Refrigerator air door capable of preventing freezing

Abstract

The utility model discloses an anti-icing refrigerator air door, which is characterized in that an air door driving motor is configured to have a third mode, and in the third mode, when an air door blade closes an air door through hole, an output shaft of the air door driving motor drives the air door blade to repeatedly swing slightly relative to the air door through hole; therefore, water attached between the air door blade and the air door through hole is effectively prevented from freezing and bonding the air door blade and the air door through hole, and the problem that in the prior art, when the air door through hole needs to be opened, an air door driving motor cannot drive the air door blade to be opened is solved. The technical scheme is different from the technical scheme that in the prior art, normal opening of the air door blades is guaranteed in a heating mode, so that the scheme is more energy-saving, it is effectively guaranteed that the refrigerating chamber can supply cold air in time for preservation, and meanwhile the service life of the air door driving motor is prolonged.

Description

[Technical field]

[0001] The utility model relates to the technical field of refrigerator air doors, in particular to a refrigerator air door capable of preventing icing. [Background Technology]

[0002] At present, the freezer and refrigerator compartments in refrigerators share a refrigeration system. The refrigerator damper plays a vital role in how to distribute the cold air entering the two spaces. The refrigerator electric damper is a key component connecting the freezer and refrigerator compartments. Its main function is to control the flow of cold air. When the temperature of the refrigerator compartment needs to be adjusted, the electric damper blades will open or adjust the opening and closing angle to adjust the amount of cold air flowing from the freezer to the refrigerator compartment to control its temperature; when the refrigerator compartment reaches the set temperature, the electric damper will automatically close or stop rotating to keep the refrigerator compartment at a constant low temperature.

[0003] However, since the refrigerator's electronically controlled damper is in direct contact with the refrigerator's cold air, and the temperature of the freezer is generally below -4°C, and the refrigerator door is frequently opened and closed during use, air and moisture will flow into the interior of the refrigerator. At the same time, due to the low frequency of movement of the damper shaft and blades during use, frost and freezing will form on the damper shaft or the blade closing point, causing the motor to be unable to drive the damper shaft and the damper to open and close normally, resulting in damper failure.

[0004] Some existing refrigerators install heating plates or heating coatings around the closed damper, and use electronic control to adjust the electric heating method to prevent the damper's rotating parts from frosting and freezing. However, during use, the heating efficiency is too slow, the adjustment accuracy is low, and the heating process may cause the temperature inside the refrigerator to be unstable. At the same time, 6 to 7 leads need to be connected in the damper structure in a small space, making the wiring harness layout more complicated.

[0005] The utility model is developed and proposed to solve the problems existing in the prior art. [Contents of the utility model]

[0006] The utility model overcomes the shortcomings of the prior art and provides a refrigerator damper that can prevent freezing. The damper drive motor is configured to have a third mode. The third mode is that when the damper blades close the damper through holes, the damper drive motor output shaft drives the damper blades to repeatedly swing slightly relative to the damper through holes, thereby effectively preventing the water attached between the damper blades and the damper through holes from freezing and freezing the two together. The problem in the prior art that the damper drive motor cannot drive the damper blades to open when the damper through holes need to be opened is solved. The use of this solution is also different from the technical solution of the prior art that ensures the normal opening of the damper blades by heating. Therefore, the solution of the utility model is more energy-saving, and effectively ensures that the refrigerator compartment can supply cold air in time to preserve freshness, while increasing the service life of the damper drive motor.

[0007] To achieve the above-mentioned purpose, the utility model provides a refrigerator damper capable of preventing icing, comprising a damper connection seat 1 and a damper drive motor 3, wherein the damper connection seat 1 is placed between a freezing chamber and a refrigerating chamber and is provided with a damper through hole 2 which can communicate between the freezing chamber and the refrigerating chamber, a damper blade 4 for covering the damper through hole 2 can be rotatably connected to the damper connection seat 1, the damper drive motor 3 is relatively fixedly connected to the damper connection seat 1, and the output shaft of the damper drive motor 3 is movably connected to the damper blade 4 to drive the damper blade 4 to rotate to open the damper. Open or close the damper through hole 2; the damper drive motor 3 is configured with a first mode of driving the damper blades 4 in forward rotation to open the damper through hole 2; and a second mode of driving the damper blades 4 in reverse rotation to close the damper through hole 2; the damper drive motor 3 is also configured to have a third mode, and the third mode is that when the damper blades 4 close the damper through hole 2, the output shaft of the damper drive motor 3 drives the damper blades 4 to repeatedly swing slightly relative to the damper through hole 2 to prevent the damper blades 4 from being frozen and bonded by the water between the damper blades 4 and the damper through hole 2.

[0008] In the above-mentioned refrigerator damper capable of preventing icing, the damper driving motor 3 enters the third mode by receiving a control signal from a host computer electrically connected thereto.

[0009] As described above, a refrigerator damper capable of preventing icing, the damper drive motor 3 includes 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, and a motor control chip 33 is arranged on the integrated control board 32. 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.

[0010] As described above, in the refrigerator damper capable of preventing icing, 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 micro-segmentation algorithm and the generation of two-channel orthogonal SPWM wave pulses. The pre-drive unit 322 is used to complete the conversion of TTL level into a level that can drive the gate of the MOS tube. The full-bridge drive unit 323 is used to convert the pulse signal into power output, so as to drive the motor body 31 to work by subdividing the modulated sine wave current output.

[0011] In the anti-icing refrigerator damper as described above, the motor body 31 is a two-phase claw-pole stepper motor, and the integrated control board 32 is connected with a three-wire motor connection terminal or three leads for external connection, and the three-wire motor connection terminal or three leads correspond to the signal terminal, the ground terminal and the voltage terminal respectively.

[0012] As described above, a refrigerator damper capable of preventing icing is provided with an isolation chamber 6 on one side of the damper connecting seat 1, and the damper driving motor 3 is relatively fixedly placed in the isolation chamber 6; the isolation chamber 6 is provided with a damper rotation conducting hole 11 on the side wall near the damper through hole 2, and a synchronous connecting member 13 is rotatably connected in the damper rotation conducting hole 11, one end of the synchronous connecting member is synchronously connected to the output shaft of the motor body 31, and the other end of the synchronous connecting member 13 is synchronously connected to the damper blade 4.

[0013] As described above, in a refrigerator damper capable of preventing icing, an outer connecting ring sleeve 43 is provided at the opposite end where the damper blade 4 is connected to the co-moving connecting member 13, a core shaft 431 is concentrically arranged inside the outer connecting ring sleeve 43, an inner connecting ring sleeve 12 is provided at the end of the damper connecting seat 1 away from the damper driving motor 3, the core shaft 431 is rotatably inserted into the inner connecting ring sleeve 12, and the outer connecting ring sleeve 43 is rotatably sleeved on the outside of the inner connecting ring sleeve 12.

[0014] As described above, a refrigerator damper capable of preventing icing is provided with an annular ridge 5 on the circumferential edge of the damper through hole 2 near the damper blade 4 side, and intermittent ridges 51 are provided at intervals and offset on the outer circumference of the annular ridge 5, and a drainage notch 52 is formed between two adjacent intermittent ridges 51, and a groove 53 for accommodating a gasket is formed between the annular ridge 5 and the intermittent ridges 51, and a concave cavity 41 is formed on the damper blade 4 near the annular ridge 5 side, and when the damper blade 4 closes the damper through hole 2, the annular ridge 5 is placed in the concave cavity 41.

[0015] Compared with the prior art, the beneficial effects of the utility model are:

[0016] 1. When the damper blade is just closed, the damper drive motor enters the third mode to make the damper blade repeatedly swing slightly between closing and opening relative to the damper through hole, thereby effectively preventing the water attached between the damper blade and the damper through hole from freezing and bonding the two, so that the damper blade has the characteristics of reliable and stable opening and closing.

[0017] 2. It effectively avoids the problem of the damper drive motor being blocked due to freezing and bonding between the damper blades and the damper through-holes, which can better protect the damper drive motor and extend its service life.

[0018] 3. The damper drive motor of the utility model drives the damper blades by modulating the sine wave current, which makes the damper blades rotate more smoothly and quietly.

[0019] 4. The motor body of the damper drive motor of the utility model is a two-phase claw-pole stepper motor, and by arranging a motor control chip that integrates a motor logic operation drive unit, a pre-drive unit and a full-bridge drive unit on the integrated control board, the damper drive motor only needs three wires to be connected to the outside, which greatly saves the wiring cost of connecting the damper drive motor to the host computer. [Drawings]

[0020] Figure 1 This is one of the structural schematic diagrams of the refrigerator air door of the utility model;

[0021] Figure 2 This is the second structural schematic diagram of the refrigerator air door of the utility model;

[0022] Figure 3 This is one of the exploded schematic diagrams of the structure of the refrigerator air door of the utility model;

[0023] Figure 4 This is the second exploded schematic diagram of the structure of the refrigerator air door of the utility model;

[0024] Figure 5 It is an exploded schematic diagram of the wind door drive motor in the utility model;

[0025] Figure 6 This is the control principle diagram of the wind door drive motor in the utility model;

[0026] Figure 7 The utility model shows a 2-2 phase excitation sequence diagram of a two-phase claw-pole stepper motor used in the wind door drive motor;

[0027] Figure 8 It is a schematic diagram of the current waveform of the two-phase claw-pole stepper motor used in the wind door drive motor of the utility model;

[0028] Fig. 9 It is a schematic diagram of the connection between the control circuit of the motor control chip and the damper drive motor in the utility model. [Specific implementation method]

[0029] The technical solutions in the embodiments of the present utility model will be described clearly and completely below in conjunction with the accompanying drawings.

[0030] like Figure 1-4As shown, the utility model is a refrigerator damper capable of preventing ice formation, comprising a damper connection seat 1 and a damper drive motor 3, wherein the damper connection seat 1 is placed between a freezer compartment and a refrigerator compartment and is provided with a damper through hole 2 which can communicate between the freezer compartment and the refrigerator compartment, and a damper blade 4 for covering the damper through hole 2 is rotatably connected to the damper connection seat 1, and the damper drive motor 3 is relatively fixedly connected to the damper connection seat 1, and the output shaft of the damper drive motor 3 is movably connected to the damper blade 4 to drive the damper blade 4 to rotate to open or close the damper through hole 2, that is, when the temperature of the refrigerator compartment exceeds a preset temperature and needs to be supplemented with cold air , the damper blade 4 rotates to open the damper through hole 2; the damper drive motor 3 is configured with a first mode of driving the damper blade 4 forward to open the damper through hole 2; and a second mode of driving the damper blade 4 reversely to close the damper through hole 2; the damper drive motor 3 is also configured to have a third mode, and the third mode is that when the damper blade 4 closes the damper through hole 2, 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, thereby effectively preventing the water attached to the damper blade and the damper through hole from freezing and freezing the two, so that the damper blade has the characteristics of reliable and stable switching.

[0031] As an implementation mode of the present utility model, the damper drive motor 3 enters the third mode by a control signal sent by a host computer electrically connected thereto.

[0032] As another embodiment of the present utility model, the damper drive motor 3 includes 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 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.

[0033] Whether it is the first embodiment or the second embodiment, it is mainly achieved by embedding a program that can drive the damper drive motor 3 to enter the third mode on the corresponding host computer or motor control chip 33. The function of this program is mainly to subdivide the steps of the damper drive motor output shaft movement and rotate it back and forth within a certain angle range, thereby obtaining the motion effect of the damper blade 4 repeatedly swinging slightly relative to the damper through hole 2.

[0034] like Fig. 9As shown, the motor control chip 33 is integrated with 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 micro-segmentation algorithm and the orthogonal SPWM wave pulse generation of the two channels. The pre-drive unit 322 is used to complete the TTL level conversion to the level that can drive the gate of the MOS tube. The full-bridge drive unit 323 is used to convert the pulse signal into power output, so as to drive the motor body 31 to work by subdividing the modulated sine wave current output, and as shown in FIG. Figure 7 , 8 As shown, the motor body 31 is driven by the subdivided modulated sine wave current, which drives the damper blades to rotate more smoothly and quietly.

[0035] like Figure 5 , 6 As shown, the motor body 31 is a two-phase claw-pole stepper motor, and the integrated control board 32 is connected with a motor connection terminal or three leads of a three-wire structure for external connection, and the motor connection terminal or three leads of the three-wire structure correspond to a signal terminal, a ground terminal and a voltage terminal. Therefore, the integrated control board with a motor control chip is connected to the host computer with a signal terminal, a ground terminal and a voltage terminal, which simplifies the connection wiring between the refrigerator main control board and the integrated control board, that is, the connection line between the two-phase claw-pole stepper motor and the integrated control board is simplified from the original five lines to the minimum three lines, which reduces the wiring space, optimizes the structure, simplifies the manufacturing process and reduces the cost.

[0036] like Figure 3 , 4 As shown, an isolation chamber 6 is provided on one side of the damper connecting seat 1, and the damper driving motor 3 is relatively fixedly placed in the isolation chamber 6; a damper rotation conducting hole 11 is provided on the side wall of the isolation chamber 6 near the damper through hole 2, and a synchronous connecting member 13 is rotatably connected in the damper rotation conducting hole 11, one end of the synchronous connecting member 13 is synchronously connected to the output shaft of the motor body 31, and the other end of the synchronous connecting member 13 is synchronously connected to the damper blade 4, thereby ensuring that the synchronous connecting member 13 is reliably connected to the damper blade 4 and the output shaft of the motor body 31, and convenient for assembly.

[0037] like Figure 3 As shown, an isolation chamber 6 is provided on one side of the damper connecting seat 1, and the damper driving motor 3 is relatively fixedly placed in the isolation chamber 6. A cover 61 is buckled on the mouth of the isolation chamber, and buckling ears 63 with notches / holes are provided on two opposite sides of the cover 61. Correspondingly, a buckling groove 62 with barbs is provided on the outer wall of the isolation chamber 6. When the cover 61 is buckled with the mouth of the isolation chamber 6, the buckling ear 63 is inserted into the buckling groove 62, and the barbs in the buckling groove 62 are then snapped into the notches / holes of the buckling ear 63. With such a structural design, after the cover 61 is buckled with the mouth of the isolation chamber 6, the outer side surface of the isolation chamber 6 is flat and simple, and the connection is stable and reliable.

[0038] like Figure 3 , 4 As shown, in order to ensure that the damper blade 4 rotates smoothly and stably, an outer connecting ring sleeve 43 is provided at the opposite end where the damper blade 4 is connected to the co-moving connecting member 13, a core shaft 431 is concentrically arranged inside the outer connecting ring sleeve 43, an inner connecting ring sleeve 12 is provided at the end of the damper connecting seat 1 away from the damper drive motor 3, the core shaft 431 can be rotatably inserted into the inner connecting ring sleeve 12, and the outer connecting ring sleeve 43 can be rotatably sleeved on the outside of the inner connecting ring sleeve 12.

[0039] like Figure 4 As shown, the damper through hole 2 is provided with an annular convex edge 5 at the circumferential edge near the damper blade 4, and the outer circumference of the annular convex edge 5 is provided with intermittent convex edges 51 at intervals and offsets, and a drainage notch 52 is formed between two adjacent intermittent convex edges 51, and a groove 53 for accommodating a gasket is formed between the annular convex edge 5 and the intermittent convex edge 51. The gasket is generally made of elastic material, such as sponge; the damper blade 4 is formed with a concave cavity 41 near the annular convex edge 5, and when the damper blade 4 closes the damper through hole 2, the annular convex edge 5 is placed in the concave cavity 41. When the damper blade 4 is closed, the damper blade 4 compresses the gasket to deform, and the air and water in the gasket and the groove can be discharged through the drainage notch 52, so that it is closed more tightly, ensuring better freezing and preservation effects.

[0040] For the refrigerator damper capable of preventing icing of the utility model, the working steps include the following:

[0041] S1, determining whether the damper blade 4 is in a closed state;

[0042] S2. When it is determined that the damper blade 4 is in the closed state, and preferably, when 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 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 is likely to have been frozen and bonded to the damper through hole by the water therebetween, so the third mode is preferably started when the damper blade 4 is just closed;

[0043] S3, when the third mode reaches the preset time, the host computer stops outputting the control signal for entering the third mode, or the motor control chip 33 on the damper drive motor 3 stops outputting the control signal for entering the third mode, and the host computer outputs the control signal for entering the second mode, or the motor control chip 33 on the damper drive motor 3 outputs the control signal for entering the second mode, so that the output shaft of the motor body 31 is reversed to drive the damper blade 4 to block the damper through hole 2;

[0044] S4, when a refrigerator compartment needs to be supplemented with cold air, the upper 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 forward to drive the damper blades 4 to open the damper through hole 2;

[0045] S5, when the cold air replenishment in step S4 is completed, 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 is reversed to drive the damper blades 4 to block the damper through hole 2;

[0046] S6. Return to S1 and repeat the cycle.

[0047] In summary, the utility model effectively prevents water attached to the damper blade and the damper through hole from freezing and bonding the two together, so that the damper blade has the characteristics of reliable and stable switching; and effectively avoids the problem of the damper drive motor being blocked due to ice, freezing and bonding between the damper blade and the damper through hole, which can better protect the damper drive motor and extend its service life; and makes the rotation process of the damper blade smoother and quieter.

[0048] The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. All equivalent structural changes made using the contents of the present invention specification and drawings under the utility model concept, or directly or indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A refrigerator damper capable of preventing icing, characterized in that The invention comprises a damper connection seat (1) and a damper drive motor (3), wherein the damper connection seat (1) is disposed between a freezing chamber and a refrigerating chamber and is provided with a damper through hole (2) which can communicate between the freezing chamber and the refrigerating chamber, wherein a damper blade (4) for covering the damper through hole (2) is rotatably connected to the damper connection seat (1), and the damper drive motor (3) is relatively fixedly connected to the damper connection seat (1), and an output shaft of the damper drive motor (3) is synchronously connected with 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 to have a first mode of driving the damper blade (4) in a forward rotation to open the damper through hole (2); and a second mode of driving the damper blade (4) in a reverse rotation to close the damper through hole (2); The damper drive motor (3) is further configured to have a third mode, wherein in the third mode, when the damper blade (4) closes the damper through hole (2), the damper drive motor (3) output shaft 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 bonded by water between the damper blade (4) and the damper through hole (2).

2. The anti-icing refrigerator damper according to claim 1, characterized in that The damper drive motor (3) enters the third mode when a control signal is sent by a host computer electrically connected to the damper drive motor (3).

3. The anti-icing refrigerator damper according to claim 1, characterized in that The damper drive motor (3) 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); a motor control chip (33) is arranged on the integrated control board (32); the motor control chip (33) is configured to have a control signal for controlling 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 a third mode.

4. The anti-icing refrigerator damper according to claim 3, characterized in that The motor control chip (33) is integrated with 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 a pulse micro-segmentation algorithm and two-channel orthogonal SPWM wave pulse generation; the pre-drive unit (322) is used to complete TTL level conversion to a level that can drive the gate of a MOS tube; and the full-bridge drive unit (323) is used to convert a pulse signal into a power output, so as to drive the motor body (31) to work by subdividing the modulated sine wave current output.

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

6. The anti-icing refrigerator damper according to claim 1, characterized in that An isolation chamber (6) is provided on one side of the damper connection seat (1), and the damper drive motor (3) is relatively fixedly disposed in the isolation chamber (6); a damper rotation guide hole (11) is provided on a side wall of the isolation chamber (6) close to the damper through hole (2), and a synchronous connection member (13) is rotatably connected in the damper rotation guide hole (11), one end of the synchronous connection member (13) is synchronously connected to an output shaft of a motor body (31), and the other end of the synchronous connection member (13) is synchronously connected to a damper blade (4).

7. The anti-icing refrigerator damper according to claim 6, characterized in that An outer connecting ring sleeve (43) is provided at the opposite end of the damper blade (4) connected to the co-moving connecting member (13), a core shaft (431) is coaxially arranged inside the outer connecting ring sleeve (43), an inner connecting ring sleeve (12) is provided at the end of the damper connecting seat (1) away from the damper drive motor (3), the core shaft (431) is rotatably inserted into the inner connecting ring sleeve (12), and the outer connecting ring sleeve (43) is rotatably sleeved on the outside of the inner connecting ring sleeve (12).

8. The anti-icing refrigerator damper according to claim 1, characterized in that The damper through hole (2) is provided with an annular convex edge (5) on the circumferential edge close to the damper blade (4); the annular convex edge (5) is provided with intermittent convex edges (51) at intervals and offsets on the outer circumference of the annular convex edge (5); a discharge notch (52) is formed between two adjacent intermittent convex edges (51); a groove (53) for accommodating a gasket is formed between the annular convex edge (5) and the intermittent convex edges (51); a concave cavity (41) is formed on the damper blade (4) close to the annular convex edge (5); and when the damper blade (4) closes the damper through hole (2), the annular convex edge (5) is placed in the concave cavity (41).

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