CN116182278A

CN116182278A - Outdoor unit grille assembly, air conditioner outdoor unit, air conditioner and control method of air conditioner

Info

Publication number: CN116182278A
Application number: CN202211640441.9A
Authority: CN
Inventors: 刘志鹏; 熊硕; 陈昭骏; 唐碧海; 刘菲菲; 欧阳效来
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2022-12-20
Filing date: 2022-12-20
Publication date: 2023-05-30

Abstract

The invention provides an outdoor unit grille assembly, an air conditioner outdoor unit, an air conditioner and a control method thereof, and belongs to the technical field of air conditioning. The invention can be controlled to be in a sealing state when the fan blade of the outdoor unit is not rotated, so that the phenomenon that external rainwater, dust, insects and the like enter the outdoor unit to corrode the fan blade of the outdoor unit and even cause short circuit of a main board of an electric appliance box is effectively prevented, and the fan blade is controlled to be in a through-flow state to ensure heat exchange efficiency when rotating, and the adjustment requirements of different working conditions or different turning angles under weather conditions are realized by controlling the inside and outside turning of the fan blade.

Description

Outdoor unit grille assembly, air conditioner outdoor unit, air conditioner and control method of air conditioner

Technical Field

The invention belongs to the technical field of air conditioning, and particularly relates to an outdoor unit grille assembly, an air conditioner outdoor unit, an air conditioner and a control method of the air conditioner.

Background

The air conditioner is used as a widely used heat dissipating device, the air output of the air outlet of the air conditioner has decisive influence on heat exchange of the air conditioner, the general grid air outlet is of a rib structure between horizontal and vertical phases, the air generated by the fan flows out from gaps of the ribs, but the grid is of a fixed structure and is also in a ventilation state in a non-working state, at the moment, external rainwater, dust, insects and the like can enter the gaps to corrode fan blades of the air conditioner, and the insects can also enter the electric box to cause the problems of short circuit of a main board and the like.

Disclosure of Invention

Therefore, the invention provides an outdoor unit grille assembly, an air conditioner outdoor unit, an air conditioner and a control method thereof, which can solve the technical problem that in the prior art, the outdoor unit grille assembly adopts a rib structure which is arranged alternately horizontally and vertically, the outdoor unit is in a normally-on state in a non-working state, and external rainwater, dust, insects and the like enter the outdoor unit from the outdoor unit to corrode the fan blades of the outdoor unit and even cause short circuit of a main board of an electric appliance box.

In order to solve the above problems, the present invention provides an outdoor unit grill assembly, comprising a grill body having a plurality of ventilation openings disposed in a circumferential direction, each of the ventilation openings being provided with a vane, each of the vanes having a ventilation state allowing the ventilation opening to be ventilated and a sealing state intercepting the ventilation opening to be rotated around a central symmetry axis thereof to switch between the ventilation state and the sealing state.

In some embodiments, the first end of the blade has a drive shaft with a driven gear thereon, and the central region of the grille body is provided with a drive arrangement that is simultaneously in driving connection with each of the driven gears.

In some embodiments, the drive device comprises a rotary motor and a main drive gear that is coupled to an output shaft of the rotary motor, the main drive gear being in driving connection with the driven gear via an intermediate transmission.

In some embodiments, the central region of the grid body has an annular wall with an opening on a side facing away from the grid body, the opening being covered with a platen, and the rotary motor is assembled on the side of the platen facing away from the annular wall.

In some embodiments, the intermediate transmission member includes a rotation shaft, and both ends of the rotation shaft are rotatably supported on the pressing plate and the grid body, respectively.

In some embodiments, the intermediate transmission member further includes a first transmission gear and a second transmission gear, the first transmission gear and the second transmission gear are disposed at intervals along the axial direction of the rotating shaft, the first transmission gear is meshed with the main driving gear teeth, and the second transmission gear is meshed with the driven gear teeth.

In some embodiments, the second drive gear is on a side of the first drive gear that is adjacent to the swing motor; and/or the driven gear and the second transmission gear are bevel gears, and the main driving gear and the first transmission gear are straight gears.

In some embodiments, the transmission ratio between the main drive gear and the first transmission gear is i1, i1=2, and the transmission ratio between the second transmission gear and the driven gear is i2, i2=2.5.

In some embodiments, the side of the main drive gear remote from the rotary motor has a support shaft rotatably supported on the grid body.

In some embodiments, a plurality of clamping arms are disposed on a side of the pressing plate facing the annular wall, and a plurality of clamping grooves are disposed on the annular wall along a circumferential direction of the annular wall at intervals, and each clamping arm is respectively and correspondingly connected in each clamping groove in a snap-fit manner.

In some embodiments, the annular wall is further provided with a plurality of matching grooves arranged at intervals along the circumferential direction, each driving shaft is accommodated in the matching groove, and the notch of the matching groove faces to one side of the pressing plate.

In some embodiments, the notch of the matching groove is in a horn mouth structure, the opening angle of the horn mouth structure towards one side of the pressing plate is gradually increased, and the opening angle of the horn mouth structure is c, and the opening angle is 120 degrees less than or equal to c less than or equal to 70 degrees; and/or the clearance between the matching groove and the driving shaft is 0.1mm-0.3mm.

The invention also provides an air conditioner outdoor unit which comprises the outdoor unit grille component.

The invention also provides an air conditioner comprising the air conditioner outdoor unit.

The invention also provides a control method of the air conditioner, which is used for controlling the operation of the air conditioner, and comprises the following steps:

when a starting instruction of the air conditioner is acquired, detecting whether blades of an outdoor unit of the air conditioner rotate or not;

if the fan blade does not rotate, controlling the fan blade to be in the sealing state;

if the fan blade rotates, further acquiring the outdoor environment temperature Ty, and controlling the turning angle of the fan blade according to the acquired outdoor environment temperature Ty so as to enable the fan blade to be in different through-flow states.

In some embodiments, if the fan blade rotates, further acquiring the outdoor environment temperature Ty, and controlling the turning angle of the fan blade according to the acquired outdoor environment temperature Ty, so that the fan blade is in different through-flow states specifically includes:

when Ty is greater than T1, controlling the turning first angle of the blade; or,

and when Ty is less than or equal to T1, controlling the air conditioner to enter a low-temperature refrigeration control mode.

In some embodiments, when the air conditioner enters a low-temperature refrigeration control mode, the heat exchanger tube temperature T tube of the air conditioner indoor unit is obtained,

when the T pipe is more than T2, controlling the blade to turn over a second angle; or,

when T2 is more than or equal to T3, controlling the blade to turn over a third angle, and controlling the fan blade of the air conditioner outdoor unit to run in a low wind shield mode; or,

when T3 is more than or equal to T4, controlling the blade to turn over by a fourth angle, and controlling the fan blade of the air conditioner outdoor unit to run in a low wind shield mode, wherein the second angle is more than the third angle and more than the fourth angle.

In some embodiments, the second angle = 90 °, the third angle = 70 °, the fourth angle = 50 °; and/or, the first angle = the second angle.

According to the outdoor unit grille assembly, the air conditioner outdoor unit, the air conditioner and the control method thereof, blades in the outdoor unit grille assembly can be controlled to be in a sealing state when blades of the outdoor unit are not rotated, so that the phenomenon that external rainwater, dust, insects and the like enter the outdoor unit to corrode the blades of the outdoor unit and even cause short circuit of a main board of an electric appliance box is effectively prevented, heat exchange efficiency is guaranteed when the blades rotate and are controlled to be in a through-flow state, the overturning angles of the blades can be adjusted by controlling the internal and external overturning of the blades, and the adjustment requirements of different overturning angles under different working conditions or weather conditions are met.

Drawings

Fig. 1 is a schematic view illustrating an internal structure of an outdoor unit grill assembly according to an embodiment of the present invention;

FIG. 2 is an enlarged view of a portion of FIG. 1 at A;

FIG. 3 is an axial cross-sectional schematic view of the grill body of FIG. 1;

FIG. 4 is a top view of FIG. 3;

FIG. 5 is a bottom view of the platen of FIG. 1;

FIG. 6 is a top view of the platen of FIG. 5;

FIG. 7 is a schematic view of the intermediate transmission member of FIG. 1;

FIG. 8 is a schematic diagram of the drive connection of the grill body, the main drive gear, and the blade;

FIG. 9 is a schematic view of the blade in a fully open condition, i.e., with a 90 degree flip angle;

fig. 10 is a control logic flow chart of a control method of an air conditioner in another embodiment of the present invention.

The reference numerals are expressed as:

1. a grill body; 10. a vent; 11. an annular wall; 111. a clamping groove; 112. a mating groove; 113. a main drive gear mating hole; 114. a first intermediate transmission member mating hole; 12. a pressing plate; 121. a clamping arm; 122. a second intermediate transmission member mating hole; 123. a rotary motor mounting table; 13. an outer ring; 14. a rib; 2. a blade; 21. a drive shaft; 22. a driven gear; 31. a rotary motor; 32. a main drive gear; 33. an intermediate transmission member; 331. a rotating shaft; 332. a first transmission gear; 333. and a second transmission gear.

Detailed Description

Referring to fig. 1 to 10, according to an embodiment of the present invention, there is provided an outdoor grille assembly, comprising a grille body 1, wherein the grille body 1 has a plurality of vents 10 disposed in a circumferential direction, each vent 10 is provided with a vane 2, specifically, the grille body 1 has an outer ring 13 and a plurality of ribs 14 disposed on an inner wall of the outer ring 13 at intervals along the circumferential direction of the outer ring 13, the adjacent two ribs 14 form a substantially fan-shaped vent 10 therebetween, the vanes 2 are fan-shaped in accordance with the shape of the vents 10, each vane 2 has a through-flow state allowing the through-flow of the vent 10 and a sealing state blocking the through-flow of the vent 10, the vanes 2 can be driven to be turned around a central symmetry axis thereof to switch between the through-flow state and the sealing state, the outer ring 13 is provided with a mounting hole to enable the outdoor grille assembly of the outdoor unit, the vanes 2 are turned inside and outside with respect to an inside of the outdoor unit after the grille assembly is assembled on the outdoor unit, as shown in fig. 9, and the vanes 2 are turned inside and outside the outdoor unit after the vanes 2 are driven to be partially outside. In this technical scheme, blade 2 in the off-premises station grid subassembly can be in sealed state by the control when the fan blade of off-premises station is not rotated, effectively prevents that external rainwater, dust, worm etc. from getting into the phenomenon emergence that the off-premises station fan blade from corroding even leading to electrical apparatus box mainboard short circuit in the off-premises station, and is in through-flow state assurance heat exchange efficiency by the control when the fan blade rotates then, can also form the adjustment to the flip angle of blade 2 through the inside and outside upset of control blade 2, realizes the adjustment demand of different flip angles under different operating modes or the weather condition. Specifically, the blades 2 are closed in the non-working state of the external machine, rainwater and insects are prevented from entering the external machine to protect the blades and the main board, the blades 2 are rotated to the position with the largest ventilation quantity in the high-temperature refrigeration state, the accessible air quantity is maximized, the heat dissipation efficiency is increased, when the outdoor temperature and the indoor tube temperature reach the set conditions in the low-temperature refrigeration state, the blades 2 are gradually rotated to the set closed state, the air quantity of the external machine is further reduced, meanwhile, the heat loss of the condenser is reduced, the temperature at the periphery of the condensation side is increased, the heat exchange efficiency of the external machine is reduced, and the purpose of increasing the evaporation temperature is achieved.

Referring to fig. 2, a driving shaft 21 is provided at a first end (i.e., a radially inner end) of each blade 2, a driven gear 22 is provided on the driving shaft 21, a driving device is provided in a central area of the grid body 1, and is simultaneously in driving connection with each driven gear 22, and the radially inner end of each blade 2 is simultaneously driven by the driving device provided in the central area, so that a mode of switching states of driving a plurality of blades 2 simultaneously by one driving device is adopted, thereby simplifying structural design and reducing production and manufacturing costs.

In some embodiments, the driving device includes a rotary motor 31 and a main driving gear 32 sleeved with an output shaft of the rotary motor 31, the main driving gear 32 is in driving connection with the driven gear 22 via an intermediate transmission member 33, in a specific embodiment, a central area of the grid main body 1 has a circular wall 11, an accommodating space is formed inside the circular wall 11, the circular wall 11 has an opening facing away from the side of the grid main body 1, that is, an opening position of the accommodating space, a pressing plate 12 is covered on the opening, the rotary motor 31 is assembled on a side facing away from the circular wall 11 of the pressing plate 12, specifically, a rotary motor mounting table 123 is provided on the pressing plate 12, the rotary motor 31 is assembled on the rotary motor mounting table 123, and the main driving gear 32, the intermediate transmission member 33 and the driven gear 22 are arranged inside the circular wall 11, that is, the accommodating space forms a seal for the pressing plate 12, preventing external dust and the like from forming an obstacle to tooth engagement, and the rotary motor 31 is located outside the accommodating space, so as to facilitate maintenance of the rotary motor 31.

In some embodiments, the intermediate transmission member 33 includes a rotating shaft 331, two ends of the rotating shaft 331 are rotatably supported on the pressing plate 12 and the grid main body 1 respectively, specifically, a first intermediate transmission member matching hole 114 is formed on the grid main body 1, a second intermediate transmission member matching hole is formed on the pressing plate 12, and two ends of the rotating shaft 331 are supported in the two matching holes respectively, so that reliable connection of the intermediate transmission member 33 is realized; in a preferred embodiment, the intermediate transmission member 33 further includes a first transmission gear 332 and a second transmission gear 333, where the first transmission gear 332 and the second transmission gear 333 are disposed at intervals along the axial direction of the rotating shaft 331, the first transmission gear 332 is meshed with the main driving gear 32, and the second transmission gear 333 is meshed with the driven gear 22, so that the two transmission gears are meshed with the main driving gear 32 and the driven gear 22 respectively, which is simple in structure and high in transmission efficiency; the second transmission gear 333 is located on the side of the first transmission gear 332 close to the rotary motor 31, so that the accommodating space in the annular wall 11 can be designed to be relatively thin, and the overall thickness of the grille main body 1 can also be designed to be thinner.

The driven gear 22 and the second transmission gear 333 are bevel gears, and the main driving gear 32 and the first transmission gear 332 are spur gears, so that the rotation of the rotary motor 31 is finally converted into the internal and external turning of each blade 2, and the structure is compact and simple, and the occupied space is relatively small.

In a particular embodiment, the transmission ratio between the main drive gear 32 and the first transmission gear 332 is i1, i1=2, and the transmission ratio between the second transmission gear 333 and the driven gear 22 is i2, i2=2.5.

In some embodiments, the side of the main driving gear 32 away from the rotary motor 31 has a supporting shaft rotatably supported on the grid body 1, and in particular, the grid body 1 further has a main driving gear engagement hole 113, and the side of the main driving gear 32 away from the rotary motor 31 is supported on the main driving gear engagement hole 113, so that the stability of the driving transmission can be ensured. The diameter of each gear matching hole is slightly larger than the shaft of the corresponding gear, and the clearance is recommended to be within 0.05-0.15 mm.

The clamp plate 12 has a plurality of joint arms 121 towards one side of rampart 11, have a plurality of draw-in grooves 111 that set up along its circumferencial direction interval on the rampart 11, each joint arm 121 respectively the snap-in connection in each draw-in groove 111 of one-to-one, clamp plate 12 forms detachably through a plurality of joint arms 121 and corresponding draw-in groove 111 and is connected, be convenient for assemble, specifically, each draw-in groove 111 shape is rectangle, its width is greater than clamp arm 121 width of clamp plate 12, unilateral clearance suggestion is at 0.15-0.25mm, prevent that blade from moving because friction drives clamp plate 12 rocks, clamp plate 12 is after the installation its joint arm 121 and grid main part 1 (i.e. rampart 11) interlock volume design is 1.2-1.5mm, easy to assemble and dismantle.

In some embodiments, the annular wall 11 further has a plurality of matching grooves 112 disposed at intervals along a circumferential direction thereof, each driving shaft 21 is accommodated in the matching groove 112, a notch of the matching groove 112 faces to one side of the pressing plate 12, it can be understood that each driven gear 22 is located at an inner side of the annular wall 11, the driving shaft 21 is supported by the matching groove 112, the matching groove 112 is used as a rotation fulcrum for turning inside and outside the blade 2, a gap between the matching groove 112 and the driving shaft 21 is 0.1mm-0.3mm, and lubricating oil can be smeared between the matching groove 112 and the driving shaft 21 to ensure that no jamming occurs during movement.

In some embodiments, the notch of the mating groove 112 is in a flare structure, the flare angle of the flare structure increases toward one side of the platen 12, the flare angle of the flare structure is c (single side c/2 is shown in fig. 3), 120 c 70, i.e., the single side inclination is between 60 and 70, and too large would cause the blade 2 to come out during rotation, and too small the blade 2 would be difficult to snap into during installation.

According to an embodiment of the present invention, there is also provided an outdoor unit of an air conditioner, including the above-mentioned outdoor unit grille assembly.

According to an embodiment of the present invention, there is also provided an air conditioner including the above-mentioned air conditioner outdoor unit.

According to an embodiment of the present invention, there is also provided a control method of an air conditioner, for controlling the operation of the air conditioner, including the steps of:

if the fan blades do not rotate, the control fan blades 2 are in a sealing state, so that the outdoor unit is kept in an isolated state with the outside, and the fan blades and the main board of the outdoor unit are protected from corrosion or damage;

if the fan blade rotates, the outdoor environment temperature Ty is further obtained, and according to the obtained outdoor environment temperature Ty, the turning angle of the fan blade 2 is controlled, so that the fan blade 2 is in different through-flow states.

In some embodiments, if the fan blade rotates, further obtain the outdoor environmental temperature Ty, and control the turning angle of the fan blade 2 according to the obtained outdoor environmental temperature Ty, so that the fan blade 2 is in different through-flow states specifically includes:

when Ty > T1 (t1=15 ℃ in one specific embodiment), controlling the turning first angle of the blade 2; or,

when Ty is less than or equal to T1, the air conditioner is controlled to enter a low-temperature refrigeration control mode.

When the air conditioner enters a low-temperature refrigeration control mode, the tube temperature T tube of the heat exchanger of the air conditioner indoor unit is obtained,

when the T pipe is more than T2, controlling the blade 2 to turn over a second angle; or,

when T2 is more than or equal to T3, controlling the blade 2 to turn over a third angle and controlling the blade of the outdoor unit of the air conditioner to run in a low wind shield; or,

when T3 is more than or equal to T4, the control blade 2 turns over a fourth angle and controls the fan blade of the air conditioner outdoor unit to run in a low wind shield mode, wherein the second angle is more than the third angle and more than the fourth angle, so that the matching of the tube temperature of the indoor heat exchanger and the turning angle of the outdoor blade is realized, and the refrigeration reliability and the indoor refrigeration effect are ensured. In the technical scheme, when the outdoor temperature and the indoor tube temperature reach the set conditions in the low-temperature refrigeration state, the blades 2 gradually rotate to the set closed state, so that the air quantity of the external machine is further reduced, the heat loss of the condenser is reduced, the temperature of the periphery of the condensing side is increased, the heat exchange efficiency of the external machine is reduced, and the aim of increasing the evaporating temperature is fulfilled.

In some embodiments, the second angle = 90 °, the third angle = 70 °, the fourth angle = 50 °; and/or, first angle = second angle.

The control method of the present invention is further described in connection with a specific embodiment:

as shown in figure 10 of the drawings,

judging whether the fan blade of the air conditioner external unit rotates or not, if so, carrying out the next step, otherwise, maintaining the grid in a fully-closed state mode (namely, the turning angle of the fan blade is in the 4 th grade), and protecting the fan blade and the main board from erosion;

if the rotation is performed, the outdoor environment temperature (i.e., ty) is obtained, and the outdoor environment temperature is determined, and the condition that the outdoor environment temperature is greater than 15 ℃ (i.e., T1) is satisfied? If the condition is satisfied, the outdoor grille (that is, the blade 2) maintains the 1 st stage fully opened state, the air outlet area is increased to the maximum possible extent, and if the condition is not satisfied, the low-temperature refrigeration control mode is entered.

In the low-temperature refrigeration control mode, the indoor evaporator tube temperature (i.e., the aforementioned T tube) is acquired, the indoor evaporator tube temperature is determined, and the inter-zone control is performed to ensure the reliability and the indoor refrigeration effect.

Specifically, if the T pipe is more than 0 ℃, the air conditioner operates to ensure the refrigeration effect, and the grille of the outdoor unit maintains the 1 st gear to be fully opened, so as to ensure the air output; when the temperature of the outdoor air guide grating is less than 10 ℃ below zero and less than or equal to 5 ℃ below zero, the angle of the outdoor air guide grating is adjusted to be 3 rd gear, and the external fan runs at a low wind gear; when the temperature of the T pipe is less than or equal to minus 5 ℃ and less than or equal to 0 ℃, the angle of the outdoor air guide grating is adjusted to 2 nd gear, and the external fan runs at a low wind gear. The low wind gear is rotated at full speed relative to the wind blade, the rotation speed is lower than the corresponding full speed of the wind blade, and the specific rotation speed can be set by a user.

As shown in fig. 9, the blade 2 is shown in the fully opened 1 st gear, and the angle between the blade 2 and the vertical surface is a, wherein the 1 st gear corresponds to 90 °, the 2 nd gear corresponds to 70 °, the 3 rd gear corresponds to 50 °, and the 4 th gear corresponds to 0 °, wherein the 4 th gear corresponds to the sealing state of the blade 2, and the 1 st gear to the 3 rd gear correspond to the circulation state of the blade 2.

Those skilled in the art will readily appreciate that the advantageous features of the various aspects described above may be freely combined and stacked without conflict.

The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention. The foregoing is merely a preferred embodiment of the present invention, and it should be noted that it will be apparent to those skilled in the art that modifications and variations can be made without departing from the technical principles of the present invention, and these modifications and variations should also be regarded as the scope of the invention.

Claims

1. The outdoor unit grille assembly is characterized by comprising a grille main body (1), wherein a plurality of ventilation openings (10) are formed in the grille main body (1) along the circumferential direction, each ventilation opening (10) is provided with a blade (2), each blade (2) has a through-flow state allowing the ventilation opening (10) to flow through and a sealing state cutting off the ventilation opening (10) from flowing through, and the blades (2) can be driven to turn inwards and outwards around the central symmetry axis of the blades to switch between the through-flow state and the sealing state.

2. Outdoor unit grill assembly according to claim 1, characterized in that said first end of said vane (2) has a driving shaft (21), said driving shaft (21) having a driven gear (22), said central area of said grill body (1) being provided with driving means, said driving means being simultaneously in driving connection with each of said driven gears (22).

3. The outdoor unit grill assembly according to claim 2, wherein the driving means includes a swing motor (31) and a main driving gear (32) fitted with an output shaft of the swing motor (31), the main driving gear (32) being drivingly connected with the driven gear (22) via an intermediate transmission member (33).

4. A grille assembly for an outdoor unit according to claim 3, wherein said central area of said grille body (1) has a circular wall (11), said circular wall (11) having an opening facing away from said grille body (1), said opening being covered with a pressure plate (12), said rotary motor (31) being assembled to a side of said pressure plate (12) facing away from said circular wall (11).

5. The outdoor unit grill assembly according to claim 4, wherein the intermediate transmission member (33) includes a rotation shaft (331), and both ends of the rotation shaft (331) are rotatably supported on the pressing plate (12) and the grill body (1), respectively.

6. The outdoor unit grill assembly according to claim 5, wherein the intermediate transmission member (33) further comprises a first transmission gear (332) and a second transmission gear (333), the first transmission gear (332) and the second transmission gear (333) are disposed at intervals along the axial direction of the rotation shaft (331), and the first transmission gear (332) is tooth-engaged with the main driving gear (32), and the second transmission gear (333) is tooth-engaged with the driven gear (22).

7. The outdoor unit grill assembly according to claim 6, wherein said second transmission gear (333) is located at a side of said first transmission gear (332) close to said rotary motor (31); and/or, the driven gear (22) and the second transmission gear (333) are bevel gears, and the main driving gear (32) and the first transmission gear (332) are straight gears.

8. The outdoor unit grill assembly according to claim 6, wherein a transmission ratio between the main driving gear (32) and the first transmission gear (332) is i1, i1=2, and a transmission ratio between the second transmission gear (333) and the driven gear (22) is i2, i2=2.5.

9. The outdoor unit grill assembly according to claim 4, wherein a side of the main driving gear (32) remote from the swing motor (31) has a support shaft rotatably supported on the grill body (1).

10. The outdoor grille assembly according to claim 4, wherein a plurality of engaging arms (121) are provided on a side of the pressure plate (12) facing the annular wall (11), the annular wall (11) has a plurality of engaging grooves (111) provided at intervals along a circumferential direction thereof, and each engaging arm (121) is respectively engaged with each engaging groove (111) in a one-to-one correspondence manner.

11. The outdoor unit grill assembly according to claim 4, wherein the circumferential wall (11) further has a plurality of engaging grooves (112) formed therein at intervals along a circumferential direction thereof, each of the driving shafts (21) is received in the engaging groove (112), and a notch of the engaging groove (112) faces the side of the pressure plate (12).

12. The outdoor unit grill assembly according to claim 11, wherein the notch of the mating groove (112) has a bell mouth structure, the bell mouth structure having an opening angle of c, which is 120 ° -c-70 °; and/or the clearance between the fitting groove (112) and the driving shaft (21) is 0.1mm-0.3mm.

13. An outdoor unit of an air conditioner, comprising the outdoor unit grille assembly of any one of claims 1 to 12.

14. An air conditioner comprising the outdoor unit of claim 13.

15. A control method of an air conditioner for controlling the operation of the air conditioner according to claim 14, comprising the steps of:

if the fan blade does not rotate, controlling the fan blade (2) to be in the sealing state;

if the fan blades rotate, further acquiring outdoor environment temperature Ty, and controlling the turning angle of the blades (2) according to the acquired outdoor environment temperature Ty so as to enable the blades (2) to be in different through-flow states.

16. The control method according to claim 15, wherein if the fan blade rotates, further acquiring an outdoor ambient temperature Ty, and controlling the turning angle of the blade (2) according to the acquired outdoor ambient temperature Ty, so that the blade (2) is in different through-flow states specifically includes:

when Ty is larger than T1, controlling the overturning first angle of the blade (2); or,

17. The control method according to claim 16, wherein when the air conditioner enters a low-temperature refrigeration control mode, a heat exchanger tube temperature T tube of the air conditioner indoor unit is obtained,

when the T pipe is more than T2, controlling the blade (2) to turn over a second angle; or,

when T2 is more than or equal to T3, controlling the blade (2) to turn over a third angle, and controlling the fan blade of the air conditioner outdoor unit to run in a low wind shield mode; or,

when T3 is more than or equal to T pipe > T4, controlling the blade (2) to turn over a fourth angle, and controlling the fan blade of the air conditioner outdoor unit to run in a low wind shield mode, wherein the second angle > the third angle > the fourth angle.

18. The control method according to claim 17, characterized in that the second angle = 90 °, the third angle = 70 °, and the fourth angle = 50 °; and/or, the first angle = the second angle.