Automatic heat exchanger cleaning device, air conditioner outdoor unit, air conditioner and reversing device

Abstract

The invention provides an automatic heat exchanger cleaning device, an air conditioner outdoor unit, an air conditioner and a reversing device.The automatic heat exchanger cleaning device comprises a driving motor, a screw, a sliding block assembly and a brush assembly, the driving motor is in driving connection with the screw, the sliding block assembly is installed on the screw, and the screw drives the sliding block assembly to move back and forth in the axial direction of the screw; the brush assembly is installed on the sliding block assembly. The sliding block assembly is provided with a reversing device, and the reversing device is in threaded connection with the screw. The screw rod rotates in a preset rotation direction during working, and the reversing device is used for switching the movement direction of the sliding block assembly on the screw rod when the sliding block assembly moves to the first reversing position or the second reversing position of the screw rod. The automatic cleaning device for the heat exchanger can prolong the service life of the driving motor.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioning, and in particular to a reversing device, an automatic cleaning device for a heat exchanger using the reversing device, an air conditioning outdoor unit using the automatic cleaning device for the heat exchanger, and an air conditioner using the air conditioning outdoor unit. Background Art

[0002] After an air conditioner's outdoor unit has been running for a long time, a thick layer of dust and dirt will accumulate on the surface of its internal heat exchanger and blades, which will affect the heat exchange efficiency of the refrigeration system and cause the cooling capacity to decrease. Some existing air conditioners also have a self-cleaning function, which removes dust and dirt by condensing water on the heat exchanger and causing the axial fan blades to hit the condensed water. However, the blades of the top-exhaust outdoor unit are located above the heat exchanger and cannot be cleaned with condensed water. In addition, some areas are relatively dry and condensed water is not easily generated, making the self-cleaning function impossible. Therefore, manual cleaning is still required in relatively dry areas, and some high-rise buildings are even more inconvenient to operate. Therefore, a cleaning component that can automatically clean the outdoor unit heat exchanger is needed.

[0003] An existing automatic cleaning device includes a main rotating pulley pair, a secondary rotating pulley pair, and a cleaning brush rod. The cleaning brush rod is provided with a brush and is connected to the main rotating pulley pair and the secondary rotating pulley pair. The automatic cleaning device is installed in the housing of the air conditioner outdoor unit so that when the cleaning brush rod approaches the condenser, the brush can contact the condenser surface. The present invention installs an automatic cleaning device on the air conditioner outdoor unit. The device's motor drives the brush to rotate, and the brush cleans dust attached to the condenser during movement, achieving the automatic cleaning function, thereby effectively preventing an increase in the thermal resistance of the condenser and a decrease in heat exchange efficiency, thereby ensuring reliable operation of the air conditioner.

[0004] However, in this solution, when controlling the brush to perform cleaning motion, it is necessary to continuously change the direction of the motor to achieve reciprocating motion. This method will cause great damage to the motor, thereby reducing the service life of the motor.

[0005] Therefore, a more optimized automatic cleaning device for the heat exchanger needs to be considered. Summary of the Invention

[0006] A first object of the present invention is to provide an automatic cleaning device for a heat exchanger which can prolong the service life of a driving motor.

[0007] A second object of the present invention is to provide an air conditioner outdoor unit having a heat exchanger that can increase the service life of a drive motor.

[0008] A third object of the present invention is to provide an air conditioner having a heat exchanger that can increase the service life of a drive motor.

[0009] A fourth object of the present invention is to provide a reversing device that realizes bidirectional reversal when the screw rotates in a preset rotation direction.

[0010] In order to achieve the above-mentioned first purpose, the automatic cleaning device for heat exchanger provided by the present invention includes a driving motor, a screw, a slider assembly and a brush assembly. The driving motor is connected to the screw drive, the slider assembly is installed on the screw, the screw drives the slider assembly to move back and forth along the axial direction of the screw, and the brush assembly is installed on the slider assembly; the slider assembly is provided with a reversing device, and the reversing device is threadedly connected to the screw; the screw rotates in a preset rotation direction when working, and the reversing device is used to switch the movement direction of the slider assembly on the screw when the slider assembly moves to the first reversing position or the second reversing position of the screw.

[0011] As can be seen from the above scheme, the automatic heat exchanger cleaning device of the present invention comprises a drive motor, a screw, a slider assembly, and a brush assembly. The brush assembly moves back and forth stably along the screw's axial direction, providing a precisely controllable coverage area and evenly cleaning the entire cleaning area of ​​the heat exchanger, thus avoiding omissions or incomplete cleaning during manual cleaning. Furthermore, the screw rotates in a single, preset direction, and a reversing device switches the movement direction of the slider assembly, eliminating the need for motor reversal. This avoids current shock and mechanical wear caused by frequent forward and reverse rotation of the motor, thereby extending the service life of the motor and transmission system.

[0012] In a further scheme, the reversing device includes a first nut assembly and a second nut assembly, and the nut thread rotation direction of the first nut assembly is set opposite to the nut thread rotation direction of the second nut assembly; when the slider assembly moves from the first reversing position to the second reversing position, the first nut assembly is threadedly connected to the screw rod, and the second nut assembly is separated from the screw rod; when the slider assembly moves from the second reversing position to the first reversing position, the first nut assembly is separated from the screw rod, and the second nut assembly is threadedly connected to the screw rod.

[0013] As can be seen, reversal is achieved by switching the thread rotation direction difference and meshing state of the first and second nut assemblies. This eliminates the need for electronic components such as sensors and controllers, and can adapt to harsh environments such as high temperature, high humidity, high dust, and strong vibration, avoiding cleaning interruptions caused by electronic component failure. When the slider assembly moves to the first or second reversing position, the meshing state of the nut assembly and the screw is switched, resulting in a simple and direct triggering logic, which prevents reversal deviations caused by signal delays, program errors, and other issues.

[0014] In a further solution, the first nut assembly includes at least two first nut blocks, the first nut blocks are provided with a threaded portion, and the threaded portions of all first nut blocks cooperate to form a first screw hole that cooperates with the screw rod, and the size of the first screw hole can be adjusted; the second nut assembly includes at least two second nut blocks, the second nut blocks are provided with a threaded portion, and the threaded portions of all second nut blocks cooperate to form a second screw hole that cooperates with the screw rod, and the size of the second screw hole can be adjusted.

[0015] It can be seen that when the slider assembly moves to the reversing position, the split nut block can flexibly adjust the size of the screw hole through mechanical triggering, so that the first nut assembly and the second nut assembly can realize the enlargement of the screw hole and separation from the screw rod by opening the nut block when reversing, or the shrinkage of the screw hole and engagement with the screw rod by closing the nut block.

[0016] In a further solution, two adjacent first nut blocks are connected via a first elastic member; and two adjacent second nut blocks are connected via a second elastic member.

[0017] It can be seen that the first nut blocks are connected by the first elastic member, and the second nut blocks are connected by the second elastic member. The elastic member can make the spacing between the nut blocks elastically adjustable, and can provide a stable driving force for the opening and closing of the nut blocks, ensuring the reliability of the engagement or separation action. At the same time, the elastic member has good buffering and shock absorbing performance, which can absorb the instantaneous impact force of the nut block when switching between opening and closing.

[0018] In a further scheme, the reversing device also includes a slider box and a nut limiting assembly, and the nut limiting assembly is movably installed in the accommodating cavity of the slider box along the axial direction of the screw; the nut limiting assembly is provided with a nut accommodating cavity, and the first nut assembly and the second nut assembly are both movably installed in the nut accommodating cavity along the axial direction of the screw, and the first nut assembly and the second nut assembly are arranged in sequence along the direction from the first reversing position to the second reversing position; the first nut assembly and the second nut assembly are both arranged in a truncated cone shape; in the direction from the first reversing position to the second reversing position of the screw, the diameter of the second nut assembly gradually decreases; in the direction from the second reversing position to the first reversing position of the screw, the diameter of the first nut assembly gradually decreases; an upper spring buckle and a lower spring buckle are provided in the nut accommodating cavity, a first card groove is provided on the outer peripheral wall of the first nut assembly, and a second card groove is provided on the outer peripheral wall of the second nut assembly, the first card groove is matched with the upper spring buckle, and the second card groove is matched with the lower spring buckle.

[0019] As can be seen, the first and second nut assemblies are truncated cone-shaped, and the direction of diameter change matches the direction of movement, forming a wedge-shaped guide structure with the upper and lower spring clips. When the slider assembly moves to the reversing position, the truncated cone-shaped outer wall of one nut assembly will gradually contact the spring clip, forcing the nut assembly to move toward the axis of the screw through the inclined surface guidance, thereby engaging the nut assembly with the screw, and the other nut assembly will be separated from the screw under the action of the elastic member. At the same time, the upper spring clip cooperates with the first slot and the lower spring clip cooperates with the second slot. When the first nut assembly is engaged with the screw, the upper spring clip engages with the first slot, locking it in the engaged position to prevent accidental separation due to vibration or resistance fluctuations. At this time, the second slot separates from the lower spring clip. When reversing, the first slot separates from the upper spring clip, and the lower spring clip engages with the second slot under the action of the elastic force to achieve a new lock.

[0020] In a further solution, a first limiting column is provided at the top of the nut limiting assembly, and a second limiting column is provided at the bottom of the nut limiting assembly; a first limiting hole is provided at the top of the slider box, and a second limiting hole is provided at the bottom of the slider box; a part of the first limiting column passes through the accommodating cavity of the slider box through the first limiting hole, and a part of the second limiting column passes through the accommodating cavity of the slider box through the second limiting hole.

[0021] It can be seen that the nut limiting assembly moves along the axial direction of the screw in the slider box, and the cooperation between the first limiting column and the first limiting hole, and the second limiting column and the second limiting hole forms a rigid constraint on the axial displacement. The limiting column passing through the limiting hole can be used to cooperate with an external blocking member to trigger reversing.

[0022] In a further solution, a portion of the first limiting column located in the accommodating cavity is covered with a first compression spring; a portion of the second limiting column located in the accommodating cavity is covered with a second compression spring.

[0023] It can be seen that by providing the first compression spring and the second compression spring, rigid collision can be reduced and the service life can be guaranteed.

[0024] In a further solution, the heat exchanger automatic cleaning device further includes a base, a bearing member is mounted on the base, and an end of the screw away from the end connected to the drive motor is connected to the bearing member.

[0025] It can be seen that by providing a bearing member connected to the screw, the jamming of the screw during rotation can be reduced and the stability of the screw rotation can be improved.

[0026] In order to achieve the second purpose of the present invention, the air conditioner outdoor unit provided by the present invention includes a heat exchanger, and a heat exchanger automatic cleaning device is installed on the periphery of the heat exchanger, and the heat exchanger automatic cleaning device applies the above-mentioned heat exchanger automatic cleaning device.

[0027] In a further solution, air pressure detection devices are provided on both the air inlet side and the air outlet side of the heat exchanger.

[0028] It can be seen that by arranging air pressure detection devices on both the air inlet and air outlet sides of the heat exchanger, it can be used to detect the air pressure difference between the air inlet and air outlet sides of the heat exchanger, thereby determining whether dirt blockage occurs, and then driving the automatic cleaning device of the heat exchanger to work.

[0029] In order to achieve the third purpose of the present invention, the air conditioner provided by the present invention includes an air conditioner indoor unit and an air conditioner outdoor unit. The air conditioner indoor unit and the air conditioner outdoor unit form a heat exchange circuit, and the air conditioner outdoor unit applies the above-mentioned air conditioner outdoor unit.

[0030] In order to achieve the fourth purpose of the present invention, the reversing device provided by the present invention includes a first nut assembly and a second nut assembly, and the nut thread rotation direction of the first nut assembly is set opposite to the nut thread rotation direction of the second nut assembly; the first nut assembly includes at least two first nut blocks, the first nut blocks are provided with a threaded portion, and the threaded portions of all first nut blocks cooperate to form a first screw hole that cooperates with the screw rod, and the size of the first screw hole can be adjusted; the second nut assembly includes at least two second nut blocks, the second nut blocks are provided with a threaded portion, and the threaded portions of all second nut blocks cooperate to form a second screw hole that cooperates with the screw rod, and the size of the second screw hole can be adjusted; the adjacent two first nut blocks are connected by a first elastic member; the adjacent two second nut blocks are connected by a second elastic member; when the reversing device moves along the first direction, the first nut assembly is threadedly connected to the screw rod, and the second nut assembly is separated from the screw rod; when the reversing device moves along the second direction, the first nut assembly is separated from the screw rod, and the second nut assembly is threadedly connected to the screw rod.

[0031] Thus, the reversing device of the present invention comprises a first nut assembly and a second nut assembly. When the reversing device moves in a first direction, the first nut assembly is threadedly engaged with the screw and the second nut assembly is separated from the screw. When the reversing device moves in a second direction, the first nut assembly is separated from the screw and the second nut assembly is threadedly engaged with the screw. Reversing is achieved by utilizing the difference in thread rotation direction and the switching of the meshing state between the first and second nut assemblies, thereby achieving bidirectional reversal when the screw rotates in a predetermined direction. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is a diagram of the installation structure of the heat exchanger and the automatic cleaning device of the heat exchanger in the embodiment of the air conditioner outdoor unit of the present invention.

[0033] Figure 2 It is a structural exploded view of the automatic cleaning device of the heat exchanger in the embodiment of the air conditioner outdoor unit of the present invention.

[0034] Figure 3 It is a structural cross-sectional view of the automatic cleaning device of the heat exchanger in a moving state in an embodiment of the air-conditioning outdoor unit of the present invention.

[0035] Figure 4 It is a structural diagram of the first nut assembly in an embodiment of an air conditioner outdoor unit of the present invention.

[0036] Figure 5 1 is a structural diagram of the second nut assembly in an embodiment of an air conditioner outdoor unit of the present invention.

[0037] Figure 6 It is a structural diagram of the nut limiting assembly in an embodiment of the air conditioner outdoor unit of the present invention.

[0038] Figure 7 It is a structural diagram of the nut limiting component in the embodiment of the air conditioner outdoor unit of the present invention.

[0039] Figure 8 1 is a structural diagram of a slider box in an embodiment of an air conditioner outdoor unit of the present invention.

[0040] Figure 9 It is a structural cross-sectional view of the automatic cleaning device of the heat exchanger in another moving state in an embodiment of the air-conditioning outdoor unit of the present invention.

[0041] Figure 10 Schematic diagram of the installation position of the air pressure detection device and the heat exchanger in the embodiment of the air conditioner outdoor unit of the present invention.

[0042] The present invention will be further described below with reference to the accompanying drawings and embodiments. DETAILED DESCRIPTION

[0043] Air conditioner outdoor unit example:

[0044] like Figure 1 As shown, in this embodiment, the air-conditioning outdoor unit includes a heat exchanger 1 , and a heat exchanger automatic cleaning device 2 is installed on the periphery of the heat exchanger 1 , and the heat exchanger automatic cleaning device 2 is used to clean the heat exchanger 1 from dust.

[0045] See also Figure 2 and Figure 3 In this embodiment, the heat exchanger automatic cleaning device 2 includes a drive motor 21, a screw 22, a slider assembly 23 and a brush assembly 24. The drive motor 21 is driven and connected to the screw 22. The slider assembly 23 is installed on the screw 22. The screw 22 drives the slider assembly 23 to move back and forth along the axial direction of the screw 22. The brush assembly 24 is installed on the slider assembly 23.

[0046] In this embodiment, the slider assembly 23 is provided with a reversing device 231, a slider box 232, and a nut stop assembly 233. The reversing device 231 is threadedly connected to the screw 22. The screw 22 rotates in a predetermined direction during operation. The reversing device 231 is used to switch the movement direction of the slider assembly 23 on the screw 22 when the slider assembly 23 moves to the first reversing position or the second reversing position of the screw 22.

[0047] The reversing device 231 includes a first nut assembly 2311 and a second nut assembly 2312. The nut thread rotation direction of the first nut assembly 2311 is opposite to that of the second nut assembly 2312. When the slider assembly 23 moves from the first reversing position to the second reversing position, that is, when moving in the first direction, the first nut assembly 2311 is threadedly engaged with the screw rod 22, and the second nut assembly 2312 is separated from the screw rod 22. When the slider assembly 23 moves from the second reversing position to the first reversing position, that is, when moving in the second direction, the first nut assembly 2311 is separated from the screw rod 22, and the second nut assembly 2312 is threadedly engaged with the screw rod 22. Reversing is achieved by switching the thread rotation direction difference and meshing state of the first and second nut assemblies 2311 and 2312, eliminating the need for electronic components such as sensors and controllers. The device can adapt to harsh environments such as high temperature, high humidity, high dust, and strong vibration, and avoids cleaning interruptions caused by electronic component failure. When the slider assembly 23 moves to the first reversing position or the second reversing position, the triggering logic is simple and direct by switching the meshing state of the nut assembly and the screw 22, and there will be no reversing deviation due to problems such as signal delay and program errors.

[0048] See also Figure 4 In this embodiment, the first nut assembly 2311 includes at least two first nut blocks 23111, each of which is provided with a first threaded portion 23112. The first threaded portions 23112 of all first nut blocks 23111 cooperate to form a first screw hole 23113 that engages with the screw rod 22. The size of the first screw hole 23113 is adjustable. Adjacent first nut blocks 23111 are connected by a first elastic member 23114. Preferably, the first elastic member 23114 is a spring.

[0049] See also Figure 5 In this embodiment, the second nut assembly 2312 includes at least two second nut blocks 23121, each of which is provided with a second threaded portion 23122. The second threaded portions 23122 of all second nut blocks 23121 cooperate to form a second screw hole 23123 that engages with the screw rod 22. The size of the second screw hole 23123 is adjustable. Adjacent second nut blocks 23121 are connected by a second elastic member 23124. Preferably, the second elastic member 23124 is a spring.

[0050] When the slider assembly 23 moves to the reversing position, the split nut block can flexibly adjust the size of the screw hole through mechanical triggering, so that the first nut assembly 2311 and the second nut assembly 2312 can realize the following when reversing: the nut block opens to enlarge the screw hole and separates from the screw rod 22, or closes to reduce the screw hole and engage with the screw rod 22. The first nut blocks 23111 are connected by a first elastic member 23114, and the second nut blocks 23121 are connected by a second elastic member 23124. The elastic members can make the spacing between the nut blocks elastically adjustable and provide a stable driving force for the opening and closing of the nut blocks, ensuring the reliability of the engagement or separation action. At the same time, the elastic members have excellent cushioning and shock absorption properties, which can absorb the instantaneous impact force when the nut blocks are switched between opening and closing.

[0051] In this embodiment, the nut limiting assembly 233 is movably mounted in the accommodating cavity 2321 of the slider box 232 along the axial direction of the screw rod 22. The nut limiting assembly 233 is provided with a nut accommodating cavity 2331. The first nut assembly 2311 and the second nut assembly 2312 are both movably mounted in the nut accommodating cavity 2331 along the axial direction of the screw rod 22. The first nut assembly 2311 and the second nut assembly 2312 are arranged in sequence along the direction from the first reversing position to the second reversing position. The first nut assembly 2311 and the second nut assembly 2312 are both arranged in a truncated cone shape. In the direction from the first reversing position to the second reversing position of the screw rod 22, the diameter of the second nut assembly 2312 gradually decreases. In the direction from the second reversing position to the first reversing position of the screw rod 22, the diameter of the first nut assembly 2311 gradually decreases.

[0052] An upper snap 2332 and a lower snap 2333 are provided within the nut accommodating cavity 2331. A first latching slot 23115 is provided on the outer circumferential wall of the first nut assembly 2311, and a second latching slot 23125 is provided on the outer circumferential wall of the second nut assembly 2312. The first latching slot 23115 cooperates with the upper snap 2332, while the second latching slot 23125 cooperates with the lower snap 2333. In this embodiment, each first nut block 23111 is provided with a first latching slot 23115, and each second nut block 23121 is provided with a second latching slot 23125. The number of upper snaps 2332 is equal to the number of first latching slots 23115, and the number of lower snaps 2333 is equal to the number of second latching slots 23125. The first and second nut assemblies 2311 and 2312 are truncated cone-shaped, with their diameters changing in the direction of motion. Together with the upper and lower spring catches 2332 and 2333, they form a wedge-shaped guide structure. When the slider assembly 23 moves to the reversing position, the truncated cone-shaped outer wall of one nut assembly progressively contacts the spring catch, forcing it toward the axis of the screw rod 22 through the inclined guide surface, thereby engaging the nut assembly with the screw rod 22. The other nut assembly, under the force of the elastic member, disengages from the screw rod 22. Simultaneously, the upper spring catch 2332 engages with the first retaining groove 23115, while the lower spring catch 2333 engages with the second retaining groove 23125. When the first nut assembly 2311 engages the screw rod 22, the upper spring catch 2332 snaps into the first retaining groove 23115, locking them in the engaged position and preventing accidental separation due to vibration or resistance fluctuations. At this point, the second retaining groove 23125 disengages from the lower spring catch 2333. When reversing, the first latching slot 23115 separates from the upper spring buckle 2332 , and at the same time, the lower spring buckle 2333 is snapped into the second latching slot 23125 under the action of elastic force, thereby achieving a new locking.

[0053] See also Figure 6 In this embodiment, the nut limiting assembly 233 includes two nut limiting members 2334, and the two nut limiting members 2334 cooperate to form a nut receiving cavity 2331. Figure 7 Each nut limiting member 2334 is provided with an upper spring buckle 2332 and a lower spring buckle 2333 .

[0054] The upper snap 2332 includes an upper snap arm 23321 and a first protrusion 23322. The first end of the upper snap arm 23321 is located in the middle of the nut stopper 2334. The upper snap arm 23321 extends upward from the middle of the nut stopper 2334 at an angle. The upper snap arm 23321 is arranged parallel to the outer peripheral wall of the first nut assembly 2311. The first protrusion 23322 is located at the second end of the upper snap arm 23321 and engages with the first engaging groove 23115.

[0055] The lower snap lock 2333 includes a lower snap lock arm 23331 and a second protrusion 23332. The first end of the lower snap lock arm 23331 is located in the middle of the nut stopper 2334. The lower snap lock arm 23331 extends downward from the middle of the nut stopper 2334 and is arranged parallel to the outer peripheral wall of the second nut assembly 2312. The second protrusion 23332 is located at the second end of the lower snap lock arm 23331 and engages with the second engaging groove 23125.

[0056] The upper spring buckle 2332 and the lower spring buckle 2333 cooperate to form an accommodating position for accommodating the first nut assembly 2311 and the second nut assembly 2312, so that when the first nut assembly 2311 or the second nut assembly 2312 retracts to the accommodating position, there is enough space to separate from the screw rod 22.

[0057] Each nut limiter 2334 is located on one side of the nut accommodating cavity 2331 and is provided with a first wedge surface 2337 and a second wedge surface 2338. The first wedge surface 2337 is arranged parallel to the outer peripheral wall of the first nut assembly 2311, and the second wedge surface 2338 is arranged parallel to the outer peripheral wall of the second nut assembly 2312.

[0058] The top of the nut limiting assembly 233 is provided with a first limiting column 2335, and the bottom of the nut limiting assembly 233 is provided with a second limiting column 2336. Figure 2 It can be seen that a box cover 2322 is provided on the top of the slider box 232. The box cover 2322 is detachably mounted on the slider box 232. The box cover 2322 is provided with a first limiting hole 23221. Figure 8 The bottom of the slider box 232 is provided with a second limiting hole 2323. A portion of the first limiting post 2335 extends through the first limiting hole 23221 and out of the accommodating cavity 2321 of the slider box 232. A portion of the second limiting post 2336 extends through the second limiting hole 2323 and out of the accommodating cavity 2321 of the slider box 232. The nut limiting assembly 233 moves axially within the slider box 232 along the screw rod 22. The first limiting post 2335 cooperates with the first limiting hole 23221, and the second limiting post 2336 cooperates with the second limiting hole 2323 to form a rigid constraint on axial displacement.

[0059] Depend on Figure 2 and Figure 3 As can be seen, in this embodiment, the portion of the first limiting post 2335 located in the accommodating cavity 2321 is fitted with a first compression spring 234, and the portion of the second limiting post 2336 located in the accommodating cavity 2321 is fitted with a second compression spring 235. The provision of the first compression spring 234 and the second compression spring 235 can reduce rigidity collisions and ensure service life.

[0060] The slider box 232 is further provided with a connecting bracket 27, on which the brush assembly 24 is mounted. The shape of the brush assembly 24 can be set according to the shape of the outer peripheral wall of the heat exchanger 1. The number of brush assemblies 24 can be set as needed. In this embodiment, the number of brush assemblies 24 is four.

[0061] In addition, the automatic heat exchanger cleaning device 2 also includes a base 25, on which a bearing 26 is mounted. The end of the screw 22 that is away from the drive motor 21 is connected to the bearing 26. By providing the bearing 26 and connecting it to the screw 22, the screw 22 can reduce the jamming during rotation and improve the stability of the rotation of the screw 22.

[0062] In this embodiment, see Figure 9 Air pressure detection devices 3 are provided on both the air inlet and air outlet sides of the heat exchanger 1. The air pressure detection devices 3 are provided on both the air inlet and air outlet sides of the heat exchanger 1 to detect the air pressure difference between the air inlet and air outlet sides of the heat exchanger 1, thereby determining whether dirt blockage has occurred and driving the heat exchanger automatic cleaning device 2 to operate.

[0063] When the heat exchanger automatic cleaning device 2 of this embodiment is working, the air pressure detection device 3 works to detect the air pressure difference ΔP between the air inlet and air outlet sides of the heat exchanger 1. When the air pressure difference ΔP confirms that the heat exchanger 1 is dirty or blocked, the heat exchanger automatic cleaning device 2 starts cleaning, and the drive motor 21 starts to drive the screw 22 to rotate counterclockwise. At this time, the first nut assembly 2311 is screwed into the screw 22, as shown in FIG. Figure 3 state. The first nut assembly 2311 moves downward, thereby driving the brush assembly 24 to move downward together, and the bristles on the brush assembly 24 clean the dust and other foreign matter on the heat exchanger 1. When the slider assembly 23 moves to the lowermost end of the screw 22, it is in the second reversing position, the base supports the second limiting column 2336, and the nut limiting assembly 233 moves upward, that is, the upper spring buckle 2332 of the nut limiting assembly 233 is separated from the first card groove 23115 of the first nut assembly 2311, and the lower spring buckle 2333 cooperates with the second card groove 23125 of the second nut assembly 2312. The first nut assembly 2311 is separated under the action of the first elastic member 23114, and the second nut assembly 2312 is screwed into the screw 22 under the action of the nut limiting assembly 233. At this time, the state is as follows: Figure 10 As shown. Under the action of the second nut assembly 2312, the brush assembly 24 is driven to move upward. Similarly, when the slider assembly 23 moves to the uppermost end of the screw 22, it is in the first reversing position. The top seat 28 presses against the first limiting column 2335, and the nut limiting assembly 233 moves downward, completing the separation of the second nut assembly 2312 from the screw 22 and the screw engagement of the first nut assembly 2311 with the screw 22. This action is repeated, that is, the brush assembly 24 repeatedly moves up and down to clean the heat exchanger 1. After the heat exchanger 1 is clean, the heat exchanger automatic cleaning device 2 stops cleaning.

[0064] As can be seen from the above scheme, the automatic heat exchanger cleaning device 2 of the present invention comprises a drive motor 21, a screw 22, a slider assembly 23, and a brush assembly 24. The brush assembly 24 moves back and forth stably along the axis of the screw 22 along with the slider assembly 23, providing a precisely controllable coverage area and evenly cleaning the entire cleaning area of ​​the heat exchanger 1, thus avoiding omissions or incomplete cleaning of parts during manual cleaning. Furthermore, the screw 22 rotates in a single, preset direction, and the direction of movement of the slider assembly 23 is switched by a reversing device 231, eliminating the need for motor reversal. This avoids current shocks and mechanical wear caused by frequent forward and reverse rotation of the motor, thereby extending the service life of the motor and transmission system.

[0065] Air conditioner embodiment:

[0066] In this embodiment, the air conditioner includes an indoor air conditioner and an outdoor air conditioner. The indoor air conditioner and the outdoor air conditioner form a heat exchange loop. The outdoor air conditioner is the above-mentioned outdoor air conditioner.

[0067] It should be noted that the above are only preferred embodiments of the present invention, but the design concept of the invention is not limited thereto. Any non-substantial modifications made to the present invention using this concept also fall within the scope of protection of the present invention.

Claims

1. An automatic cleaning device for a heat exchanger, characterized in that: It includes a driving motor, a screw, a slider assembly and a brush assembly, wherein the driving motor is drivingly connected to the screw, the slider assembly is installed on the screw, the screw drives the slider assembly to move back and forth along the axial direction of the screw, and the brush assembly is installed on the slider assembly; The slider assembly is provided with a reversing device, and the reversing device is screwed to the screw; The screw rotates in a preset rotation direction during operation, and the reversing device is used to switch the movement direction of the slider assembly on the screw when the slider assembly moves to the first reversing position or the second reversing position of the screw.

2. The automatic cleaning device for heat exchanger according to claim 1, characterized in that: The reversing device includes a first nut assembly and a second nut assembly, wherein the nut thread rotation direction of the first nut assembly is opposite to the nut thread rotation direction of the second nut assembly; When the slider assembly moves from the first reversing position to the second reversing position, the first nut assembly is threadedly connected to the screw rod, and the second nut assembly is separated from the screw rod; When the slider assembly moves from the second reversing position to the first reversing position, the first nut assembly is separated from the screw rod, and the second nut assembly is threadedly connected to the screw rod.

3. The automatic cleaning device for heat exchanger according to claim 2, characterized in that: The first nut assembly includes at least two first nut blocks, each of which is provided with a threaded portion. The threaded portions of all the first nut blocks cooperate to form a first screw hole that cooperates with the screw rod, and the size of the first screw hole is adjustable. The second nut assembly includes at least two second nut blocks, each of which is provided with a threaded portion. The threaded portions of all the second nut blocks cooperate to form a second screw hole that cooperates with the screw rod, and the size of the second screw hole is adjustable.

4. The automatic cleaning device for heat exchanger according to claim 3, characterized in that: Two adjacent first nut blocks are connected via a first elastic member; Two adjacent second nut blocks are connected via a second elastic member.

5. The automatic cleaning device for heat exchanger according to claim 3, characterized in that: The reversing device further comprises a slider box and a nut limiting assembly, wherein the nut limiting assembly is movably installed in the accommodating cavity of the slider box along the axial direction of the screw; The nut limiting assembly is provided with a nut accommodating cavity, the first nut assembly and the second nut assembly are both movably installed in the nut accommodating cavity along the axial direction of the screw, and the first nut assembly and the second nut assembly are arranged in sequence along the direction from the first reversing position to the second reversing position; The first nut assembly and the second nut assembly are both arranged in a truncated cone shape; In the direction from the first reversing position to the second reversing position of the screw, the diameter of the second nut assembly gradually decreases; In the direction from the second reversing position to the first reversing position of the screw, the diameter of the first nut assembly gradually decreases; An upper spring buckle and a lower spring buckle are provided in the nut accommodating cavity, a first clamping groove is provided on the outer peripheral wall of the first nut assembly, and a second clamping groove is provided on the outer peripheral wall of the second nut assembly. The first clamping groove is matched with the upper spring buckle, and the second clamping groove is matched with the lower spring buckle.

6. The automatic cleaning device for heat exchanger according to claim 5, characterized in that: A first guide column is provided on the top of the nut limiting assembly, and a second guide column is provided on the bottom of the nut limiting assembly; The top of the slider box is provided with a first guide hole, and the bottom of the slider box is provided with a second guide hole; A portion of the first guide post passes through the first guide hole and out of the accommodating cavity of the slider box, and a portion of the second guide post passes through the second guide hole and out of the accommodating cavity of the slider box.

7. The automatic cleaning device for heat exchanger according to claim 6, characterized in that: The portion of the first guide column located in the accommodating cavity is sleeved with a first compression spring; A second compression spring is sleeved on a portion of the second guide post located in the accommodating cavity.

8. The automatic cleaning device for a heat exchanger according to any one of claims 1 to 7, characterized in that: The heat exchanger automatic cleaning device further comprises a base, a bearing member is mounted on the base, and the end of the screw rod away from the end connected to the drive motor is connected to the bearing member.

9. An air conditioner outdoor unit, comprising a heat exchanger, wherein an automatic heat exchanger cleaning device is installed on the periphery of the heat exchanger, characterized in that: The automatic cleaning device for a heat exchanger adopts the automatic cleaning device for a heat exchanger according to any one of claims 1 to 8.

10. The air conditioner outdoor unit according to claim 9, characterized in that: Air pressure detection devices are provided on both the air inlet side and the air outlet side of the heat exchanger.

11. An air conditioner comprising an indoor unit and an outdoor unit, wherein the indoor unit and the outdoor unit form a heat exchange circuit, wherein: The air-conditioning outdoor unit applies the air-conditioning outdoor unit according to claim 9 or 10.

12. A reversing device, characterized in that: The invention comprises a first nut assembly and a second nut assembly, wherein the nut thread rotation direction of the first nut assembly is opposite to the nut thread rotation direction of the second nut assembly; The first nut assembly includes at least two first nut blocks, each of which is provided with a threaded portion. The threaded portions of all the first nut blocks cooperate to form a first screw hole that cooperates with the screw rod, and the size of the first screw hole is adjustable. The second nut assembly includes at least two second nut blocks, each of which is provided with a threaded portion. The threaded portions of all the second nut blocks cooperate to form a second screw hole that cooperates with the screw rod, and the size of the second screw hole is adjustable. Two adjacent first nut blocks are connected via a first elastic member; Two adjacent second nut blocks are connected via a second elastic member; When the reversing device moves in a first direction, the first nut assembly is threadedly connected to the screw rod, and the second nut assembly is separated from the screw rod; When the reversing device moves along the second direction, the first nut assembly is separated from the screw rod, and the second nut assembly is threadedly connected to the screw rod.

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