CN218672805U

CN218672805U - A kind of refrigerator

Info

Publication number: CN218672805U
Application number: CN202222522565.9U
Authority: CN
Inventors: 赵璞; 赵申秋; 王湛海
Original assignee: Qingdao Haier Special Refrigerator Co Ltd; Haier Smart Home Co Ltd
Current assignee: Qingdao Haier Special Refrigerator Co Ltd; Haier Smart Home Co Ltd
Priority date: 2022-09-22
Filing date: 2022-09-22
Publication date: 2023-03-21
Anticipated expiration: 2032-09-22

Abstract

The utility model relates to a refrigerator, include: a housing for forming a normal temperature chamber and a refrigeration chamber; the fan is arranged in the refrigerating chamber; the fan controller is arranged in the room at normal temperature; the fan controller is connected with the fan in the refrigerating chamber through a control wire harness.

Description

A kind of refrigerator

Technical Field

The utility model relates to a household electrical appliances field especially relates to the improvement to the refrigerating system of refrigerator.

Background

In order to realize better preservation of food materials, the storage temperature of the refrigerator freezer is lower and lower. When the temperature of the evaporator is lower than-40 ℃, the temperature of the fan is also lower than-40 ℃ because the fan is close to the evaporator. In order to control the fan, a hall sensor is arranged in a motor of the fan to sense the position of a rotor, the low-temperature limit value of semiconductors such as hall elements and power tubes in consumer-grade products is usually-40 ℃, and the reliability cannot be guaranteed at lower temperature.

For refrigerators at temperatures in the range of-40 ℃ and below, the temperature is lower than the normal operating temperature range of components such as consumer-grade hall elements, while the price of elements at lower temperatures is higher.

Some manufacturers disclose techniques for heating motors to solve the problem of too low motor temperature. For example, utility model patent publication No. CN 213235495U discloses a motor heating technique that heats a semiconductor device in a motor by a heating device to maintain the ambient temperature inside the motor within a normal operating temperature range of the semiconductor device.

This, however, undoubtedly increases the construction and system complexity of the motor, increasing the use and manufacturing costs.

At present, a common weak current fan used in a refrigerator and a freezer on the market is a BLDC fan with a Hall element, can be normally used within the temperature range of less than-40 ℃, and has low cost.

The application provides a sensorless BLDC fan which is used in a subzero refrigerator freezer at the temperature of-40 ℃.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing an use refrigerator of BLDC fan, can use the lower BLDC fan of cost to support the normal work of BLDC motor in the freezer of-40 ℃ cryrogenic refrigerator again promptly.

In order to realize this utility model purpose the application provides a refrigerator includes: a housing for forming a normal temperature chamber and a refrigeration chamber; the fan is arranged in the refrigerating chamber; the fan controller is arranged in the normal-temperature chamber; the fan controller is connected with the fan in the refrigerating chamber through a control wire harness.

As a further improvement of an embodiment, the fan does not include a semiconductor device.

As a further improvement of an embodiment, the fan controller includes a fan driver having a master controller connected to the master controller, the fan driver includes a harness interface, and the harness interface includes an ESD protection circuit.

As a further improvement of an embodiment, the ESD protection circuit includes a TVS diode, a first terminal of the TVS diode is connected to the wire harness interface, and a second terminal of the TVS diode is grounded.

As a further improvement of an embodiment, the length of the wire harness is 0.1 meter to 3 meters.

As a further improvement of an embodiment, the fan controller includes a filter, an input end of the filter is connected to the wire harness interface, and an output end of the filter is connected to the fan controller.

As a further improvement of an embodiment, the housing includes an inner housing and an outer housing, the refrigeration compartment is formed within the inner housing and is in gaseous communication with the refrigerator storage compartment through an air duct; the normal temperature chamber is arranged in the outer shell, and the normal temperature chamber and the inner shell are horizontally arranged at intervals.

As a further improvement of an embodiment, the outer case includes a receiving portion recessed toward an inside of the refrigerator case, the recess of the receiving portion forming the room temperature chamber; the inner shell and the accommodating part are correspondingly recessed towards the inner part of the refrigerator shell to form a space between the normal temperature chamber and the inner shell.

As a further improvement of an embodiment, the fan is disposed inside the inner case recess.

As a further improvement of an embodiment, the accommodating portion provides an opening, and the outer case includes a cover plate for closing the opening, the cover plate being opened so that the opening of the accommodating portion is exposed to the outside.

The technical scheme has the advantages over the prior art that: 1. the BLDC motor and the controller are separated and are respectively arranged in the refrigerating chamber and the normal-temperature chamber, so that the BLDC motor supports a deep cooling mode, a semiconductor device is not included in the motor, the reliability of the whole machine is guaranteed during deep cooling at the temperature of-40 ℃, and the poor fan caused by low-temperature failure of the semiconductor device is reduced; 2. the manufacturing cost of the whole machine is reduced.

Drawings

Fig. 1 is a schematic view of a refrigerator.

Fig. 2 is a schematic view of another refrigerator.

FIG. 3 is a schematic diagram of a fan master controller module.

Fig. 4 is a schematic diagram of a first isometric structure of the refrigerator.

FIG. 5 is a schematic diagram of a second side structure of the refrigerator.

Fig. 6 is a schematic sectional structure view of the refrigerator.

Fig. 7 is a partial schematic view of an inner shell structure.

FIG. 8 is a partial schematic view of yet another inner shell construction.

Fig. 9 is a schematic view of the structure of the accommodating portion.

Fig. 10 is a schematic view of an air deflector.

Detailed Description

In the following, the present application will be described in further detail with reference to the accompanying drawings, where the terms "inside" and "outside" in the present application refer to the storage compartment of the refrigerator, and the internal spaces of the storage compartments, such as the refrigerating compartment and the freezing compartment, of the refrigerator are "inside" and the internal spaces of the storage compartments, such as the refrigerating compartment and the freezing compartment, of the refrigerator are "outside". Likewise "inside" is close to the storage compartment and "outside" is remote from the storage compartment.

Example one

Fig. 1 is a schematic view of a refrigerator 100, in which structures other than a blower fan 130, such as a case 110, an air path 124, a compressor duct, an evaporator 123, and the like of the refrigerator 100, are simplified. But does not affect the understanding of the technical solutions of the present application by those skilled in the art.

Such as refrigerator 100 shown in fig. 1. It includes a housing 110 for forming a normal temperature chamber 121 and a cooling chamber 122; a fan 130 disposed in the refrigerating compartment 122; a fan controller 131 disposed in the normal temperature chamber 121; the fan controller 131 is connected to the fan 130 in the refrigerating compartment 122 through a control harness 132.

The fan 130 includes an impeller 133 (see fig. 7) for blowing air and a direct current brushless motor 140 (BLDC). The dc brushless motor 140 includes only the necessary rotating and driving components such as the housing 141, the rotor, the winding coil 142, and the stator, and the dc brushless motor 140 does not include semiconductor devices; these semiconductor devices include, but are not limited to: hall sensor, temperature sensor, power switch tube, triode, protection diode etc..

Semiconductor sensors, chips, and driving circuits for controlling the dc brushless motor 140 are provided on the fan controller 131, and the fan controller 131 and the motor are connected only by an extended control harness 132. The harness supplies a current that drives the dc brushless motor 140 modulated by the driver 160 so that the motor rotates according to the instructions of the controller 131.

In a preferred embodiment, the length of the wire harness is 0.1 meter to 3.0 meters.

In a preferred embodiment, the length of the wire harness is 0.1-2.5 meters.

In a preferred embodiment, the length of the wire harness is 0.1 meter to 2.0 meters.

In a preferred embodiment, the length of the wire harness is 0.1 meter to 1.5 meters.

In a preferred embodiment, the length of the wire harness is 0.1 meter to 1.0 meter.

In a preferred embodiment, the length of the wire harness is 0.1 meter to 0.5 meter.

In a preferred embodiment, the harness has a length of 2 meters.

The fan 130 may normally operate in a cryogenic environment below-40 ℃. The motor of the fan does not comprise a semiconductor device, and necessary devices (the shell, the 141 rotor, the winding coil 142, the stator and the like) of the fan are not influenced by temperature when working, so that the motor can normally work in a cryogenic environment. The driving of the dc brushless motor 140 is controlled only by a current signal of the control wire harness 132, and the fan controller 131 is provided under a normal temperature environment and its semiconductor devices normally operate at a normal temperature. Therefore, in the above scheme, the normal-temperature working device is placed in the normal-temperature chamber 121 and the low-temperature working device is placed in the refrigerating chamber 122 according to the working characteristics of the different devices, so that the fan 130 normally works in the cryogenic environment at-40 ℃.

In a preferred embodiment, the dc brushless motor 140 is a three-phase motor, the first ends 143 of the three-phase motor stator coils are connected together, and the second ends 144 of the three-phase motor stator coils are connected to U, V, W output lines, respectively, as known to those skilled in the art, where U, V, W corresponds to abc three phases of an ac signal, respectively.

The circuit of fig. 2 is added with an ESD protection circuit 162 to the circuit of fig. 1.

In a preferred embodiment, the UVW lines are respectively connected to a harness interface 161 of the driver 160 of the blower 130. The harness interface 161 of the blower driver 160 is connected to the ESD protection circuit 162, the ESD protection circuit 162 includes a TVS diode 163, a first end of the TVS diode 163 is connected to the harness interface 161, and a second end of the TVS diode 163 is grounded.

Adding ESD protection to the wiring harness interface 161 circuitry prevents electrostatic interference signals from impinging on the semiconductor device.

The fan driver 160 includes power devices that are turned on or off at appropriate time under the control of the controller 131 to control the motor to rotate according to a preset program of the controller 131, and the motor driver 160 is well known to those skilled in the art and will not be described herein.

The fan controller 131 includes a master controller 150 coupled to a fan driver 160. The main controller 150 is connected to the fan driver 160 through a VCC port (power supply) GND port (ground) PWM port (duty ratio adjustment) Feedback port (Feedback), and the fan driver 160 feeds back a rotation signal of the motor and receives a PWM control signal to control the rotation of the motor.

The feedback signal (feedback) includes information for detecting the position of the motor rotor. The feedback signal includes a reverse electromotive force wave generated by a winding when the motor rotor rotates, the main controller 150 may obtain a position where the motor rotor is driven by detecting a zero-crossing point signal of a reverse electromotive force waveform, and control the PWM port to output a signal through a control circuit/software.

The motor rotation information is fed back by detecting the back electromotive force, the rotation signal can be transmitted to the fan controller 131 through the extended control harness 132, so that the motor can complete the position detection without a semiconductor sensor, thereby arranging the semiconductor device separately from the motor main body in the deep cooling compartment and the normal temperature compartment 121.

Referring to fig. 3, a schematic diagram of a main controller 150 is shown, wherein the module can be implemented by using dedicated circuits, software, field programmable gate arrays, general processors, etc. as is well known to those skilled in the art.

The master 150 includes a filter 151 and a position detection module 152. Because the harness connecting the fan body and the driver 160 has a long length (up to 3 meters), waveform distortion and external interference are heavy, and the back electromotive force waveform zero-crossing detection is more difficult, the back electromotive force signal in the harness is filtered by using the specific filter 151, so that the influence of the waveform distortion and the external interference on the fan 130 is reduced.

In a preferred embodiment, the filter 151 filters for a specific filter function, and the compensation angle is re-calibrated after the filter filtering.

In a preferred embodiment, the filter 151 is a filter circuit.

In a preferred embodiment, the filter 151 is an analog filter or a digital filter.

In a preferred embodiment, the filter 151 is a low pass filter, a high pass filter, a band pass filter, or a band stop filter.

In a preferred embodiment, the filter 151 is a passive filter, an active filter.

In a preferred embodiment, the filter 151 is integrated within the driver 160.

And a position detection module 152 for determining motor rotation information and outputting a PWM control signal. The position detection module 152 converts the back electromotive force waveform into a digital signal through an analog-to-digital conversion circuit, and compares the digital signal with a reference value, which is a zero-crossing point when the back electromotive force crosses the reference value from high to low or from low to high. When the zero crossing point is detected, the position of the motor rotor may be determined, and the position detection module 152 determines a PWM output signal according to the detected position information of the motor rotor, and outputs the PWM output signal to the fan 130.

The filter 151 allows the back electromotive force signal including the position information of the motor rotor to be accurately detected by the main controller 150 even if the waveform is distorted or the external environment is disturbed. This enables both the drive current and the motor position signal to be transmitted through the extended control harness 132. The fan 130 is separated from the fan 130 controller 131 by an extended harness without the need for hall sensors in the motor.

Refrigerator 100 further includes evaporator 123 and air path 124 in cooling compartment 122. Referring to fig. 1, the evaporator 123 is connected to a compressor of the refrigerator 100 through a refrigerant pipe, and refrigerant circulates between the evaporator 123 and the compressor to provide cooling. The air inside the storage compartment 120 of the refrigerator 100 exchanges with the air of the cooling compartment 122 when the blower fan 130 is rotated, thereby cooling the storage compartment 120.

In a preferred embodiment, the storage room 120 includes a refrigerating compartment, a freezing compartment, a zero-degree fresh-keeping compartment, an ice-making compartment, etc.; the air path 124 includes a plurality of branches, which correspond to the refrigerating compartment, the freezing compartment, the zero-degree fresh-keeping compartment, and the ice-making compartment, respectively, to form cold air circulation in different compartments, and the branches distribute different air volumes to the different compartments to provide corresponding cold energy.

Example two

The principle of the cooling fan 290 of this embodiment is the same as that of the first embodiment.

Referring to fig. 4 and 5, a refrigerator main body 200 is shown without a door, a refrigerator interior light, a storage plate, and the like, wherein fig. 5 also omits a rear plate of a rear portion of the refrigerator.

The refrigerator main body 200 includes a storage chamber 210 formed of a case, the storage chamber 210 including a refrigerating chamber 212 of an upper layer, a zero-degree fresh-keeping chamber 213 of a middle layer, and a freezing chamber 214 of a bottom layer, and inner walls of both sides of the storage chamber 210 including a plurality of shelf grooves 215 through which shelf plates (e.g., tempered glass plates) are fixed.

At the back of the refrigerator, a blower controller 320 is connected to the blower 290 in the cooling compartment 220 via a control harness 311/312.

Referring to fig. 6, a sectional structure of a main body 200 of a refrigerator is schematically shown.

The cooling compartment 220 and the normal temperature compartment 230 are horizontally spaced apart from each other. The housing includes an inner housing 240 and an outer housing 250, the refrigerating compartment 220 is formed in the inner housing 240 and is in gas communication with the refrigerator storage compartment 210 through a duct 280; the room temperature chamber 230 is disposed in the outer housing 250, and the room temperature chamber 230 is horizontally spaced from the inner housing 240 by a distance d. The blower 290 is disposed inside the inner housing recess 243. The outer case 250 includes a receiving part 270 depressed toward the inside of the refrigerator case, and the depression 243 of the receiving part 270 forms the normal temperature chamber 230; the inner case 240 is recessed 243 toward the inside of the refrigerator case at a position corresponding to the receiving portion 270 to form a certain distance d between the normal temperature chamber 230 and the inner case 240.

The distance d is such that an air layer is formed between the normal temperature compartment 230 and the cooling compartment 220, and the air layer prevents direct heat exchange between the cooling compartment 220 and the normal temperature compartment 230, so that the environment in the normal temperature compartment 230 is close to or equal to the normal temperature, and the semiconductor device therein can keep normal operation in the temperature range of-40 ℃ or above.

The refrigeration compartment 220 is formed by the structure of the inner housing 240 shown in fig. 6, 7 and 10. The inner housing 240 is divided into a first housing layer 241 and a second housing layer 242. The first housing layer 241 is substantially Z-shaped plate in cross section, the first end of the second housing layer 242 is close to the first end 2411 of the Z-shaped plate, the second end of the second housing layer 242 is far from the second end 2422 of the Z-shaped plate, and the space between the second ends of the first housing layer 241 and the second housing layer 242 forms the refrigerating compartment 220.

The blower 290 is fixed to the first case layer 241. The first end of the zigzag plate on the first shell layer 241 is provided with a fan cavity 291, the fan cavity 291 comprises a double-volute structure 292, a double-volute air duct 295 formed by the double-volute structure 292, an opening 293 of the first volute air duct is connected with an upper air duct 285, and an opening 294 of the second volute air duct is connected with a lower air duct 286.

An opening 284 is provided in the first housing layer 241 to the storage chamber 210. The upper duct 285 provides at least one first opening 281 to the refrigerating compartment 212, the duct 280 provides at least one second opening 282 to the zero-degree fresh food compartment 213, and the lower duct 280 provides at least one third opening 283 to the freezing compartment 214.

In a preferred embodiment, a wind deflector 244 is disposed on the first case layer 241. The air deflector 244 is an arc-shaped extending structure parallel to the second housing layer 242. The distance between the air deflector 244 and the first casing 241 is reduced relative to the width of the upper air duct 280, and an upper air outlet 284 with a narrow upper air duct 280 is formed between the air deflector 244 and the first casing 241. The air guide plate 244 comprises a plurality of parallel air guide plates 2440, an air guide groove 211 corresponding to the air guide plates 2440 is formed on the first shell layer 241, and the air guide groove 211 extends from the side where the air guide plate 244 is located to the top of the refrigerator.

The narrow upper air outlet 284 of the air duct 280 accelerates the air flowing out of the upper air duct 280, and the air deflector 244 guides the accelerated air to flow along the air guiding grooves 211 of the first casing layer 241. Due to the coanda effect of the airflow, the air guide grooves 211 guide the air to flow from the side to the top, so that the cold air is guided to the top, and the circulation, convection and heat exchange of the cold air in the refrigerating chamber 212 are more sufficient.

Reference is made to the second shell layer 242 shown in fig. 8. The second case layer 242 forms a main body space of the storage compartment 210 in the refrigerator, and includes the air guide groove 211 at an upper portion thereof, and the air guide groove 211 extends from a side surface to a top portion of the refrigerating compartment 212. An opening 2423 is formed on the second shell layer 242, the opening 2423 is connected to the inside of the refrigeration compartment 220, and the opening allows a cable in the refrigeration compartment 220 to pass through and be connected with the fan controller 320. One skilled in the art will appreciate that a reasonable sealing arrangement should be provided to ensure that the opening 2423 can pass the cables of the ventilator 290 while maintaining the sealed condition of the refrigeration compartment 220.

The second housing layer 242 forms a recessed structure 243 outside the blower 290. The position of the second casing layer 242 corresponding to the blower fan 290 is recessed 243 toward the inside of the refrigerator. The part of the recess 243 forms an upper closed structure of the volute duct 295 of the blower 290 to ensure that the volute duct 295 can supply air normally; the second aspect forms the interval between the normal temperature compartment 230 and the inner case 240 to reduce heat exchange between the normal temperature compartment 230 and the refrigerating compartment 220.

The receiving portion 270 has a substantially box-like structure with reference to fig. 9. The receiving portion 270 includes an inner space for receiving the blower fan controller 320, and an edge 272 for fixing with the refrigerator outer case 250, a side wall of the receiving portion 270 is provided with a harness inlet 271, and the extension control harness 310 of the blower fan 290 is connected with the harness interface of the blower fan 290 controller through the harness inlet 271. The receiving portion 270 includes an opening 273, and the blower 290 controller is mounted to the inside of the receiving portion 270 through the opening 273.

In a preferred embodiment, the outer case 250 includes a cover plate (not shown) for closing the opening 273, and the opening 273 of the receiving part is exposed to the outside when the cover plate is opened.

The opening 273 of the accommodating part has two functions, the first is convenient to open to the fan 290 controller overhauls during the apron, the second is the opening is convenient for room temperature compartment 230 and external environment heat exchange, keeps the normal atmospheric temperature state of room temperature compartment 230, makes the ambient temperature of fan 290 controller keeps in the within range of normal work.

The wiring harness connected to the fan controller in the housing portion may include a plurality of types of control wiring harnesses. The control harness 310 includes a first harness 311 and a second harness 312, and the first harness 311 is connected to the blower 290 motor from the harness inlet 271 of the receiving portion 270 through the space between the outer case 250 and the inner case 240, and further through an opening 2423 of the second case layer 242.

The wire harnesses further include a third wire harness 313 and a fourth wire harness 314. Alternatively, the third and

fourth harnesses

313 and 314 may be 220v ac power harnesses, temperature sensor harnesses, light control harnesses 310, compressor control harnesses 310, and the like.

Referring to fig. 5, in order to reduce the lengths of the first and second wire harnesses 311 and 312, the heights of the receiving portion 270, the refrigerating compartment 220, the blower fan 290, and the recess 243 on the second case layer 242 are substantially equal. Reducing the length of the wire harness can reduce the waveform distortion of the fan brushless motor back electromotive force, which is beneficial to zero crossing point detection.

Compared with the prior art, the technical scheme at least has the following positive technical effects: 1. the motor of the fan does not contain a semiconductor device, so that the defect of the fan caused by low-temperature failure of the semiconductor device is reduced; 2. the fan controller uses consumer-grade devices to reduce the manufacturing cost of the whole machine 3. The fan controller and the fan separation structure are convenient to maintain 4. The air circulation, convection and heat exchange effects in the storage chamber with the air guide structure arranged in the inner shell are better.

Claims

1. A refrigerator, characterized by comprising:

a housing for forming a normal temperature chamber and a refrigeration chamber;

the fan is arranged in the refrigerating chamber;

the fan controller is arranged in the normal-temperature chamber;

the fan controller is connected with the fan in the refrigerating chamber through a control wire harness.

2. The refrigerator of claim 1, wherein the blower fan does not include a semiconductor device.

3. The refrigerator of claim 2, wherein the fan controller comprises a master controller, a fan driver connected to the master controller, the fan driver comprising a harness interface, the harness interface comprising an ESD protection circuit.

4. The refrigerator of claim 3, wherein the ESD protection circuit comprises a TVS diode, a first terminal of the TVS diode is connected to the harness interface, and a second terminal of the TVS diode is connected to ground.

5. The refrigerator of claim 4, wherein the harness length is 0.1-3 meters.

6. The refrigerator of claim 3, wherein the blower controller comprises a filter, an input end of the filter is connected with the wire harness interface, and an output end of the filter is connected with the blower controller.

7. The refrigerator of claim 1, wherein the housing comprises an inner housing and an outer housing, the refrigeration compartment being formed within the inner housing and being in gaseous communication with the refrigerator storage compartment through an air duct; the normal temperature chamber is arranged in the outer shell, and the normal temperature chamber and the inner shell are horizontally arranged at intervals.

8. The refrigerator as claimed in claim 7, wherein the outer case includes a receiving part recessed to an inside of the refrigerator case, the recess of the receiving part forming the normal temperature chamber; the inner shell and the accommodating part are correspondingly recessed towards the inner part of the refrigerator shell to form a space between the normal temperature chamber and the inner shell.

9. The refrigerator according to claim 8, wherein the blower fan is disposed inside the inner case recess.

10. The refrigerator of claim 8, wherein the receiving portion provides an opening, and the outer case includes a cover plate for closing the opening, the cover plate being opened such that the opening of the receiving portion is exposed to the outside.