Refrigerator

Abstract

The utility model discloses a refrigerator which comprises a refrigerator, an ice maker arranged in the refrigerator and a control device, the ice maker is provided with an ice cube tray, a water injection device, an ice unloading heater and an ice unloading device, the control device is connected with the ice maker and comprises an ice making module and an ice unloading module, and the refrigerator is characterized in that the ice unloading device comprises a motor, an ice unloading claw and an ice unloading heater, the ice cube tray is installed on the base, a motor box is arranged on one side of the base, the ice unloading claw comprises an ice unloading main shaft and a pulling rod, the ice unloading main shaft is connected with a motor, the control device is provided with a motor current detection device, and the ice unloading heater is closed when the current is smaller than a threshold value. The problem of overheating of the heater caused by temperature sensing delay of the temperature sensor of the ice maker in a traditional deicing control method is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of household appliances, in particular to a refrigerator. Background Art

[0002] At present, luxury large-capacity household refrigerators are generally equipped with ice makers on the door body. The cooling capacity of the ice maker is provided by the refrigerator evaporator. After ice making is completed, heating is used to defrost. The heat source for heating and defrosting comes from the electric heater at the bottom of the ice tray. When the system detects that the water in the ice tray has been completely frozen into solid ice, the defrosting program is started. At this time, the electric heater is started. After heating for several minutes, the defrosting rod rotates to scrape the ice out of the ice tray. Then water is injected to enter the next ice making and defrosting program. However, the inventors found that the prior art has at least the following problems: the installation position of the ice maker temperature sensor is not on the ice tray, and its temperature sensing is delayed, which can easily lead to overheating of the heater and excessive residual water after defrosting. Utility Model Content

[0003] The utility model aims to provide a refrigerator, which can solve the problem of overheating of the heater due to the temperature sensing delay of the ice maker temperature sensor in the traditional de-icing control method, so as to overcome the shortcomings of the prior art.

[0004] The utility model achieves its purpose through the following technical scheme: an electric refrigerator, comprising a refrigerator, an ice maker placed in the refrigerator, and a control device, wherein the ice maker is provided with an ice making grid, a water injection device, an ice-defusing heater, and an ice-defusing device, the control device is connected to the ice maker, and comprises an ice-making module and an ice-defusing module, and is characterized in that the ice-defusing device comprises a motor, ice-defusing claws, and an ice-defusing heater, the ice making grid is mounted on a base, a motor box is provided on one side of the base, the ice-defusing claws comprise an ice-defusing main shaft and a pull rod, the ice-defusing main shaft is connected to the motor, and the control device is provided with a motor current detection device, and the ice-defusing heater is turned off when the current is less than a threshold value.

[0005] A U-shaped ice-removing heater is arranged at the bottom of the ice-making tray.

[0006] A temperature sensor for detecting the temperature of the ice tray is arranged on the motor box side.

[0007] The de-icing device also includes a Hall position sensor and a temperature sensor for detecting the temperature of the ice tray. The Hall position sensor is used to monitor the angular displacement of the de-icing claws. Both the temperature sensor and the Hall position sensor are connected to the MCU of the control device for communication.

[0008] The motor is a stepping motor, and both ends of the de-icing heater are connected to thermal protectors respectively.

[0009] The beneficial effects of the utility model are as follows: the utility model uses the signals of the Hall position sensor and the temperature sensor as input, controls the defrosting operation by setting a motor current detection device, and turns off the defrosting heater when the current is less than a threshold value, thereby overcoming the problem of excessive heating of the heater caused by the temperature sensing delay of the ice maker temperature sensor in the traditional defrosting control method, and perfectly solves the problem of excessive residual water after the ice maker defrosts. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 This is a deicing flow chart of the utility model.

[0011] Figure 2 This is a schematic diagram of the structure of the ice making machine of the utility model.

[0012] Figure 3 This is a schematic diagram of the ice maker base structure of the utility model.

[0013] Figure 4 It is a schematic diagram of the utility model of the crampon rotating to pull out ice.

[0014] Figure 5 This is a block diagram of the deicing control principle of the utility model. DETAILED DESCRIPTION

[0015] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0016] In the description of the present invention, it should be understood that the terms "center", "lateral", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. Unless otherwise specified, "plurality" means two or more.

[0017] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection. It can also be a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0018] See also Figure 1-5 The utility model discloses an electric refrigerator and its electric refrigerator, including a refrigerator (not shown), an ice maker placed in the refrigerator, and a control device (not shown). The ice maker is provided with an ice tray 3, a water injection device (not shown), an ice-removing heater 5, and an ice-removing device. The control device is connected to the ice maker. The control device includes an ice-making module and an ice-removing module. The ice-removing device includes a motor (not shown) and an ice-removing claw 2. The ice tray 3 is installed on a base 6. A motor box 1 is provided on one side of the base. A mask 4 is provided on the ice tray 3. The ice-removing claw includes an ice-removing main shaft 21 and a pull rod 22. The ice-removing main shaft is connected to the motor. The ice-removing device also includes a Hall position sensor and a temperature sensor for detecting the temperature of the ice tray. The Hall position sensor is used to monitor the angular displacement of the ice-removing claw. The temperature sensor and the Hall position sensor are both connected to the MCU of the control device for communication.

[0019] The motor is a stepper motor, and the two ends of the de-icing heater are respectively connected to thermal protectors

[0020] A U-shaped de-icing heater 5 is arranged at the bottom of the ice making tray.

[0021] The control method of the deicing module includes:

[0022] S1) obtains the ice making completion status, starts the de-icing heater, and determines whether the preheating temperature rise reaches the set value Δt.

[0023] S2) when the preheating temperature rise reaches the set value Δt, starting the motor and obtaining the motor running time to determine whether it meets the second preset condition;

[0024] S3) When the motor running time reaches the set value T, the motor current is detected to determine whether the current is less than the threshold value i;

[0025] S4) when the current is less than the threshold value i, the de-icing heater is turned off, the position of the de-icing claw is detected, and it is determined whether the position of the de-icing claw has returned to the original point;

[0026] S5) When the position of the de-icing claws returns to the original point, the motor is turned off and de-icing is completed.

[0027] In step S2, when the preheating temperature rise does not reach the set value Δt, it is calculated whether the heating time reaches the set value T. If the heating exceeds the set value T, it is determined that the heating is abnormal.

[0028] In step S3, when the current is less than the threshold value i, it is detected whether the position of the de-icing claws returns to the origin. If so, the de-icing heater and the motor are turned off. If not, the current temperature signal of the temperature sensor is read and step S6 or step S7 is executed.

[0029] Further, if the current temperature is ≤-3°C, execute step S6; if the current temperature is >-3°C, execute step S7:

[0030] S6) turn off the de-icing heater, and then execute S7);

[0031] S7) Calculate whether the motor running time reaches 400s. If so, determine that the de-icing is abnormal. If not, return to step S3.

[0032] The advantage of setting the preheating temperature rise Δt of the utility model is that: when the heater is turned on, the temperature sensor value is t0, and when (the current temperature sensor value-t0)≥Δt, the preheating temperature rise Δt is reached, and the value of Δt changes with the change of t0 (the lower t0 is, the longer the preheating time is required, and the larger the setting value of Δt is); the setting of Δt is to overcome the problem of delay in the temperature transmission from the aluminum box to the sensor position after the heater is turned on. When Δt is reached, it can be considered that the ice dish has been preheated and defrosting can be started.

[0033] Motor target (running) timing T: This time is the time it takes for the de-icing rod to run from the origin position to the vertical downward position when idling (see Figure 4 ); the reason for performing the next step of current detection after this time point is reached is that this position is the midpoint of the ice tray, and the de-cramping claws must have touched the ice (considering that the ice is very small due to the small amount of water injected, the crampons will touch the ice at this position at the latest). At this position, the de-cramping claws have only two states: the ice is not loose and the ice is loose.

[0034] Motor current threshold i: This threshold is set between the motor stall current value and the idling current value. When the detected current value is less than the threshold, it can be considered that the ice is loose and the heating tube can be turned off, otherwise the heater continues to be turned on; the setting of the current threshold i is to overcome ① the power fluctuation of the heating tube caused by the power supply voltage fluctuation ② the temperature sensing delay from the ice dish temperature to the sensor position.

[0035] All components involved in the present invention may be general standard parts or components known to those skilled in the art, and their structures, principles and control methods are known to those skilled in the art through technical manuals or conventional experimental methods.

[0036] The above description is only a preferred embodiment of the present invention and does not limit the technical scope of the present invention. Therefore, other refrigerators obtained by adopting the same or similar technical features as the above embodiments of the present invention are within the protection scope of the present invention.

Claims

1. A refrigerator, comprising a refrigerator, an ice maker placed in the refrigerator, and a control device, wherein the ice maker is provided with an ice making grid, a water injection device, an ice-removing heater, and an ice-removing device, and the control device is connected to the ice maker and comprises an ice-making module and an ice-removing module, characterized in that: The de-icing device includes a motor, de-icing claws, and a de-icing heater. The ice-making tray is installed on a base. A motor box is provided on one side of the base. The de-icing claws include a de-icing spindle and a pull rod. The de-icing spindle is connected to the motor. The control device is provided with a motor current detection device, which turns off the de-icing heater when the current is less than a threshold value.

2. The refrigerator according to claim 1, characterized in that: A U-shaped ice-removing heater is arranged at the bottom of the ice-making tray.

3. The refrigerator according to claim 2, characterized in that: A temperature sensor for detecting the temperature of the ice tray is arranged on the motor box side.

4. The refrigerator according to any one of claims 1 to 3, characterized in that: The de-icing device also includes a Hall position sensor and a temperature sensor for detecting the temperature of the ice tray. The Hall position sensor is used to monitor the angular displacement of the de-icing claws. Both the temperature sensor and the Hall position sensor are connected to the MCU of the control device for communication.

5. The refrigerator according to claim 4, characterized in that: The motor is a stepping motor, and both ends of the de-icing heater are connected to thermal protectors respectively.

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