Winding coil, motor, electric air door and refrigerator

Abstract

The utility model relates to a winding coil, a motor, an electric air door and a refrigerator, and the winding coil comprises a first coil and a second coil. Wherein the first end of the first coil and the second end of the second coil are connected with a first power supply, and the winding direction of the first coil is opposite to that of the second coil; the second end of the first coil and the first end of the second coil are alternately conducted to a second power supply through a first switch module, and the polarity of the second power supply is opposite to that of the first power supply. According to the invention, the problem of high cost of a circuit for realizing the change of the magnetic flux direction by the winding coil is solved.

Description

Technical Field

[0001] The present application relates to the field of motor circuits, and particularly to winding coils, motors, electric air dampers, and refrigerators. Background Art

[0002] Currently, for motors, there is often a need to change the rotation direction of the motor. In traditional technologies, in order to change the rotation direction of the motor, a bridge bipolar control circuit composed of multiple four MOS transistors needs to be respectively connected to each phase winding in the motor. In each group of bridge bipolar control circuits, four switching transistors form a bridge structure, and a positive voltage or a negative voltage is output to change the magnetic flux direction of the magnetic field of each phase winding, thereby changing the operation direction. However, the bridge bipolar control circuit is relatively complex. Taking a two-phase stepper motor as an example, a total of eight MOS transistors are required to change the coil magnetic flux direction, resulting in a problem of high cost of the winding coil circuit.

[0003] Currently, for the problem of high cost of the circuit for realizing the change of the magnetic flux direction in the winding coil in the related art, no effective solution has been proposed yet. Utility Model Content

[0004] Embodiments of the present application provide a winding coil, a motor, an electric air damper, and a refrigerator to at least solve the problem of high cost of the circuit for realizing the change of the magnetic flux direction in the winding coil in the related art.

[0005] In a first aspect, an embodiment of the present application provides a winding coil, including: a first coil and a second coil; wherein,

[0006] The first end of the first coil and the second end of the second coil are connected to a first power supply, and the winding direction of the first coil is opposite to that of the second coil;

[0007] The second end of the first coil and the first end of the second coil are alternately conducted to a second power supply through a first switch module, and the second power supply has a polarity opposite to that of the first power supply.

[0008] In some embodiments, the first switch module includes a first switch unit and a second switch unit. The first switch unit is respectively connected to the second end of the first coil and the second power supply, and the second switch unit is respectively connected to the first end of the second coil and the second power supply.

[0009] In some embodiments, the winding coil further includes: a signal output module, and the signal output module is connected to the first switch unit and the second switch unit; wherein,

[0010] The signal output module is configured to output a periodic signal to the first switch unit and the second switch unit.

[0011] In some of these embodiments, the first switching unit is a MOS transistor. The gate of the MOS transistor is connected to the signal output module. The drain of the MOS transistor is connected to the second end of the first coil, and the source of the MOS transistor is grounded.

[0012] In a second aspect, an embodiment of the present application provides a motor, which includes a stator and a rotor; wherein,

[0013] The stator includes a first winding. The first end of the first coil and the second end of the second coil in the first winding are connected to a first power supply. The second end of the first coil and the first end of the second coil are alternately conducted to a second power supply through a second switching module. The winding direction of the first coil is opposite to that of the second coil, and the second power supply has a polarity opposite to that of the first power supply.

[0014] In some of these embodiments, the stator further includes a second winding, and the second winding includes a third coil and a fourth coil; wherein,

[0015] The first end of the third coil and the second end of the fourth coil are connected to the first power supply. The second end of the first coil and the first end of the second coil are alternately conducted to the second power supply through the second switching module. The winding direction of the third coil is opposite to that of the fourth coil.

[0016] In some of these embodiments, the first power supply is a positive power supply, and the second power supply is a negative power supply.

[0017] In a third aspect, an embodiment of the present application provides an electric air door, which includes a door panel, the motor described in the second aspect above, and a transmission device. The door panel is connected to the motor through the transmission device.

[0018] In some of these embodiments, the electric air door further includes a rotating shaft, the rotating shaft is connected to the transmission device, and the door panel swings around the rotating shaft.

[0019] In a fourth aspect, an embodiment of the present application provides a refrigerator, which includes the electric air door described in the third aspect above.

[0020] Compared with the related art, the winding coil, motor, electric air door, and refrigerator provided by the embodiments of the present application change the connection relationship between the two coils in the winding and the first power supply and the second power supply, achieving the effect that the magnetic flux directions of the two double-wire windings change with time, solving the problem of high circuit cost for the winding coil to achieve the change of the magnetic flux direction, and having a low circuit cost.

[0021] Details of one or more embodiments of the present application are set forth in the following drawings and description to make other features, objects, and advantages of the present application more concise and understandable. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings described herein are used to provide a further understanding of the present application and form a part of the present application. The schematic embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation of the present application. In the drawings:

[0023] Figure 1 is a structural block diagram of a winding coil in one embodiment;

[0024] Figure 2 is a structural block diagram of a motor in one embodiment;

[0025] Figure 3 is a schematic structural diagram of a stator in one embodiment;

[0026] Figure 4 is a structural block diagram of a motor in another embodiment;

[0027] Figure 5 is a schematic structural diagram of a motor winding in one embodiment;

[0028] Figure 6 is a schematic structural diagram of an electric air damper in one embodiment;

[0029] Figure 7 is a structural block diagram of a refrigerator in one embodiment.

[0030] Reference numerals: 1000, refrigerator; 100, electric air damper; 110, motor; 101, stator; 102, rotor; 120, transmission device; 130, door panel; 10, first winding; 11, first coil; 12, second coil; 13, first switch module; 20, first power supply; 30, second power supply; 40, second winding; 41, third coil; 42, fourth coil; 43, second switch module; A, second end of the first coil; -A, first end of the second coil; B, second end of the third coil; -B, first end of the fourth coil. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0031] In order to make the objectives, technical solutions and advantages of the present application more clear and understandable, the present application will be described and explained below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments provided in the present application without making creative efforts belong to the scope of protection of the present application. In addition, it can also be understood that although the efforts made in this development process may be complex and lengthy, for those of ordinary skill in the art related to the content disclosed in the present application, some design, manufacturing or production changes based on the technical content disclosed in the present application are only conventional technical means and should not be understood as insufficient disclosure of the content of the present application.

[0032] In this application, the mention of "embodiment" means that the specific features, structures or characteristics described in connection with the embodiment may be included in at least one embodiment of the present application. The phrase appears in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those of ordinary skill in the art explicitly and implicitly understand that the embodiments described in the present application may be combined with other embodiments without conflict.

[0033] Unless otherwise defined, the technical terms or scientific terms involved in the present application shall have the ordinary meaning understood by those of ordinary skill in the technical field to which the present application belongs. The terms "a", "one", "kind", "the" and other similar words involved in the present application do not indicate a quantity limitation and may represent a single or plural number. The terms "including", "comprising", "having" and any variations thereof involved in the present application are intended to cover non-exclusive inclusion; for example, a process, method, system, product or device including a series of steps or modules (units) is not limited to the listed steps or units, but may further include unlisted steps or units, or may further include other steps or units inherent to these processes, methods, products or devices. The terms "connected", "coupled" and other similar words involved in the present application are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The "plurality" involved in the present application means greater than or equal to two. "And / or" describes the association relationship of associated objects and indicates that three relationships may exist. For example, "A and / or B" may represent: A exists alone, A and B exist simultaneously, and B exists alone. The terms "first", "second", "third" and other terms involved in the present application are only used to distinguish similar objects and do not represent a specific order for the objects.

[0034] In one embodiment, Figure 1 a structural block diagram of a winding coil is provided, as Figure 1As shown, COM is the common terminal between the first end of the first coil 11 and the second end of the second coil 12. The winding coil includes: the first coil 11 and the second coil 12. Among them, the first end of the first coil 11 and the second end of the second coil 12 are connected to the first power supply 20, and the winding direction of the first coil 11 is opposite to that of the second coil 12. The second end A of the first coil 11 and the first end -A of the second coil 12 are alternately conducted to the second power supply 30 through the first switch module 13, and the second power supply 30 has the opposite polarity to the first power supply 20.

[0035] Among them, the first coil 11 and the second coil 12 form a two-wire winding. The first coil 11 and the second coil 12 can adopt winding materials with good conductivity and high mechanical strength, such as: wires containing copper, wires containing aluminum, etc.

[0036] Optionally, by setting the polarities of the first power supply 20 and the second power supply 30 to be opposite, when the first power supply 20 and the second power supply 30 are both connected to the first coil 11, the current flows from the first end of the first coil 11 into the second end A of the first coil 11; when the first power supply 20 and the second power supply 30 both supply power to the second coil 12, the current flows from the second end of the second coil 12 into the first end -A of the second coil 12. Among them, there is no structural difference between the first end and the second end of the first coil 11. Based on application requirements, on the basis that the second power supply 30 has the opposite polarity to the first power supply 20, the polarities of the first power supply 20 and the second power supply 30 can also be adjusted to change the current flow direction.

[0037] Among them, the first switch module 13 can be a device with circuit on-off functions such as a mechanical switch, a relay, a contactor, etc. Optionally, the first switch module 13 can be a multi-way switch. One end of the switch is connected to the second power supply 30; the other end of the switch can be connected to the second end A of the first coil 11 or the first end -A of the second coil 12. The connection state of the multi-way switch can be changed manually, so as to change the connection object of the second power supply 30 and convert the magnetic flux direction in the winding coil. Or, the first switch module 13 can also be a device such as a relay or a contactor that changes its own connection state in response to a signal input. When different level signals are input to the first switch module 13, the connection object of the second power supply 30 is different, and thus the magnetic flux direction in the winding coil is converted.

[0038] In this embodiment, a winding is obtained by using a double-wire winding method. After the first coil 11 and the second coil 12 are set as two coils with opposite winding directions, only by the first switch module 13 capable of realizing alternating conduction, the change in the magnetic flux direction of the winding coil can be achieved. Compared with the traditional method of using a bridge circuit to control a single-wire winding, the circuit structure is simple and the implementation cost is low, thus solving the problem of high circuit cost for realizing the change in the magnetic flux direction of the winding coil.

[0039] In some of these embodiments, the first switch module 13 includes a first switch unit and a second switch unit. The first switch unit is respectively connected to the second end A of the first coil 11 and the second power supply 30, and the second switch unit is respectively connected to the first end -A of the second coil 12 and the second power supply 30.

[0040] Among them, the first switch unit and the second switch unit can be a relay, a transistor, a toggle switch, etc. When the first switch unit is in the on state and the second switch unit is off, the second end A of the first coil 11 is connected to the second power supply 30, and the current flows through the first coil 11, and the winding coil generates magnetic flux in the first direction. When the second switch unit is in the on state and the first switch unit is off, the first end -A of the second coil 12 is connected to the second power supply 30, and the current flows through the second coil 12, and the winding coil generates magnetic flux in the direction opposite to the first direction. When the first switch unit and the second switch unit are both off, the winding coil does not generate magnetic flux.

[0041] In this embodiment, the connection states of the first coil 11, the second coil 12 and the second power supply 30 are respectively controlled by two switch units, so that the user can change the magnetic flux direction of the winding coil based on requirements.

[0042] Further, in some of these embodiments, the first switch unit is a MOS transistor. The gate of the MOS transistor is connected to the signal output module, the drain of the MOS transistor is connected to the second end A of the first coil 11, and the source of the MOS transistor is grounded. Among them, when the signal output module inputs a high level to the first switch unit, the first switch unit is turned on, and the second end A of the first coil 11 is connected to the second power supply 30; when the signal output module inputs a low level to the first switch unit, the first switch unit is turned off, and the second end A of the first coil 11 is not connected to the second power supply 30.

[0043] Based on the same principle, the second switch unit can also be a MOS transistor. The gate of the MOS transistor is connected to the signal output module, the drain of the MOS transistor is connected to the first end -A of the second coil 12, and the source of the MOS transistor is grounded, which will not be elaborated here. In this embodiment, using the MOS transistor as the first switch unit to connect the first coil 11 and the second power supply 30 can achieve the effect of reducing costs.

[0044] Further, in some embodiments, the winding coil further includes: a signal output module, the signal output module is connected to the first switch unit and the second switch unit; wherein, the signal output module is used to output a periodic signal to the first switch unit and the second switch unit.

[0045] Among them, the periodic signal can be a continuous square wave signal, a rectangular wave signal or a pulse signal with a 90° phase difference, etc., which can alternately output high and low levels. Optionally, the signal output module includes two output terminals. When one output terminal inputs a low-level signal to the first switch unit, the other output terminal inputs a high-level signal to the second switch unit; or, when one output terminal inputs a high-level signal to the first switch unit, the other output terminal inputs a low-level signal to the second switch unit. In this embodiment, by outputting a periodic signal to the first switch unit and the second switch unit, the magnetic flux of the winding coil can be periodically changed.

[0046] It can be understood that if the periodic inversion of the magnetic flux is not required, the signal output module can also output a continuous low-level signal and a high-level signal to the first switch unit and the second switch unit respectively; and when it is necessary to change the direction of the magnetic flux, the user can adjust the level of the output signal.

[0047] Based on the same inventive concept, the embodiments of the present application also provide a motor 110 involving the above-mentioned winding coil. In this embodiment, the solution for solving the problem provided by the motor 110 is similar to the solution described in the above-mentioned winding coil embodiment. Therefore, the specific limitations in one or more of the following motor 110 embodiments can refer to the limitations on the winding coil method in the above text, and will not be repeated here.

[0048] In one embodiment, Figure 2 A structural block diagram of a motor 110 is provided, as Figure 2 shown, the motor 110 includes a stator 101 and a rotor 102; wherein, the stator 101 includes a first winding 10, the first end of the first coil 11 and the second end of the second coil 12 in the first winding 10 are connected to a first power supply 20, the second end A of the first coil 11 and the first end -A of the second coil 12 are alternately conducted to a second power supply 30 through a second switch module 43, the winding direction of the first coil 11 is opposite to that of the second coil 12, and the second power supply 30 is opposite in polarity to the first power supply 20.

[0049] Among them, the rotor 102 is the rotating part of the motor 110; the stator 101 is the stationary part of the motor 110. Optionally, Figure 3 is a schematic structural diagram of the stator 101 in this embodiment, as Figure 3As shown, the first end of the first coil 11 and the second end of the second coil 12 in the first winding 10 of the stator 101 are connected as the common terminal COM. Figure 3 The structure of the motor 110 shown can be applied to a single-phase motor 110.

[0050] Among them, when the second end A of the first coil 11 is connected to the second power supply 30 through the second switch module 43, and the first end -A of the second coil 12 is connected to the second power supply 30 through the second switch module 43, the rotation direction of the rotor 102 of the motor 110 is opposite.

[0051] Furthermore, in some embodiments, the first power supply 20 is a positive power supply and the second power supply 30 is a negative power supply. Taking Figure 3 the stator 101 shown as an example, when the common terminal COM is connected to the first power supply 20 and the second end A of the first coil 11 is connected to the second power supply 30, assuming that the magnetic flux density direction in the winding is inward perpendicular to the winding plane at this time; then, when the common terminal COM is connected to the first power supply 20 and the first end -A of the second coil 12 is connected to the second power supply 30, the magnetic flux density in the winding is also opposite, that is, outward perpendicular to the winding plane, thus realizing the change of the winding magnetic flux direction.

[0052] In some embodiments, Figure 4 is a structural block diagram of the motor 110 in another embodiment. As Figure 4 shown, in addition to the first winding 10, the stator 101 further includes a second winding 40. The second winding 40 includes a third coil 41 and a fourth coil 42; among them, the first end of the third coil 41 and the second end of the fourth coil 42 are connected to the first power supply 20, and the second end A of the first coil 11 and the first end -A of the second coil 12 are alternately conducted to the second power supply 30 through the second switch module 43. The winding direction of the third coil 41 is opposite to that of the fourth coil 42. Among them, Figure 4 the structure of the motor 110 shown can be applied to a two-phase motor 110. The second winding 40 and the first winding 10 cooperate together to enable the rotor 102 of the motor 110 to rotate. The winding direction of the third coil 41 can be the same as that of the first coil 11 or the same as that of the second coil 12, which is not limited herein.

[0053] The embodiments of the present application will be described and illustrated below through preferred embodiments. Figure 5 is a schematic structural diagram of the winding of the motor 110 in another embodiment. As Figure 5 shown, the winding direction of the first coil 11 is the same as that of the third coil 41, the winding direction of the second coil 12 is the same as that of the fourth coil 42, and the winding direction of the first coil 11 is opposite to that of the second coil 12. The first power supply 20 is +12V.

[0054] Optionally, Figure 5 Select a two-phase stepper motor 110: Each phase winding in the motor 110 is wound with two wires. After winding, the head end of the first winding 10, that is, the first coil 11 in the first winding of the motor 110, is used as the second end, and the tail end of the first coil 11 is used as the first end. The head end of the second coil 12 is used as the first end, and the tail end of the second coil 12 is used as the second end. The tail end of the first coil 11 is connected to the head end of the second coil 12 of this phase winding as the common terminal COM and connected to the +12V power supply; the second end A of the first coil 11 and the first end -A of the second coil 12 are respectively connected to two MOS transistors.

[0055] For the second winding 40, that is, the head end of the third coil 41 in the second phase winding of the motor 110 is used as the second end, and the tail end of the fourth coil 42 is used as the first end. The head end of the third coil 41 is used as the first end, and the tail end of the fourth coil 42 is used as the second end. The tail end of the third coil 41 is connected to the head end of the fourth coil 42 of this phase winding as the common terminal COM and connected to the +12V power supply; the second end B of the third coil 41 and the first end -B of the fourth coil 42 are respectively connected to two other MOS transistors.

[0056] The four MOS transistors adjust and change their on-off states based on the input electrical signals. Among them, the input signal can be controlled manually or by external devices such as chips and microprocessors. For example, it can be connected to an MCU (Microcontroller Unit), and the on-off of the circuit where the MOS is located is controlled by the MCU. The following table shows the connection sequence of each end of the winding and the electrical signal when the two-phase stepper motor 110 operates.

[0057] COM A -A B -B 1 Connect the positive power supply Connect the negative power supply Power off Connect the negative power supply Power off 2 Connect the positive power supply Connect the negative power supply Power off Power off Connect the negative power supply 3 Connect the positive power supply Power off Connect the negative power supply Power off Connect the negative power supply 4 Connect the positive power supply Power off Connect the negative power supply Connect the negative power supply Power off

[0058] Based on the same inventive concept, the embodiment of the present application also provides an electric air damper 100 related to the above motor 110. The implementation solution provided by the electric air damper 100 to solve the problem is similar to the implementation solution described in the above embodiment of the motor 110. Therefore, the specific limitations in one or more of the above embodiments of the motor 110 can be referred to the limitations on the winding coil method in the above text, and will not be repeated here.

[0059] Figure 6 is a schematic structural diagram of the electric air damper 100 in the embodiment of the present application. As Figure 6 shown, the electric air damper 100 includes a door panel 130, a motor 110, and a transmission device 120. The door panel 130 is connected to the motor 110 through the transmission device 120. Optionally, the moving direction of the door panel 130 in the electric air damper 100 changes with the rotation direction of the motor 110. Among them, the traditional device includes but is not limited to devices such as gears and chains.

[0060] In some of these embodiments, the electric air door 100 further includes a rotating shaft, which is connected to the transmission device 120, and the door panel 130 swings around the rotating shaft. Optionally, the transmission device 120 is a gearbox, and through the gearbox, the door panel 130 is conducted to swing around its rotating shaft, realizing the opening or closing of the electric air door 100 corresponding to the doorway.

[0061] Among them, the motor 110 in the electric air door 100 can be a single-phase motor 110. At this time, the stator 101 of the motor 110 only includes one winding. Exemplarily, the stator 101 includes a first winding 10. The first end of the first coil 11 and the second end of the second coil 12 in the first winding 10 are connected to the first power supply 20. The second end A of the first coil 11 and the first end -A of the second coil 12 are alternately conducted to the second power supply 30 through the second switch module 43. The winding direction of the first coil 11 is opposite to that of the second coil 12, and the second power supply 30 has the opposite polarity to the first power supply 20.

[0062] The motor 110 in the electric air door 100 can also be a two-phase motor 110. At this time, the stator 101 of the motor 110 includes two windings. Exemplarily, in addition to the above-mentioned first winding 10, the stator 101 further includes a second winding 40. The second winding 40 includes a third coil 41 and a fourth coil 42; among them, the first end of the third coil 41 and the second end of the fourth coil 42 are connected to the first power supply 20. The second end A of the first coil 11 and the first end -A of the second coil 12 are alternately conducted to the second power supply 30 through the second switch module 43. The winding direction of the third coil 41 is opposite to that of the fourth coil 42.

[0063] Based on the same inventive concept, the embodiment of the present application also provides a refrigerator 1000 involving the above-mentioned electric air door 100. Figure 7 This is the structural block diagram of the refrigerator 1000 in the embodiment of the present application, as Figure 7 shown, the refrigerator 1000 includes the electric air door 100 in the above embodiment. By opening and closing the electric air door 100, the variable temperature function of each area of the refrigerator 1000 is realized.

[0064] The solution provided by this refrigerator 1000 to solve the problem is similar to the solution described in the above embodiment of the electric air door 100. Therefore, the specific limitations in one or more of the following embodiments of the motor 110 can refer to the limitations on the winding coil method in the above text, and will not be repeated here.

[0065] Those skilled in the art should understand that the technical features of the above-mentioned embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as the combinations of these technical features do not conflict, they should all be considered to be within the scope described in this specification.

[0066] The above-described embodiments merely represent several implementation manners of the present application. The description thereof is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent of the present application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several variations and improvements can still be made, and these all fall within the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the appended claims.

Claims

1. A winding coil, characterized in that, Comprising: A first coil and a second coil; wherein, A first end of the first coil and a second end of the second coil are connected to a first power supply, and the winding direction of the first coil is opposite to that of the second coil; A second end of the first coil and a first end of the second coil are alternately conducted to a second power supply through a first switching module, and the second power supply has a polarity opposite to that of the first power supply.

2. The winding coil according to claim 1, wherein The first switching module includes a first switching unit and a second switching unit. The first switching unit is respectively connected to the second end of the first coil and the second power supply, and the second switching unit is respectively connected to the first end of the second coil and the second power supply.

3. The winding coil according to claim 2, wherein The winding coil further includes: a signal output module, and the signal output module is connected to the first switching unit and the second switching unit; wherein, The signal output module is used to output a periodic signal to the first switching unit and the second switching unit.

4. The winding coil according to claim 3, characterized in that, The first switching unit is a MOS transistor. The gate of the MOS transistor is connected to the signal output module, the drain of the MOS transistor is connected to the second end of the first coil, and the source of the MOS transistor is grounded.

5. A motor, characterized in that, The motor includes a stator and a rotor; wherein, The stator includes a first winding. A first end of the first coil and a second end of the second coil in the first winding are connected to a first power supply. A second end of the first coil and a first end of the second coil are alternately conducted to a second power supply through a second switching module. The winding direction of the first coil is opposite to that of the second coil, and the second power supply has a polarity opposite to that of the first power supply.

6. The motor according to claim 5, characterized in that, The stator further includes a second winding, and the second winding includes a third coil and a fourth coil; wherein, A first end of the third coil and a second end of the fourth coil are connected to the first power supply. A second end of the first coil and a first end of the second coil are alternately conducted to the second power supply through the second switching module. The winding direction of the third coil is opposite to that of the fourth coil.

7. The motor according to claim 5, characterized in that, The first power supply is a positive power supply, and the second power supply is a negative power supply.

8. An electric air damper, characterized in that, The electric air door includes a door panel, the motor according to any one of claims 5 to 7, and a transmission device. The door panel is connected to the motor through the transmission device.

9. The electric air damper according to claim 8, characterized in that, The electric air door further includes a rotating shaft, the rotating shaft is connected to the transmission device, and the door panel swings around the rotating shaft.

10. A refrigerator, characterized in that, The refrigerator includes the electric air door according to claim 8.

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