JP2008082598A - Air conditioning device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an air conditioning device wherein rainwater hardly enters into an indoor unit because of the flow of air introduced into an air hole. <P>SOLUTION: The air conditioning device comprises an outdoor unit 2 in which an outdoor heat exchanger 17 and a compressor exist. In a body casing 40 of the outdoor unit 2, an air hole 45 is formed for introducing outside air into the outdoor unit 2 and a cover is mounted for covering the air hole 45 from the outside in the form of opening its lower side. Between the cover 100 and the body casing 40, a flow path is formed where air flows from the lower side opening of the cover 100 to the air hole 46. The cross section of the flow path is the same as or larger than the cross section of the air hole 46. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an air conditioner provided with an air hole for taking outside air into a casing of an outdoor unit.

The main body housing of the outdoor unit used in the air conditioner is provided with an air hole for sucking outside air into the indoor unit. The air hole may be provided with a cover that covers the air hole from the outside in such a manner that the lower side is opened. This cover takes outside air from the lower opening and passes it between the main body casing and the cover upward and leads it to the air hole, while rainwater etc. flowing down from the upper side of the outdoor unit, It functions so as not to enter the interior of the indoor unit through this air hole (see, for example, Patent Document 1).
JP 2004-321651 A

  However, when the air hole is covered with the cover described above, the flow of air that passes between the main body casing and the cover and is sucked into the air hole becomes faster, and this air flow causes rainwater to be introduced into the air hole. In some cases, this rainwater enters the indoor unit.

  This invention is made | formed in view of the situation mentioned above, and it aims at providing the air conditioning apparatus which can make rain water difficult to enter an indoor unit with the flow of the air guide | induced to an air hole.

In the present invention, the outdoor unit including the outdoor heat exchanger and the compressor is provided, and the main body housing of the outdoor unit is formed with an air hole for sucking outside air into the outdoor unit, while the lower side In the air conditioner to which a cover that covers the air hole from the outside is attached in a manner that opens the air, a flow path for air to flow from the lower opening of the cover to the air hole between the cover and the main body housing The cross-sectional area of this flow path is the same as or wider than the cross-sectional area of the air hole.
Further, in the present invention, an outdoor unit defined in a machine room in which a gas engine is disposed and a heat exchange chamber in which an outdoor heat exchanger is disposed is provided, and a main body housing of the outdoor unit includes the outdoor unit. In the air conditioner in which an air hole for sucking outside air into the machine room is formed, and a cover that covers the air hole is attached from the outside so as to open the lower side, the cover and the main body casing A flow path through which air flows from the lower opening of the cover to the air hole with the body, and the cross-sectional area of the flow path is equal to or larger than the cross-sectional area of the air hole. Features.
According to these structures, it can prevent that the flow of the air guide | induced to an air hole becomes quick.

In this case, the cover is arranged so that the air hole is covered with the upper part of the cover, while the cover is attached to the main body housing, and external air is discharged from the side of the cover. An inhalable opening can also be provided.
According to this configuration, the total area of the openings for taking in air increases, so that the speed of air flowing from these openings into the cover can be reduced. Moreover, the flow of the air led to the air hole can be slowed by combining the plurality of air flows.

Further, a plurality of the air holes may be arranged along the vertical direction, and the air holes located on the upper side may be covered with the cover.
According to this configuration, more air can be taken in, and rainwater can be prevented from entering from the air hole in the upper portion where rainwater is likely to be applied.

Furthermore, the external air can be configured to be sucked into the outdoor unit by the flow of air by intake of the gas engine.
According to this configuration, external air can be easily sucked into the outdoor unit.

  According to the present invention, the cross-sectional area of the flow path through which air flows from the lower opening of the cover to the air hole is equal to or larger than the cross-sectional area of the air hole, so that the cover and the main body housing The speed of the air flowing between the air holes can be the same as or slower than the speed of the air passing through the air holes. Thereby, rainwater can be made difficult to enter the outdoor unit by the air flow.

  Hereinafter, an air conditioner according to an embodiment of the present invention will be described with reference to the drawings. In the present embodiment, an engine-driven air conditioner that drives a compressor with a gas engine will be described as an example of an air conditioner.

  FIG. 1 is a refrigerant circuit diagram used in an engine-driven air conditioner according to an embodiment of the present invention. The engine-driven air conditioner 1 includes an outdoor unit 2 and an indoor unit 3, and the outdoor unit 2 and the indoor unit 3 are connected by an inter-unit pipe 4 (liquid pipe 4a and gas pipe 4b). .

The outdoor unit 2 includes a compressor 12 that compresses the refrigerant, an outdoor heat exchanger 17 that exchanges heat between the refrigerant compressed by the compressor 12 and the outside air, and the outdoor heat exchanger 17. And two outdoor blowers 18 for blowing air to 17.
The outdoor unit 2 includes an engine 10 for burning a fuel such as gas to generate a driving force and driving the compressor 12 with the driving force. The engine 10, the compressor 12, Are connected by a transmission device 14.

  The engine 10 is supplied with a mixture of air (described later in detail) taken in from the outside of the outdoor unit 2 and gas fuel. On the other hand, exhaust after combustion is performed via an exhaust heat exchanger, an exhaust muffler, and an exhaust top (not shown).

  The engine 10 is cooled by cooling water. The cooling water cooling water passage is provided with a cooling water pump 21 for circulating the cooling water and a radiator 19 for radiating the cooling water. The radiator 19 is provided with a radiator blower 20, and the radiator blower 20 blows air to the radiator 19 to promote heat dissipation of the cooling water. The outdoor unit 2 also houses a control device 22 that starts the engine 10.

  The indoor unit 3 includes an indoor heat exchanger 15 that exchanges heat between the refrigerant and indoor air, an indoor fan 16 that is attached to the indoor heat exchanger 15 and sends air to the indoor heat exchanger 15, and an indoor fan 16 An indoor control unit 31 for controlling the indoor unit 3 such as drive control is housed. Electric power is supplied to the indoor control unit 31 from a commercial power supply 32 (for example, AC 200 V), and the indoor blower 16 of the outdoor unit 2, the two outdoor blowers 18, and the radiator blower are passed through the indoor control unit 31. 20, the cooling water pump 21 and the control device 22 are also supplied with electric power.

  Moreover, the refrigerant | coolant piping extended from the discharge side and suction side of the compressor 12 of the outdoor unit 2 distribute | circulates the refrigerant | coolant discharged from the compressor 12 to the outdoor heat exchanger 17 side, or the indoor heat exchanger 15 A four-way valve 23 for reversing the circulation direction of whether to flow to the side is provided. An expansion valve 24 is provided in the refrigerant pipe that connects the outdoor heat exchanger 17 and the indoor heat exchanger 15.

FIG. 2 shows an outdoor unit of an engine-driven air conditioner according to an embodiment of the present invention, where (a) is a front view and (b) is a left side view of (a).
As shown in FIGS. 2A and 2B, the outdoor unit 2 has an outer body constituted by a main body housing 40 having a substantially rectangular parallelepiped shape. The inside of the outdoor unit 2 has an upper and lower two-stage structure with a partition plate 62 interposed therebetween, and the lower stage constitutes a machine room 60 and the upper stage constitutes a heat exchange chamber 61. In the machine room 60, the engine 10 (see FIG. 1) is arranged, and in the heat exchange room 61, an outdoor heat exchanger 17 (see FIG. 1) and the like are arranged. Further, two outdoor fans 18 are attached to the upper side surface of the heat exchange chamber 61 so as to release the air after heat exchange upward.

  As shown in FIG. 2A, the front side of the main body housing 40 is provided with an upper front panel 41 and two lower front panels 42a and 42b located below the upper front panel 41. Moreover, as shown in FIG.3 (b), the left side surface side of the main body housing | casing 40 is equipped with upper side panel 43a, 43b and lower side panel 44a, 44b.

  FIG. 3 is a perspective view of the lower side panel 44b located on the rear side shown in FIG. 4A is a single product view of the lower side panel 44b as viewed from the inside of the main body housing 40, and FIG. 4B is a right side view of FIG.

The lower side panel 44b located on the rear side of the side surface in FIG. 2 (b) is formed by bending a sheet metal into a substantially L shape as shown in FIGS. 3, 4 (a), and 4 (b). And includes a side surface portion 48a that forms the side surface of the main body housing 40 and a rear surface portion 48b that forms the rear surface of the main body housing 40.
As shown in FIG. 4A, the side surface 48 a has a plurality of air holes 45 (eight in FIG. 4A) for sucking air outside the main body housing 40 into the machine chamber 60. Is provided. The plurality of air holes 45 are each formed in a long hole shape having a longitudinal direction in the horizontal direction, and are arranged in a line at intervals in the vertical direction. Further, the lower side panel 44b is provided with an air hole 46 having an opening area larger than that of the air hole 45 in the upper part of the row of the air holes 45. This air hole 46 is also formed in the shape of a long hole having a longitudinal direction in the horizontal direction, similar to the air hole 45, and the dimension in the longitudinal direction is the same as the dimension in the width direction of the flow path portion 105 of the cover 100 described later. It is formed to be almost the same.
Further, as shown in FIG. 4 (b), air holes 49 (six in FIG. 4 (b)) whose longitudinal dimensions are shorter than the air holes 45 are spaced apart in the vertical direction on the rear surface portion 48b. A plurality are arranged side by side in a row.

Specifically, the air holes 45 and 49 are formed by extruding (squeezing out) the side surface portion of the lower side panel 44b from the inside to the outside, thereby preventing rainwater from being applied to the upper portions of the air holes 45 and 49. And openings 45b and 49b facing downward are formed in the lower portions of the air holes 45 and 49 (see FIG. 8 used in the description below).
Moreover, as shown to Fig.4 (a), the air hole 46 is a through-hole formed by the punching process, and does not have a roof part which prevents rainwater.

The air hole 46 is covered with a cover 100 as shown in FIG. FIG. 5A is a view of the cover 100 as viewed from the outside in a single item state, and FIG. 5B is a view of the cover 100 as viewed from the inside.
The cover 100 is integrally formed of a resin material, and as shown in FIGS. 5A and 5B, a lower opening 101 for taking in air from the lower side, and air from the side. Two lateral openings 102 for taking in, an induction part 103 for guiding air to the air hole 46, an attachment part 104 for attachment to the main body housing 40, and a flow path part 105 through which the taken-in air flows are provided. Yes.

  The mounting portion 104 is formed in an inverted U shape on the upper portion of the cover 100, and has a contact surface portion 104a for contacting the lower side panel 44b in an airtight state, and four mounting holes for mounting to the lower side panel 44b. 104b. The mounting holes 104b are aligned with the four screw holes 50 formed in the lower side panel 44b shown in FIG. 4, and are fastened by a fastening member 51 (see FIG. 6) such as a screw, thereby covering the cover 100. Is fixed to the lower side panel 44b.

  In addition, two lower corners of the cover 100 are formed with protrusions 106 that protrude toward the side surface 48a side of the lower side panel 44b and whose tip ends abut against the lower side panel 44b. A lower opening 101 is formed between the protrusions 106. In addition, a lateral opening 102 is formed between the protrusion 106 and the lower side of each inverted U-shape of the attachment portion 104.

  The guiding portion 103 is provided above the lower opening 101, and combines the air taken in from the lateral opening 102 and the air taken in from the lower opening 101, and supplies the air to the flow path portion 105. Is supposed to send.

  The flow path part 105 is an inverted U-shaped inner part of the attachment part 104, is formed on the upper side of the guide part 103, and has an inner side surface part 105a. As shown in FIG. 5B, the inner side surface portion 105a has a flat surface that is recessed from the contact surface portion 104a of the mounting portion 104 toward the outer side of the main body housing 40, and the cover 100 is attached to the lower side panel 44b. In this state, a gap is formed between the side surface portion 48a and the inner side surface portion 105a, and this gap becomes an airtight flow path through which air flows. Further, as shown in FIG. 3, the air hole 46 described above is covered with an inverted U-shaped inner portion of the mounting portion 104, that is, the flow path portion 105. Further, the inner side surface portion 105a is formed so as to form a surface substantially parallel to the side surface portion 48a in a state where the cover 100 is attached to the lower side surface panel 44b (see FIG. 6).

FIG. 6 shows a cross section of a portion cut along the line AA in FIG.
Ducts 110 and 120 for sending air taken from the air holes 45 and 46 to the engine 10 are provided on the back side of the lower side panel 44b (inside the main body housing 40).

The duct 110 is for guiding the air taken in along the back surface of the lower side panel 44b to the upper side, and is below the air hole 45 positioned at the lowermost side among the plurality of air holes 45 (not shown). To the upper side of the air hole 46 (see FIG. 6). The duct 110 is attached to the lower side panel 44b by a fastening member 112 such as a screw through a stud 111 provided on the duct 110 side.
The duct 120 has one end attached to the opening 113 of the duct 110 and the other end attached to the engine 10 side (not shown in FIG. 6), and guides air flowing from the opening 113 to the engine 10. It is like that.

  In FIG. 6, the air flow is indicated by arrows. This air flow is generated when air is taken in on the engine 10 side, and the air outside the main body housing 40 is sucked from the air holes 45 and 46 by this air flow.

  In the state where the cover 100 is attached to the lower side panel 44b as shown in FIG. 6, the vertical dimension L1 of the air hole 46, the surface of the side surface 48a of the lower side panel 44b, and the surface of the inner side surface 101a of the cover 100 Regarding the relationship with the distance (interval) L2, L1 and L2 have substantially the same dimensions. Further, as described above, the dimension in the longitudinal direction of the air hole 46 is the same as the dimension in the width direction of the flow path portion 105 of the cover 100. That is, the flow passage area A1 of the air flowing through the flow passage portion 105 of the cover 100 and the opening area A2 of the air hole 46 are configured to be substantially the same area.

Next, the operation of the engine-driven air conditioner according to the embodiment of the present invention will be described.
The air taken in from the outside of the main body housing 40 is sucked from the air hole 45 and is also sucked from the lower opening 101 and the side opening 102 of the cover 100 to form the side surface 48a of the lower side panel 44b. It passes between the inner side surface portion 101 a of the cover 100 and is sucked from the air hole 46. At this time, since the flow path area A1 of the flow path part 105 and the opening area A2 of the air hole 46 are substantially the same area, the flow rate of the air flowing through the flow path part 105 of the cover 100 and the opening of the air hole 46 are determined. The flow velocity of the flowing air is almost the same speed.

According to this, the force Df applied to the fluid flowing at a uniform flow velocity is
Df = (1/2) × Cf × ρ × V ² × A
(In the above equation, Df: air friction drag (air drag) (N), Cf: air friction drag coefficient (air drag coefficient) [(N · s ² ) / (kg · m)], ρ: density (kg / m ³ ), A: channel area (m ² ), V: velocity (m / s))
If the flow path area A and the velocity V in the flow path portion 105 and the air hole 46 are the same, the air drag Df is the same. That is, rainwater in the flow path portion 105 is not actively sucked into the air hole 46.

  According to the engine-driven air conditioner according to the embodiment of the present invention, a flow path is formed between the flow path portion 105 of the cover 100 and the lower side panel 44b of the main body housing 40, and the flow path is cut off. Since the area is almost the same as the cross-sectional area of the air hole 46, the speed of the air guided to the air hole 46 is almost the same, so that the air hole 46 positively collects rainwater in the vicinity of the cover 100. It can be prevented from inhaling. As a result, rain water can be made difficult to enter the outdoor unit 2 by the air flow. Moreover, since rainwater is not actively sucked in, the length (stroke) of the flow path can be shortened compared to the conventional case, and the overall shape of the cover 100 can be reduced.

  Further, the provision of the two lateral openings 102 increases the total area of the openings for taking in air. Therefore, the speed of the air flowing from these openings to the flow path portion 105 of the cover 100 can be reduced. Moreover, the flow of the air guided to the air hole 46 can be slowed by the flow of a plurality of airs joining at the guiding portion 103. As a result, rain water can be made difficult to enter the outdoor unit 2 by the air flow.

  Further, by arranging a plurality of air holes 45, 46 in the vertical direction and covering the air hole 46 located on the upper side with the cover 100, more air can be taken in and rainwater can be applied. It is possible to prevent rainwater from entering through the air holes 46 in the upper part, which is easy. As a result, rainwater can be prevented from entering the outdoor unit 2.

The best mode for carrying out the present invention has been described above. However, the present invention is not limited to the above-described embodiment, and various modifications and changes can be made based on the technical idea of the present invention. .
Although the engine-driven air conditioner has been described in the present embodiment, the present invention is applied to any air conditioner that uses an outdoor unit that operates by sucking air outside the main body housing 40. Can do.

  In addition, the air hole 46 has a long hole shape with the same size in the longitudinal direction of the air hole 46 as the width direction dimension of the flow path part 105 of the cover 100, but the air flowing through the flow path part 105 of the cover 100 The shape of the air hole 46 is not limited as long as the flow path area A1 and the opening area A2 of the air hole 46 are substantially the same area.

  Furthermore, by making the flow path area A1 wider than the opening area A2, the speed of the air passing through the flow path can be slowed so that rainwater is not actively sucked into the air holes 46.

On the other hand, only one of the lower opening 101 and the lateral opening 102 for sucking air formed in the cover 100 may be formed in the cover 100.
Further, the air outside the main body housing 40 is sucked into the outdoor unit 2 by the air flow caused by the intake air of the engine 10, but the air is sucked in by another method such as sucking with a fan. It doesn't matter if you do.

It is a schematic diagram which shows the refrigerant circuit of the engine drive type air conditioning apparatus which concerns on embodiment of this invention. BRIEF DESCRIPTION OF THE DRAWINGS It is an outdoor unit of the engine drive type air conditioning apparatus which concerns on embodiment of this invention, Comprising: (a) is a front view, (b) is a left view of (a). It is a perspective view of the lower surface panel shown in FIG. It is the lower surface panel shown in FIG. 2, Comprising: (a) is a back view, (b) is a right view of (a). 3A is a perspective view of the cover as viewed from the front side, and FIG. 3B is a perspective view of the cover as viewed from the back side. It is sectional drawing which shows the part cut | disconnected by the AA line of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Engine drive type air conditioner 2 Outdoor unit 10 Engine 12 Compressor 17 Outdoor heat exchanger 40 Main body housing 41 Upper front panel 42a Lower front panel 43a Upper side panel 44b Lower side panel 45, 46 Air hole 48a Side part 48b Rear Surface portion 100 Cover 101 Lower side opening portion 102 Lateral side opening portion 103 Guide portion 104 Mounting portion 105 Channel portion 105a Inner side surface portion 106 Projection 110, 120 Duct L1, L2 Dimensions

Claims (5)

An outdoor heat exchanger and an outdoor unit including a compressor are provided, and a main body housing of the outdoor unit is formed with an air hole for sucking outside air into the outdoor unit, while the lower side is opened. In the air conditioner to which a cover that covers the air hole is attached from the outside,
A flow path is formed between the cover and the main body housing so that air flows from the lower opening of the cover to the air hole. An air conditioner characterized by being wider than that. An outdoor unit defined in a machine room in which a gas engine is arranged and a heat exchange chamber in which an outdoor heat exchanger is arranged is provided, and a main body housing of the outdoor unit is connected to the machine room in the outdoor unit. In the air conditioner in which an air hole for sucking outside air is formed, and a cover that covers the air hole is attached from the outside in a mode of opening the lower side,
Between the cover and the main body housing, a flow path for air to flow from the lower opening of the cover to the air hole is formed, and whether the cross-sectional area of the flow path is the same as the cross-sectional area of the air hole An air conditioner characterized by being wider than that.   The cover is arranged so that the air hole is covered with an upper portion of the cover, and an opening capable of sucking outside air from the side of the cover in a state where the cover is attached to the main body housing. The air conditioner according to claim 1 or 2, further comprising:   The air conditioner according to any one of claims 1 to 3, wherein a plurality of the air holes are arranged along the vertical direction, and the air holes located on the upper side are covered with the cover. apparatus.   5. The air conditioner according to claim 2, wherein the external air is configured to be sucked into an outdoor unit by an air flow caused by intake of a gas engine.

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