Refrigerator air damper capable of preventing icing, and electric motor control method for preventing icing of refrigerator air damper

Abstract

Provided are a refrigerator air damper capable of preventing icing, and an electric motor control method for preventing icing of a refrigerator air damper. An air damper driving electric motor (3) is configured to have a third mode. In the third mode, when an air damper through hole (2) is closed by an air damper blade (4), an output shaft of the air damper driving electric motor (3) drives the air damper blade (4) to repeatedly and slightly swing relative to the air damper through hole (2), thereby effectively preventing the air damper blade (4) and the air damper through hole (2) from freezing and sticking together due to the fact that water between the air damper blade (4) and the air damper through hole (2) is iced. Thus, the problem in the prior art of the air damper driving electric motor (3) being unable to drive the air damper blade (4) to open when there is a requirement to open the air damper through hole (2) is solved. Compared with the technical solution in the prior art of ensuring the normal opening of the air damper blade (4) by means of heating, the present invention is more energy-saving; a refrigeration compartment can supply cold air in a timely manner for fresh-keeping; and the service life of the air damper driving electric motor (3) is also prolonged.

Description

Anti-icing refrigerator damper and motor control method for preventing icing of refrigerator damper [TECHNICAL FIELD]

[0001] The present application relates to the technical field of refrigerator damper, and particularly relates to an anti-icing refrigerator damper and a motor control method for preventing icing of the refrigerator damper. [BACKGROUND]

[0002] Currently, the freezing chamber and the refrigerating chamber in a refrigerator share a set of refrigeration system, and how to allocate the cold air entering the two spaces is crucial, and the refrigerator damper plays a vital role. The refrigerator electric damper is a key component connecting the freezing chamber and the refrigerating chamber, and its main function is to control the flow of cold air. When the temperature of the refrigerating chamber needs to be adjusted, the electric damper blade will be opened or the opening and closing angle will be adjusted, so as to adjust the air volume of the cold air flowing from the freezing chamber into the refrigerating chamber to control the temperature thereof; when the refrigerating chamber reaches the set temperature, the electric damper will be automatically closed or stopped from rotating, so as to maintain the constant low-temperature state of the refrigerating chamber.

[0003] However, since the refrigerator electric control damper is directly in contact with the cold air, and the temperature of the freezing chamber is generally below-4 DEG C, and the refrigerator door is frequently opened and closed during use, air and water vapor will flow into the refrigerator, and due to the low frequency of the rotation of the damper shaft and the blade during use, frost and ice are formed at the closed part of the damper shaft or the blade, so that the motor cannot drive the damper shaft and the damper to normally open and close, and the damper fails.

[0004] Some existing refrigerators adopt the method of installing heating fins or heating coating around the closed damper, and preventing the frost and ice from being formed on the rotating part of the damper by electric control adjustment and opening of the electric heating mode, but there are problems of slow heating efficiency, low adjustment precision, and unstable temperature in the refrigerator during the heating process, and 6-7 lead wires need to be connected in the small-space damper structure, which causes the complex layout of the wire harness.

[0005] The present application is developed and proposed in view of the problems in the prior art. [SUMMARY]

[0006] The present application overcomes the deficiencies of the prior art, and provides a refrigerator damper capable of preventing icing, wherein the damper driving motor is configured to have a third mode, in which the damper driving motor output shaft drives the damper vane to repeatedly swing slightly relative to the damper through hole in the state that the damper vane closes the damper through hole, thereby effectively preventing the water between the damper vane and the damper through hole from being frozen and adhered to each other, solving the problem that the damper driving motor cannot drive the damper vane to open in the prior art when the damper through hole needs to be opened. The present application is different from the prior art technical solution that uses heating to ensure the damper vane to be normally opened, and therefore the present application is more energy-saving, effectively ensures the cold air to be supplied to the refrigerating chamber in time for preservation, and prolongs the service life of the damper driving motor.

[0007] To achieve the above-mentioned object, the present application provides a refrigerator damper capable of preventing icing, which comprises a damper connecting seat 1 and a damper driving motor 3, the damper connecting seat 1 is arranged between a freezing chamber and a refrigerating chamber and is provided with a damper through hole 2 capable of communicating between the freezing chamber and the refrigerating chamber, a damper vane 4 for covering the damper through hole 2 is rotatably connected to the damper connecting seat 1, the damper driving motor 3 is fixedly connected to the damper connecting seat 1, and the output shaft of the damper driving motor 3 is connected with the damper vane 4 to drive the damper vane 4 to rotate and open or close the damper through hole 2; the damper driving motor 3 is configured to have a first mode of driving the damper vane 4 to open the damper through hole 2 in the positive rotation mode, a second mode of driving the damper vane 4 to close the damper through hole 2 in the reverse rotation mode, and a third mode, in which the damper vane 4 closes the damper through hole 2, and the output shaft of the damper driving motor 3 drives the damper vane 4 to repeatedly swing slightly relative to the damper through hole 2 to prevent the damper vane 4 from being frozen and adhered to the damper through hole 2.

[0008] The damper driving motor 3 of the refrigerator damper capable of preventing icing as described above enters the third mode by the control signal sent by the upper computer electrically connected thereto.

[0009] The damper driving motor 3 of the refrigerator damper capable of preventing icing as described above comprises a motor body 31 and an integrated control board 32 arranged on the motor body 31 for driving and controlling the power output of the motor body 31, the integrated control board 32 is provided with a motor control chip 33, and the motor control chip 33 is configured to have a control signal for entering the third mode, in which the output shaft of the motor body 31 drives the damper vane 4 to repeatedly swing slightly relative to the damper through hole 2.

[0010] The motor control chip 33 is integrated with a motor logic operation driving unit 321, a pre-driving unit 322 and a full-bridge driving unit 323, the motor logic operation driving unit 321 is used for completing the micro-division algorithm of pulse and the generation of two-channel orthogonal SPWM wave pulses, the pre-driving unit 322 is used for completing the conversion of TTL level into the level of the gate of a drivable MOS tube, and the full-bridge driving unit 323 is used for converting the pulse signal into power output, so as to drive the motor body 31 to work by means of the subdivided modulation chord current output.

[0011] The motor body 31 is a two-phase claw pole type stepping motor, and the integrated control board 32 is connected with a three-wire structure motor connection terminal or three lead wires for external connection, the three-wire structure motor connection terminal or the three lead wires correspond to a signal end, a ground end and a voltage end respectively.

[0012] The door connecting seat 1 is provided with an isolation cavity 6 on one side, and the door driving motor 3 is fixedly arranged in the isolation cavity 6; the isolation cavity 6 is provided with a door rotating guide hole 11 on the side wall close to the door through hole 2, the door rotating guide hole 11 is rotatably connected with a same-motion connecting piece 13, one end of the same-motion connecting piece 13 is connected with the output shaft of the motor body 31 in a same-motion mode, and the other end of the same-motion connecting piece 13 is connected with the door blade 4 in a same-motion mode.

[0013] The opposite end of the door blade 4 connected with the same-motion connecting piece 13 is provided with an outer connecting ring sleeve 43, the outer connecting ring sleeve 13 is concentrically provided with a core shaft 431, the door connecting seat 1 is provided with an inner connecting ring sleeve 12 away from the door driving motor 3, the core shaft 431 is rotatably inserted into the inner connecting ring sleeve 12, and the outer connecting ring sleeve 13 is rotatably sleeved outside the inner connecting ring sleeve 12.

[0014] The circumferential edge of the door through hole 2 close to the door blade 4 is provided with an annular convex edge 5, the outer periphery of the annular convex edge 5 is provided with intermittent convex edges 51 in a spaced and biased mode, the adjacent two intermittent convex edges 51 form a drainage gap 52, the annular convex edge 5 and the intermittent convex edge 51 form a groove 53 for accommodating a gasket, the door blade 4 is formed with a recess cavity 41 close to the annular convex edge 7, and when the door blade 4 closes the door through hole 2, the annular convex edge 7 is arranged in the recess cavity 41.

[0015] The application further provides a motor control method for preventing the icing of a refrigerator door, characterized by adopting the refrigerator door capable of preventing icing according to the application, and comprising the following steps:

[0016] S1, judging whether the door blade 4 is in a closed state;

[0017] S2, when judging that the air door blade 4 is in the closed state, the host computer outputs a control signal, or the motor control chip 33 on the air door driving motor 3 outputs a control signal, and the motor body 31 outputs the shaft to drive the air door blade 4 to repeatedly swing slightly between the open state and the closed state relative to the air door through hole 2 to enter the third mode;

[0018] S3, when the third mode reaches the preset time, the host computer stops outputting the control signal to enter the third mode, or the motor control chip 33 on the air door driving motor 3 stops outputting the control signal to enter the third mode, and the host computer outputs a control signal to enter the second mode, or the motor control chip 33 on the air door driving motor 3 outputs a control signal to enter the second mode, so that the motor body 31 output shaft is reversed to drive the air door blade 4 to block the air door through hole 2;

[0019] S4, when the refrigerator refrigerating chamber needs to be supplemented with cold air, the host computer outputs a control signal to enter the first mode, or the motor control chip 33 on the air door driving motor 3 outputs a control signal to enter the first mode, so that the motor body 31 output shaft is reversed to drive the air door blade 4 to open the air door through hole 2;

[0020] S5, when the step S4 is completed, the host computer outputs a control signal to enter the second mode, or the motor control chip 33 on the air door driving motor 3 outputs a control signal to enter the second mode, so that the motor body 31 output shaft is reversed to drive the air door blade 4 to block the air door through hole 2;

[0021] S6, return to S1 and repeat the cycle.

[0022] The motor control method for preventing the air door of the refrigerator from icing up as described above, wherein in step S2, when judging that the air door blade 4 is in the closed state, the host computer outputs a control signal, or the motor control chip 33 on the air door driving motor 3 outputs a control signal, and the motor body 31 outputs the shaft to drive the air door blade 4 to repeatedly swing slightly between the open state and the closed state relative to the air door through hole 2 to enter the third mode.

[0023] Compared with the prior art, the present application has the following advantages:

[0024] 1. In the present application, when the air door blade is in the closed state, the air door driving motor enters the third mode, so that the air door blade swings slightly between the closed and open states relative to the air door through hole, thereby effectively preventing the water attached between the air door blade and the air door through hole from icing and freezing to bond the two, so that the air door blade has the characteristics of reliable and stable opening and closing.

[0025] 2、Avoid the problem of the motor of the damper being blocked by the frozen adhesion of the damper blade and the damper hole, and better protect the motor of the damper and prolong its service life.

[0026] 3、The motor of the damper of the present application is driven by modulating the chord wave current, and the rotation of the damper blade is more stable and silent.

[0027] 4、The motor body of the motor of the damper of the present application is a two-phase claw pole type stepping motor, and the motor control chip integrated with the motor logic operation driving unit, the pre-driving unit and the full-bridge driving unit is arranged on the integrated control board, so that the motor of the damper only needs 3 wires to be connected with the external, greatly saving the wiring cost of connecting the motor of the damper with the upper computer. [SUMMARY]

[0028] Fig. 1 is a structural schematic diagram of the refrigerator damper of the present application;

[0029] Fig. 2 is a structural schematic diagram of the refrigerator damper of the present application;

[0030] Fig. 3 is an exploded schematic diagram of the refrigerator damper of the present application;

[0031] Fig. 4 is an exploded schematic diagram of the refrigerator damper of the present application;

[0032] Fig. 5 is an exploded schematic diagram of the motor of the damper of the present application;

[0033] Fig. 6 is a control principle diagram of the motor of the damper of the present application;

[0034] Fig. 7 is a 2-2 phase excitation sequence diagram of the two-phase claw pole type stepping motor of the motor of the damper of the present application;

[0035] Fig. 8 is a current waveform schematic diagram of the two-phase claw pole type stepping motor of the motor of the damper of the present application;

[0036] Fig. 9 is a schematic diagram of the control circuit of the motor control chip of the present application connected with the motor of the damper. [DETAILED DESCRIPTION]

[0037] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings.

[0038] As shown in Figures 1-4, the present invention provides a refrigerator air vent that prevents icing, comprising an air vent connector 1 and an air vent drive motor 3. The air vent connector 1 is positioned between the freezer compartment and the refrigerator compartment and has an air vent through hole 2 connecting the two compartments. An air vent blade 4 for covering the air vent through hole 2 is rotatably connected to the air vent connector 1. The air vent drive motor 3 is fixedly connected to the air vent connector 1, and its output shaft is movably connected to the air vent blade 4 to drive the blade 4 to rotate, thereby opening or closing the air vent through hole 2. That is, when the refrigerator compartment temperature exceeds a preset temperature and additional cooling air is needed... When the damper blade 4 rotates, it opens the damper through hole 2. The damper drive motor 3 is configured with a first mode of forward rotation to drive the damper blade 4 to open the damper through hole 2 and a second mode of reverse rotation to drive the damper blade 4 to close the damper through hole 2. The damper drive motor 3 is also configured with a third mode, in which the output shaft of the damper drive motor 3 drives the damper blade 4 to repeatedly swing slightly relative to the damper through hole 2 when the damper blade 4 is closed. This effectively prevents the water adhering between the damper blade and the damper through hole from freezing and sticking together, so that the damper blade has reliable and stable opening and closing characteristics.

[0039] In one embodiment of the present invention, the damper drive motor 3 enters the third mode by receiving a control signal from a host computer electrically connected to it.

[0040] In another embodiment of the present invention, the damper drive motor 3 includes a motor body 31 and an integrated control board 32 disposed on the motor body 31 for driving and controlling the power output of the motor body 31. The integrated control board 32 is provided with a motor control chip 33. The motor control chip 33 is configured to have a control signal that controls the output shaft of the motor body 31 to drive the damper blade 4 to repeatedly swing slightly relative to the damper through hole 2 to enter the third mode.

[0041] Whether it is the first implementation method or the second implementation method, the main purpose is to embed a program that can drive the damper drive motor 3 into the third mode on the host computer or motor control chip 33. The main function of this program is to subdivide the number of steps of the output shaft of the damper drive motor and rotate it back and forth within a certain angle range, thereby obtaining the motion effect of the damper blade 4 repeatedly oscillating slightly relative to the damper through hole 2.

[0042] As shown in Figure 9, the motor control chip 33 integrates a motor logic operation drive unit 321, a pre-drive unit 322, and a full-bridge drive unit 323. The motor logic operation drive unit 321 is used to complete the pulse subdivision algorithm and generate orthogonal SPWM wave pulses in two channels. The pre-drive unit 322 is used to convert the TTL level to a level that can drive the gate of the MOS transistor. The full-bridge drive unit 323 is used to convert the pulse signal into power output, and drive the motor body 31 to work by subdividing and modulating the sine wave current output. As shown in Figures 7 and 8, the motor body 31 is driven by the subdivided and modulated sine wave current, making the rotation of the damper blades smoother and quieter.

[0043] As shown in Figures 5 and 6, the motor body 31 is a two-phase claw-pole stepper motor. The integrated control board 32 is connected to a three-wire motor connection terminal or three leads for external connection. The three-wire motor connection terminal or three leads correspond to the signal terminal, ground terminal, and voltage terminal, respectively. Therefore, by connecting the integrated control board with the motor control chip to the host computer via one signal terminal, one ground terminal, and one voltage terminal, the wiring between the refrigerator main control board and the integrated control board is simplified. That is, the connection between the two-phase claw-pole stepper motor and the integrated control board is simplified from five wires to a minimum of three wires, reducing wiring space, optimizing the structure, simplifying the manufacturing process, and reducing costs.

[0044] As shown in Figures 3 and 4, an isolation cavity 6 is provided on one side of the damper connecting seat 1, and the damper drive motor 3 is fixedly placed in the isolation cavity 6. The isolation cavity 6 is provided with a damper rotation guide hole 11 on the side wall near the damper through hole 2. A co-moving connector 13 is rotatably connected in the damper rotation guide hole 11. One end of the co-moving connector 13 is co-movingly connected to the output shaft of the motor body 31, and the other end of the co-moving connector 13 is co-movingly connected to the damper blade 4. Therefore, the co-moving connector 13 is reliably connected to the damper blade 4 and the output shaft of the motor body 31, and is easy to assemble.

[0045] As shown in Figure 3, an isolation cavity 6 is provided on one side of the damper connecting seat 1. The damper drive motor 3 is fixedly placed in the isolation cavity 6. A cover 61 is fastened to the opening of the isolation cavity. The cover 61 has fastening ears 63 with notches / holes on two opposite sides. Correspondingly, the outer wall of the isolation cavity 6 is provided with a fastening groove 62 with barbs. When the cover 61 is fastened to the opening of the isolation cavity 6, the fastening ears 63 are inserted into the fastening groove 62, and the barbs in the fastening groove 62 are then engaged in the notches / holes of the fastening ears 63. This structural design makes the outer side of the isolation cavity 6 flat and simple after the cover 61 is fastened to the opening of the isolation cavity 6, and the connection is stable and reliable.

[0046] As shown in Figures 3 and 4, in order to ensure that the damper blade 4 rotates smoothly and steadily, an outer connecting ring 43 is provided at the opposite end of the damper blade 4 and the co-moving connector 13. A spindle 431 is concentrically arranged inside the outer connecting ring 13. An inner connecting ring 12 is provided at the end of the damper connecting seat 1 away from the damper drive motor 3. The spindle 431 is rotatably inserted into the inner connecting ring 12, and the outer connecting ring 13 is rotatably sleeved on the outside of the inner connecting ring 12.

[0047] As shown in Figure 4, the circumferential edge of the damper through-hole 2 near the damper blade 4 is provided with an annular protrusion 5. Intermittent protrusions 51 are offset at intervals around the outer periphery of the annular protrusion 5, and a drainage notch 52 is formed between adjacent intermittent protrusions 51. A groove 53 for accommodating a gasket is formed between the annular protrusion 5 and the intermittent protrusions 51. This gasket is generally made of an elastic material, such as sponge. A cavity 41 is formed near the annular protrusion 7 on the damper blade 4. When the damper blade 4 closes the damper through-hole 2, the annular protrusion 7 is placed in the cavity 41. When the damper blade 4 closes, it compresses the gasket, causing deformation. Air and water in the gasket and groove are then expelled through the drainage notch 52, resulting in a tighter seal and ensuring better freezing and preservation effects.

[0048] The present invention provides a motor control method for preventing ice buildup on a refrigerator damper, which employs the aforementioned ice-preventing refrigerator damper and includes the following steps:

[0049] S1. Determine whether damper blade 4 is in the closed state;

[0050] S2. When it is determined that the damper blade 4 is in the closed state, and preferably when the damper blade 4 is just closed, the host computer outputs a control signal, or the motor control chip 33 on the damper drive motor 3 outputs a control signal, and the output shaft of the drive motor body 31 drives the damper blade 4 to repeatedly swing slightly between the open state and the closed state relative to the damper through hole 2 to enter the third mode; if the damper blade 4 is closed for a period of time before entering the third mode, in this case, the damper blade may have already been frozen and stuck to the damper through hole by the water between them. Therefore, it is preferable to start the third mode when the damper blade 4 is just closed.

[0051] S3. When the third mode reaches the preset time, the host computer stops outputting the control signal to enter the third mode, or the motor control chip 33 on the damper drive motor 3 stops outputting the control signal to enter the third mode, and the host computer outputs the control signal to enter the second mode, or the motor control chip 33 on the damper drive motor 3 outputs the control signal to enter the second mode, so that the output shaft of the motor body 31 reverses to drive the damper blade 4 to block the damper through hole 2.

[0052] S4. When the refrigerator compartment needs to be replenished with cold air, the host computer outputs a control signal to enter the first mode, or the motor control chip 33 on the damper drive motor 3 outputs a control signal to enter the first mode, so that the output shaft of the motor body 31 rotates in the forward direction to drive the damper blades 4 to open the damper through hole 2.

[0053] S5. When the cold air is replenished in step S4, the host computer outputs a control signal to enter the second mode, or the motor control chip 33 on the damper drive motor 3 outputs a control signal to enter the second mode, so that the output shaft of the motor body 31 reverses to drive the damper blade 4 to block the damper through hole 2.

[0054] S6, return to S1, and repeat the loop.

[0055] In summary, the present invention effectively prevents water adhering to the damper blades and damper through holes from freezing and sticking together, thus ensuring reliable and stable operation of the damper blades; it also effectively prevents the damper drive motor from freezing and sticking together between the damper blades and damper through holes, thus better protecting the damper drive motor and extending its service life; and it makes the damper blade rotation process smoother and quieter.

[0056] The above are merely preferred embodiments of the present invention and do not limit the patent scope of the present invention. All equivalent structural transformations made using the contents of the present invention's specification and drawings under the inventive concept of the present invention, or direct or indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A refrigerator door that prevents icing, characterized in that... The device includes a damper connector (1) and a damper drive motor (3). The damper connector (1) is placed between the freezer compartment and the refrigerator compartment and has a damper through hole (2) that connects the freezer compartment and the refrigerator compartment. A damper blade (4) for covering the damper through hole (2) is rotatably connected to the damper connector (1). The damper drive motor (3) is relatively fixedly connected to the damper connector (1), and the output shaft of the damper drive motor (3) is connected to the damper blade (4) to drive the damper blade (4) to rotate so as to open or close the damper through hole (2). The damper drive motor (3) is configured with a first mode in which forward rotation drives the damper blades (4) to open the damper through hole (2); and a second mode in which reverse rotation drives the damper blades (4) to close the damper through hole (2). The damper drive motor (3) is also configured to have a third mode, wherein when the damper blade (4) is closed and the damper through hole (2) is closed, the output shaft of the damper drive motor (3) drives the damper blade (4) to repeatedly swing slightly relative to the damper through hole (2) to prevent the damper blade (4) from being frozen and stuck by the water between the damper blade (4) and the damper through hole (2).

2. A refrigerator door with anti-icing function according to claim 1, characterized in that... The damper drive motor (3) enters the third mode by receiving a control signal from the host computer that is electrically connected to it.

3. A refrigerator door with anti-icing function according to claim 1, characterized in that... The damper drive motor (3) includes a motor body (31) and an integrated control board (32) disposed on the motor body (31) for driving and controlling the power output of the motor body (31). The integrated control board (32) is provided with a motor control chip (33). The motor control chip (33) is configured to have a control signal that controls the output shaft of the motor body (31) to drive the damper blade (4) to repeatedly swing slightly relative to the damper through hole (2) to enter the third mode.

4. A refrigerator door with anti-icing function according to claim 3, characterized in that... The motor control chip (33) integrates a motor logic operation drive unit (321), a pre-drive unit (322), and a full-bridge drive unit (323). The motor logic operation drive unit (321) is used to complete the pulse subdivision algorithm and generate orthogonal SPWM wave pulses in two channels. The pre-drive unit (322) is used to convert the TTL level to a level that can drive the gate of the MOS transistor. The full-bridge drive unit (323) is used to convert the pulse signal into power output and drive the motor body (31) to work by subdividing and modulating the sine wave current output.

5. A refrigerator door with anti-icing function according to claim 4, characterized in that... The motor body (31) is a two-phase claw pole stepper motor. The integrated control board (32) is connected to a three-wire motor connection terminal or three leads for external connection. The three-wire motor connection terminal or three leads correspond to the signal terminal, ground terminal and voltage terminal, respectively.

6. A refrigerator door with anti-icing function according to claim 1, characterized in that... The damper connecting seat (1) has an isolation cavity (6) on one side, and the damper drive motor (3) is fixedly placed in the isolation cavity (6). The isolation cavity (6) has a damper rotation guide hole (11) on the side wall near the damper through hole (2). A co-moving connector (13) is rotatably connected in the damper rotation guide hole (11). One end of the co-moving connector (13) is co-movingly connected to the output shaft of the motor body (31), and the other end of the co-moving connector (13) is co-movingly connected to the damper blade (4).

7. A refrigerator door with anti-icing function according to claim 6, characterized in that... The damper blade (4) is connected to the opposite end of the moving connector (13) by an outer connecting ring (43). A spindle (431) is concentrically arranged inside the outer connecting ring (13). An inner connecting ring (12) is provided at the end of the damper connecting seat (1) away from the damper drive motor (3). The spindle (431) is rotatably inserted into the inner connecting ring (12), and the outer connecting ring (13) is rotatably sleeved on the outside of the inner connecting ring (12).

8. A refrigerator door with anti-icing function according to claim 1, characterized in that... The damper through hole (2) has an annular protrusion (5) on the circumferential edge near the damper blade (4). The annular protrusion (5) has intermittent protrusions (51) at intervals on its outer periphery. A discharge notch (52) is formed between two adjacent intermittent protrusions (51). A groove (53) for accommodating a gasket is formed between the annular protrusion (5) and the intermittent protrusions (51). A cavity (41) is formed on the damper blade (4) near the annular protrusion (7). When the damper blade (4) closes the damper through hole (2), the annular protrusion (7) is placed in the cavity (41).

9. A motor control method for preventing ice buildup on a refrigerator damper, characterized in that... The refrigerator door with anti-icing function as described in claim 1 includes the following steps: S1. Determine whether the damper blade (4) is in the closed state; S2. When it is determined that the damper blade (4) is in the closed state, the host computer outputs a control signal, or the motor control chip (33) on the damper drive motor (3) outputs a control signal, and the output shaft of the drive motor body (31) drives the damper blade (4) to repeatedly swing slightly between the open state and the closed state relative to the damper through hole (2) and enter the third mode. S3. When the third mode reaches the preset time, the host computer stops outputting the control signal to enter the third mode, or the motor control chip (33) on the damper drive motor (3) stops outputting the control signal to enter the third mode, and the host computer outputs the control signal to enter the second mode, or the motor control chip (33) on the damper drive motor (3) outputs the control signal to enter the second mode, so that the output shaft of the motor body (31) reverses to drive the damper blade (4) to block the damper through hole (2); S4. When the refrigerator compartment needs to be replenished with cold air, the host computer outputs a control signal to enter the first mode, or the motor control chip (33) on the damper drive motor (3) outputs a control signal to enter the first mode, so that the output shaft of the motor body (31) rotates in the forward direction to drive the damper blades (4) to open the damper through hole (2). S5. When the cold air is replenished in step S4, the host computer outputs a control signal to enter the second mode, or the motor control chip (33) on the damper drive motor (3) outputs a control signal to enter the second mode, so that the output shaft of the motor body (31) reverses to drive the damper blades (4) to block the damper through hole (2). S6, return to S1, and repeat the loop.

10. A motor control method for preventing ice buildup on a refrigerator door according to claim 9, characterized in that... In step S2, when it is determined that the damper blade (4) is in the just-closed state, the host computer outputs a control signal, or the motor control chip (33) on the damper drive motor (3) outputs a control signal, and the output shaft of the drive motor body (31) drives the damper blade (4) to repeatedly swing slightly between the open state and the closed state relative to the damper through hole (2) and enter the third mode.

Images