Air conditioner

Abstract

The utility model discloses an air conditioner which comprises a water pan, a water inlet pipe and a water outlet pipe, the drainage pump is provided with a drainage motor, a pump shell and an impeller, and the impeller comprises a central shaft part, a disc surrounding the axis, a plurality of first blades which are radioactive outwards from the axis and a plurality of second blades; at least one flow guide plate is arranged on at least one second blade and extends from bottom to top in the reverse direction of rotation of the impeller. At least one blade is arranged at the bottom, extending out of the water outlet, of the second blade, all the blades are arranged on the rotating plane of the impeller in a radial mode from the axis to the periphery, and the cutting edge faces the rotating direction of the impeller; the water pump driving unit is used for driving the drainage pump to operate; and the main control unit is connected with the water pump driving unit. When the draining pump works, the draining efficiency can be improved, foreign matters in condensed water are cut and crushed through the blade, and the draining pump is prevented from being blocked.

Description

Technical Field

[0001] The utility model relates to the technical field of drainage pump drainage, in particular to an air conditioner. Background Art

[0002] In the related art, when the air conditioner is in cooling mode, water vapor in the air hits the low-temperature evaporator, forming condensed water and flowing into the water receiving tray of the indoor unit. In the process of condensed water generation, impurities such as lint, dust, and hair in the low-temperature evaporator and the air are collected in the water receiving tray. The condensed water is discharged from the water receiving tray to the outside through a drain pipe using a drainage pump.

[0003] As these impurities accumulate in the water tray for a long time, more and more impurities will be adsorbed and precipitated in the water tray, causing the water tray to be abnormally dirty. At the same time, since the drain pump is set in the water tray, drainage blockage is likely to occur when the drain pump is used for drainage, and the drainage capacity becomes poor and the head is reduced. In the worst case, the drain pump is completely blocked and cannot drain normally.

[0004] The above information disclosed in the background technology is only used to increase the understanding of the background technology of the present application, and therefore, it may include information that does not constitute the prior art known to ordinary technicians in the field. Utility Model Content

[0005] In response to the problems pointed out in the background technology, the air conditioner involved in the present application is provided with a guide plate on the drainage pump impeller and a blade at the bottom of the impeller. The guide plate enhances the lifting effect of the water flow during the operation of the water pump, thereby improving the drainage efficiency. The blade can cut and crush foreign matter in the condensed water during the operation of the drainage pump to prevent clogging of the drainage pump.

[0006] In order to achieve the above-mentioned utility model purpose, the utility model adopts the following technical solutions:

[0007] An embodiment of the present application provides an air conditioner, comprising:

[0008] A water receiving tray, which is used to receive condensed water generated during the cooling operation of the air conditioner;

[0009] A drainage pump, which is installed in the water receiving pan, comprises a drainage motor, a pump casing and an impeller, wherein the impeller is arranged in the pump casing, a water inlet is arranged at the bottom of the pump casing and a drainage outlet is arranged at the side, wherein the impeller comprises a central axis, a disc surrounding the axis, a plurality of first blades radiating outward from the axis, and a plurality of second blades, wherein the central axis is connected to the output shaft of the drainage motor, the first blades are connected to the central axis and the disc, the second blades are connected to the first blades and extend out of the drainage outlet away from the central axis along the axial direction of the central axis; the water inlet is communicated with the water receiving pan, and the drainage outlet is used to discharge the condensed water in the water receiving pan to the outside when the drainage pump is working;

[0010] At least one guide plate is respectively arranged on each of the second blades, and the guide plate extends from bottom to top in the reverse direction of the rotation of the impeller;

[0011] At least one blade is arranged on the bottom of the second blade extending out of the drain port, and each blade is radially arranged from the axis to the surroundings on the rotation plane of the impeller, and the blade faces the rotation direction of the impeller;

[0012] A water pump driving unit, which is used to drive the drainage pump to operate;

[0013] A main control unit is connected to the water pump driving unit.

[0014] The air conditioner involved in the present application is provided with a guide plate on the blades of the drainage pump impeller, which is used to improve the drainage capacity during the operation of the drainage pump, thereby improving the drainage efficiency.

[0015] A blade is arranged at the bottom of the impeller of the drainage pump, and the blade is driven to rotate when the drainage pump rotates to cut and crush foreign matter in the water receiving tray. The cut and crushed foreign matter reduces the risk of clogging the drainage pump, which is conducive to reliable drainage of the drainage pump.

[0016] In some embodiments of the present application, a plurality of spaced guide plates are respectively provided on each of the second blades;

[0017] The extension degree of each guide plate from bottom to top is the same.

[0018] The multiple spaced guide plates can enhance the water flow lifting effect.

[0019] In some embodiments of the present application, the guide plate is in the shape of a flat plate, and providing a flat plate-shaped guide plate reduces manufacturing costs.

[0020] In some embodiments of the present application, the guide plate may also be in the shape of a spiral surface.

[0021] In some embodiments of the present application, each of the second blades is a planar plate-shaped blade distributed along the axial direction of the central axis and connected to each other, and is radially arranged from the axis to the surroundings;

[0022] The plurality of guide plates on the second blade are located on the outermost surface of the second blade.

[0023] The multiple guide plates on each second blade are arranged on the outermost side of the second blade, which is beneficial to lifting the water flow during the operation of the drainage pump.

[0024] In some embodiments of the present application, the number of guide plates on each second blade is the same and multiple;

[0025] The arrangement of the plurality of guide plates on each second blade is the same.

[0026] The guide plates arranged in the same manner can evenly lift the water during the operation of the drainage pump, thereby improving the reliability of the operation of the drainage pump.

[0027] In some embodiments of the present application, the number of the blades is multiple;

[0028] A plurality of blades are evenly and radially arranged from the axis to the surrounding areas on the rotating plane of the impeller.

[0029] The evenly arranged multiple blades can fully cut and crush foreign matter around the water inlet when the drainage pump rotates, ensuring smooth drainage of the drainage pump.

[0030] In some embodiments of the present application, each of the second blades is a planar plate-shaped blade distributed along the axial direction of the central axis and connected to each other, and is evenly radially arranged from the axis to the surroundings;

[0031] A blade is disposed at the bottom of each of the plurality of second blades.

[0032] Each second blade is correspondingly provided with a blade, which facilitates the arrangement of the blades on the structure.

[0033] In some embodiments of the present application, the water pump driving unit includes:

[0034] A water pump driving chip, the signal output by the speed feedback pin of which is fed back to the main control unit, for real-time detection of the speed of the drainage pump;

[0035] An overcurrent protection circuit is disposed on the periphery of the water pump driving chip to provide overcurrent protection for the drainage pump motor.

[0036] In some embodiments of the present application, the water pump driving chip has a first pin, a second pin and a third pin, and the overcurrent protection circuit is connected between the first pin, the second pin and the third pin;

[0037] The overcurrent protection circuit includes a first resistor, a second resistor and a third resistor, the first pin is grounded through the first resistor, the second pin is grounded through the second resistor, the third pin is connected to one end of the third resistor, and the other end of the third resistor is connected to the connection point between the second resistor and the second pin.

[0038] The present application also relates to an air conditioner, comprising:

[0039] A water receiving tray, which is used to receive condensed water generated during the cooling operation of the air conditioner;

[0040] A drainage pump, which is installed in the water receiving pan, comprises a drainage motor, a pump casing and an impeller, wherein the impeller is arranged in the pump casing, a water inlet is arranged at the bottom of the pump casing and a drainage outlet is arranged at the side, wherein the impeller comprises a central axis, a disc surrounding the axis, a plurality of first blades radiating outward from the axis, and a plurality of second blades, wherein the central axis is connected to the output shaft of the drainage motor, the first blades are connected to the central axis and the disc, the second blades are connected to the first blades and extend out of the drainage outlet away from the central axis along the axial direction of the central axis; the water inlet is communicated with the water receiving pan, and the drainage outlet is used to discharge the condensed water in the water receiving pan to the outside when the drainage pump is working;

[0041] At least one guide plate is respectively arranged on each of the second blades, and the guide plate extends from bottom to top in the reverse direction of the rotation of the impeller;

[0042] At least one blade and at least one brush are arranged on the bottom of the second blade extending out of the drain outlet;

[0043] The blades and brushes are radially arranged from the axis to the surrounding areas on the rotation plane of the impeller, wherein the cutting edge of each blade faces the rotation direction of the impeller;

[0044] A water pump driving unit, which is used to drive the drainage pump to operate;

[0045] A main control unit is connected to the water pump driving unit.

[0046] In some embodiments of the present application, the number of the blade and the number of the brush are both multiple;

[0047] The blades are alternately located between the brushes;

[0048] Wherein, the bristles of each brush extend toward the water receiving tray along the axial direction of the central axis.

[0049] After reading the specific embodiments of the present invention in conjunction with the accompanying drawings, other features and advantages of the present invention will become more clear. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0051] Figure 1 is a principle block diagram of an air conditioner embodiment proposed in the present application;

[0052] Figure 2 This is a structural diagram of an existing drainage pump;

[0053] Figure 3 It is the structural diagram of the impeller in the existing drainage pump;

[0054] Figure 4 This is an example of arranging a drain pump in a water receiving tray according to an air conditioner embodiment proposed in this application. Figure 1 ;

[0055] Figure 5 A bottom view of an embodiment of a drainage pump in an air conditioner embodiment according to the present application;

[0056] Figure 6 The structure of the impeller in one embodiment of the drainage pump in the air conditioner embodiment proposed in this application Figure 1 ;

[0057] Figure 7 The structure of the impeller in one embodiment of the drainage pump in the air conditioner embodiment proposed in this application Figure 2 ;

[0058] Figure 8 A schematic diagram of the connection between the main control unit and the water pump drive unit in the air conditioner embodiment proposed in the present application;

[0059] Fig. 9 A bottom view of another embodiment of a drainage pump in an air conditioner embodiment according to the present application;

[0060] Fig.10 The structure of the impeller in another embodiment of the drainage pump in the air conditioner embodiment proposed in this application Figure 1 ;

[0061] Fig.11 The structure of the impeller in another embodiment of the drainage pump in the air conditioner embodiment proposed in this application Figure 2 ;

[0062] Fig.12 Schematic diagram of a drainage pump embodiment of an air conditioner embodiment proposed in the present application arranged in a water receiving tray Figure 2 ;

[0063] Fig.13 A connection diagram between a main control unit and a valve drive unit in an embodiment of an air conditioner according to the present application;

[0064] Fig.14 A control principle diagram between a valve driving chip and a relay in an air conditioner embodiment according to the present application;

[0065] Reference numerals:

[0066] 100, water receiving tray; 110, water receiving bottom wall; 111, water return port; 200, drainage pump; 210, pump housing; 220, water inlet; 230, drainage port; 240, impeller; 241, central axis; 242, disc; 243, first blade; 244, second blade; 245, auxiliary blade; 246, guide plate; 247, blade; 248, brush; 250, first drainage pipeline; 260, second drainage pipeline; 270, tee; 280, water return pipeline; 300, controllable valve; 400, valve drive unit; 410, valve drive chip; 500, relay;

[0067] L1: horizontal drainage pipe; L2: vertical drainage pipe. DETAILED DESCRIPTION

[0068] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0069] In the description of the present application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0070] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0071] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0072] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0073] The disclosure below provides many different embodiments or examples for realizing different structures of the utility model. In order to simplify the disclosure of the utility model, the components and settings of specific examples are described below. Of course, they are merely examples, and the purpose is not to limit the utility model. In addition, the utility model may repeat reference numbers and / or reference letters in different examples, and such repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the utility model provides various specific examples of processes and materials, but those of ordinary skill in the art may be aware of the application of other processes and / or the use of other materials.

[0074] <Basic working principle of air conditioner>

[0075] See also Figure 1 , which shows a structural schematic diagram of an air conditioner.

[0076] The air conditioner performs the air conditioner's refrigeration cycle by using a compressor, condenser, expansion valve, and evaporator. The refrigeration cycle includes a series of processes involving compression, condensation, expansion, and evaporation to cool or heat the indoor space.

[0077] The low-temperature and low-pressure refrigerant enters the compressor, which compresses it into high-temperature and high-pressure refrigerant gas and discharges the compressed refrigerant gas. The discharged refrigerant gas flows into the condenser. The condenser condenses the compressed refrigerant into a liquid phase, and the heat is released to the surrounding environment through the condensation process.

[0078] The expansion valve expands the high-temperature and high-pressure liquid refrigerant condensed in the condenser into a low-pressure liquid refrigerant. The evaporator evaporates the refrigerant expanded in the expansion valve and returns the low-temperature and low-pressure refrigerant gas to the compressor. The evaporator can achieve a cooling effect by utilizing the latent heat of evaporation of the refrigerant to exchange heat with the material to be cooled. In the entire cycle, the air conditioner can adjust the temperature of the indoor space.

[0079] The outdoor unit of the air conditioner refers to a portion of a refrigeration cycle including a compressor and an outdoor heat exchanger, the indoor unit of the air conditioner includes an indoor heat exchanger, and an expansion valve may be provided in the indoor unit or the outdoor unit.

[0080] The indoor heat exchanger and the outdoor heat exchanger function as a condenser or an evaporator. When the indoor heat exchanger functions as a condenser, the air conditioner functions as a heater in a heating mode, and when the indoor heat exchanger functions as an evaporator, the air conditioner functions as a cooler in a cooling mode.

[0081] The drain pump 200 is a component of the indoor unit of the air conditioner. In the cooling mode of the air conditioner, condensed water will be generated on the surface of the indoor heat exchanger serving as the evaporator when the air flow passes through it. Generally, a water receiving pan 100 for receiving the condensed water is arranged under the indoor heat exchanger. The drain pump 200 is installed in the water receiving pan 100 and is used to draw the condensed water in the water receiving pan 100 out to the outside of the indoor unit of the air conditioner when the drain pump 200 is started.

[0082] Foreign objects such as lint and hair may accumulate in the water receiving tray 100 for a long time. When the drain pump 200 drains water, the foreign objects in the water receiving tray 100 may enter the drain pump 200, causing a risk of dirt and blockage of the drain pump 200.

[0083] Therefore, in order to solve the problem of the drainage pump 200 being blocked by dirt and sedimentation inside the water receiving pan 100 in the existing air conditioner, the present application provides an air conditioner, which can improve the drainage capacity by setting a guide plate 246 on the drainage pump impeller 240, and set a blade 247 at the bottom of the impeller 240. When the drainage pump 200 rotates, the blade 247 crushes and cuts foreign matter, thereby reducing the risk of large foreign matter entering the drainage pump 200 and blocking the drainage pump 200, thereby improving the working reliability of the drainage pump 200.

[0084] The air conditioner includes a water receiving pan 100 , a drain pump 200 , a water pump driving unit (not shown), and a main control unit (not shown).

[0085] The water receiving tray 100 is located in the indoor unit of the air conditioner and is used to receive condensed water generated when the air flow passes through the low-temperature indoor heat exchanger surface during the cooling operation of the air conditioner.

[0086] See also Figure 2 and Figure 3 A common drainage pump 200 includes a drainage motor, a pump casing 210 and an impeller 240 .

[0087] The impeller 240 is disposed in the pump housing 210 . The impeller 240 is connected to the drainage motor and is driven by the drainage motor to rotate freely in the pump housing 210 .

[0088] A water inlet 220 and a water outlet 230 are formed on the pump housing 210 . Specifically, the water inlet 220 is provided at the bottom of the pump housing 210 , and the water outlet 230 is provided at the side.

[0089] When the drain pump 200 is working, the drain motor drives the impeller 240 to rotate, and the condensed water accumulated in the water receiving tray 100 is sucked into the water inlet 220, and rises upward in the pump body due to the inertia driven by the impeller 240, and is finally discharged to the outside from the drain port 230 under the action of centrifugal force.

[0090] The impeller 240 is a key component of the drainage pump 200. Figure 3 A structural diagram of a conventional impeller 240 is shown.

[0091] The impeller 240 has a central axis 241 , a disk 242 surrounding the axis, a plurality of first blades 243 , a plurality of auxiliary blades 245 and a plurality of second blades 244 .

[0092] The central shaft portion 241 is located at the axis of the impeller 240 and is connected to the output shaft of the drainage motor to receive the power output by the drainage motor.

[0093] The disk 242 includes a circumferential wall surrounding the axis of the impeller 240 of the drainage pump 200 and a bottom wall, wherein the bottom wall has a through hole, wherein the axis of the impeller 240 and the axis of the central shaft portion 241 are located on the same axis.

[0094] A plurality of first blades 243 are connected between the central shaft portion 241 and the circumferential wall of the disk 242 .

[0095] The first blades 243 are planar plate-shaped blades distributed along the axial direction of the central axis 241 and connected to each other. They are radially arranged from the axis to the surroundings, and generally there are four of them.

[0096] The auxiliary blades 245 are also planar plate-shaped blades, which are alternately located between the first blades 243 and are also radially arranged in all directions. The outer ends of the auxiliary blades 245 are connected to the circumferential wall.

[0097] In some embodiments of the present application, a plurality of second blades 244 are disposed below the disk and connected to the lower ends of a plurality of first blades 243 .

[0098] In some embodiments of the present application, the second blades 244 are planar plate-shaped blades distributed along the axial direction of the central axis 241 and connected to each other. They are radially arranged from the axis to the surroundings, and the number is generally 4.

[0099] See also Figure 4 The drain pump 200 is installed in the water receiving tray 100 , for example, inverted in the water receiving tray 100 , so that the water inlet 220 of the drain pump 200 faces the water receiving tray 100 , for example, contacts the condensed water in the water receiving tray 100 .

[0100] When the drainage pump 200 is working, the impeller 240 draws and lifts water from the water inlet 220 by means of the rotation and stirring of the second blade 244 and the first blade 243 , and discharges the water from the drainage port 230 .

[0101] The bottom end of the second blade 244 of the conventional impeller 240 does not extend beyond the drain port 230 .

[0102] In some embodiments of the present application, the second blade 244 extends away from the central axis portion 241 along the axial direction of the central axis portion 241 and exceeds the drain port 230, see Figure 5 .

[0103] See also Figure 6 and Figure 7 At least one guide plate 246 is disposed on at least one of the second blades 244, and the guide plate 246 rotates along the impeller 240 (see Figure 6 The arrow in the middle indicates the reverse extension from bottom to top.

[0104] In some embodiments of the present application, the second blades 244 are planar plate-shaped blades distributed along the axial direction of the central axis 241 and connected to each other. The second blades 244 are four in number and are evenly arranged radially from the axis to the surrounding areas.

[0105] In this way, at least one guide plate 246 may be selectively provided on at least one second blade 244 . For example, three spaced guide plates 246 may be provided on each of two second blades 244 .

[0106] The extension degree of each guide plate 246 is the same. For example, the guide plates 246 are all in the shape of a flat plate, or are all in the shape of a spiral surface, etc.

[0107] In some embodiments of the present application, see Figure 6 and Figure 7 , three spaced guide plates 246 are respectively provided on each of the four second blades 244, and the arrangement of the plurality of guide plates 246 on each second blade 244 is the same.

[0108] In this way, when the impeller 240 rotates, the lifting capacity of the water flow can be evenly enhanced.

[0109] In some embodiments of the present application, see Figure 7 The guide plate 246 can be a flat plate to reduce the manufacturing cost.

[0110] In some embodiments of the present application, the guide plate may be in the shape of a spiral surface, and the guide plate in the shape of a spiral surface can stably enhance the lifting capacity of water.

[0111] Regardless of the extension degree of the guide plate 246, the guide plate 246 extends from bottom to top in the opposite direction of the rotation of the impeller 240, so that the water flow can be lifted.

[0112] In some embodiments of the present application, when the second blades 244 are planar plate-shaped blades uniformly arranged radially from the axis to the periphery, see Figure 7 The multiple guide plates 246 belonging to the same blade are located on the outermost side of the second blade 244 .

[0113] In this way, the area of ​​the second blade 244 is increased, thereby improving the ability to lift the water flow.

[0114] By adding a guide plate 246 extending from bottom to top on the second blade 244, the water flow lifting capacity can be improved during the operation of the drainage pump 200, and the drainage head and flow rate can be increased, thereby improving the drainage efficiency and reducing the power of the drainage motor.

[0115] In some embodiments of the present application, see Figure 6 and Figure 7 At least one blade 247 is disposed at the bottom of the second blade 244 .

[0116] The blades 247 are radially arranged from the axis to the periphery on the rotation plane of the impeller 240 , and the cutting edge of each blade 247 faces the rotation direction of the impeller 240 .

[0117] When the drain pump 200 is working, since the blade 247 is set on the second blade 244, the rotation of the impeller 240 drives the blade 247 to rotate. While the blade 247 rotates to stir the condensed water at the water inlet 220, it also cuts and crushes foreign matter in the condensed water to prevent large foreign matter from being sucked into the drain pump 200 and creating the risk of clogging the drain pump 200.

[0118] In some embodiments of the present application, there are multiple blades 247 to improve the efficiency of cutting foreign matter.

[0119] The plurality of blades 247 are evenly radially arranged from the axis to the surrounding areas on the rotation plane of the impeller 240, so that during the operation of the drainage pump 200, the plurality of evenly radially arranged blades 247 exert a consistent force on foreign matter in the condensed water, thereby achieving the working reliability of the drainage pump 200.

[0120] As described above, if each second blade 244 is four planar plate-shaped blades distributed along the axial direction of the central axis 241, connected to each other and radially arranged from the axis to the surroundings (see Figure 6 and Figure 7 ), in order to arrange the blades 247 in a balanced manner, a blade 247 is set at the bottom of each second blade 244.

[0121] Thus, the four blades 247 are also arranged radially from the axis to the surrounding areas.

[0122] When the drainage pump 200 is working, the impeller 240 uses the guide plate 246 to enhance the lifting effect on the water flow, and the four blades 247 cut and crush foreign matter. Therefore, the design of this impeller 240 not only improves the drainage efficiency, but also facilitates the discharge of the cut and crushed foreign matter, and avoids the risk of large foreign matter entering the drainage pump 200 and causing the drainage pump 200 to be blocked.

[0123] In some embodiments of the present application, the drain pump 200 is driven by a water pump driving unit.

[0124] The water pump driving unit is connected to the main control unit, and is used to receive a PWM pulse driving signal sent by the main control unit, and control the operation of the drainage pump 200 based on the PWM pulse driving signal.

[0125] The larger the duty cycle of the PWM pulse driving signal, the faster the drain pump 200 runs, and thus the faster the drainage speed is; the smaller the duty cycle of the PWM pulse driving signal, the slower the drain pump 200 runs, and thus the slower the drainage speed is.

[0126] See also Figure 8 The water pump drive unit includes a water pump drive chip, and the core of the main control unit is the MCU chip.

[0127] The water pump driving chip has a PWM pin, and the PWM pin is used to receive the PWM pulse signal output by the first output pin of the MCU chip.

[0128] The water pump driver chip also has an overcurrent protection function, which realizes current limiting protection for the drainage motor by setting an overcurrent protection circuit on its periphery.

[0129] In some embodiments of this application, see Figure 8 The water pump driving chip has a first pin, a second pin and a third pin, and the overcurrent protection circuit is arranged between the first pin, the second pin and the third pin.

[0130] The overcurrent protection circuit includes a first resistor R1, a second resistor R2 and a third resistor R3.

[0131] The first pin is grounded through the first resistor R1 , the second pin is grounded through the second resistor R2 , and the third pin is connected to a connection point where the second pin and the second resistor R2 are connected through the third resistor R3 .

[0132] The overcurrent protection limit of the drainage motor can be set by setting the value of each resistor, and different overcurrent protection limit values ​​can be set by changing the value of each resistor.

[0133] See also Figure 8 The water pump driver chip also has a speed feedback pin, and the MCU chip has a first input pin.

[0134] The speed feedback pin is connected to the first input pin, and is used by the main control unit to detect the speed of the drainage pump 200 in real time and perform closed-loop control on the speed to achieve stable and controllable speed.

[0135] See also Figures 9 to 11 In some embodiments of the present application, at least one blade 247 and at least one brush 248 may be provided at the bottom of the second blade 244 .

[0136] The arrangement of the at least one blade 247 may refer to the arrangement described above.

[0137] The brushes 248 are also radially arranged from the axis to the surrounding areas on the rotation plane of the impeller 240.

[0138] When the drainage pump 200 is working, the blade 247 and the brush 248 will rotate with the impeller 240. The blade 247 is used to cut and crush foreign matter to facilitate discharge, and the brush 248 collects foreign matter by sticking to reduce the deposition of foreign matter in the water receiving tray 100.

[0139] The foreign matter collected by the brush 248 can be processed collectively later.

[0140] In some embodiments of the present application, see Fig. 9 and Fig.11 , multiple blades 247 and multiple brushes 248 can be set.

[0141] The blades 247 are alternately located between the brushes 248, making it easy to collect foreign matter after cutting.

[0142] The bristles of each brush 248 extend toward the water receiving tray 100 along the axial direction of the central axis portion 241 .

[0143] Such an arrangement can increase the contact area between the bristles and foreign matter when the impeller 240 rotates to stir the condensed water, so that the brush 248 can collect more foreign matter and prevent the foreign matter from being deposited in the water receiving tray 100.

[0144] In some embodiments of the present application, in order to avoid the problem of excessive condensed water in the water receiving pan 100 overflowing and causing safety hazards when the drain pump 200 malfunctions, in some embodiments of the present application, the air conditioner also includes a float switch (not shown).

[0145] The float switch is disposed in the water receiving tray 100 for detecting the water level of condensed water in the water receiving tray 100 , and a preset water level is preset inside the float switch, which is the maximum water level in the water receiving tray 100 .

[0146] When the water level in the water receiving tray 100 reaches a preset water level, the float switch is activated and sends out a detection signal, and the detection signal is transmitted to the main control unit.

[0147] After receiving the detection signal, the MCU chip controls the indoor fan to stop running.

[0148] As described above, when the float switch is disconnected, it indicates that the water level in the water receiving tray 100 has reached the preset water level. This situation indicates that the drainage of the drainage pump 200 is abnormal. Therefore, at this time, manual drainage should be carried out in time.

[0149] In order to remind people to drain the water in time, the air conditioner further comprises an alarm unit (not shown), which is used to control the alarm unit to send out an alarm prompt when the main control unit receives a low-level detection signal, so as to intuitively remind the user to drain the water in time.

[0150] In some embodiments of the present application, see Fig.12 In order to solve the problems of foreign matter deposition and water return noise, the present application relates to an air conditioner, in which the original drainage pipeline is branched into a drainage pipeline and a water return pipeline 280.

[0151] When the drain pump 200 is working, the water returns to the water receiving bottom wall 110 of the water receiving pan 100, and the disturbed foreign matter does not settle, so that it is discharged to the outside through the drain pump 200 along with the condensed water, avoiding the problem caused by long-term sedimentation; and when the drain pump 200 stops working, the returned condensed water does not directly return to the drain port 230, but returns to the water receiving bottom wall 110 of the water receiving pan 100 through the return pipe 280, avoiding the generation of return noise. The specific details are as follows.

[0152] In some embodiments of the present application, see Fig.13 and Fig.14 The air conditioner further includes a valve driving unit 400 and a controllable valve 300 connected to the main control unit.

[0153] See also Figure 4 As shown, the drainage pipeline has a horizontal drainage pipeline L1 and a vertical drainage pipeline L2 (forming a drainage head for preventing backflow).

[0154] See also Figure 4 The water inlet 220 of the drainage pump 200 is installed at a certain distance from the water receiving bottom wall 110 of the water receiving tray 100 , and a water return port 111 is opened on the water receiving bottom wall 110 of the water receiving tray 100 .

[0155] The water return port 111 is preferably disposed close to the water inlet 220 , so that the condensed water of the return water can disturb the condensed water in the water receiving tray 100 so as to be better absorbed by the water inlet 220 of the drainage pump 200 .

[0156] The horizontal drainage pipe L1 as described above is referred to as a first drainage pipe 250 .

[0157] In some embodiments of the present application, in order to take into account both condensate drainage and water return, see Fig.12 , the water flow discharged from the first drainage pipeline 250 is branched into the second drainage pipeline 260 and the return pipeline 280.

[0158] The second drainage pipeline 260 is a vertically upward drainage pipeline that forms a drainage head for drainage.

[0159] The return water pipeline 280 is a section of pipeline extending in the opposite direction to the second drainage pipeline 260 , and is connected to the return water port 111 of the water receiving tray 100 for returning water.

[0160] In some embodiments of the present application, a controllable valve 300 is provided on the first drainage pipeline 250 , and the controllable valve 300 is controlled by a main control unit.

[0161] In some embodiments of the present application, the controllable valve 300 may selectively use a solenoid valve.

[0162] See also Fig.12When drainage is required, the drainage pump 200 works, and the controllable valve 300 is controlled to be connected. A portion of the water discharged from the drainage port 230 flows to the second drainage pipe 260 through the first drainage pipe 250 and the controllable valve 300 and is discharged outdoors, and a portion of the water flows to the return pipe 280 and returns to the return port 111.

[0163] When the drainage pump 200 stops working, the controllable valve 300 is disconnected under control and drainage cannot be performed. At this time, the condensed water in the second drainage pipeline 260 flows to the return water port 111 through the return water pipeline 280 .

[0164] In some embodiments of the present application, a tee 270 is provided on the first drainage pipeline 250 to change the direction of the condensed water drawn out from the drainage port 230 .

[0165] The three-way valve 270 has three ports, which are respectively referred to as a first port, a second port and a third port that are connected to each other.

[0166] The first opening is communicated with the drain port of the first drain pipe 250 , the second opening is communicated with the water inlet of the second drain pipe 260 , and the third opening is communicated with the water inlet of the return pipe 280 .

[0167] In some embodiments of the present application, when designing, refer to Fig.12 The cross-sectional area of ​​the return pipe 280 is smaller than the cross-sectional area of ​​the second drainage pipe 260 , wherein the cross-sectional area of ​​the first drainage pipe 250 is obviously at least greater than or equal to the cross-sectional area of ​​the second drainage pipe 260 .

[0168] Since the cross-sectional area of ​​the first drain pipe 250 and the second drain pipe 260 is larger and the cross-sectional area of ​​the return pipe 280 is smaller, when the drain pump 200 is working and the controllable valve 300 is connected, most of the condensed water is discharged to the outside through the first drain pipe 250 and the second drain pipe 260 to ensure drainage efficiency, and a small part of the condensed water is returned to the return port 111 of the water receiving bottom wall 110 of the water receiving pan 100 through the return pipe 280.

[0169] The small flow of water disturbs the condensed water and sediment in the water tray 100 to avoid the noise caused by a large-scale disturbance, and the disturbed foreign matter will be discharged along with the condensed water by the drain pump 200.

[0170] In some embodiments of the present application, during the drainage process of the drain pump 200, the rotation speed of the drain pump 200 can be controlled. The greater the rotation speed, the greater the drainage force and the greater the return water pressure. In this way, the disturbance force of the condensed water on the bottom wall 110 of the water tray 100 is also greater, which is more conducive to the discharge of impurities and foreign matter by the drain pump 200.

[0171] In addition, the small flow rate backflow reduces the water flow noise caused by the impact of the water flow, and at the same time the return water is mixed with the condensed water in the water receiving tray 100 without air mixing, and no bubbles are generated, thereby reducing the return water noise.

[0172] In some embodiments of this application, see Fig.13 and Fig.14 , the controllable valve 300 is driven to be on and off through the valve driving unit 400.

[0173] The core unit of the main control unit is the MCU chip, which outputs a control signal. Based on the control signal, the valve driving unit 400 operates to drive the controllable valve 300 to open or close in response to the control signal.

[0174] When the main control unit adopts an MCU chip, the MCU chip outputs a first control signal at a first control pin.

[0175] When the valve driving unit 400 receives the first control signal, the corresponding output terminal controls the controllable valve 300 to be turned on or off.

[0176] In some embodiments of this application, see Fig.14 , the valve driving unit 400 includes a valve driving chip 410 and a relay 500 .

[0177] The MCU chip outputs a first control signal at a first control pin.

[0178] In some embodiments of this application, see Fig.14 The first input terminal of the valve driving chip 410 is connected to the first control pin of the MCU chip, the first output terminal is connected to one end of the coil of the relay 500, and the power supply Vcc is connected to the other end of the coil of the relay 500.

[0179] The normally open switch of the relay 500 is connected in series to the power supply line of the controllable valve 300 .

[0180] When the first control signal drives the first output terminal to output a low level, the coil of the relay 500 is energized, and the normally open switch is closed, thereby connecting the power supply line to normally supply power to the controllable valve 300. At this time, the controllable valve 300 is opened and connected.

[0181] When the first control signal drives the first output terminal to output a high level, the coil of the relay 500 loses power, the normally open switch is disconnected, and the power supply line is disconnected, so that the controllable valve 300 cannot be powered. At this time, the controllable valve 300 is closed and disconnected.

[0182] In the description of the above embodiments, specific features, structures, materials or characteristics may be combined in a suitable manner in any one or more embodiments or examples.

[0183] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited to this. Any changes or substitutions that can be easily thought of by technicians familiar with the technical field within the technical scope disclosed by the utility model should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. An air conditioner, characterized in that: include: A water receiving tray, which is used to receive condensed water generated during the cooling operation of the air conditioner; A drainage pump, which is installed in the water receiving pan, comprises a drainage motor, a pump casing and an impeller, wherein the impeller is arranged in the pump casing, a water inlet is arranged at the bottom of the pump casing and a drainage outlet is arranged at the side, wherein the impeller comprises a central axis, a disc surrounding the axis, a plurality of first blades radiating outward from the axis, and a plurality of second blades, wherein the central axis is connected to the output shaft of the drainage motor, the first blades are connected to the central axis and the disc, the second blades are connected to the first blades and extend out of the drainage outlet away from the central axis along the axial direction of the central axis; the water inlet is communicated with the water receiving pan, and the drainage outlet is used to discharge the condensed water in the water receiving pan to the outside when the drainage pump is working; At least one guide plate is disposed on at least one of the second blades, and the guide plate extends from bottom to top in the reverse direction of the rotation of the impeller; At least one blade is arranged on the bottom of the second blade extending out of the drain port, and each blade is radially arranged from the axis to the surroundings on the rotation plane of the impeller, and the blade faces the rotation direction of the impeller; A water pump driving unit, which is used to drive the drainage pump to operate; A main control unit is connected to the water pump driving unit.

2. The air conditioner according to claim 1, characterized in that: A plurality of spaced guide plates are respectively arranged on each of the second blades; The extension degree of each guide plate from bottom to top is the same.

3. The air conditioner according to claim 2, characterized in that: The guide plate is in the shape of a flat plate.

4. The air conditioner according to claim 1, characterized in that: Each of the second blades is a flat plate-shaped blade distributed along the axial direction of the central axis and connected to each other, and is radially arranged from the axis to the surroundings; The plurality of guide plates on the second blade are located on the outermost surface of the second blade.

5. The air conditioner according to claim 1, characterized in that: The number of guide plates on each second blade is the same and multiple; The plurality of guide plates on each second blade are arranged in the same manner.

6. The air conditioner according to claim 1, characterized in that: The number of the blades is multiple; A plurality of blades are evenly and radially arranged from the axis to the surrounding areas on the rotating plane of the impeller.

7. The air conditioner according to claim 6, characterized in that: Each of the second blades is a flat plate-shaped blade distributed along the axial direction of the central axis and connected to each other, and is evenly radially arranged from the axis to the surroundings; A blade is disposed at the bottom of each of the plurality of second blades.

8. The air conditioner according to claim 1, characterized in that: The water pump driving unit comprises: A water pump driving chip, the signal output by the speed feedback pin of which is fed back to the main control unit, for real-time detection of the speed of the drainage pump; An overcurrent protection circuit is disposed on the periphery of the water pump driving chip to provide overcurrent protection for the drainage pump motor.

9. An air conditioner, characterized in that: include: A water receiving tray, which is used to receive condensed water generated during the cooling operation of the air conditioner; A drainage pump, which is installed in the water receiving pan, comprises a drainage motor, a pump casing and an impeller, wherein the impeller is arranged in the pump casing, a water inlet is arranged at the bottom of the pump casing and a drainage outlet is arranged at the side, wherein the impeller comprises a central axis, a disc surrounding the axis, a plurality of first blades radiating outward from the axis, and a plurality of second blades, wherein the central axis is connected to the output shaft of the drainage motor, the first blades are connected to the central axis and the disc, the second blades are connected to the first blades and extend out of the drainage outlet away from the central axis along the axial direction of the central axis; the water inlet is communicated with the water receiving pan, and the drainage outlet is used to discharge the condensed water in the water receiving pan to the outside when the drainage pump is working; At least one guide plate is disposed on at least one of the second blades, and the guide plate extends from bottom to top in the reverse direction of the rotation of the impeller; At least one blade and at least one brush are arranged on the bottom of the second blade extending out of the drain outlet; The blades and brushes are radially arranged from the axis to the surrounding areas on the rotation plane of the impeller, wherein the cutting edge of each blade faces the rotation direction of the impeller; A water pump driving unit, which is used to drive the drainage pump to operate; A main control unit is connected to the water pump driving unit.

10. The air conditioner according to claim 9, characterized in that: The number of the blades and the number of the brushes are both multiple; The blades are alternately located between the brushes; Wherein, the bristles of each brush extend toward the water receiving tray along the axial direction of the central axis.

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