers 21a, 21b is considered, and if any one is opened, the magnetic washers 21a, 21b on the opposite surfaces of the two doors 20a, 20b have been pulled away. Pull away, so the load when opening the door is reduced.

Therefore, in this embodiment, as shown in FIG. 15 , when the left door 20a or the right door 20b is opened, it is detected whether the other door has been opened, and if the door has been opened, it is considered that the load when opening the door is small. , the door opening force is reduced (for example, the PWM duty is 50%).

According to the above structure, in the side-by-side refrigerator, when one side door is opened, since the door opening force is reduced, the door can be opened optimally.

Next, other embodiments will be described. In this embodiment, a description will be given of a configuration in which only a store display mode is provided in which predetermined electrical components are operated without cooling the refrigerator 1 .

The store display mode is a mode for promoting sales in a store. Generally, since the inside of the refrigerator does not need to be cooled in the store, the operation of the compressor is stopped, and only the lights and fans in the refrigerator are operated.

Also in this mode, the door opener 30 is set to be driven, but since the inside of the refrigerator is not cooled, the inside of the refrigerator does not become negative pressure. Therefore, when the door opening device 30 is operated with the same door opening force as in the cooling operation, the door opening speed may be increased too much. Moreover, since no foodstuffs are placed in the store, the load at the time of opening the door is also light.

Therefore, when the store display mode is put into the store display mode by operating the operation part 28, since the inside of the refrigerator does not become a negative pressure, it is judged that the load at the time of door opening is light, and by reducing the door opening force (for example, the PWM load is 70%), it can be realized. Open the door most appropriately.

Next, other embodiments will be described. In this embodiment, only when the door on the side where the rotating partition plate 25 is provided is opened and the other door is opened, it is judged that the load at the time of door opening is light.

The load when opening the door, as described above, changes depending on whether food is placed, whether there is negative pressure in the refrigerator, or whether either door is opened, and the rotating partition plate 25 is rotated to become the load applied when opening the door. One of the main factors of load.

Therefore, in order to reliably open the left door 20a provided with the rotary partition plate 25, the door opening force of the door opening device 30 is set, but since the maximum load is applied to the rotation of the rotary partition plate 25, there are other reasons. Unfavorable situation in which the door opening force is increased or decreased due to certain factors.

Therefore, only when the door on one side of the rotating partition plate 25 is opened and the other door is opened, it is determined that the load when opening the door is light. The door on one side of the plate 25 can be opened, and the door on the other side can be opened according to the specifications of the refrigerator, etc., so that the door can be opened optimally.

In addition, the above-mentioned structure is one embodiment of this invention, and various changes are possible. For example, the energization to the electromagnet 34 is turned off after a predetermined time has elapsed, and the energization may be turned off after a predetermined time elapses after the door open signal is output from the door switch after the start of energization.

Next, other embodiments of the present invention will be described. Fig. 13 is a perspective view showing a refrigerator according to the present invention, and Fig. 14 is a diagram showing a state in which the door of the refrigerator in Fig. 13 is opened. In this Fig. 13 and Fig. 14, in the refrigerator main body 1 constituted as a heat-insulated box body of a known structure, a refrigerating chamber 2, a vegetable chamber 3, an ice-making chamber 4 are arranged in order from top to bottom. The switch chamber 5 and the freezer chamber 6 for switching the internal temperature of the freezer, and the ice making chamber 4 and the switch chamber 5 are arranged side by side.

Hereinafter, in order to avoid redundant descriptions, only the parts different from the foregoing embodiments will be described.

In FIG. 13 , an operation unit 28 for adjusting the temperature and the like of the storage compartment is provided in front of the right door 20 b.

Moreover, the top view which shows the refrigerator 1 when the left door 20a is opened is the same as FIG. 7 mentioned above.

Next, the control circuit of the present invention will be described with reference to the control block diagram of FIG. 16 . The control device 50 inputs a door opening signal or a door closing signal from the left door switch 26a and the right door switch 26b according to the door opening states of the left and right doors 20a, 20b, and inputs a drive signal from the left door opening switch 27a and the right door opening switch 27b.

Hereinafter, in order to avoid redundant descriptions, only the parts different from the foregoing embodiments will be described.

In addition, since the right opening circuit 52 has the same structure as the left opening circuit 51, its description is omitted, but the left opening circuit 51 and the right opening circuit 52 are electrically independent.

This is because an electric circuit generally has a noise filter circuit composed of a common mode choke coil that removes noise from the outside. If the current capacity of the noise filter circuit is ensured by enlarging the coil, it is necessary to ensure the current capacity of the noise filter circuit. However, if it is electrically independent as in the present embodiment, it is not necessary to increase the current capacity, so it can be miniaturized.

Next, the operation of the door opening device 30 at the time of door opening will be described. In addition, since the operation|movement of opening the left door 20a and the right door 20b is the same, the left door 20a is taken as an example and demonstrated.

Since the left door 20a has been opened, the left door opening device 31 does not need to be operated, so when the left door switch 26a outputs the door closing signal, that is, when it is turned OFF, the user pushes the left door opening switch 27a. On the other hand, when turned ON, a drive signal is output to the drive device 50 to energize the left door opener 31 .

At this time, the pressing member 37 protrudes to press the left door 20a, pulls the magnetic washer 21a away, and as shown in FIG. 16, the left door switch 26a is turned ON to output a door open signal. Normally, the time until the left door switch 26a is turned on after the left door switch 27a is turned ON is 0.2 seconds to 0.3 seconds.

When the control device 50 receives the door opening signal, it is estimated that the magnetic washer 21a is pulled away to a predetermined position to open the door, and the left door 20a is fully opened from this time to a predetermined time of energization, for example, 0.1 second.

Next, the operation|movement of the left-right door opener at the time of operating the other door opener switch at the time of energizing to one door opener is demonstrated with reference to the flowchart of FIG. 17. FIG. In addition, here, the case where the right door opening switch 27b is operated at the time of energizing the left door opening device 31 is demonstrated as an example.

In step S11, because if left door 20a and right door 20b have opened the door just need not make door opener 30 act, so whether all make OFF to left door switch 26a and right door switch 26b detect (step S11), if If it is OFF, the process proceeds to step S12. Moreover, when one door is opened, when the other door switch is operated, it will be in the state which starts to energize the door opener by the side of the other door as usual. Of course, since one door is already opened and the load applied to the door opening is reduced, the door opening force can also be reduced.

In step S12, it is detected whether the left door opening switch 27a or the right door opening switch 27b has been operated (step S12), if operated, it is determined that the door is opened by the user and the process proceeds to step S13.

In step S13, detect whether to operate the door-opening switch of the other side, that is, detect whether the door-opening switches 27a, 27b are operated simultaneously (step S13), if operated then enter step S14, if not operated then enter step S15.

In step S14, it is detected whether a predetermined time, for example, 0.02 seconds has elapsed since one of the door opening switches was operated (step S14). That is, even if it is at the same time, there is usually a time lag for the user's operation. If the other door opening switch is operated within a predetermined time after operating one door opening switch, it can be regarded as simultaneous operation.

Therefore, if even through this specified time, the other door opening switch is not operated, it is judged that it is not operated at the same time, enter step S15, as mentioned above, start to operate the door opening device 30 on the side of the door opening switch, here to the left door opening device 31 is powered on (step S15). On the other hand, when the predetermined time has not passed, the process returns to step S13.

In addition, since the predetermined time is the time when the door opener 30 is not energized, if it is set to a relatively long time, even if the door open switch is operated, the door opener 30 will not operate at all, and there is a possibility that Since it gives a sense of discomfort to the user, it is preferably 0.05 seconds or less.

In step S16, it is detected whether or not the energization of the left door opener 31 is completed (step S16). Specifically, it is detected whether a predetermined time has elapsed since the left door switch 26a was turned ON from the power on, and if the predetermined time has elapsed, the process proceeds to step S17.

In step S17, detect (step S17) whether to operate the door-opening switch 27 of the other side in the energization of left door-opening device 31, be the right door-opening switch 27b here (step S17), if operated then enter step S18, begin to The door opener 30 on the operating side is energized, here, the right door opener 32 is energized (step S18).

That is, in the energization to one door opener, even if the other door open switch is operated, the energization to the other door opener is not performed due to the completion of the energization to the one door opener, so the left and right cannot be overlapped. The energization of the door opening device prevents excessive current from flowing.

In addition, as described above, depending on the user's operation, the left and right door openers may be simultaneously operated, and the operation at the time of the simultaneous operation will be described below.

In step S19, the load at the time of door opening of right and left door 20a, 20b is judged (step S19). As an example, generally, since the side provided with the rotating partition plate 25 is subjected to a large load when rotating, it is judged that the load is heavy when the left door 20a provided with the rotating partition plate 25 is opened.

In step S20, power supply is started from the side of the lightly loaded door determined in step S19 (step S20). Here, since the load on opening the right door 20b is lighter than that of the left door 20a without providing the rotary partition plate 25, the right door 20b is opened by starting to energize the right door opening device 32.

At this time, as shown in FIG. 15 , even if the left door opening switch 27a is operated earlier at the same time as compared with the right door opening switch 27b, the right door opening device 32 can be energized to open the door from the right door 20b.

In step S21, same as step S16, in order to prevent overlapping ground energization to left and right door openers 31,32, here, detect whether the energization of right door opener 32 ends (step S21), if energization ends, then enter step S22.

In step S22, energization of the heavily loaded door judged in step S16 is started (step S22). Here, in order to open the left door 20a, power supply to the left door opening device 31 is started.

In this way, the reason for opening the door from the side with the lighter load is that in the present embodiment, when the door switch is turned ON to the door opener after a predetermined period of time, since at least the door switch is not turned ON, the other door opener will not be energized. It takes time (for example, 0.5 seconds to 1.5 seconds) for the door switch to be turned ON when the power is applied from the side of the heavy-loaded door, and the other door does not open at all, so it may give the user a sense of discomfort. .

Therefore, even if the door opening switches 27a and 27b are operated at the same time, since the door is opened from the side with the lighter load when opening the door, the door can be opened by reliably operating the door opening device 30 without giving a sense of discomfort to the user.

With the above-mentioned structure, even if the other door-opening switch is operated while the one door-opening device is energized, the other door-opening device will not be energized until the energization is completed, so it is possible to prevent overlapping operation of the left and right doors. Since the door opening device is energized, the automatic circuit breaker operation of the commercial power supply can be avoided.

In addition, when the door opening switch is operated at the same time, by opening the door from the door that is not provided with the rotating partition plate that applies the load when opening the door, since the door can be opened from the side with the lighter load, it will not give the user a sense of discomfort. The door opening device can be operated reliably.

Next, another embodiment will be described as a method of judging the load applied to the left and right doors.

A load detection means 80 is provided in the control device 50 to detect the load when the door is opened, such as input values of various switches and sensors, and detect the presence or absence of food in the present embodiment.

This is due to the following reasons: the load when opening the door is different when placing food such as a heavy-duty small bottle in the storage bag 23a and when not placing it. It is a matter of course in the form, and even in the form of the refrigerator installed as in the present embodiment, the load on the door on the non-installed side may become heavy depending on the presence or absence of food.

Specifically, the push type switch 81 is arranged on the bottom surface or back of the storage bags 23a, 23b of the left door 20a and the right door 20b, and when beverages such as small bottles and food are stored in the storage bags, the A food container or the like pushes the push switch 81 to determine that food is placed. Conversely, if the food is taken out, since there is no pushing by the food, it is determined that the food is not placed.

In addition, the infrared sensor 82 may be used instead of the push switch 81, and in a refrigerator in which the user can manage the food arbitrarily placed in the storage bags 23a, 23b by inputting the operation part 38 or the like, according to this Information can also be used to determine the presence or absence of food.

As an action, in step S19, the presence or absence of food on the left door 20a and the right door 20b is detected by the load detection means 80, and when it is judged that food is placed on one of the left and right doors 20a, 20b, the other door When it is determined that no food is placed, the door on which no food is placed is determined to be lightly loaded. In addition, when it is determined that food is not placed on either of the left and right doors 20a, 20b, or that food is placed, the door on which the rotary partition plate 25 is not provided may be determined to be heavily loaded.

According to the above-mentioned structure, since the loads of the left and right doors can be detected respectively according to the use status of the user, the door can be opened from the side with the lightest load reliably.

In addition, when the presence or absence of food can be detected multiple times, the load can also be judged based on the number of foods.

Again, not only the presence or absence of food, but also the weight sensor 83 is arranged on the bottom surface of the storage bag 23a, 23b. As shown in FIG. , 20b to judge the load, the load when opening the door can be detected more reliably than the presence or absence of food.

Next, another embodiment will be described as a method of judging the load applied to the left and right doors. The load detecting means 80 can detect the load applied when the door is opened by comparing the measured time from the output of the drive signal at the previous door opening to the output of the current door opening signal with a predetermined time set in advance.

Usually, the load on the left door 20a with the rotating partition plate 25 is heavy when the door is opened, and when dirt adheres to the magnetic gasket 21b of the right door 20b that is not installed, the right door 20b tends to be damaged due to the adhesive force. The load at the time of door opening increases, making it difficult to open the door from the left door 20a in advance.

Therefore, in the previous door opening operation of the left door 20a and the right door 20b, the time from when the door opening switches 27a, 27b are respectively operated to when the door is opened, specifically, the left door switch 26a and the right door switch 26b are set to the respective opening times. The measurement time at which the door open signal is output is recorded in the control device 50 in advance. And when the door opening switches 27a and 27b are operated, in step S19, it is judged that the one with the shorter measurement time is that the load at the time of door opening is lighter.

This is because the time before and after using the door opener 30 is usually short, the dirt on the magnetic washers 21a, 21b does not change, and the last measurement time can be regarded as the load at the time of actual door opening.

Therefore, according to the above-mentioned structure, the door can be opened from the light load side more reliably.

In addition, the above-mentioned structure is an Example of this invention, Various combinations are possible, and the numerical value illustrated can be optimized according to the form of a refrigerator. For example, the energization to the door opener 30 ends after a predetermined time elapses after the door switch is turned ON, but it may be configured to perform energization for a predetermined time, for example, 1 second, after the door open switch is operated.

Moreover, the present invention, because it is the operation method of the door opener when operating the other side's door open switch during the energization to one door opener, or when operating the door open switch at the same time, so it can also be adapted to not having the rotating partition plate 25. side-by-side refrigerator.

Industrial availability

As mentioned above, according to this invention, a door can be opened optimally using a door opener, and it can adapt to various refrigerators equipped with a door opener.

As described above, according to the present invention, even when the other door opening switch is operated during the energization of one door opening device, or when the door opening switch is operated at the same time, the door can be reliably opened, and it can be adapted to various types of door opening devices. A side-by-side refrigerator.

Claims (16)

1. A refrigerator comprising: a door freely openable and closable provided at the front opening of a storage room of the main body; and a door opening device for extending a pushing member to push the door surface and open the door when a driving source is energized. ; the door opening switch that drives the driving signal of the door opening device through the user's operation output; In the state where the door opening switch outputs a drive signal, the door opening device is powered on, and the power supply is continued until a predetermined time elapses after the door opening signal is output by the door switch. 2. A refrigerator, characterized in that it has: a left door and a right door of the opening and closing type provided at the front opening of the storage room of the main body freely; a left door opening device and a The right door opening device; the left door opening switch and the right door opening switch respectively driving the left and right driving signals of the left and right door opening devices through the user's operation output; and detecting the opening state of the left and right doors, and outputting the door opening signal and the door closing signal respectively the left door switch and the right door switch, In the state where the door-closing signal has been output from the left and right door switches, when the drive signal is output from one of the door-opening switches, the corresponding door-opening device is energized. time to continue to energize at the specified voltage, In the state where the door opening signal has been output from any one of the left and right door switches, when the drive signal is output from the other left door switch or right door switch, the corresponding left door switch or right door switch is used to output the door open signal. After the signal, the energization is continued for a time shorter than the predetermined time or at a voltage lower than the predetermined voltage. 3. The refrigerator according to claim 1 or 2, wherein when power is supplied to the door opener, when the time from outputting the driving signal to outputting the door opening signal is less than or equal to a preset energization change time, the predetermined The time is short or the energization voltage is low. 4. A refrigerator, characterized in that it has: the left door and the right door of the front opening of the storage room of the main body that can be opened and closed freely; device and the right door opening device; the left door opening switch and the right door opening switch that output the drive signal through the user's operation, respectively energize the left and right door opening devices; and the load detection means for detecting the load applied when the left and right doors are opened, When opening both or any one of the doors, when it is determined by the load detection means that the load at the time of door opening is light, the door is opened while reducing the door opening force of the left and right door openers. 5. The refrigerator according to claim 4, wherein the load detection means measures the load applied to the left and right doors when the doors are opened, based on the presence or absence of food placed in the storage bags provided on both or any one of the doors. to test. 6. The refrigerator according to claim 4, wherein the load detection means has a weight sensor provided at the storage bag on both or any one of the doors, and the left and right doors are opened based on the weight detected by the weight sensor. The applied load is tested. 7. The refrigerator according to claim 4, wherein the load detection means has a left door switch and a right door switch for detecting the opening and closing states of the left and right doors respectively, and the load detecting means has a left door switch and a right door switch which are detected by the left and right door switches. The closing time of the door is determined, and the load applied when the left and right doors are opened is detected. 8. The refrigerator according to claim 4, wherein the load detection means includes a left door switch and a right door switch for detecting the opening and closing states of the left and right doors, and the load detection means detects the load from the last operation of the door switch. The time when the door switch on the operating side is in the open state is measured, and the load applied when the door is opened is detected. 9. A refrigerator, characterized in that it has: two side-opening left and right doors that are freely openable and closed at the front opening of the storage room of the main body; The device and the right door opening device; the left door switch and the right door switch that output the driving signal through the user's operation, respectively energize the left and right door opening devices; and the left door switch and the right door switch that detect the opening and closing states of the left and right doors respectively. door switch, Under the state that utilizes this left and right door switches to the situation that either side door is opened the door has been detected, when the other side's door is opened, it is judged that the load when opening the door is light, and the left door opener or the right door opener is turned on. The door is opened with a reduced door opening force. 10. A refrigerator, characterized in that it has: two side-opening left and right doors that are freely openable and closed at the front opening of the storage room of the main body; The device and the right door opening device; the left door switch and the right door switch that output the driving signal through the user's operation and respectively energize the left and right door opening devices; and the store display mode that only operates the specified electrical components without cooling the refrigerator, In this shop display mode, when both or either of the left and right door opening switches are operated, it is determined that the load is light when opening the door, and the door is opened with the left or right door opening force reduced. 11. The refrigerator according to any one of claims 4 to 10, characterized in that the left or right door is provided with a rotating device that rotates according to the opening and closing of the door and closes the relative gap when the door is closed. Only when the door on the side where the rotating partition plate is not provided is opened is the partition plate judged that the load at the time of door opening is light, and the door is opened. 12. A refrigerator, characterized in that it has: two side-opening left and right doors that are freely openable and closed at the front opening of the storage room of the main body; device and the right door opening device; and a left door switch and a right door switch that output drive signals through the user's operation to energize the left and right door opening devices respectively, When the other door opening switch is operated while the one door opener is being energized, the other door opening device is started to be energized after the energization to the door opener is completed. 13. The refrigerator according to claim 12, wherein when the left and right door opening switches are operated approximately simultaneously, the door opening device on the side of the door which is lightest in load when opening the door is started to be energized. 14. The refrigerator according to claim 13, characterized in that the left or right door is provided with a rotating partition plate that rotates according to the opening and closing of the door and blocks the relative gap when the door is closed, and at the same time When operating the left and right door opening switches, the door opening device is energized from the side where the rotating partition plate is not provided. 15. The refrigerator according to claim 13, characterized in that a load detection means for detecting the load applied when the left and right doors are opened is provided, and when the left and right door opening switches are operated substantially simultaneously, the load is The light side starts to energize the door opener. 16. The refrigerator according to claim 15, wherein the load detection means includes a left door switch and a right door switch for detecting the opening and closing states of the left and right doors, and the load detection means is based on the time from when the door was opened last time to when the door has been operated. The door switch on one side detects the measurement time of the door opening state, and detects the load applied when the door is opened.

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