Energy-saving vertical air circulating machine with double-axle motor and double fans

Abstract

The present invention relates to an energy-saving vertical air circulating machine with a double-axle motor and double fans, which comprises: a housing, an indoor air supply part provided on the upper part of the front face, an indoor air exhaust port provided on each lower part of the two side faces, a first outdoor air supply port, a second outdoor air supply port and an outdoor air exhaust port provided on the upper part of the rear face; a first heat exchange device and a second heat exchange device, which are respectively located on the lower part of the indoor side of the housing, and respectively realize the heat exchange of indoor air and outdoor air; an air supply double fan assembly for generating air flow to supply external air to the indoor through the indoor air supply part; an exhaust fan assembly for generating air flow to exhaust indoor air to the outdoor through the outdoor air exhaust port; a first rear side air supply pipe provided on the rear face of the indoor side of the housing to guide the external air supplied to the first outdoor air supply port to flow into the first heat exchange device; a second rear side air supply pipe; and a flow path forming exhaust pipe.

Description

Technical Field

[0001] This invention relates to an energy-saving vertical air circulator applicable to dual-shaft motors and dual fans. Background Technology

[0002] Typically, when a building's interior and exterior are not properly ventilated, prolonged indoor activity can lead to air pollution and increased CO2 levels, making it difficult to maintain a comfortable environment. Therefore, ventilation is necessary. Opening windows allows pollutants to enter, and heat loss also occurs. The solution to this problem is a ventilation system with heat exchange components (also known as an air circulator).

[0003] Korean Patent Publication No. 10-2019-0122074 (published on October 29, 2019) (hereinafter referred to as the prior art) is an example of a ventilation system, which includes: an electric heat exchanger installed on the wall of a building; an outdoor air inflow pipe connecting the electric heat exchanger to the interior of the building so that outdoor air passing through the electric heat exchanger flows into the interior; and an indoor air exhaust pipe connecting the electric heat exchanger to the interior of the building so that indoor air passes through the electric heat exchanger to be exhausted to the outside.

[0004] However, in the existing technology, the electric heating exchanger is set on the wall of the building to connect with the outside. It is connected to the indoor environment by setting outdoor air inlet pipes and indoor air outlet pipes in the electric heating exchanger. Therefore, the piping structure becomes complicated and difficult to install. Moreover, when it is installed in an existing building, the installation will be even more difficult. Summary of the Invention

[0005] The present invention addresses the aforementioned problems and aims to provide an energy-saving vertical air circulator with dual-shaft motors and dual fans, which improves the ventilation efficiency of indoor air in buildings and is easily installed in new buildings and existing school buildings.

[0006] To achieve the above objectives, the present invention provides an energy-saving vertical air circulator applicable to a dual-axis motor and dual-fan design, comprising: a housing with an indoor air supply section disposed on the upper front part, indoor exhaust ports disposed on the lower parts of both sides, and a first outdoor air supply port, a second outdoor air supply port, and an outdoor exhaust port disposed on the upper rear surface; a first heat exchange device and a second heat exchange device, respectively located on the lower sides of the inner side of the housing, for realizing heat exchange between indoor and outdoor air respectively; an air supply dual-fan assembly, located on the upper part of the inner side of the housing, for generating air supply flow to supply outdoor air to the room through the indoor air supply section; and an exhaust fan assembly, located below the air supply dual-fan assembly, for generating exhaust flow to exhaust air through the outdoor side. The system includes an exhaust pipe that discharges indoor air to the outside; a first rear air supply pipe located on the inner rear side of the housing, which guides the outside air supplied to the first outdoor air supply port into the first heat exchange device; a second rear air supply pipe located on the inner rear side of the housing, which guides the outside air supplied to the second outdoor air supply port into the second heat exchange device; and a flow path forming exhaust pipe located on the inner side of the housing, which guides the indoor air that has passed through multiple indoor exhaust ports and the first and second heat exchange devices to flow to the exhaust fan assembly, and forms a first front flow path and a second front flow path along the outer sides to allow the outdoor air that has passed through the first and second heat exchange devices to flow into the air supply dual fan assembly. Attached Figure Description

[0007] Figure 1 A perspective view illustrating an embodiment of the energy-saving vertical air circulator of the present invention, which is applicable to a dual-axis motor and dual-fan system.

[0008] Figure 2 This is a front perspective view showing an embodiment of the energy-saving vertical air circulator of the present invention with the outer side removed.

[0009] Figure 3 The rear perspective view shows an embodiment of the energy-saving vertical air circulator of the present invention with the outer casing removed.

[0010] Figure 4 A front sectional view illustrating an example of an energy-saving vertical air circulator with dual shaft motors and dual fans according to the present invention. Detailed Implementation

[0011] Hereinafter, with reference to the accompanying drawings, embodiments of the energy-saving vertical air circulator applicable to dual-shaft motors and dual fans of the present invention will be described.

[0012] like Figure 1 , Figure 2 , Figure 3 and Figure 4As shown, an embodiment of the energy-saving vertical air circulator applicable to dual-axis motors and dual fans of the present invention includes a housing 10, a first heat exchange device 20, a second heat exchange device 30, an air supply dual-fan assembly 40, an exhaust fan assembly 50, a first rear air supply pipe 60, a second rear air supply pipe 70, and a flow path forming exhaust pipe 80.

[0013] In the outer casing 10, an indoor air supply unit 11 is provided at the upper front part, an indoor exhaust port 12 is provided at the lower part of each of the two sides, and a first outdoor air supply port 13, a second outdoor air supply port 14 and an outdoor exhaust port 15 are provided at the upper rear surface.

[0014] As an example of the outer casing 10, the outer casing 10 is a hexahedron shape composed of a front panel, a rear panel, a left panel, a right panel, a top panel, and a bottom panel. An indoor air supply section 11 is provided on the upper part of the front panel 16, indoor exhaust ports 12 are respectively provided on the lower parts of the side panels 17, and a first outdoor air supply port 13, a second outdoor air supply port 14, and an outdoor exhaust port 15 are provided on the upper part of the rear panel 18. Preferably, the first outdoor air supply port 13 and the second outdoor air supply port 14 are spaced apart horizontally, and the outdoor exhaust port 15 is located between the first outdoor air supply port 13 and the second outdoor air supply port 14. Outdoor air flows in through the first outdoor air supply port 13 and the second outdoor air supply port 14, and indoor air is discharged through the outdoor exhaust port 15. Preferably, a device mounting member 1 is provided at the lower part of the side panel 17 for inserting or removing a heat exchange device into the housing, and a cover plate 2 is provided to cover the device mounting member 1, with multiple exhaust ports 3 provided on the cover plate 2. The cover plate 2 and the multiple exhaust ports 3 provided on the cover plate 2 constitute an indoor side exhaust port 12.

[0015] The first heat exchange device 20 is located on the lower side of the inner side of the housing 10, adjacent to the side panel 17, for heat exchange between indoor air and outdoor air.

[0016] The first heat exchanger 20 has a set height and is shaped like a quadrilateral prism with a quadrilateral cross-section. When installed inside the housing 10, the first heat exchanger 20 exchanges heat with the outside air by allowing outdoor air to flow towards the front panel 16 and rear panel 18 of the housing 10, and with indoor air flowing towards the side panels 17. The first heat exchanger 20 is inserted into or exits from the housing 10 with the cover 2 of the indoor exhaust port 12 separated from the side panel 17. A filter unit (not shown) is provided on the side of the first heat exchanger 20 where outdoor air flows in.

[0017] The second heat exchanger 30 is located on the lower inner side of the housing 10, adjacent to the side panel 17, and is used for heat exchange between indoor air and outdoor air. The second heat exchanger 30 has a set height and is in the form of a quadrilateral prism with a quadrilateral cross-section.

[0018] Preferably, the second heat exchanger 30 has the same size and shape as the first heat exchanger 20. The second heat exchanger 30 allows outdoor air to flow towards the front panel 16 and rear panel 18, and indoor air to flow towards the side panels 17 for heat exchange. The second heat exchanger 30 is inserted into or drawn out of the housing 10 with the cover 2 of the indoor exhaust port 12 of the separated side panel 17 in the open state. A filter unit (not shown) is provided on the side of the second heat exchanger 30 where outdoor air flows in.

[0019] The air supply dual fan assembly 40 is located on the upper part of the inner side of the housing 10 and generates air supply flow to supply outside air to the room through the indoor side air supply section 11.

[0020] As an example of the dual-fan air supply assembly 40, the dual-fan air supply assembly 40 includes: a dual-shaft rotary motor 41; a first air supply fan 42, coupled to one side of the motor shaft of the dual-shaft rotary motor 41; and a second air supply fan 43, coupled to the other side of the motor shaft of the dual-shaft rotary motor 41. The first air supply fan 42 and the second air supply fan 43 each include an intake inlet and an exhaust outlet. As an example of the first air supply fan 42, preferably, the first air supply fan 42 is a multi-blade fan. Preferably, the second air supply fan 43 has the same size and shape as the first air supply fan 42. Preferably, the dual-fan air supply assembly 40 is installed above the exhaust pipe 80 forming the flow path.

[0021] The exhaust fan assembly 50 is located below the air supply dual fan assembly 40 and generates exhaust flow to discharge indoor air to the outside through the outdoor exhaust port 15.

[0022] As an example of an exhaust fan assembly 50, the exhaust fan assembly 50 includes: a single-axis rotary motor 51; and an exhaust fan 52, which is coupled to the motor shaft of the single-axis rotary motor 51. Preferably, the exhaust fan assembly 50 is installed on the upper part of the flow path forming the exhaust pipe 80. The exhaust fan 52 includes: a fan housing 4, with intake ports on both sides and an exhaust port on the outer circumferential surface; an annular first blade support plate 5 and a second blade support plate 6, disposed inside the fan housing 4 and spaced apart from each other; a shaft coupling plate 7, located between the first blade support plate 5 and the second blade support plate 6; a plurality of first blades 8, spaced apart along the circumferential direction between the first blade support plate 5 and the shaft coupling plate 7; and a plurality of second blades 9, spaced apart along the circumferential direction between the second blade support plate 6 and the shaft coupling plate 7. The single-axis rotary motor 51 is located next to the intake port on one side of the fan housing 4, and the motor shaft passes through the intake port to be coupled to the shaft coupling plate 7.

[0023] The first rear air supply pipe 60 is located on the inner rear side of the housing 10, guiding the external air supplied to the first outdoor air supply port 13 into the first heat exchange device 20.

[0024] As an example of the first rear air supply pipe 60, the first rear air supply pipe 60 includes a curved panel with a cross-section in the shape of a U and a predetermined length. The curved panel is vertically attached to the inner rear panel of the housing 10, forming a four-sided passage together with the rear panel. A connecting hole 61 communicating with the first heat exchange device 20 is provided at the lower part of the curved panel, and a first outdoor air supply port 13 is provided at the upper part.

[0025] The second rear air supply pipe 70 is located inside the rear of the housing 10, guiding the external air supplied to the second outdoor air supply port 14 into the second heat exchange device 30.

[0026] As an example of the second rear air supply pipe 70, the second rear air supply pipe 70 includes a curved panel with a U-shaped cross-section and a predetermined length. The curved panel is vertically attached to the inner rear panel of the housing 10, forming a four-sided passage together with the rear panel. A connecting hole 71 communicating with the second heat exchange device 30 is provided at the lower part of the curved panel, and a second outdoor air supply port 14 is provided at the upper part. Preferably, the second rear air supply pipe 70 has the same size and shape as the first rear air supply pipe 60.

[0027] The flow path forming exhaust pipe 80 is located inside the housing 10, guiding indoor air that passes through multiple indoor exhaust ports 12 and the first heat exchange device 20 and the second heat exchange device 30 to flow to the exhaust fan assembly 50, and forming a first front flow path F1 and a second front flow path F2 on the outer sides so that outdoor air that has passed through the first heat exchange device 20 and the second heat exchange device 30 flows into the air supply dual fan assembly 40.

[0028] As an example of a flow path forming exhaust pipe 80, the flow path forming exhaust pipe 80 includes: a main pipe section 81, located vertically between a first heat exchange device 20 and a second heat exchange device 30, and communicating with both the first heat exchange device 20 and the second heat exchange device 30; a plurality of lower connecting holes 82, respectively formed on the upper side plates of the main pipe section 81; a plurality of vertical plate sections 83, extending vertically from the upper ends of the side plates of the main pipe section 81; fan connecting holes 84, respectively formed on the plurality of vertical plate sections 83; and a conduit section 85, which is connected to the vertical plate sections 83, so that the lower connecting holes 82 communicate with the fan connecting holes 84. The main pipe section 81 has a quadrilateral cross-section, and device connecting holes communicating with the first heat exchange device 20 and the second heat exchange device 30 are respectively provided on the two lower side plates of the main pipe section 81. Preferably, the upper ends of the plurality of vertical plate sections 83 are connected to and fixed to the upper panel of the housing 10.

[0029] When the exhaust fan assembly 50 operates to generate exhaust flow, the indoor air passing through the first heat exchange device 20 flows to the exhaust fan of the exhaust fan assembly 50 through the one-side device connection hole - main pipe 81 - one-side lower connection hole 82 - one-side duct 85 - one-side fan connection hole 84, and the indoor air passing through the second heat exchange device 30 flows to the exhaust fan of the exhaust fan assembly 50 through the other-side device connection hole - main pipe 81 - other-side lower connection hole 82 - other-side duct 85 - other-side fan connection hole 84.

[0030] On the other hand, a first front-side flow path F1 is formed by the flow path through the outer surface of one side duct portion 85 of the exhaust pipe 80, a portion of the inner surface of one side panel 17 of the housing 10, and a portion of the front panel of the housing 10. A second front-side flow path F2 is formed by the flow path through the outer surface of the other side duct portion 85 of the exhaust pipe 80, a portion of the inner surface of the other side panel 17 of the housing 10, and a portion of the front panel of the housing 10.

[0031] Preferably, a dual-fan air supply assembly 40 is installed on the upper part of the plurality of vertical plate portions 83. In the dual-fan air supply assembly 40, a first air supply fan 42 is installed on the outer side of one vertical plate portion 83, a second air supply fan 43 is installed on the outer side of the other vertical plate portion 83, and a dual-axis rotary motor 41 is installed between the two vertical plate portions 83. In this case, the exhaust ports of the first air supply fan 42 and the second air supply fan 43 face the front panel side of the housing 10.

[0032] An exhaust fan assembly 50 is mounted on multiple vertical plate sections 83 below the air supply dual fan assembly 40. In the exhaust fan assembly 50, the fan housing 4 of the exhaust fan 52 is coupled between two of the multiple vertical plate sections 83. The suction inlets on both sides of the fan housing 4 communicate with the fan communication holes 84 of the two vertical plate sections 83, respectively. The exhaust outlet of the fan housing 4 is located on the rear panel 18 side of the housing 10 and communicates with the outdoor exhaust port 15. In this configuration, a single-axis rotary motor 51 is located inside one side duct section 85.

[0033] Preferably, a support plate 86 is provided between multiple vertical plate portions 83. At the lower part of the support plate 86, the fan cover 4 of the exhaust fan assembly 50 is connected through and supported. At the upper part of the support plate 86, the dual-axis rotary motor 41 of the air supply dual fan assembly 40 is connected through and supported.

[0034] Preferably, a bypass unit 90 is also provided in the exhaust pipe 80 to allow indoor air to bypass the first heat exchanger 20 and the second heat exchanger 30 and instead bypass the exhaust fan assembly 50. As an example of the bypass unit 90, the bypass unit 90 includes: a plurality of bypass holes 91, respectively disposed on both sides of the housing 10; a bypass pipe 92 connecting the bypass holes 91 to the exhaust pipe 80; and an opening / closing unit 93 for opening and closing the bypass pipe 92. That is, one bypass pipe 92 connects the bypass hole 91 disposed on one side panel 17 of the housing 10 to one side conduit portion 85 of the exhaust pipe 80, and another bypass pipe 92 connects the bypass hole 91 disposed on the other side panel 17 of the housing 10 to the other side conduit portion 85 of the exhaust pipe 80.

[0035] Preferably, the indoor air supply section 11 of the housing 10 includes an air supply housing 11a that collects and supplies outside air discharged from the two exhaust ports of the air supply dual fan assembly 40 to the indoor space. The air supply housing 11a includes: a quadrilateral rear panel with two air inlets communicating with the two exhaust ports of the air supply dual fan assembly 40; four side panels extending curvedly along the four sides of the rear panel; a plurality of edge plates extending curvedly along the four side panels; and a plurality of ventilation windows 11b spaced apart vertically on the side panels. Preferably, the air supply housing 11a is fixedly coupled to a vertical plate portion 83 forming an exhaust pipe 80, such that the two air inlets of the rear panel communicate with the two exhaust ports of the air supply dual fan assembly 40. In this case, preferably, the plurality of edge plates of the air supply housing 11a protrude to the exterior of the front panel of the housing 10.

[0036] The following describes the function and effect of the energy-saving vertical air circulator applicable to dual-shaft motors and dual fans of the present invention.

[0037] As an example, the energy-saving vertical air circulator of the present invention, which utilizes a dual-axis motor and dual fans, is installed in a school classroom. In this case, the rear surface of the housing 10 is located on the side of the classroom window. The first outdoor air supply port 13 and the second outdoor air supply port 14, located on the rear surface of the housing 10 of the vertical air conditioner, are respectively connected to the air supply connection pipe and protrude outwards from the classroom window, while the outdoor exhaust port 15 is connected to the exhaust connection pipe and protrudes outwards from the classroom window.

[0038] In this state, when the concentration of carbon dioxide in the classroom of the school building increases and it is necessary to ventilate the indoor air, the air supply dual fan assembly 40 and the exhaust fan assembly 50 are activated respectively. The operation of the air supply dual fan assembly 40 generates airflow. Outdoor air from outside the classroom flows in through the first outdoor air supply port 13 and the second outdoor air supply port 14 of the outer casing 10, and flows into the room through the first front side flow path F1 formed on one side of the exhaust pipe 80 (from the first outdoor air supply port 13 - first rear side air supply pipe 60 - first heat exchange device 20 - flow path), the first air supply fan 42 of the air supply dual fan assembly 40, and the indoor side air supply section 11 of the outer casing 10. Outdoor air flows into the room through the second side flow path F2 formed on the other side of the exhaust pipe 80 (from the second outdoor air supply port 14 - second rear side air supply pipe 70 - second heat exchange device 30 - flow path), the second air supply fan 43 of the air supply dual fan assembly 40, and the indoor side air supply section 11 of the outer casing 10.

[0039] Simultaneously, the operation of the exhaust fan assembly 5 generates exhaust flow, causing indoor air to flow into multiple indoor exhaust ports 12 located on both sides of the outer casing 10. This exhaust flow is then routed through one indoor exhaust port 12 – first heat exchange device 20 – flow path forming an exhaust pipe 80 – exhaust fan 52 of the exhaust fan assembly 50 – outdoor exhaust port 15, resulting in air being exhausted outdoors. Simultaneously, indoor air is also exhausted outdoors through the other indoor exhaust port 12 – second heat exchange device 30 – flow path forming an exhaust pipe 80 – exhaust fan 52 of the exhaust fan assembly 50 – outdoor exhaust port 15. As described above, indoor air is exhausted outdoors, and outdoor air is supplied indoors, thus ventilating the classroom. Furthermore, indoor and outdoor air exchange heat through the first heat exchange device 20 and the second heat exchange device 30, reducing heat loss in the classroom and ventilating the indoor air.

[0040] With the bypass unit 90, bypassing the first heat exchanger 20 and the second heat exchanger 30 allows for rapid exhaust to the outside. During bypass, with the bypass pipe 92 open via the opening / closing unit 93, the supply fan assembly 40 and the exhaust fan assembly 50 are activated. The operation of the exhaust fan assembly 50 generates exhaust flow, causing classroom air to flow into multiple bypass holes 91 located on both sides of the housing 10. This air then passes through one bypass hole 91 – a flow path forming an exhaust pipe 80 – the exhaust fan 52 of the exhaust fan assembly 50 – and finally to the outside exhaust port 15. Simultaneously, indoor air passes through the other bypass hole 91 – a flow path forming an exhaust pipe 80 – the exhaust fan 52 of the exhaust fan assembly 50 – and finally to the outside exhaust port 15. Since the exhaust flow bypasses the first heat exchanger 20 and the second heat exchanger 30, polluted air is rapidly exhausted to the outside. The supply air flow of the supply fan assembly 40 is as described above. On the other hand, when bypassing, only the exhaust fan assembly 50 is operated.

[0041] As described above, the present invention includes a housing 10, a first heat exchange device 20, a second heat exchange device 30, a dual-fan air supply assembly 40, an exhaust fan assembly 50, a first rear-side air supply pipe 60, a second rear-side air supply pipe 70, and a flow path forming exhaust pipe 80. Therefore, indoor air flows in through a plurality of indoor-side exhaust ports 12 respectively provided on both sides of the housing 10 and is discharged through an outdoor-side exhaust port 15 provided on the upper part of the rear surface of the housing 10. Outdoor air flows in through a first outdoor-side air supply port 13 and a second outdoor-side air supply port 14 provided on the rear surface of the housing 10 and flows into the room through an indoor-side air supply section 11 provided on the front of the housing 10, thereby effectively exchanging indoor air.

[0042] Furthermore, in this invention, the outdoor exhaust port 15 for indoor air to be discharged to the outside and the first outdoor air supply port 13 and the second outdoor air supply port 14 for outdoor air to flow into the room are respectively located on the upper part of the rear surface of the outer casing 10. Therefore, it is simple and convenient to install it in the interior of an existing building by setting it near the indoor window of the building and connecting the air supply pipe and the exhaust pipe through the window.

[0043] Furthermore, in this invention, a first rear air supply pipe 60 and a second rear air supply pipe 70 for outdoor air to flow into the room are provided on both sides of the exhaust pipe 80, which forms the flow path from indoor air to the outside. Therefore, the exhaust flow path structure for indoor air to the outside and the supply flow path structure for outdoor air to flow into the room become compact.

[0044] Furthermore, in this invention, when indoor air is rapidly polluted, the polluted indoor air can be quickly ventilated by the bypass movement of the bypass unit 90, thereby minimizing exposure to polluted indoor air.

Claims

1. An energy saving vertical air circulating machine with double-axle motor double-fan, characterized in that, The air conditioner comprises: a housing provided with an indoor air supply portion in an upper portion of a front surface, indoor air exhaust ports in lower portions of both side surfaces, and first and second outdoor air supply ports and an outdoor air exhaust port in an upper portion of a rear surface; first and second heat exchanger units respectively provided in lower portions of both sides of the housing to perform heat exchange between indoor air and outdoor air; a supply fan assembly provided in an upper portion of the housing to generate a supply air flow to supply outdoor air to the indoor air through the indoor air supply portion; an exhaust fan assembly provided below the supply fan assembly to generate an exhaust air flow to exhaust indoor air to the outdoor air through the outdoor air exhaust port; a first rear surface side supply duct provided in a rear surface of the housing to guide outdoor air supplied to the first outdoor air supply port to flow into the first heat exchanger unit; a second rear surface side supply duct provided in the rear surface of the housing to guide outdoor air supplied to the second outdoor air supply port to flow into the second heat exchanger unit; and a flow path forming exhaust duct provided in the housing to guide indoor air that has passed through the first and second heat exchanger units and the indoor air exhaust ports to flow into the exhaust fan assembly along first and second front surface side flow paths formed in both sides of the housing, the flow path forming exhaust duct comprising: a main duct portion provided between the first and second heat exchanger units in a vertical direction and communicating with the first and second heat exchanger units; a plurality of lower portion communication holes respectively formed in both side plates of an upper portion of the main duct portion; a plurality of vertical plate portions respectively extending in the vertical direction at upper ends of both side plates of the main duct portion and respectively mounting the supply fan assembly and the exhaust fan assembly; fan communication holes respectively formed in the vertical plate portions and communicating with suction ports of the exhaust fan assembly; and a duct portion communicating the lower portion communication holes with the fan communication holes.

2. The energy saving vertical air circulating machine using double shaft motor double fans according to claim 1, wherein: a bypass unit is further provided in the flow path forming exhaust duct to bypass indoor air to the exhaust fan assembly without passing through the first and second heat exchanger units, the bypass unit comprising: a plurality of bypass holes respectively provided in both side surfaces of the housing; a bypass duct communicating the bypass holes with the flow path forming exhaust duct; and an opening and closing unit for opening and closing the bypass duct. The first and second rear surface side supply ducts are respectively provided in the rear surface of the housing in the vertical direction.

3. The energy saving vertical air circulator with dual shaft motor dual fans suitable as claimed in claim 1, wherein, The first and second outdoor air supply ports provided in an upper portion of a rear surface of the housing are provided apart from each other in a horizontal direction, and the outdoor air exhaust port is provided between the first and second outdoor air supply ports.

4. The energy saving vertical air circulator with dual shaft motor dual fans suitable as claimed in claim 1, wherein, The first and second outdoor air supply ports provided in an upper portion of a rear surface of the housing are provided apart from each other in a horizontal direction, and the outdoor air exhaust port is provided between the first and second outdoor air supply ports.

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