CN105737475A - Refrigerator and control method thereof - Google Patents

Abstract

The invention provides a refrigerator and a control method of the refrigerator. The refrigerator comprises a storage compartment, a refrigeration system for providing cold quantity for the storage compartment, a draught fan conveying the cold quantity to the storage compartment and a control system for controlling the refrigerator to run; the refrigeration system and the draught fan are both electrically connected with the control system, and the refrigerator further comprises a rotating speed sensor which is arranged on the draught fan and used for measuring the rotating speed of the draught fan; the rotating speed sensor and the control system are electrically connected, and a preset threshold value used for being compared with the rotating speed of the draught fan is set in the control system; and the rotating speed measured through the rotating speed sensor is compared with the threshold value so as to judge the frosting condition on the draught fan, and comparison is accurate and intuitive.

Description

Refrigerator and control method thereof

technical field

The invention relates to the field of household appliances, in particular to a refrigerator capable of automatically removing frost on a fan and a control method thereof.

Background technique

In existing refrigerators, especially refrigerators with manual air doors, when the temperature in the storage room of the refrigerator is lower than the set minimum temperature, the refrigeration system and the fan will automatically stop running, but the air door will not be automatically closed.

The fan in the refrigerator is generally installed close to the evaporator, and the temperature near the evaporator is relatively low. If the damper is not closed, there will be convection of cold and hot air, so it is easy to generate frost on the fan. Since the fan cannot automatically defrost, when the fan starts to operate again, the presence of frost on the fan will seriously affect the rotation speed of the fan, resulting in a small air volume and reducing the cooling effect.

In view of this, it is necessary to provide an improved refrigerator and its control method to solve the above problems.

Contents of the invention

The object of the present invention is to provide a refrigerator which can automatically remove the frost on the blower fan and its control method.

In order to achieve the purpose of the above invention, the present invention adopts the following technical solutions: a refrigerator, including a storage compartment, a refrigeration system for providing cooling capacity to the storage compartment, and a fan for delivering the cooling capacity to the storage compartment and a control system for controlling the operation of the refrigerator, the refrigeration system and the fan are electrically connected to the control system, and the refrigerator also includes a speed sensor arranged on the fan to measure the speed of the fan , the rotational speed sensor is electrically connected to the control system; a preset threshold value for comparison with the rotational speed of the fan is set in the control system.

As a further improved technical solution of the present invention, the fan includes a support, a number of fan blades arranged on the support, and a ring-shaped first conductor ring and a second conductor ring fixed inside the support, The first conductor ring and the second conductor ring are arranged at intervals; the refrigerator also includes a heating assembly for providing heat to the fan, and the heating assembly includes a heating element arranged on each fan blade, Both ends of each heating element are respectively connected to the wires on the first conductor ring and the second conductor ring, and two brushes respectively in contact with the first conductor ring and the second conductor ring. The brushes are electrically connected with the control system.

As a further improved technical solution of the present invention, the support includes a first wall, a first annular wall fixed on the first wall and extending in a direction perpendicular to the plane where the first wall is located, and a second annular wall. Wall; the first annular wall is located outside the second annular wall, and the first annular wall, the second annular wall and the first wall surround and form a housing for accommodating the first conductor ring and the second conductor ring space.

As a further improved technical solution of the present invention, the first conductor ring is fixed on a side close to the first annular wall in the storage space, and the second conductor ring is fixed in the storage space close to the first annular wall. One side of the two annular walls; along the extension direction of the rotating shaft of the fan, the width of the first conductor ring is smaller than the width of the second conductor ring.

The present invention also provides a control method for controlling the above-mentioned refrigerator, the control method includes a determination method for determining whether it is necessary to remove the frost on the fan, and the determination method includes the following steps: before starting the refrigeration system, start the the fan, collect the speed of the fan, and judge whether the speed is greater than or equal to the preset threshold; if yes, the refrigeration system can be started without defrosting; if not, it needs to be defrosted, stop The fan.

As a further improved technical solution of the present invention, the refrigerator includes a heating assembly that provides heat to the fan; the control method also includes a defrosting method for removing frost on the fan, and the defrosting method includes the following steps : When defrosting is required, after stopping the fan, start the heating assembly, and judge whether the heating time of the heating assembly is greater than or equal to the preset heating time N ₁ min; if yes, stop the heating assembly ; If not, continue to run the heating assembly.

As a further improved technical solution of the present invention, the defrosting method further includes the following steps: after stopping the heating assembly, start the fan to run for a preset running time N ₂ min; after the fan runs for N ₂ min, That is, the refrigeration system can be started.

As a further improved technical solution of the present invention, the control method further includes a starting method for determining whether to start the refrigeration system, and the starting method includes the following steps: acquiring the real-time temperature T ₁ of the storage compartment, and judging the Whether the real _- time temperature T1 has reached the starting point, if so, the refrigeration system needs to be started.

As a further improved technical solution of the present invention, the refrigerator also includes a temperature control device with several temperature gears; the starting method also includes the following steps: before acquiring the real-time temperature T1 _of the storage compartment, determine whether the user Whether to change the temperature gear, if yes, control the refrigeration system according to the changed temperature gear.

As a further improved technical solution of the present invention, the control method further includes a shutdown method for determining whether to stop the refrigeration system after starting the refrigeration system, and the shutdown method includes the following steps: obtaining real-time data of the storage compartment temperature T ₁ , judging whether the real-time temperature T ₁ reaches the shutdown point; if yes, stop the refrigeration system; if not, continue to run the refrigeration system.

The beneficial effect of the present invention is that: the present invention senses the rotational speed of the fan through the rotational speed sensor, and judges the frosting situation on the fan by comparing the rotational speed of the fan with the preset threshold value, and the judgment is relatively accurate and intuitive.

Description of drawings

Fig. 1 is a schematic structural diagram of a fan in the present invention.

Fig. 2 is a schematic structural view of a fan body of the fan shown in Fig. 1 .

FIG. 3 is an exploded schematic diagram of FIG. 2 .

FIG. 4 is a structural schematic view of another angle of FIG. 2 .

Fig. 5 is a sectional view along the direction A-A in Fig. 4 .

FIG. 6 is a schematic structural view of the fan shown in FIG. 1 without a fan body.

Fig. 7 is a flow chart of the control method of the present invention.

detailed description

The present invention will be described in detail below in conjunction with various embodiments shown in the accompanying drawings. Please refer to FIG. 1 to FIG. 7 , which are preferred embodiments of the present invention.

Please refer to FIG. 1 to FIG. 7 , the accompanying drawings of the specification of the present invention only show the structural schematic diagram of the fan 1 and the heating assembly 2 provided on the fan 1 .

The present invention provides a refrigerator, comprising at least one storage compartment, a refrigeration system for providing cooling capacity to the storage compartment, a fan 1 for transporting cooling capacity to at least one storage compartment, and a fan 1 for supplying the cooling capacity to the storage compartment. 1 The heating assembly 2 that provides heat, the speed sensor installed on the fan 1 to sense the speed of the fan 1, the control system for controlling the operation of the refrigerator, the temperature control device with several temperature levels, and the A temperature sensor in the storage compartment. The refrigeration system, fan 1, heating assembly 2, speed sensor, temperature control device and temperature sensor are all electrically connected to the control system.

The refrigerating system is a compression refrigerating cycle system, comprising a compressor, a condenser, a throttling element and an evaporator connected in sequence, and the outlet of the evaporator is connected with the inlet of the compressor.

The temperature in the storage compartment is set by adjusting the temperature control device to select a temperature gear, and the selection of the temperature gear can be determined according to the requirements of the items stored in the storage compartment.

Each of the temperature levels has a corresponding start point and a shutdown point, the startup point is the temperature for starting the compressor, and the shutdown point is the temperature for stopping the compressor.

The control system obtains the real-time temperature T ₁ in the storage compartment measured by the temperature sensor, and compares the real-time temperature T ₁ with the size of the start-up point and the power-off point corresponding to the selected temperature gear to control the refrigeration system. That is, after a temperature gear is selected, when the real-time temperature T1 is higher _than the starting point corresponding to the temperature gear, the control system controls the start-up of the refrigeration system; when the real-time temperature T1 is lower _than the temperature After the shutdown point corresponding to the gear position, the control system controls the refrigeration system to shut down.

The fan 1 includes a fan body 11, a fan frame 12 for fixing the fan body 11, a stator 13, a rotating shaft 14 located in the middle of the stator 13 to drive the fan body 11 to rotate, and electrically connected to the stator 13 The PCB circuit board 15 and the fixing parts for fixing the fan frame 12 in the refrigerator.

The fixing member may be a buckle or a bolt or other structures. After the fan frame 12 is fixed in the refrigerator, the fan 1 is fixed in the refrigerator.

The PCB circuit board 15 is fixed in the middle of the fan frame 12 and is electrically connected with the control system.

The fan body 11 includes a support 111 , a plurality of fan blades 112 disposed on the support 111 , and a first conductive ring 113 and a second conductive ring 114 fixed inside the support 111 and having a conductive function.

Specifically, the support 111 includes a circular first wall 1112, a first annular wall 1113 fixed on the first wall 1112 and extending in a direction perpendicular to the plane where the first wall 1112 is located. and the second annular wall 1114 .

An opening matching the rotating shaft 14 is provided in the middle of the support 111 .

The first annular wall 1113 is located outside the second annular wall 1114 and the first annular wall 1113 is spaced apart from the second annular wall 1114; the first annular wall 1113, the second annular wall 1114 and The first wall 1112 surrounds and forms a receiving space for receiving the first conductor ring 113 and the second conductor ring 114 .

A partition 1115 is provided between the first annular wall 1113 and the second annular wall 1114. In this embodiment, the partition 1115 is a plurality of fixed columns 1115 arranged at intervals, and a plurality of fixed columns 1115 surround Form a ring shape. The fixing post 1115 protrudes from the first wall 1112 into the receiving space, and there are gaps between the fixing post 1115 and the first annular wall 1113 and the second annular wall 1114 .

Certainly, in other implementation manners, the partition 1115 may also be configured as an annular body located between the first annular wall 1113 and the second annular wall 1114 .

The first conductor loop 113 and the second conductor loop 114 are ring-shaped and arranged at intervals. In this embodiment, the first conductor loop 113 and the second conductor loop 114 are arranged concentrically. Certainly, in other implementation manners, the first conductor loop 113 and the second conductor loop 114 may also be arranged in other shapes.

The first conductor ring 113 is fixed on one side of the receiving space close to the first annular wall 1113, and is fastened in the gap formed between the fixing column 1115 and the first annular wall 1113, so that the The first conductor ring 113 and the support 111 perform synchronous rotation; correspondingly, the second conductor ring 114 is fixed on the side of the receiving space close to the second annular wall 1114, and is fastened to the In the gap formed by the fixing column 1115 and the second annular wall 1114 , the second conductor ring 114 and the support 111 move synchronously. After the first conductor loop 113 and the second conductor loop 114 are fixed in the receiving space, the fixing column 1115 makes the gap between the first conductor loop 113 and the second conductor loop 114 insulation state.

Along the extension direction of the rotating shaft 14, the width of the first conductor loop 113 is smaller than the width of the second conductor loop 114, and the first conductor loop 113 and the second conductor loop 114 are fixed on the After entering the receiving space, at least one end of the second conductor ring 114 protrudes to the outside of the first conductor ring 113 .

The heating assembly 2 includes a heating element 21 arranged on each of the fan blades 112, two ends of each heating element 21 are respectively connected to the first conductor ring 113 and the second conductor ring 114. The wire 22 and the two brushes are respectively in contact with the first conductor ring 113 and the second conductor ring 114 .

The first annular wall 1113 is provided with a through hole 1111 for the wire 22 to pass through the first annular wall 1113 to connect to the first conductor ring 113 and the second conductor ring 114 .

Specifically, when the separator 1115 is a plurality of fixed columns 1115 arranged at intervals, one end of the wire 22 connected to the second conductor ring 114 passing through the through hole 1111 can be directly connected to the second conductor The ring 114 protrudes from the part of the first conductor ring 113; when the separator 1115 is an annular body, the separator 1115 must also be provided with a wire for connecting to the second conductor ring 114 22 through the opening, the wire 22 passes through the through hole 1111 and the opening in sequence to be connected to the part of the second conductor ring 114 protruding from the first conductor ring 113 .

In this embodiment, the heating element 21 is a heating wire.

One of the two brushes is electrically connected to the GND terminal 151 on the PCB circuit board 15 , and the other is electrically connected to the 12V terminal 152 on the PCB circuit board 15 .

After the fan body 11 is installed on the fan frame 12, the end of the support 111 away from the first wall 1112 is set close to the PCB circuit board 15, so that the two brushes One is provided on the first conductor loop 113 on a side close to the second conductor loop 114 , and the other is provided on the second conductor loop 114 on a side close to the first conductor loop 113 . When the fan 1 rotates, the first conductor ring 113 and the second conductor ring 114 rotate, and the two brushes remain stationary, that is, the two brushes respectively move along the first conductor ring 113 , The second conductor ring 114 slides.

When it is necessary to start the heating assembly 2, the control system supplies power to the two brushes, and the two brushes transfer electricity to the two brushes through the conduction of the first conductor ring 113 and the second conductor ring 114. The wires 22 connected to the two ends of the heating element 21 are used to provide electricity to the heating element 21 so that the heating element 21 generates heat to provide heat to the fan blades 12 to remove the frost on the fan 1 .

When the fan 1 is frosted, it will affect the speed of the fan 1. Generally speaking, the greater the amount of frost on the fan 1, the lower the speed of the fan 1, so it can be based on the speed of the fan 1. The amount of frost on the fan 1 is judged by the magnitude of the rotating speed.

The control system receives the rotational speed of the fan 1 measured by the rotational speed sensor, and at the same time, a preset threshold value for comparison with the rotational speed of the fan 1 is set in the control system, and the threshold value is at the The corresponding rotational speed of the fan 1 when the cooling effect is affected by frost on the fan 1.

The control system determines whether to defrost the blower 1 by comparing the rotational speed with the threshold value. Specifically, when the rotational speed is greater than or equal to the threshold, it means that there is no frost or less frost on the fan 1, and defrosting is not required; when the rotational speed is less than the threshold, it means that the fan 1 is The amount of frost on the machine is relatively large and needs to be defrosted.

As shown in Figure 7, the control method for the aforementioned refrigerator in the present invention includes:

A starting method for determining whether to start the refrigeration system after the refrigerator is powered on;

Before starting the refrigeration system, a determination method for determining whether it is necessary to remove the frost on the fan 1;

A defrosting method for removing frost on the fan 1;

A shutdown method for judging whether to stop the refrigeration system.

The starting method includes the steps of:

S11: Determine whether the user has changed the temperature gear, if yes, control the refrigeration system according to the changed temperature gear and jump to step S12, if not, directly jump to step S12;

S12: Obtain the real-time temperature T ₁ of the storage compartment, and judge whether the real-time temperature T ₁ has reached the start-up point, if yes, start the refrigeration system, and run the judgment method first, if not, Then jump to the above step S11.

Of course, in a refrigerator without a temperature control device with several temperature levels, the start-up method only includes step S12, that is, directly by obtaining the real-time temperature T1 _of the storage compartment, and judging the real _- time temperature T1 Whether the starting point is reached to judge whether to start the refrigeration system.

The determination method includes the following steps:

S21: start the fan 1;

S22: Collect the rotational speed of the fan 1;

S23: Determine whether the rotational speed is greater than or equal to a preset threshold; if yes, defrosting is not required, that is, the refrigeration system can be started; if not, defrosting is required, stop the fan 1 and run the defrosting method.

Described defrosting method comprises the steps:

S31: Start the heating component 2;

S32: Judging whether the heating time of the heating component 2 is greater than or equal to the preset heating time N ₁ min; if yes, defrosting has been completed, stop the heating component 2; if not, continue to run the heating component2.

The heating time N1 is the time it takes to completely remove the frost on the fan ₁ .

In this embodiment, the heating time N1 in the above step S32 is set to ₁₀ minutes, that is, after the heating component heats the fan blade 112 for 10 minutes, the frost on the fan blade 112 can be removed.

After defrosting is completed, there is still a small amount of defrosting water remaining on the fan blades 112. At this time, if the refrigeration system is turned on immediately, the temperature of the evaporator will continue to decrease, which will make the residual defrosting water on the fan blades 112 The water quickly condenses into frost, so the present invention sets step S33 after the defrosting is completed.

S33: After stopping the heating component 2, start the fan 1 to run for a preset running time of N ₂ min; the refrigeration system can be started after the fan 1 runs for N ₂ min.

The running time N ₂ is the time required to completely remove the remaining defrosting water on the fan blades 112 .

The running time _N2 in the above step S33 is set to 1 min, that is, after starting the fan 1 to run for 1 min, the defrosting water remaining on the fan blades 112 will be thrown out under the action of centrifugal force.

The shutdown method is run after the refrigeration system is activated to provide cooling to the storage compartment.

Described shutdown method comprises the steps:

S41: Obtain the real-time temperature T ₁ of the storage compartment, and jump to the step S42;

S42: Judging whether the real _- time temperature T1 reaches the shutdown point; if yes, stop the refrigeration system; if not, continue to run the refrigeration system and go to step S41.

After the refrigeration system is stopped in the above step S42, jump to the step S11 or S12 to enter the next working cycle.

In summary, the present invention sets a speed sensor to sense the speed of the fan 1, and judges whether it is necessary to remove the frost on the fan 1 by comparing the speed of the fan 1 with the threshold value, which is more accurate and Intuitive; at the same time, each fan blade 112 is provided with a heating element 21, which can automatically remove the frost on the fan 1, so as not to affect the cooling effect of the refrigerator, and at the same time, the defrosting efficiency can be enhanced.

It should be understood that although this description is described according to implementation modes, not each implementation mode only contains an independent technical solution, and this description in the description is only for clarity, and those skilled in the art should take the description as a whole, and each The technical solutions in the embodiments can also be properly combined to form other embodiments that can be understood by those skilled in the art.

The series of detailed descriptions listed above are only specific descriptions for feasible implementations of the present invention, and they are not intended to limit the protection scope of the present invention. Any equivalent implementation or implementation that does not depart from the technical spirit of the present invention All changes should be included within the protection scope of the present invention.

Claims (10)

1. A refrigerator, comprising a storage compartment, a refrigeration system for providing cooling capacity to the storage compartment, a fan for delivering the cooling capacity to the storage compartment, and a control system for controlling the operation of the refrigerator, the Both the refrigeration system and the fan are electrically connected to the control system, and it is characterized in that: the refrigerator also includes a speed sensor arranged on the fan to measure the speed of the fan, and the speed sensor is connected to the fan The control system is electrically connected; the control system is set with a preset threshold for comparison with the fan speed. 2. The refrigerator according to claim 1, wherein the fan comprises a support, a plurality of fan blades arranged on the support, and a ring-shaped first conductor ring fixed inside the support and a second conductor ring, the first conductor ring is spaced apart from the second conductor ring; the refrigerator also includes a heating assembly for providing heat to the fan, and the heating assembly includes a The heating elements on the heating element, the two ends of each heating element are respectively connected to the wires on the first conductor ring and the second conductor ring, and the two wires in contact with the first conductor ring and the second conductor ring respectively two brushes, and two of the brushes are electrically connected to the control system. 3. The refrigerator according to claim 2, wherein the support comprises a first wall, a first wall fixed on the first wall and extending in a direction perpendicular to the plane where the first wall is located. An annular wall and a second annular wall; the first annular wall is located outside the second annular wall, and the first annular wall, the second annular wall, and the first wall surround and form accommodating the first conductor ring and The accommodation space of the second conductor ring. 4. The refrigerator according to claim 3, wherein the first conductor ring is fixed on a side of the receiving space close to the first annular wall, and the second conductor ring is fixed on the receiving space. One side of the space close to the second annular wall; along the extension direction of the rotating shaft of the fan, the width of the first conductor loop is smaller than the width of the second conductor loop. 5. A control method for controlling the refrigerator according to claim 1, characterized in that: the control method includes a method for judging whether it is necessary to remove the frost on the fan, and the method for judging includes the following steps: starting Before the refrigeration system, start the fan, collect the speed of the fan, and judge whether the speed is greater than or equal to a preset threshold; if yes, the refrigeration system can be started without defrosting; if If not, defrosting is required, stop the fan. 6. The control method according to claim 5, characterized in that: the refrigerator includes a heating assembly for providing heat to the fan; the control method also includes a defrosting method for removing the frost on the fan, the The defrosting method includes the following steps: when defrosting is required, after stopping the fan, start the heating assembly, and judge whether the heating time of the heating assembly is greater than or equal to the preset heating time N ₁ min; if it is , then stop the heating component; if not, continue to run the heating component. 7. The control method according to claim 6, characterized in that: the defrosting method further comprises the following steps: after stopping the heating assembly, start the fan to run for a preset running time N ₂ min; The refrigeration system can be started after the fan runs for N ₂ min. 8. The control method according to claim 5, characterized in that: the control method further comprises a starting method for determining whether to start the refrigeration system, and the starting method comprises the following steps: obtaining real-time data of the storage compartment temperature T ₁ , judging whether the real-time temperature T ₁ has reached the start-up point, and if so, the refrigeration system needs to be started. 9. The control method according to claim 8, characterized in that: the refrigerator further includes a temperature control device with several temperature levels; the starting method further includes the following steps: Before the temperature _T1 , it is judged whether the user changes the temperature gear, and if yes, the refrigeration system is controlled according to the changed temperature gear. 10. The control method according to claim 5 or 7, characterized in that: the control method also includes a shutdown method for determining whether to stop the refrigeration system after starting the refrigeration system, and the shutdown method includes the following steps: Acquiring the real-time temperature T ₁ of the storage compartment, and judging whether the real-time temperature T ₁ has reached a shutdown point; if yes, stopping the refrigeration system; if not, continuing to run the refrigeration system.