Through-wall air conditioner

Abstract

The utility model belongs to the technical field of air conditioning equipment, and particularly provides a through-wall air conditioner. The utility model aims to solve the problem that the performance of the existing through-wall air conditioner is easily influenced due to freezing of a base plate during heating in winter. Therefore, the through-wall air conditioner comprises an indoor heat exchanger, an outdoor heat exchanger, a chassis and an electric heating device. The base plate is arranged below the indoor heat exchanger and the outdoor heat exchanger, an outdoor water collecting tank and a drainage hole are formed in the portion, below the outdoor heat exchanger, of the base plate, and the drainage hole is used for draining water in the outdoor water collecting tank. The electric heating device is arranged on the outer side of the base plate and fixedly connected with the base plate, and the electric heating device is used for heating the outdoor water collecting tank so as to melt ice in the water collecting tank or prevent water in the water collecting tank from freezing. The through-wall air conditioner with the structure overcomes the technical problems.

Description

Technical Field

[0001] This utility model belongs to the field of air conditioning equipment technology, and specifically provides a through-wall air conditioner. Background Technology

[0002] A through-wall air conditioner is an integrated air conditioning unit that can be installed in a window or in a hole through a wall. It includes a chassis and components such as a compressor, outdoor heat exchanger, outdoor fan, indoor heat exchanger, indoor fan, and throttling components (e.g., electronic expansion valve) mounted on the chassis.

[0003] When a through-wall air conditioner is used for heating in winter, the outdoor heat exchanger acts as an evaporator, producing condensate during operation. This condensate drains outdoors through a drain hole on the chassis. However, due to the extremely low temperatures in winter, the condensate can easily freeze on the chassis, blocking the drain hole and preventing drainage. Over time, the ice layer thickens, affecting heat exchange between the outdoor heat exchanger and related piping; moreover, the ice layer can come into contact with the outdoor fan, increasing noise during operation, and may even cause the outdoor fan to shatter upon impact with the ice. Utility Model Content

[0004] One objective of this invention is to solve the problem that existing wall-mounted air conditioners are prone to having their performance affected by ice buildup on the chassis during winter heating.

[0005] To achieve the above objectives, this utility model provides a through-wall air conditioner, comprising:

[0006] Indoor heat exchanger;

[0007] Outdoor heat exchanger;

[0008] A chassis is located below the indoor heat exchanger and the outdoor heat exchanger. The portion of the chassis located below the outdoor heat exchanger is provided with an outdoor water collection tank and a drain hole. The drain hole is used to drain the water in the outdoor water collection tank.

[0009] An electric heating device is installed on the outside of the chassis and fixedly connected to the chassis. The electric heating device is used to heat the outdoor water collection tank to melt the ice in the outdoor water collection tank or to prevent the water in the outdoor water collection tank from freezing.

[0010] Optionally, an outdoor trough is provided on the chassis, and an outdoor water collection tank is formed in the outdoor trough; the projection of the outdoor heat exchanger on the chassis is located in the outdoor trough, so that condensate from the outdoor heat exchanger falls into the outdoor trough and collects in the outdoor water collection tank.

[0011] Optionally, the electric heating device is arranged around the outdoor water collection tank.

[0012] Optionally, the electric heating device is an electric heating belt, and the electric heating device is coiled around the outdoor water collecting tank for at least two turns.

[0013] Optionally, the electric heating device is arranged in a zigzag manner away from the area of the outdoor water collecting tank.

[0014] Optionally, the electric heating device is bonded, clamped or buckled to the bottom plate.

[0015] Optionally, the drain hole is arranged on the bottom wall of the outdoor water collecting tank.

[0016] Optionally, the outdoor water collecting tank comprises a wide part and a narrow part, and the drain hole is arranged in the narrow part.

[0017] Optionally, the wall-penetrating air conditioner further comprises a drain valve for controlling the opening and closing of the drain hole.

[0018] Optionally, the wall-penetrating air conditioner further comprises a casing, and the indoor heat exchanger, the outdoor heat exchanger, the bottom plate and the electric heating device are arranged in the casing; a gap is defined between the bottom wall of the casing and the bottom plate; and an outlet hole is arranged on the outer side wall of the casing or the outer side end of the bottom wall and communicates with the gap.

[0019] Based on the foregoing description, those skilled in the art can understand that, in the technical solutions of the wall-penetrating air conditioner, the electric heating device fixedly connected to the bottom plate is arranged on the outer side of the bottom plate to heat the outdoor water collecting tank, so as to melt the ice in the outdoor water collecting tank or prevent the water in the outdoor water collecting tank from freezing, thereby ensuring the performance of the wall-penetrating air conditioner in winter and avoiding the impact of the outdoor fan on the ice layer.

[0020] Further, the outdoor sink is arranged on the bottom plate to collect the condensed water falling from the outdoor heat exchanger, the outdoor water collecting tank is formed in the outdoor sink, and the electric heating device surrounds the outdoor water collecting tank, so that the electric heating device can simultaneously heat the water or ice in the outdoor sink and the outdoor water collecting tank through heat conduction when the electric heating device works, thereby effectively avoiding the formation of ice in the outdoor sink and the outdoor water collecting tank.

[0021] Further, the electric heating device is arranged as an electric heating belt coiled around the outdoor water collecting tank for at least two turns, which facilitates the arrangement of the electric heating device. The electric heating device is arranged in a zigzag manner away from the area of the outdoor water collecting tank, so that the electric heating device can uniformly heat the area of the bottom plate having the condensed water, thereby effectively avoiding the formation of ice.

[0022] Further, by setting the outdoor water collecting tank as a wide part and a narrow part, and setting the drain hole in the narrow part, water in the outdoor water collecting tank can be drained as much as possible.

[0023] Further, by setting the sleeve shell outside the indoor heat exchanger, the outdoor heat exchanger, the bottom plate and the electric heating device, the whole wall-mounted air conditioner is more beautiful, and the indoor heat exchanger, the outdoor heat exchanger, the bottom plate and the electric heating device are prevented from being damaged by external force during use. By limiting a gap between the bottom wall of the sleeve shell and the bottom plate, and setting a water outlet hole outside the outer side wall or the outer side end of the bottom wall of the sleeve shell in communication with the gap, the condensate water of the wall-mounted air conditioner can be drained through the drain hole, the gap and the water outlet hole. Moreover, the electric heating device can also heat the condensate water or ice between the sleeve shell and the bottom plate to prevent icing.

[0024] Other beneficial effects of the present utility model will be described in detail in the following with reference to the drawings, so that those skilled in the art can more clearly understand the improvement purpose, features and advantages of the present utility model. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical scheme of the present utility model, the following will describe some embodiments of the present utility model with reference to the drawings. Those skilled in the art should understand that the components or parts indicated by the same reference numerals in different drawings are the same or similar; the drawings of the present utility model are not necessarily drawn to scale with each other. In the drawings:

[0026] Figure 1 is a structure exploded view (first axonometric perspective) of the wall-mounted air conditioner in some embodiments of the present utility model;

[0027] Figure 2 is a structure exploded view (second axonometric perspective) of the wall-mounted air conditioner in some embodiments of the present utility model;

[0028] Figure 3 is an axonometric view (first axonometric perspective) of the wall-mounted air conditioner in some embodiments of the present utility model;

[0029] Figure 4 is an axonometric view (second axonometric perspective) of the wall-mounted air conditioner in some embodiments of the present utility model;

[0030] Figure 5 is Figure 3 is a view of the wall-mounted air conditioner in which the sleeve shell is hidden;

[0031] Figure 6 is Figure 4 is a view of the wall-mounted air conditioner in which the sleeve shell is hidden;

[0032] Figure 7 isFigures 1 to 4 First axonometric view of the middle chassis;

[0033] Figure 8 is Figures 1 to 4 Second axonometric view of the middle chassis.

[0034] BRIEF DESCRIPTION OF DRAWINGS

[0035] 001、Wall-through air conditioner;

[0036] 110、Indoor heat exchanger; 120、Outdoor heat exchanger; 130、Compressor; 140、Middle shell; 150、Inner shell; 160、Indoor fan; 170、Outdoor fan;

[0037] 200、Chassis; 210、Outdoor water collecting tank; 211、Wide part; 212、Narrow part; 220、Drainage hole; 230、Outdoor sink;

[0038] 300、Electric heating device;

[0039] 400、Drainage valve;

[0040] 500、Sleeve; 501、Water outlet hole; 502、Gap; 510、Support rib. DETAILED DESCRIPTION

[0041] Those skilled in the art should understand that the embodiments described below are only a part of the embodiments of the utility model, rather than all the embodiments of the utility model, and the part of the embodiments are intended to explain the technical principles of the utility model, rather than limit the protection scope of the utility model. Based on the embodiments provided by the utility model, all other embodiments obtained by those skilled in the art without creative labor should fall within the protection scope of the utility model.

[0042] It should be noted that in the description of the utility model, the terms "center", "upper", "lower", "top", "bottom", "left", "right", "vertical", "horizontal", "inner", "outer" and other terms indicating direction or positional relationship are based on the direction or positional relationship shown in the drawings, which is only for the convenience of description, and is not indicative or suggestive of the corresponding device or element having a specific orientation, being constructed and operated in a specific orientation, and therefore cannot be understood as limiting the utility model. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicative or suggestive of relative importance.

[0043] Further, it needs to be further pointed out that, in the description of the utility model, unless another explicit provision and limitation, the term "mounting", "connecting", "connection" should be broad sense understanding, for example, can be fixed connection, also can be detachable connection, or integrally connected, can be mechanical connection, also can be electrical connection, can be direct connection, also can be indirectly connected through the intermediate medium, also can be two element internal communication. For the person skilled in the art, the above-mentioned terms can be understood according to the specific meaning in the utility model. For example, the term "mounting", "connecting", "connection" and "fixed" without special description, specifically can be bolted connection, screw connection, welding, insertion, riveting, fusion, clamping and any feasible connection form.

[0044] In addition, it needs to be further pointed out that, in the description of the utility model, the term "cold" and "heat" are two descriptions of the same physical state. That is, the higher the "cold" of a certain target (such as an evaporator, air, condenser, etc.), the lower the "heat" it has, the lower the "cold" it has, the higher the "heat" it has. A certain target absorbs "cold" while releasing "heat", and releases "cold" while absorbing "heat". A certain target saves "cold" or "heat" to keep the target at the current temperature. "Refrigeration" and "heat absorption" are two descriptions of the same physical phenomenon, that is, a certain target (such as an evaporator) absorbs heat while refrigerating.

[0045] As shown in Figures 1 to 6 In some embodiments of the utility model, the through-wall air conditioner 001 includes an indoor heat exchanger 110, an outdoor heat exchanger 120, a chassis 200 and an electric heating device 300.

[0046] As shown in Figure 7 And Figure 8 The chassis 200 is arranged below the indoor heat exchanger 110 and the outdoor heat exchanger 120, and the part of the chassis 200 below the outdoor heat exchanger 120 is provided with an outdoor water collecting tank 210 and a drain hole 220, and the drain hole 220 is used to drain the water in the outdoor water collecting tank 210.

[0047] As shown in Figure 1 , Figure 2 And Figure 5 The electric heating device 300 is arranged outside the chassis 200 and fixedly connected with the chassis 200, and the electric heating device 300 is used to heat the outdoor water collecting tank 210 to melt the ice in the outdoor water collecting tank 210 or prevent the water in the outdoor water collecting tank 210 from freezing.

[0048] The person skilled in the art can understand that the utility model discloses an electric heating device 300 fixedly connected to the bottom plate 200 to heat the outdoor water collecting tank 210, so as to melt the ice in the outdoor water collecting tank 210 or prevent the water in the outdoor water collecting tank 210 from freezing, and ensure the performance of the through-wall air conditioner 001 when heating in winter.

[0049] As Figure 1 , Figure 2 , Figure 5 and Figure 6 As shown in some embodiments of the utility model, the through-wall air conditioner 001 further comprises a compressor 130 and a throttling device (not shown in the figure), so that the indoor heat exchanger 110, the outdoor heat exchanger 120, the compressor 130 and the throttling device constitute a refrigerant circulation system of the through-wall air conditioner 001. The compressor 130 is used to drive the refrigerant to flow through the throttling device and circulate between the indoor heat exchanger 110 and the outdoor heat exchanger 120, so that the through-wall air conditioner 001 cools or heats the indoor environment through the indoor heat exchanger 110.

[0050] The throttling device can comprise an electronic expansion valve and / or a capillary tube.

[0051] It should be noted that the working principle of the through-wall air conditioner 001 for realizing refrigeration and heating by means of the indoor heat exchanger 110, the outdoor heat exchanger 120, the compressor 130 and the throttling device is prior art and is well known to those skilled in the art, so the present application will not be described in detail.

[0052] As Figure 1 , Figure 2 , Figure 5 and Figure 6 As shown in some embodiments of the utility model, the through-wall air conditioner 001 can further comprise a middle shell 140, an inner shell 150, an indoor fan 160 and an outdoor fan 170.

[0053] The middle shell 140 is fixedly connected to the bottom plate 200, and the middle shell 140 can also be used to fix the indoor heat exchanger 110 and / or the outdoor heat exchanger 120.

[0054] The inner shell 150 is installed on the inner side of the middle shell 140 and used to shield the indoor heat exchanger 110. The inner shell 150 is provided with an inner return air inlet and an inner air inlet, so that the air flows to the indoor heat exchanger 110 through the inner return air inlet and flows out through the inner air inlet, thereby realizing the refrigeration or heating of the air by the indoor heat exchanger 110.

[0055] The indoor fan 160 is installed on the side of the middle shell 140 close to the inner shell 150, so as to drive the indoor air to enter from the inner return air inlet and flow out from the inner air inlet after flowing through the indoor heat exchanger 110.

[0056] As can be seen from Figure 1 The middle shell 140 and the inner shell 150 jointly define an air duct adapted to the centrifugal fan. Moreover, the side of the middle shell 140 facing the indoor fan 160 can constitute a volute adapted to the centrifugal fan.

[0057] In addition, in other embodiments of the present application, the indoor fan 160 can be set as any other feasible fan according to the needs of the skilled in the art, such as an axial fan, an inclined flow fan, a cross flow fan, etc.

[0058] The outdoor fan 170 is installed on the side of the middle shell 140 away from the inner shell 150 to drive outdoor air to flow through the outdoor heat exchanger 120, so as to make the outdoor heat exchanger 120 provide heat or cold to the refrigerant circulation system.

[0059] As can be seen from Figure 2 The outdoor fan 170 can be an axial fan.

[0060] In addition, in other embodiments of the present application, the outdoor fan 170 can be set as any other feasible fan according to the needs of the skilled in the art, such as a centrifugal fan, an inclined flow fan, a cross flow fan, etc.

[0061] Further, although not shown in the drawings, in some embodiments of the present application, a motor is further installed in the middle shell 140 to drive the indoor fan 160 and the outdoor fan 170 to rotate.

[0062] Optionally, the motor is a double-output-shaft motor, so that the indoor fan 160 and the outdoor fan 170 are coaxially fixed to the motor, thereby the indoor fan 160 and the outdoor fan 170 can be simultaneously driven to rotate by one motor. In this way, not only the cost is reduced, but also the volume and weight of the whole wall-mounted air conditioner 001 are reduced.

[0063] As shown in Figure 7 and Figure 8 In some embodiments of the present application, an outdoor sink 230 is provided on the bottom plate 200, and the outdoor water collecting groove 210 is formed in the outdoor sink 230. Moreover, the projection of the outdoor heat exchanger 120 on the bottom plate 200 is located in the outdoor sink 230, so that the condensed water from the outdoor heat exchanger 120 falls into the outdoor sink 230 and is gathered into the outdoor water collecting groove 210.

[0064] As can be understood by those skilled in the art, by arranging the outdoor sump 230 on the base 200 for receiving the condensed water falling from the outdoor heat exchanger 120, and arranging the outdoor water collecting groove 210 in the outdoor sump 230, and arranging the electric heating device 300 around the outdoor water collecting groove 210, when the electric heating device 300 is working, the water or ice in the outdoor sump 230 and the outdoor water collecting groove 210 can be heated simultaneously by heat conduction, effectively avoiding the formation of ice in the outdoor sump 230 and the outdoor water collecting groove 210.

[0065] With reference to Figure 7 and Figure 8 , in some embodiments of the present application, the drain hole 220 is arranged on the bottom wall of the outdoor water collecting groove 210, so that the water in the outdoor water collecting groove 210 can be drained as much as possible.

[0066] Further, the bottom wall of the outdoor water collecting groove 210 can be inclined downward toward the direction close to the drain hole 220, so that the water in the outdoor water collecting groove 210 can be drained as much as possible.

[0067] With reference to Figure 7 and Figure 8 , in some embodiments of the present application, the outdoor water collecting groove 210 includes a wide part 211 and a narrow part 212, and the drain hole 220 is arranged in the narrow part 212.

[0068] As shown in Figure 5 , in some embodiments of the present application, the electric heating device 300 is arranged around the outdoor water collecting groove 210. Specifically, the electric heating device 300 is an electric heating tape, and the electric heating device 300 is wound at least two turns around the outdoor water collecting groove 210.

[0069] As can be understood by those skilled in the art, by arranging the electric heating device 300 as an electric heating tape wound at least two turns around the outdoor water collecting groove 210, the arrangement of the electric heating device 300 is facilitated.

[0070] As shown in Figure 1 , Figure 2 and Figure 5 , in some embodiments of the present application, the region of the electric heating device 300 away from the outdoor water collecting groove 210 is arranged in a reciprocating bending manner.

[0071] As can be understood by those skilled in the art, by arranging the region of the electric heating device 300 away from the outdoor water collecting groove 210 in a reciprocating bending manner, the electric heating device 300 can uniformly heat the region of the base 200 having condensed water, effectively avoiding the formation of ice.

[0072] Further, although not shown in the drawings, in some embodiments of the present application, the electric heating device 300 is bonded, clamped or buckled to the bottom plate 200.

[0073] As an example one, the top surface of the electric heating device 300 is provided with glue or double-sided adhesive tape, so that the electric heating device 300 is bonded to the bottom plate 200.

[0074] As an example two, the bottom side of the bottom plate 200 is provided with a clamping groove, and the electric heating device 300 is embedded in the clamping groove and thus clamped to the bottom plate 200.

[0075] As an example three, the bottom side of the bottom plate 200 is provided with a bolted structure, and the electric heating device 300 is bolted to the bolted structure by a binding belt.

[0076] As shown in Figure 1 and Figure 2 , in some embodiments of the present application, the through-wall air conditioner 001 further comprises a drain valve 400 for controlling the opening and closing of the drain hole 220. The drain valve 400 is installed in the narrow part 212 to improve the space utilization of the through-wall air conditioner 001.

[0077] As shown in Figures 1 to 4 , in some embodiments of the present application, the through-wall air conditioner 001 further comprises a sleeve 500, and the indoor heat exchanger 110, the outdoor heat exchanger 120, the bottom plate 200 and the electric heating device 300 are all arranged in the sleeve 500.

[0078] As can be understood by those skilled in the art, by arranging the sleeve 500 outside the indoor heat exchanger 110, the outdoor heat exchanger 120, the bottom plate 200 and the electric heating device 300, the through-wall air conditioner 001 is more aesthetically pleasing as a whole, and the indoor heat exchanger 110, the outdoor heat exchanger 120, the bottom plate 200 and the electric heating device 300 are also prevented from being damaged by external forces during use.

[0079] As can be seen from Figure 4 , the left and right sides of the outdoor heat exchanger 120 and the left and right side walls of the sleeve 500 have a large gap therebetween to form an outdoor air return port, so that air flows through the outdoor heat exchanger 120 under the action of the outdoor fan 170 to provide heat or cold to the outdoor heat exchanger 120.

[0080] As shown in Figure 4 , in some embodiments of the present application, the bottom wall of the sleeve 500 and the bottom plate 200 define a gap 502, and the outer side end of the outer side wall or the bottom wall of the sleeve 500 is provided with a water outlet hole 501 communicating with the gap 502.

[0081] As shown in Figure 2 andFigure 4 As shown, in some embodiments of the present application, the inner bottom wall of the sleeve 500 is provided with a support rib 510 to support the bottom plate 200, and thus a gap 502 is formed between the bottom wall of the sleeve 500 and the bottom plate 200.

[0082] As can be understood by those skilled in the art, by defining the gap 502 between the bottom wall of the sleeve 500 and the bottom plate 200, and providing the water outlet hole 501 on the outer side end of the outer side wall or the bottom wall of the sleeve 500, which communicates with the gap 502, it is ensured that the condensed water of the wall -through air conditioner 001 can be discharged through the drain hole 220, the gap 502 and the water outlet hole 501. And the electric heating device 300 can also heat the condensed water or ice between the sleeve 500 and the bottom plate 200 to prevent icing.

[0083] Optionally, the bottom plate 200 and the components thereon can be directly placed on the support rib 510 in the sleeve 500 to facilitate the installation of the wall -through air conditioner 001. Specifically, when installing the wall -through air conditioner 001, the sleeve 500 can be installed in the hole penetrating the wall or installed on the window, and then the bottom plate 200 and the components thereon can be installed in the sleeve 500.

[0084] It should be noted that in the description of the present application, both the terms "condensed water" and "water" appear at the same time, in order to make those skilled in the art more easily understand the technical scheme of the present application. Among them, the term "condensed water" is intended to explain the cause of the generation of water in the wall -through air conditioner 001, which is caused by condensation. The term "water" is intended to describe the characteristics related to the freezing, thawing and drainage of the condensed water.

[0085] Based on the foregoing description, those skilled in the art can understand that the wall -through air conditioner 001 of the present application can heat the bottom plate 200 by the electric heating device 300 when heating in winter, and melt the ice on the upper side of the bottom plate 200 and the lower side of the bottom plate 200, or avoid the water on the upper and lower sides of the bottom plate 200 from freezing, so that the condensed water left on the outdoor heat exchanger 120 can flow out through the drain hole 220 on the bottom plate 200, the gap 502 between the bottom plate 200 and the sleeve 500 and the water outlet hole 501 on the sleeve 500. At the same time, it also avoids the impact of the outdoor fan 170 to the ice layer.

[0086] Further, although not shown in the figure, in some embodiments of the present application, the wall -through air conditioner 001 can also include an outdoor temperature sensor to detect the outdoor temperature through the outdoor temperature sensor, and when the outdoor temperature is lower than the preset temperature (for example, 2℃, 1℃, -1℃, -2℃, -5℃, etc.), the electric heating device 300 is powered on.

[0087] Thus far, the technical solutions of the present application have been described in combination with the foregoing embodiments, but it is easily understood by those skilled in the art that the protection scope of the present application is not limited to these specific embodiments. On the premise of not deviating from the technical principles of the present application, those skilled in the art can disassemble and combine the technical solutions in the above-described embodiments, or can make equivalent changes or replacements to the related technical features, and any changes, equivalent replacements, improvements, etc. made within the technical concept and / or technical principles of the present application will fall within the protection scope of the present application.

Claims

1. A wall-through type air conditioner, characterized by comprising: The wall-through type air conditioner comprises: an indoor heat exchanger; an outdoor heat exchanger; a bottom plate arranged below the indoor heat exchanger and the outdoor heat exchanger, a portion of the bottom plate below the outdoor heat exchanger being provided with an outdoor water collecting tank and a drain hole for draining water in the outdoor water collecting tank; an electric heating device arranged outside the bottom plate and fixedly connected with the bottom plate, the electric heating device being used for heating the outdoor water collecting tank to melt ice or prevent water in the outdoor water collecting tank from freezing.

2. The wall-through type air conditioner according to claim 1, wherein: the bottom plate is provided with an outdoor sink, and the outdoor water collecting tank is formed in the outdoor sink; a projection of the outdoor heat exchanger on the bottom plate is located in the outdoor sink, so that condensed water from the outdoor heat exchanger falls into the outdoor sink and flows into the outdoor water collecting tank.

3. The wall-through type air conditioner according to claim 2, wherein: the electric heating device is arranged around the outdoor water collecting tank.

4. The wall-through type air conditioner according to claim 3, wherein: the electric heating device is an electric heating belt, and the electric heating belt is wound around the outdoor water collecting tank for at least two turns.

5. The wall-through type air conditioner according to claim 4, wherein: areas of the electric heating device away from the outdoor water collecting tank are arranged in a reciprocating bending manner.

6. The wall-through type air conditioner according to any one of claims 1 to 5, wherein: the electric heating device is bonded, clamped or crimped with the bottom plate.

7. The wall-through type air conditioner according to any one of claims 1 to 5, wherein: the drain hole is arranged on a bottom wall of the outdoor water collecting tank.

8. The wall-through type air conditioner according to claim 7, wherein: the outdoor water collecting tank comprises a wide portion and a narrow portion, and the drain hole is arranged in the narrow portion.

9. The wall-through type air conditioner according to claim 8, further comprising a drain valve for controlling opening and closing of the drain hole.

10. The wall-through type air conditioner according to any one of claims 1 to 5, further comprising a casing, wherein: the indoor heat exchanger, the outdoor heat exchanger, the bottom plate and the electric heating device are arranged in the casing; a gap is defined between a bottom wall of the casing and the bottom plate; and an outer side wall of the casing or an outer side end of the bottom wall is provided with a water outlet hole in communication with the gap. ​

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