Indoor unit of air conditioner

Abstract

The utility model discloses an air conditioner indoor unit, and belongs to the technical field of air conditioners. The air conditioner indoor unit comprises a shell. The heat exchanger is arranged in the shell and used for exchanging heat with air passing through the heat exchanger; the water pan is arranged below the heat exchanger and used for collecting condensate water generated on the heat exchanger; the draining pump is used for draining condensate water in the water pan; the drainage nozzle is connected to the shell, and the drainage nozzle is communicated with the drainage end of the drainage pump; the non-return piece is inserted into the drainage nozzle, the non-return piece comprises a valve body, and the two axial ends of the valve body are provided with an inflow port allowing drainage water to flow in and an outflow port allowing drainage water to flow out respectively; the duckbilled valve element is arranged in the valve body, the inlet end of the duckbilled valve element is connected with the inner wall of the valve body, the outlet end of the duckbilled valve element is opened under the impact of drainage water flow to form a drainage channel, and the outlet end of the duckbilled valve element is closed in a natural state to prevent drainage water from flowing back. According to the air conditioner indoor unit, the non-return piece is arranged at the drainage nozzle, so that condensate water can be prevented from flowing back to the air conditioner indoor unit.

Description

Technical Field

[0001] The present application relates to the technical field of air conditioning, and in particular to an air conditioning indoor unit. Background Art

[0002] During the cooling process, the indoor unit of a multi-split air conditioner must drain condensate. This is typically done through gravity or auxiliary devices such as pumps, which drain it outdoors through drainage pipes. Ceiling-mounted indoor units often utilize a lift pump to assist in drainage, minimizing ceiling space. This requires a corresponding lift pipe to lift the condensate before it enters the subsequent drainage pipeline.

[0003] However, when the water pump stops running, the water in the lifting pipe will flow back into the air conditioner water pan, causing water accumulation in the water pan. When the lifting pipe is long and the amount of backflow water is large, it may even cause the water pan to overflow. Long-term accumulation of water will also cause mold to grow in the water pan, resulting in the generation of odor.

[0004] Currently, a water check valve is usually installed on the drain pipe. The most commonly used one is a PVC check valve. Its valve core uses a spring and a cover plate structure. The spring elastically resets the cover plate to achieve non-return. However, a large water pressure is required to open the cover plate. The spring in the air-conditioning indoor unit that requires frequent drainage is easily damaged after repeated elastic deformation, and its reliability is poor. In addition, on-site installation is inconvenient, and subsequent inspection and maintenance require destroying the pipeline. Utility Model Content

[0005] The utility model solves one of the technical problems in the related art at least to a certain extent.

[0006] To this end, the present application aims to provide an air-conditioning indoor unit, which can prevent condensed water from flowing back into the air-conditioning indoor unit by installing a check member at the drain nozzle.

[0007] In one aspect of the present application, an air-conditioning indoor unit comprises: a shell; a heat exchanger arranged in the shell for exchanging heat with air passing therethrough; a water collecting pan arranged below the heat exchanger for collecting condensed water generated on the heat exchanger; a drain pump for pumping the condensed water in the water collecting pan; a drain nozzle connected to the shell, the drain nozzle being connected to the drain end of the drain pump; a check member inserted into the drain nozzle, the check member comprising: a valve body, the axial ends of the valve body being an inlet for water flow in, and an outlet for water flow out; a duckbill valve core arranged in the valve body, the inlet end of the duckbill valve core being connected to the inner wall of the valve body, the outlet end of the duckbill valve core opening under the impact of the drainage water flow to form a drainage channel, and the outlet end of the duckbill valve core being closed in a natural state to prevent drainage backflow.

[0008] In this technical solution, a check piece is connected to the drain nozzle, and the check piece includes a valve body and a duckbill valve core connected to the valve body. The inner wall of the outlet end of the duckbill valve core is opened outward under the impact of the drainage water flow to form a drainage channel for drainage outflow; when the drainage flows back, the backflow water flows act on the outer wall surface of the outlet end, the outlet end cannot open, the drainage channel is closed, and the backflow water flow is blocked, thereby avoiding the backflow of condensed water.

[0009] In addition, in this technical solution, as long as there is a slight water pressure, the outlet end of the duckbill valve core can be flushed open by the water flow, avoiding the problem in the prior art that a large water pressure is required to open the one-way valve.

[0010] In addition, in this technical solution, the check piece is installed at the drain nozzle. During inspection and maintenance, it is only necessary to remove the drain pipe from the drain nozzle without damaging the pipeline.

[0011] In some embodiments, the check member includes: a silencer plate connected to the outflow port, and a plurality of through-silencer holes are provided on the silencer plate.

[0012] This technical solution incorporates a muffler plate at the valve body's outlet, which diverts the drainage flow and acts as a buffer, preventing the noise generated by excessively concentrated water falling into the drainpipe's connecting pipes. Backflowing water carries air and generates bubbling noise. The muffler plate effectively separates the water flow from the bubbles, further reducing noise.

[0013] In some embodiments, the sound-absorbing sheet separates the outflow port into a first outflow port and a second outflow port, and the arrangement direction of the first outflow port and the second outflow port is the same as the opening direction of the outlet end.

[0014] In this technical solution, since the arrangement direction of the first flow outlet and the second flow outlet is the same as the opening direction of the outlet end, the backflow water can flow to the side of the outlet end located in the opening direction after passing through the first flow outlet and the second flow outlet, and the backflow water flows in the closing direction of the outlet end, thereby ensuring that the outlet end is tightly closed, and improving the reliability of the duckbill valve core in the closed state when the condensate flows back.

[0015] In some embodiments, in the projection of the plane where the outflow outlet is located, the muffler plate partially overlaps with the outflow outlet, and the closed outlet end is located within the outer contour of the muffler plate.

[0016] In the technical scheme, since the sound-absorbing sheet is arranged opposite the outlet in the water flow direction, on one hand, when the normal drainage water flow flows out from the outlet end of the duckbill valve core, more water flow can flow to the sound-absorbing sheet, so that the sound-absorbing effect of the sound-absorbing sheet is maximized; on the other hand, when the drainage water flows backward, the sound-absorbing sheet has a water blocking effect, which can weaken or even avoid the direct impact of the backward water flow on the outlet end, and can ensure the reliability of the duckbill valve core in the closed state when the water flows backward.

[0017] In some embodiments, the inner wall of the valve body is provided with a plurality of first flow guide grooves which are uniformly distributed in the circumferential direction, and the first flow guide grooves extend along the axial direction of the valve body.

[0018] In the technical scheme, the first flow guide grooves are arranged on the inner wall of the valve body, so that the condensed water can be easily collected, the flow rate of the water flow along the wall of the valve body is increased, and the condensed water can be quickly and effectively discharged.

[0019] In some embodiments, the inner wall of the duckbill valve core is provided with a plurality of second flow guide grooves which extend in the drainage direction, and the outer wall surface of the duckbill valve core is a smooth surface.

[0020] In the technical scheme, the second flow guide grooves are arranged on the inner wall of the duckbill valve core, so that the flow rate of the water flow can be increased, and the water flow can be effectively discharged; the outer surface of the duckbill valve core is arranged as a smooth surface, which can effectively block the backward condensed water when the condensed water flows backward, and can avoid excessive deformation of the duckbill valve core.

[0021] In some embodiments, the outer diameter of at least the portion of the valve body close to the flow inlet gradually increases in the direction from the flow inlet to the flow outlet.

[0022] In the technical scheme, the outer diameter of the flow inlet side of the valve body is relatively small, which is conducive to the insertion of the check member into the drain nozzle.

[0023] In some embodiments, the outer periphery of the valve body is provided with a plurality of protruding ribs which are arranged at intervals in the axial direction, and the protruding ribs are located on the side of the valve body close to the flow outlet.

[0024] In the technical scheme, the protruding ribs are arranged, which can increase the frictional resistance between the check member and the drain nozzle, avoid the check member from falling off due to the impact of the water flow during use, and ensure the reliability of the check member.

[0025] In some embodiments, the valve body comprises: a first valve body portion which is provided with a flow inlet at one end, and is inserted into the drain nozzle; and a second valve body portion which is connected to the end of the first valve body portion away from the flow inlet, and the side wall of the second valve body portion abuts against the end portion of the drain nozzle.

[0026] In the technical scheme, the second valve body portion abuts against the drain nozzle, which has a positioning effect during assembly, and the second valve body portion is outside the drain nozzle, so that an operator can exert force on the second valve body portion to pull out the check member during maintenance.

[0027] and a tube connecting the discharging outlet to the outlet port of the heat exchanger to connect the heat exchanger to the outlet port of the heat exchanger, wherein the tube has a first end connected to the outlet port of the heat exchanger and a second end connected to the outlet port of the heat exchanger to connect the heat exchanger to the outlet port of the heat exchanger.

[0028] In the technical solution, a check piece is connected to the drain spout, and the check piece includes a valve body and a duckbill valve core connected to the valve body. The inner wall of the outlet end of the duckbill valve core is opened outward under the impact of the drainage water flow to form a drainage channel for drainage outflow; when the drainage flows back, the backflow water flows act on the outer wall surface of the outlet end, the outlet end cannot open, the drainage channel is closed, and the backflow water flow is blocked, thereby avoiding the backflow of condensed water.

[0029] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 shows a perspective view of an air conditioner indoor unit according to some embodiments;

[0031] Figure 2 shows a cross-sectional view of an air conditioner indoor unit according to some embodiments;

[0032] Figure 3 shows a partial cross-sectional view of an air conditioner indoor unit according to some embodiments;

[0033] Figure 4 A diagram illustrating a drain nozzle and a check member of an air conditioner indoor unit according to some embodiments;

[0034] Figure 5 A perspective view illustrating a backstop of an air conditioner indoor unit according to some embodiments;

[0035] Figure 6 A perspective view of a check member of an air conditioner indoor unit according to some embodiments is shown from another perspective;

[0036] Figure 7A side view illustrating a backstop of an air conditioner indoor unit according to some embodiments;

[0037] Figure 8 Shown Figure 7 A cross-sectional view taken along line AA of the check member in its natural state;

[0038] Figure 9 Shown Figure 7 A cross-sectional view taken along line AA of the check member in the drainage state;

[0039] Figure 10 A side view of a check member of an air conditioner indoor unit according to some embodiments is shown from another perspective.

[0040] In the above figures: 10, shell; 11, air inlet; 12, air outlet; 13, middle partition; 20, fan; 30, heat exchanger; 40, water collecting pan; 50, drain pump; 60, drain nozzle; 70, check piece; 71, valve body; 711, inlet; 712, outlet; 713, first outlet; 714, second outlet; 715, first guide groove; 716, rib; 717, first valve body; 718, second valve body; 72, duckbill valve core; 72a, drainage channel; 721, inlet end; 722, outlet end; 723, base; 724, first flap; 725, second flap; 726, second guide groove; 73, silencer; 731, silencer hole; 90, drain pipe; 91, connecting pipe; 92, lifting pipe. DETAILED DESCRIPTION

[0041] In order to make the purpose and implementation of this application clearer, the exemplary implementation of this application will be clearly and completely described below in conjunction with the drawings in the exemplary embodiments of this application. Obviously, the described exemplary embodiments are only part of the embodiments of this application, not all of the embodiments.

[0042] In the description of this application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this 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 cannot be understood as a limitation on this application.

[0043] The terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, features specified as "first" and "second" may explicitly or implicitly include one or more of such features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0044] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0045] In this application, the air conditioner performs a refrigeration cycle of the air conditioner by using a compressor, a condenser, an expansion valve and an evaporator. The refrigeration cycle includes a series of processes involving compression, condensation, expansion and evaporation, and supplies refrigerant to the air that has been conditioned and heat exchanged.

[0046] The compressor compresses low-temperature, low-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, releasing heat into the surrounding environment through the condensation process.

[0047] The expansion valve expands the high-temperature, high-pressure liquid refrigerant condensed in the condenser to a lower-pressure liquid. The evaporator evaporates the refrigerant expanded in the expansion valve and returns the low-temperature, low-pressure refrigerant gas to the compressor. The evaporator achieves cooling by utilizing the latent heat of evaporation to exchange heat with the material being cooled. Throughout this cycle, the air conditioner regulates the temperature of the indoor space.

[0048] When an air conditioner's indoor and outdoor units are two-piece, the indoor unit is also called the indoor unit, and the outdoor unit is also called the outdoor unit. The indoor unit can be installed indoors. It's connected to the outdoor unit, which is installed outdoors, via piping.

[0049] The following describes this application using the indoor unit of a split unit and a ducted unit with a ceiling-mounted indoor unit as examples:

[0050] Reference Figures 1 to 3 The air conditioner indoor unit according to the embodiment of the present application includes a housing 10 in which a plurality of components constituting a refrigeration cycle are installed.

[0051] The housing 10 is in the shape of a rectangular parallelepiped. An air inlet 11 is provided on one of a pair of opposing side surfaces of the housing 10, and an air outlet 12 is provided on the other side surface. Indoor air is introduced into the housing 10 through the air inlet 11 and is delivered into the indoor space through the air outlet 12.

[0052] For the convenience of description, this application defines the side of the air-conditioning indoor unit where the air outlet 12 is located as the front side, and the other side opposite thereto as the rear side. Figure 2 As shown, the air outlet 12 is at the front and the air inlet 11 is at the back.

[0053] In an example of an installation scenario, the air inlet 11 can be connected to the air inlet grille of the ceiling decoration, so that indoor air can flow into the shell 10 through the air inlet grille and the air inlet 11. An air outlet flange can be set on the outside of the air outlet 12, and the air outlet flange can be extended from the air duct to the indoor space by connecting the air duct.

[0054] Specific reference Figure 2 A middle partition 13 may be provided in the shell 10 to separate the space in the shell 10 into an air inlet cavity and an air outlet cavity through the middle partition 13 , wherein the air inlet cavity is connected to the air inlet 11 , and the air outlet cavity is connected to the air outlet 12 .

[0055] The indoor unit of the air conditioner may include a fan 20, which is arranged in the air inlet cavity. The fan 20 may be a centrifugal fan. The air flow at the exhaust end of the fan 20 is blown to the air outlet cavity through the middle partition 13.

[0056] The air conditioner indoor unit may include a heat exchanger 30 disposed in the air outlet cavity. The heat exchanger 30 is configured to absorb heat from the air introduced into the housing 10 or transfer heat to the air.

[0057] Under the action of the fan 20 , the indoor air enters the air inlet cavity from the air inlet 11 , then flows into the air outlet cavity through the fan 20 , and flows to the air outlet 12 after heat exchange in the heat exchanger 30 .

[0058] During the cooling process, the indoor refrigerant is in a low-temperature state. After the heat exchange of the indoor heat exchanger 30, the low-temperature refrigerant and the indoor air exchange heat, which will cause water in the air to be separated out. The condensed water will adhere to the surface of the heat exchanger 30, and the condensed water will accumulate and drip into the water receiving tray 40 below.

[0059] Reference Figure 3 The air conditioner indoor unit may include a drain pump 50. The drain pump 50 is disposed in the housing 10, and the water suction end of the drain pump 50 faces the water receiving pan 40, and is used to pump the condensed water in the water receiving pan 40, thereby discharging the condensed water.

[0060] The air conditioner indoor unit may include a drain nozzle 60. The drain nozzle 60 is connected to the side wall of the housing 10. The drain nozzle 60 can be fastened to the housing 10 by a fastener such as a screw.

[0061] The water outlet of the drain pump 50 is connected to one end of the drain nozzle 60 inside the shell 10 through a connecting pipe. The other end of the drain nozzle 60 outside the shell 10 is connected to the drain pipe 90.

[0062] The drain pump 50 draws the condensed water in the water pan 40 and sends it to the drain nozzle 60 on the side of the shell 10, and then discharges it through the drain pipe 90.

[0063] In some application scenarios, the drain pipe 90 has a vertically extending part. The condensed water needs to flow upward to be discharged.

[0064] Continuing to refer to Figure 3 , the drain pipe 90 includes a connecting pipe 91. One end of the connecting pipe 91 is connected to the drain nozzle 60. The connecting pipe 91 extends substantially horizontally.

[0065] The drain pipe 90 includes a lifting pipe 92. The lifting pipe 92 is connected to the other end of the connecting pipe 91. The lifting pipe 92 extends substantially vertically.

[0066] The condensed water flows upward at the lifting pipe 92 of the drain pipe 90. When the drain pump 50 stops running, the condensed water in the lifting pipe 92 loses driving force and flows backward to the water pan 40.

[0067] To solve the problem of backward flow of condensed water, in the embodiments of the present application, referring to Figures 4 to 10 , the air conditioner indoor unit can include a check member 70 connected at the drain nozzle 60 for preventing the condensed water from flowing backward.

[0068] The check member 70 includes a valve body 71. The valve body 71 is generally cylindrical, and forms the appearance of the check member 70.

[0069] Figure 5 And Figure 6 the direction of the arrow in the figure shows the direction of the water entering the check member 70, and the two ends of the axial direction of the valve body 71 are respectively formed with an inlet 711 and an outlet 712. The condensed water can flow into the valve body 71 through the inlet 711. The condensed water can flow out of the valve body 71 through the outlet 712.

[0070] Specifically referring to Figure 8 and Figure 9 , the check member 70 includes a duckbill valve core 72. The duckbill valve core 72 is connected in the valve body 71. The duckbill valve core 72 has opposite inlet end 721 and outlet end 722.

[0071] The inlet end 721 of the duckbill valve core 72 is connected to the inner wall of the valve body 71. The outlet end 722 of the duckbill valve core 72 is farther away from the inlet 711 than the inlet end 721.

[0072] The outlet end 722 of the duckbill valve core 72 is closed in the natural state ( Figure 8 When water flows from the inlet end 721 of the duckbill valve core 72 to the outlet end 722 of the duckbill valve core 72, the outlet end 722 is opened by the impact of the water flow to form a drainage channel 72a ( Figure 9 status shown).

[0073] When water flows back from the drain pipe 90 , the outlet end 722 of the duckbill valve core 72 is in a closed state, thereby preventing water from flowing back into the water receiving tray 40 .

[0074] In an embodiment of the present application, a check member 70 is connected to the drain nozzle 60, and the check member 70 includes a valve body 71 and a duckbill valve core 72 connected to the valve body 71, and the inner wall of the outlet end 722 of the duckbill valve core 72 is opened outward under the impact of the drainage water flow to form a drainage channel 72a for drainage. When the drainage flows back, the backflow water flows onto the outer wall surface of the outlet end 722, and the outlet end 722 cannot open, the drainage channel 72a is closed, and the backflow water flow is blocked, thereby avoiding the backflow of condensed water.

[0075] In addition, as long as there is a little water pressure, the outlet end 722 of the duckbill valve core 72 can be flushed open by the water flow, avoiding the problem in the prior art that a large water pressure is required to open the one-way valve.

[0076] In addition, the check piece 70 is installed at the drain nozzle 60. During inspection and maintenance, it is only necessary to remove the drain pipe 90 from the drain nozzle 60 and then pull out the check piece 70 without damaging the pipeline.

[0077] The duckbill valve core 72 may be made of a flexible material. When the drainage pump 50 is turned on to drain water, the inner wall of the duckbill valve core 72 is impacted by the water pressure, causing the duckbill valve core 72 to elastically deform and open.

[0078] When the drain pump 50 is turned off, the impact force of the backflow water acts on the outer surface of the duckbill valve core 72. The inner wall of the duckbill valve core 72 does not withstand the outward water pressure, so the duckbill valve core 72 does not undergo elastic deformation to open outward.

[0079] When the water pressure of the condensed water is constant, the stress of the elastic deformation of the duckbill valve core 72 can be designed by selecting the material, thickness or shape of the duckbill valve core 72 .

[0080] In some embodiments, reference Figure 9 The duckbill valve core 72 includes a base 723. The base 723 is cylindrical and gradually narrows from the inlet end 721 to the outlet end 722. That is, the base 723 gradually converges from the inlet end 721 to the outlet end 722. The base 723 can converge and guide the water flow, thereby increasing the impact pressure of the water flow.

[0081] The duckbill valve core 72 comprises a petal portion connected to the converging end of the base portion 723. The petal portion is formed by pressing two half-cylinder side walls of the cylinder towards the center.

[0082] The connection between the petal portion and the base portion 723 can have a smooth transition portion, so that the flow channel of the duckbill valve core 72 is smooth and unobstructed.

[0083] The petal portion can be divided into a first petal 724 and a second petal 725 by the inner wall of the petal portion. The first petal 724 and the second petal 725 form a duckbill-shaped opening and closing port. When the duckbill valve core 72 is not deformed, the first petal 724 and the second petal 725 are in close contact, and the valve body 71 is closed; when the duckbill valve core 72 is deformed, the first petal 724 and the second petal 725 move away from each other, and the interior of the valve body 71 is connected.

[0084] In some embodiments, referring to Figure 5 and Figure 10 , the check valve 70 further comprises a sound-absorbing sheet 73. The sound-absorbing sheet 73 is connected at the flow outlet 712 of the valve body 71. The sound-absorbing sheet 73 can be provided with a plurality of sound-absorbing holes 731.

[0085] The sound-absorbing sheet 73 allows the drainage to flow out, buffers the drainage, and avoids the noise generated when the water flow concentrates and falls into the connecting pipeline 91 of the drainage pipe 90. In addition, when the drainage flows back, gas is carried, which generates bubble flow noise. The sound-absorbing sheet 73 can effectively improve the separation effect of water flow and bubbles, and further reduce the generation of noise.

[0086] In some embodiments, the sound-absorbing sheet 73 is in the shape of a rectangular sheet, and the two ends of the length direction are connected to the valve body 71. The sound-absorbing sheet 73 divides the flow outlet 712 into a first flow outlet 713 and a second flow outlet 714. The first flow outlet 713 and the second flow outlet 714 can be symmetrical with respect to the sound-absorbing sheet 73.

[0087] In some embodiments, on the projection in the plane of the flow outlet 712, the outlet end 722 of the duckbill valve core 72 is located within the outer contour of the sound-absorbing sheet 73. In this way, the blocking effect of the sound-absorbing sheet 73 on the backflow can weaken the impact of the backflow on the end surface of the outlet end 722, to ensure the reliability of the outlet end 722 in the closed state.

[0088] In some embodiments, the length direction of the sound-absorbing sheet 73 is perpendicular to the opening direction of the outlet end 722 of the duckbill valve core 72. The arrangement direction of the first flow outlet 713 and the second flow outlet 714 is the same as the opening direction of the outlet end 722.

[0089] Assuming that the first flap 724 and the second flap 725 are arranged in a vertical direction, when the inner wall of the duckbill valve core 72 is impacted by the drainage water flow, the first flap 724 moves upward and deforms, while the second flap 725 moves downward and deforms. The first flap 724 and the second flap 725 open in the vertical direction.

[0090] Then, the longitudinal direction of the sound-absorbing sheet 73 is the lateral direction.

[0091] The first outflow port 713 is located on the upper side of the sound-absorbing plate 73 , and the second outflow port 714 is located on the lower side of the sound-absorbing plate 73 .

[0092] When the drainage flows back, part of the backflow water flows into the valve body 71 from the first flow outlet 713, and this part of the water flows continues to flow toward the duckbill valve core 72, and generally flows to the upper side of the first flap 724; part of the backflow water flows into the valve body 71 from the second flow outlet 714, and this part of the water flows continues to flow toward the duckbill valve core 72, and generally flows to the lower side of the second flap 725. Therefore, the backflow water will make the first flap 724 and the second flap 725 fit more tightly, thereby effectively blocking the backflow of condensed water to the water receiving tray 40.

[0093] In some embodiments, on the projection of the end face where the outflow port 712 is located, the area of ​​the muffler plate 73 is no more than half the area of ​​the outflow port 712, so as to avoid the muffler plate 73 having a larger area causing too much resistance to the drainage flow and affecting the normal outflow of the drainage.

[0094] In some embodiments, the duckbill valve core 72 and the valve body 71 are integrally formed. The integral formation of the duckbill valve core 72 and the valve body 71 eliminates the need for a connecting structure, thereby further improving the reliability of the check member 70 and ensuring a non-return effect.

[0095] In some embodiments, the muffler sheet 73 is integrally formed with the valve body 71. The integral formation of the muffler sheet 73 and the valve body 71 enhances the strength of the joint against water flow impact and ensures the diversion effect of the muffler sheet 73.

[0096] In some embodiments, reference Figure 7 and Figure 10 A plurality of first guide grooves 715 are provided on the inner wall of the valve body 71. The first guide grooves 715 enhance the flow rate of the drainage water when it adheres to the wall, so that the condensed water is discharged quickly and effectively.

[0097] The first guide groove 715 extends along the axial direction of the valve body 71 , that is, the length direction of the first guide groove 715 is in the same direction as the drainage water flow, so as to better guide the outflow of the drainage water flow.

[0098] The first guide groove 715 can be configured as a groove with an arc-shaped inner wall, which can improve the smoothness of the flow of drainage water.

[0099] The curved grooves can reduce the accumulation of foreign matter such as dust and reduce the risk of blockage.

[0100] The plurality of first guide grooves 715 are evenly distributed along the circumference. The provision of the first guide grooves 715 maximizes the inner cavity area of ​​the valve body 71 while ensuring the structural strength of the valve body 71, thereby improving drainage efficiency.

[0101] In some embodiments, the first flow guide groove 715 extends from the inlet 711 to the outlet 712 of the valve body 71 . A notch is provided on the first flow guide groove 715 to avoid the connection position between the duckbill valve core 72 and the valve body 71 .

[0102] In some embodiments, a plurality of second flow guiding grooves 726 are provided on the inner wall of the duckbill valve core 72 to increase the flow velocity of the water and enable the water to be discharged effectively. The second flow guiding grooves 726 extend along the direction of the water flow.

[0103] The second guide groove 726 may be an arc-shaped groove, which may improve the smoothness of the flow of drainage water, reduce the accumulation of foreign matter such as dust, and reduce the risk of blockage.

[0104] The inflow end of the second guide groove 726 can be connected to the outflow end of the first guide groove 715 to ensure the continuity of the drainage water flow along the wall.

[0105] The outer side of the duckbill valve core 72 is a smooth surface. When the condensed water flows back, the smooth surface can effectively block the backflow of condensed water and prevent the duckbill valve core 72 from being excessively deformed.

[0106] In some embodiments, the check member 70 is inserted into the drain nozzle 60. During assembly, it is only necessary to insert the inlet 711 of the check member 70 toward the drain nozzle 60 without the need for gluing, hot melting, or other operations.

[0107] During on-site installation, insert the check piece 70 into the drain nozzle 60, then slide the drain pipe 90 over the drain nozzle 60 and securely connect the drain pipe 90 to the drain nozzle 60 with a clamp or cable tie. For inspection and maintenance, simply loosen the clamp or cable tie on the drain pipe 90, remove the drain pipe 90 from the drain nozzle 60, and pull out the check piece 70 for inspection and cleaning.

[0108] For products that have been installed in the early stage, it is only necessary to dismantle the drain pipe 90 and push the non-return piece 70 into the drain nozzle 60, which can improve the on-site installation efficiency and save labor costs; there is no need to destroy the original drainage pipe on site, and there is no need to damage the on-site drainage pipe insulation pipe. At the same time, it also reduces the condensation water problem caused by the rupture of the insulation pipe, improves the installation reliability, reduces the property loss caused by poor installation of the drain pipe, reduces the equipment warranty caused by poor drainage, and reduces the air conditioning use, repair and maintenance costs of users or manufacturers.

[0109] In some embodiments, reference Figure 8 In the direction from the inlet 711 to the outlet 712 , the outer diameter of at least the portion of the valve body 71 close to the inlet 711 gradually increases.

[0110] The outer peripheral surface of at least a portion of the valve body 71 close to the inlet 711 is a tapered surface 717 a , and the outer diameter of the inlet end of the valve body 71 is the smallest.

[0111] This facilitates the plugging operation of the inflow end of the valve body 71 into the drain nozzle 60 .

[0112] In some embodiments, a plurality of ribs 716 for draining water are provided on the outer periphery of the valve body 71 at intervals along the axial direction of the valve body 71. The ribs 716 are located on a side of the valve body 71 close to the outflow port 712.

[0113] The rib 716 is formed by a portion of the outer peripheral surface of the valve body 71 protruding outward.

[0114] The rib 716 increases the interference fit between the valve body 71 and the drain nozzle 60 , thereby increasing the friction resistance between the check member 70 and the drain nozzle 60 , thereby preventing the check member 70 from being impacted by water flow and falling off during use.

[0115] The contact area between the rib 716 and the drain nozzle 60 is relatively small, so as to avoid the interference length between the rib 716 and the drain nozzle 60 being too large, thereby increasing the difficulty of installing the check member 70 to the drain nozzle 60.

[0116] The ribs 716 are arranged at intervals along the axial direction of the valve body 71, so that when the check member 70 is installed in the drain nozzle 60, the ribs 716 are squeezed by the inner wall of the drain nozzle 60 and can undergo axial deformation, thereby avoiding the problem that the ribs 716 have no axial deformation space and can only undergo radial deformation, resulting in a reduction in the inner cavity space of the valve body 71 and affecting the flow space of the drainage water flow.

[0117] In some embodiments, combined Figure 6 The valve body 71 includes a first valve body portion 717. The first valve body portion 717 is inserted into the drain nozzle 60. One end of the first valve body portion 717 forms an inlet 711.

[0118] The valve body 71 includes a second valve body portion 718. The second valve body portion 718 is connected to an end of the first valve body portion 717 that is away from the inlet 711. The second valve body portion 718 is located outside the drain nozzle 60.

[0119] The outer diameter of the second valve body portion 718 is larger than that of the first valve body portion 717. The first valve body portion 717 and the second valve body portion 718 form a step shape.

[0120] The stepped surface 718 a of the second valve body portion 718 , ie, the side surface close to the first valve body portion 717 , abuts against the end of the drain nozzle 60 .

[0121] During installation, when the second valve body portion 718 abuts against the drain nozzle 60 , it indicates that the check member 70 is assembled in place.

[0122] During disassembly, the second valve body portion 718 can be used to pull out the check member 70 .

[0123] In some embodiments, reference Figure 8 The outer peripheral surface of the first valve body 717 includes a conical surface 717a and a cylindrical surface 717b. The cylindrical surface 717a is connected to the large diameter end of the conical surface 717a. The cylindrical surface 717b is closer to the second valve body 718 than the conical surface 717a.

[0124] The rib 716 is provided on the cylindrical surface 717b.

[0125] As can be seen from the above, according to the embodiment of the present application, by connecting the check member 70 at the drain nozzle 60, the check member 70 includes a valve body 71 and a duckbill valve core 72 connected to the valve body 71, and the inner wall of the outlet end 722 of the duckbill valve core 72 is opened outward under the impact of the drainage water flow to form a drainage channel 72a for drainage; when the drainage flows back, the backflow water flows act on the outer wall surface of the outlet end 722, the outlet end 722 cannot open, the drainage channel 72a is closed, and the backflow water flow is blocked, thereby avoiding the backflow of condensed water.

[0126] In addition, by setting a silencer 73 at the outflow port 712 of the valve body 71, the silencer 73 allows the drainage to flow out in a diverted manner, which has a buffering effect on the drainage and avoids the noise generated when the water flow falls excessively and concentratedly into the connecting pipe 91 of the drainage pipe 90.

[0127] In addition, when drainage flows back, it carries gas and generates bubble flow noise. The silencer sheet 73 can effectively enhance the separation effect of water flow and bubbles, further reducing noise generation.

[0128] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

[0129] For ease of explanation, the above description has been presented in conjunction with specific embodiments. However, the above exemplary discussion is not intended to be exhaustive or to limit the embodiments to the specific forms disclosed above. Based on the above teachings, various modifications and variations are possible. The above embodiments have been selected and described to better explain the principles and practical applications, thereby enabling those skilled in the art to better utilize the embodiments and various different variations of the embodiments suitable for specific use considerations.

Claims

1. An air conditioner indoor unit, characterized in that: include: case; a heat exchanger, disposed in the housing, for exchanging heat with air passing therethrough; A water receiving tray is provided below the heat exchanger and is used to collect condensed water generated on the heat exchanger; a drainage pump, used to drain the condensed water in the water receiving tray; A drain nozzle is connected to the housing and is in communication with a drain end of the drain pump; A check piece is inserted into the drain nozzle, and the check piece includes: a valve body, the valve body being provided with an inlet for inflow of water and an outlet for outflow of water; A duckbill valve core is arranged in the valve body, the inlet end of the duckbill valve core is connected to the inner wall of the valve body, the outlet end of the duckbill valve core opens under the impact of the drainage water flow to form a drainage channel, and the outlet end of the duckbill valve core is closed when the drainage flows back to prevent the drainage from flowing back.

2. The air conditioner indoor unit according to claim 1, characterized in that: The anti-return member includes: A muffler plate is connected to the outflow port, and a plurality of penetrating muffler holes are provided on the muffler plate.

3. The air conditioner indoor unit according to claim 2, characterized in that: The sound-absorbing plate separates the outflow port into a first outflow port and a second outflow port, and the arrangement direction of the first outflow port and the second outflow port is the same as the opening direction of the outlet end.

4. The air conditioner indoor unit according to claim 2, characterized in that: On the projection of the plane where the outflow outlet is located, the muffler plate partially overlaps with the outflow outlet, and the closed outlet end is located within the outer contour of the muffler plate.

5. The air conditioner indoor unit according to claim 1, characterized in that: A plurality of first flow guide grooves uniformly distributed along the circumferential direction are provided on the inner wall of the valve body, and the first flow guide grooves extend along the axial direction of the valve body.

6. The air conditioner indoor unit according to claim 1, characterized in that: A plurality of second flow guide grooves extending along the drainage direction are provided on the inner wall of the duckbill valve core, and the outer wall surface of the duckbill valve core is a smooth surface.

7. The air conditioner indoor unit according to claim 1, characterized in that: In a direction from the inlet to the outlet, the outer diameter of at least a portion of the valve body close to the inlet gradually increases.

8. The air conditioner indoor unit according to claim 1, characterized in that: A plurality of convex ribs spaced apart in the axial direction are provided on the outer periphery of the valve body, and the convex ribs are located on a side of the valve body close to the outflow port.

9. The air conditioner indoor unit according to claim 1, characterized in that: The valve body comprises: a first valve body, one end of which is provided with the inlet, and the first valve body is inserted into the drain nozzle; The second valve body is connected to an end of the first valve body away from the inlet, and a side wall of the second valve body abuts against an end of the drain nozzle.

10. An air conditioner indoor unit, characterized in that: include: case; a heat exchanger, disposed in the housing, for exchanging heat with air passing therethrough; A water receiving tray is provided below the heat exchanger and is used to collect condensed water generated on the heat exchanger; a drainage pump, used to drain the condensed water in the water receiving tray; A drain nozzle is connected to the housing and is in communication with a drain end of the drain pump; A drain pipe comprising: a connecting pipe connected to the drain nozzle; a lifting pipeline connected to an end of the connecting pipeline away from the drain nozzle, the lifting pipeline extending vertically; A check piece is inserted into the drain nozzle, and the check piece includes: a valve body, the valve body being provided with an inlet for inflow of water and an outlet for outflow of water; A duckbill valve core is arranged in the valve body, the inlet end of the duckbill valve core is connected to the inner wall of the valve body, the outlet end of the duckbill valve core opens under the impact of the drainage water flow to form a drainage channel, and the outlet end of the duckbill valve core is closed in a natural state to prevent the drainage from flowing back.

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