WO2019131513A1

WO2019131513A1 - Air conditioning unit and air conditioning system

Info

Publication number: WO2019131513A1
Application number: PCT/JP2018/047254
Authority: WO
Inventors: 山本　昌由; 奥田　則之; 基彦福岡; 正史鎌田; 博渕上; 堅志辻
Original assignee: ダイキン工業株式会社
Priority date: 2017-12-25
Filing date: 2018-12-21
Publication date: 2019-07-04
Also published as: JP6789205B2; EP3734179A1; EP3734179A4; EP3734179B1; CN111512095A; ES2933523T3; CN111512095B; US20200363076A1; JP2019113257A

Abstract

An air conditioning unit (12A) which, in indoors, discharges temperature-regulated air toward the front face side is provided with a utilization-side fan (55), a casing (60), and a second air passage forming member (72). An air passage (FS1) in the second air passage forming member (72) has a circular cross-section. The casing (60) is square in a front view. The square is surrounded by a first side (S61) and a second side (S62), which are parallel to each other, and by a third side (S63) and a fourth side (S64), which are parallel to each other. In the air conditioning unit (12A), among a height (H), which is the distance between the first side (S61) and the second side (S62), and a width (W), which is the distance between the third side (S63) and the fourth side (S64), the height (H), which is the smaller, is 2.5 times or less the diameter (D) of the cross-section of the air passage (FS1).

Description

Air conditioning unit and air conditioning system

The present invention relates to an air conditioning unit that blows out temperature-controlled air to the front side indoors.

BACKGROUND ART Conventionally, there are air conditioning units having a square shape in a front view.

For example, the indoor unit disclosed in Patent Document 1 (Japanese Patent Laid-Open No. 201-146011) includes a square box-like casing, and blows out air after heat exchange toward the front. Further, a configuration in which four indoor units are arranged is also disclosed in Patent Document 1 (Japanese Patent Laid-Open No. 201-146011).

In an air conditioning unit disposed indoors, it may be required that the blowing air reaches far.

The air conditioning unit of the first aspect is an air conditioning unit that blows out temperature-controlled air to the front side indoors. The air conditioning unit includes a fan, a casing, and an air passage forming member. The casing accommodates the fan. The air passage forming member is disposed downstream of the air flow of the fan. The cross-sectional shape of the air passage of the air passage forming member is circular. In addition, the casing is square in front view. The quadrangle is a quadrilateral surrounded by first and second sides parallel to each other and third and fourth sides parallel to each other. In this air conditioning unit, the smaller one of the first distance, which is the distance between the first side and the second side, and the second distance, which is the distance between the third side and the fourth side, is the wind. It is 2.5 times or less of the diameter of the section of a passage.

As described above, in the air conditioning unit, the ratio of the smaller one of the first distance and the second distance to the diameter of the air passage cross section is smaller than that in the conventional case. Therefore, for example, when the first distance is smaller than the second distance, the first distance is suppressed to a short distance of 2.5 times or less the diameter of the cross section of the air passage. In this case, when the plurality of air conditioning units are arranged in the direction in which the third side and the fourth side extend, the distance between the air path of the adjacent first air conditioning unit and the air path of the second air conditioning unit becomes short. . Then, the air blown out from both of the air paths acts to reduce the resistance of the air flow to each other, and the air blown out from each of the air paths can reach far.

The air conditioning unit of the second aspect is the air conditioning unit of the first aspect, wherein the smaller one of the first distance and the second distance is 2.0 times or less the diameter of the air passage cross section. .

Here, for example, when the first distance is smaller than the second distance, the first distance is suppressed to a distance shorter than 2.0 times the diameter of the cross section of the air passage, which is considerably shorter than the conventional distance. For this reason, when the plurality of air conditioning units are arranged in the direction in which the third side and the fourth side extend, the air blown out from each air passage can reach very far.

The air conditioning unit of the third aspect is the air conditioning unit of the first aspect or the second aspect, and further includes a drain pan that receives dew condensation water generated in the casing. The drain pan is disposed at the lower part of the internal space of the casing. The first side and the second side of the casing extend in the horizontal direction. The third side and the fourth side of the casing extend in the vertical direction. The first distance which is the height dimension of the casing is smaller than the second distance which is the width dimension of the casing.

Here, in the air conditioning unit in which the height dimension (first distance) of the casing is smaller than the width dimension (second distance), the drain pan is disposed below the internal space of the casing. Conventionally, in an air conditioning unit equipped with such a drain pan, no design was made to limit the height dimension (first distance) of the casing to a short distance of 2.5 times or less of the diameter of the air passage cross section. That is, a design in which the diameter of the cross section of the air passage is 40% or more of the height dimension (first distance) with respect to the height dimension of the casing is not simple considering the arrangement of the drain pan etc. It has not been. However, in the air conditioning unit according to the third aspect, the height dimension (first distance) of the casing is kept small relative to the diameter of the cross section of the air passage. An effect is obtained.

The air conditioning system of the fourth aspect is an air conditioning system in which the first air conditioning unit and the second air conditioning unit are arranged in the first direction. The first air conditioning unit is any one of the first to third aspects of the air conditioning unit. The second air conditioning unit is also an air conditioning unit according to any one of the first to third aspects. The center of the first air passage, which is the air passage of the first air conditioning unit, and the center of the second air passage, which is the air passage of the second air conditioning unit, are separated by a third distance in the first direction. The third distance is equal to or less than 2.5 times the diameter of the cross section of the air passage.

Here, since the air conditioning unit according to any one of the first to third aspects is adopted as the first air conditioning unit and the second air conditioning unit, the third distance is 2.5 times the diameter of the cross section of the air passage It can be suppressed to the following. And, the third distance which is the distance between the center of the first air path and the center of the second air path is 2.5 times or less of the diameter of the cross section of the air path and is relatively short. The air blown out plays a role in reducing the resistance of the air flow to each other. Thus, in the air conditioning system according to the fourth aspect, both the air blown out from the first air passage and the air blown out from the second air passage reach far beyond the conventional one.

The air conditioning system of the fifth aspect is the air conditioning system of the fourth aspect, further comprising a support member. The support member is disposed between the first air conditioning unit and the second air conditioning unit. The support member supports the first air conditioning unit and / or the second air conditioning unit. The dimension along the first direction of the support member is equal to or less than half the diameter of the cross section of the air passage.

Here, a support member is used as a member for supporting the first air conditioning unit and / or the second air conditioning unit. And since the dimension along the 1st direction of the support member is made small, the center of a 1st air course and the center of a 2nd air course can be closely approached. As a result, the third distance is shortened, and the air blown out from the first air passage and the second air passage can easily reach far.

The figure which shows the refrigerant | coolant piping system of an air conditioning system. The figure which looked at a part of internal structure of the user side air conditioning unit from diagonally back. Front view of an air conditioning unit. The side view of an air conditioning unit. The figure which shows the state which put in order and installed two air conditioning units in the perpendicular direction. The figure which shows a unit space | interval when two air conditioning units are put in order and installed in a perpendicular direction. The figure which shows the result of fluid analysis when making use side fans rotate. The figure which shows the flow state (wind speed distribution, turbulent energy) in a blowing surface among the results of the fluid analysis of FIG. FIG. 9 is a diagram showing another analysis result in which the flow state of FIG. 8 is input to the blowout boundary surface. The figure of an analysis result which shows the furthest distance (the reach distance of wind speed 1 m / s or more) in which blowing air flows at predetermined wind speed at the time of operating two air conditioning units separated greatly. The figure of an analysis result which shows the furthest distance (the reach distance of wind speed 1 m / s or more) where blowing air flows at predetermined wind speed at the time of making two air conditioning units arranged near operate. The figure of an analysis result which shows the furthest distance (the reach distance of wind speed 1 m / s or more) in which blowing air flows at predetermined wind speed at the time of making two adjacent air conditioning units operated operate. The graph which shows the relationship between the reach distance of wind speed 1 m / s or more, the distance between air paths, and the diameter of an air path. The figure of an analysis result which shows the furthest distance (the reach | attainment distance of the wind speed 1 m / s or more) in which blowing air flows by predetermined wind speed when arrange | positioning 4 units | sets of air-conditioning units based on a modification adjacently.

(1) Overall Configuration of Air Conditioning System FIG. 1 is a diagram showing a refrigerant piping system of the air conditioning system 10. As shown in FIG. The air conditioning system 10 is a refrigerant piping type distributed air conditioner, and cools and heats the interior of the building by performing a vapor compression refrigeration cycle operation.

The air conditioning system 10 is installed in a factory mainly to partially cool or warm a space in an open building such as a factory. The air conditioning system 10 includes a heat source unit 11 installed outside the factory, a large number of

air conditioning units

12A, 12B, ... installed in the factory, the heat source unit 11 and the

air conditioning units

12A, 12B, ... And a liquid refrigerant communication pipe 13 and a gas refrigerant communication pipe 14 for connecting them. That is, the refrigerant circuit of the air conditioning system 10 shown in FIG. 1 is configured by connecting the heat source unit 11, the

air conditioning units

12A, 12B, ... on the use side, and the

refrigerant communication pipes

13 and 14. .

Inside the factory, the

air conditioning units

12A, 12B,... May be placed on the floor surface, may be hung from a ceiling beam, or may be supported by columns. Each of the

air conditioning units

12A, 12B,... Is connected to a remote controller (not shown), and can change the set temperature and the air volume in several steps. Further, the

air conditioning units

12A, 12B,... Can be individually turned on / off.

Refrigerant is enclosed in the refrigerant circuit shown in FIG. 1, and as described later, the refrigeration cycle operation is such that the refrigerant is compressed, cooled, condensed, decompressed, heated and evaporated, and then compressed again. To be done.

(2) Configuration of each part of air conditioning system (2-1) Heat source unit The heat source unit 11 mainly includes the compressor 20, the four-way switching valve 15, the heat source side heat exchanger 30, and the heat source side expansion valve 41 A liquid side shutoff valve 17 and a gas side shutoff valve 18 are provided.

The compressor 20 is a hermetic compressor driven by a motor for the compressor. The compressor 20 sucks the gas refrigerant from the suction passage 27.

The four-way switching valve 15 is a mechanism for switching the flow direction of the refrigerant. During the cooling operation, the four-way switching valve 15 connects the refrigerant pipe 29 on the discharge side of the compressor 20 to one end of the heat source side heat exchanger 30, and also the suction flow path 27 on the suction side of the compressor 20 and the gas side. It connects with the closing valve 18 (see the solid line of the four-way switching valve 15 in FIG. 1). Thereby, the heat source side heat exchanger 30 functions as a condenser of the refrigerant compressed by the compressor 20, and the utilization side heat exchanger 50 described later evaporates the refrigerant condensed in the heat source side heat exchanger 30. Function as a container. Further, during the heating operation, the four-way switching valve 15 connects the refrigerant pipe 29 on the discharge side of the compressor 20 and the gas side closing valve 18, and at the same time, the suction flow path 27 and one end of the heat source side heat exchanger 30 It connects (refer the broken line of the four-way switching valve 15 of FIG. 1). Thereby, the use side heat exchanger 50 functions as a condenser of the refrigerant compressed by the compressor 20, and the heat source side heat exchanger 30 is an evaporator of the refrigerant cooled in the use side heat exchanger 50. Act as.

The heat source side heat exchanger 30 is a heat exchanger that functions as a condenser or an evaporator of the refrigerant. One end of the heat source side heat exchanger 30 is connected to the four-way switching valve 15, and the other end is connected to the heat source side expansion valve 41.

The heat source unit 11 has a heat source side fan 35 for taking outside air into the unit and discharging it outside again.

The heat source side expansion valve 41 is an expansion mechanism for reducing the pressure of the refrigerant, and is an electronic expansion valve whose opening degree can be adjusted. One end of the heat source side expansion valve 41 is connected to the heat source side heat exchanger 30, and the other end is connected to the liquid side closing valve 17.

The liquid side shutoff valve 17 is a valve to which the liquid refrigerant communication pipe 13 is connected. The gas side shut-off valve 18 is a valve to which the gas refrigerant communication pipe 14 is connected, and is also connected to the four-way switching valve 15.

(2-2) Use-side air conditioning unit The

air conditioning units

12A, 12B,... Are connected to the heat source unit 11 via the

refrigerant communication pipes

13 and 14, respectively. The

air conditioning units

12A, 12B, ... have completely the same outer shape and internal structure, respectively. Here, the air conditioning unit 12A will be described as an example with reference to FIGS. 1 to 4.

The air conditioning unit 12A includes a liquid refrigerant pipe 51, a use side expansion valve 42 which is a pressure reducer, a use side heat exchanger 50, a gas refrigerant pipe 52, a use side fan 55, and the like.

The use side expansion valve 42 is an expansion mechanism for reducing the pressure of the refrigerant, and is an electronic expansion valve whose opening degree can be adjusted. One end of the use side expansion valve 42 is connected to the liquid refrigerant communication pipe 13 via the liquid refrigerant pipe 51, and the other end is connected to the use side heat exchanger 50.

The use side heat exchanger 50 is a heat exchanger that functions as a refrigerant evaporator or condenser. One end of the use side heat exchanger 50 is connected to the use side expansion valve 42, and the other end is connected to the gas refrigerant communication pipe 14 via the gas refrigerant pipe 52.

The air conditioning unit 12A is provided with the use side fan 55 for drawing indoor air into the unit and supplying it indoors again, and heat is generated between the indoor air and the refrigerant flowing through the use side heat exchanger 50. Make the exchange.

(2-3) Refrigerant communication pipes The

refrigerant communication pipes

13, 14 are refrigerant pipes to be constructed on site when the heat source unit 11 and the

air conditioning units

12A, 12B, ... are installed at installation locations inside and outside the factory. It is. When installing the above-mentioned

air conditioning units

12A, 12B, ... on the use side, install them directly on the floor or base of the factory, or hang them from a ceiling beam and connect an extension duct to the outlet, Place multiple units side by side up and down. With the installation of the

air conditioning units

12A, 12B, ..., the

refrigerant communication pipes

13, 14 are also disposed along the floor, the ceiling, and the pillars.

If a manual valve is provided between the

refrigerant communication pipes

13 and 14 and the

air conditioning units

12A, 12B, ..., it will be easy to add an air conditioning unit or move an air conditioning unit in the future.

In the air conditioning system 10, several tens of

air conditioning units

12A, 12B, ... can be connected to the heat source unit 11, and the maximum length of the

refrigerant communication pipes

13, 14 is 150 m.

(3) Operation of Air Conditioning System Next, the operation of the air conditioning system 10 will be described.

(3-1) Operation of cooling operation During cooling operation, the four-way switching valve 15 is in the state shown by the solid line in FIG. 1, that is, the discharge gas refrigerant from the compressor 20 flows to the heat source side heat exchanger 30, The suction passage 27 is connected to the gas side shut-off valve 18. The heat source side expansion valve 41 is fully opened, and the opening degree of the use side expansion valve 42 is adjusted. The closing

valves

17 and 18 are open.

In the state of the refrigerant circuit, the high-pressure gas refrigerant discharged from the compressor 20 is sent to the heat source side heat exchanger 30 functioning as a refrigerant condenser via the four-way switching valve 15, and the heat source side fan It is cooled by heat exchange with the external air supplied by 35. The high pressure refrigerant cooled and liquefied in the heat source side heat exchanger 30 is sent to the

air conditioning units

12A, 12B,... Via the liquid refrigerant communication pipe 13. The refrigerant sent to each

air conditioning unit

12A, 12B, ... is reduced in pressure by the use side expansion valve 42 and becomes a low pressure gas-liquid two-phase refrigerant, and the user side heat exchanger functions as an evaporator of the refrigerant Heat is exchanged with indoor air at 50 and evaporated to form a low pressure gas refrigerant. Then, the low-pressure gas refrigerant heated in the use-side heat exchanger 50 is sent to the heat source unit 11 via the gas refrigerant communication pipe 14, and is again sucked into the compressor 20 via the four-way switching valve 15. Ru. In this way, cooling in the factory (indoor) is performed.

When only a part of the air conditioning units of the

air conditioning units

12A, 12B,... Are operating, the use-side expansion valve 42 of the air conditioning unit which is stopped is set to the stop opening degree. In this case, the refrigerant hardly passes through the inside of the air conditioning unit under operation stop, and the cooling operation is performed only for the air conditioning unit under operation.

(3-2) Operation of Heating Operation During heating operation, the four-way switching valve 15 is in the state shown by the broken line in FIG. 1, that is, the refrigerant pipe 29 on the discharge side of the compressor 20 is connected to the gas side closing valve 18 Also, the suction flow path 27 is connected to the heat source side heat exchanger 30. The heat source side expansion valve 41 and the use side expansion valve 42 are adjusted in opening degree. The closing

valves

17 and 18 are open.

In the state of the refrigerant circuit, the high-pressure gas refrigerant discharged from the compressor 20 is sent to the

air conditioning units

12A, 12B, ... via the four-way switching valve 15 and the gas refrigerant communication pipe 14. The high-pressure gas refrigerant sent to each of the

air conditioning units

12A, 12B,... Is cooled by heat exchange with indoor air in the use-side heat exchanger 50 that functions as a refrigerant condenser. Thereafter, it passes through the use side expansion valve 42 and is sent to the heat source unit 11 via the liquid refrigerant communication pipe 13. Indoor air is heated when the refrigerant exchanges heat with the indoor air to be cooled. The high-pressure refrigerant sent to the heat source unit 11 is decompressed by the heat source side expansion valve 41 and becomes a low pressure gas-liquid two-phase refrigerant, and flows into the heat source side heat exchanger 30 functioning as a refrigerant evaporator. . The low-pressure gas-liquid two-phase refrigerant flowing into the heat source side heat exchanger 30 exchanges heat with the external air supplied by the heat source side fan 35, is heated, and evaporates to become a low pressure refrigerant. The low-pressure gas refrigerant leaving the heat source side heat exchanger 30 is again drawn into the compressor 20 via the four-way switching valve 15. In this way, heating in the factory (indoor) is performed.

(4) Details of the structure of the air conditioning unit on the use side Next, the details of the

air conditioning units

12A, 12B, ... on the use side will be described. As described above, since the air conditioning units have the same outer shape and the same internal structure, the air conditioning unit 12A will be described as an example.

The air conditioning unit 12A is a unit that blows out the temperature-controlled air to the front side indoors. The air conditioning unit 12A includes the first and second air passage forming members in addition to the liquid refrigerant pipe 51, the use side expansion valve 42 which is a pressure reducer, the use side heat exchanger 50, the gas refrigerant pipe 52 and the use fan 55. 71, 72, drain pan 59, casing 60 etc. are provided. FIG. 2 is a view of a part of the internal structure of the air conditioning unit 12A viewed obliquely from behind. In FIG. 2, many of the electric component box, the use side expansion valve 42, the liquid refrigerant pipe 51, and the gas refrigerant pipe 52 are not shown in order to make the other internal structures easy to see. Further, in FIG. 2, for example, a portion of the first air passage forming member 71 covering the periphery of the fan blade 55 b is not shown, for example, to facilitate understanding, and the front of the first air passage forming member 71 is shown. Only part of the side is shown.

(4-1) Use-Side Heat Exchanger and Use-Side Fan As shown in FIG. 2, the use-side heat exchanger 50 is disposed on the back side in the casing 60. The right side of FIG. 2 is the front side, and the left side is the back side. The user side fan 55 is located in front of the user side heat exchanger 50. The use side fan 55 has a motor 55a whose rotation axis extends in the front and back direction, and a fan blade 55b located in front of the motor 55a. When the fan blade 55 b rotates, air is drawn in from the opening at the back of the casing 60, and the air flows from the back side to the front side of the use side heat exchanger 50. The air having passed through the use side heat exchanger 50 passes through the outlet 66 located on the front side of the use side fan 55 and is blown out to the front side of the casing 60.

(4-2) First and Second Airway Forming Members The first and second

airway forming members

71 and 72 are both cylindrical members. The first air passage forming member 71 is located in the casing 60 and covers the periphery of the fan blade 55b. As shown in FIGS. 3 and 4, the second air passage forming member 72 is located outside the casing 60 and guides the air blown out from the outlet 66 forward. The second air passage forming member 72 is disposed downstream of the air flow of the use side fan 55. The first air passage forming member 71 and the second air passage forming member 72 have the same inner diameter ID. The first and second air

passage forming members

71 and 72 form a cylindrical air passage FS1 on the front side of the fan blade 55b. The diameter D of the air passage FS1 is equal to the inner diameter ID of the first and second air passage forming members 71 and 72 (see FIG. 3).

The diameter of the cross section of the second air passage forming member 72 located downstream of the fan blade 55b in the air flow direction is constant here. However, a structure may be adopted in which the diameter of the cross section of the second air passage forming member 72 decreases as it approaches the tip. However, in this case, the diameter of the cross section of the tip end portion of the air passage FS1 is small, and it is difficult to satisfy the condition of the ratio to the height dimension H of the casing 60 described later.

(4-3) Drain Pan The drain pan 59 is disposed at a lower portion in the casing 60, as shown in FIG. The drain pan 59 is located below the use-side heat exchanger 50, the liquid refrigerant pipe 51, the gas refrigerant pipe 52, the use-side fan 55, the first air path forming member 71, etc., and receives condensed water generated in the casing 60. Even when condensation occurs on the surface of the use side heat exchanger 50 and the liquid refrigerant pipe 51 during the cooling operation, the condensed water can be received by the drain pan 59.

(4-4) Casing The square box-like casing 60 mainly includes a top plate 61, a bottom plate 62, a left side plate 63, a right side plate 64, and a front plate 65. There is no steel plate on the back of the casing 60, and the back of the use side heat exchanger 50 is exposed. A circular air outlet 66 is formed at the center of the front plate 65. The blower outlet 66 is provided with a plurality of flow straighteners. Further, the diameter of the outlet 66 and the inner diameter ID of the first and second air

passage forming members

71 and 72 described above are equal.

As shown in FIG. 3, the casing 60 is square in front view. A first side S61 which is an upper side of the rectangular casing 60 and a second side S62 which is a lower side extend in the horizontal direction. The third side S63 which is the left side of the rectangular casing 60 and the fourth side S64 which is the right side extend in the vertical direction (vertical direction). The first side S61 and the second side S62 are parallel to each other. The third side S63 and the fourth side S64 are parallel to each other. The height dimension H, which is the distance (first distance) between the first side S61 and the second side S62, and the width dimension W, which is the distance (second distance) between the third side S63 and the fourth side S64, are compared Then, in the air conditioning unit 12A, the height dimension H is smaller than the width dimension W. Specifically, the height dimension H is 455 mm, and the width dimension W is 555 mm.

Then, the smaller one of the height dimension H and the width dimension W of the quadrangle in the front view of the casing 60, that is, the height dimension H is suppressed to 2.5 times or less the diameter D of the air passage FS1 described above. ing. By designing the casing 60 in this manner, as described later, an effect on the reach of the blown air when the two

air conditioning units

12A and 12B are arranged can be obtained.

As described later, the smaller one of the height dimension H and the width dimension W of the casing 60 may be smaller than twice the diameter of the air passage FS1 by devising the arrangement of parts in the casing 60. More desirable. In the air conditioning unit 12A according to the present embodiment, the diameter D of the air passage FS1, that is, the inner diameter ID of the first and second air

passage forming members

71 and 72 is 320 mm. Therefore, the height dimension H (455 mm) of the casing 60 is within 1.5 times the diameter (320 mm) of the air passage FS1.

As described above, in the air conditioning unit 12A according to the present embodiment, the ratio of the height dimension H of the casing 60 to the diameter D of the air passage FS1 is a very small value at an unprecedented level.

(5) Reaching Distance of Blown Airflow When Arranging Multiple Air-Conditioning Units Adjacent to Each Other FIGS. 5 and 6 show a state where two air-

conditioning units

12A and 12B are arranged in the vertical direction D1. As described above, the air conditioning unit 12A and the air conditioning unit 12B have exactly the same structure. The air conditioning unit 12A is disposed immediately above the air conditioning unit 12B, and a gap with a height of 85 mm is provided between the air conditioning unit 12A and the air conditioning unit 12B. The support member 81 is disposed in the gap. The support members 81 respectively support the first air conditioning unit 12A or the second air conditioning unit 12B. One end of the support member 81 is fixed to the column 80. The height dimension L1 of the support member 81 is 80 mm. Between the height dimension L1 (80 mm) of the support member 81 and the diameter (320 mm) of the air passage FS1 of each

air conditioning unit

12A, 12B,
Height dimension L1 of support member 81 <(diameter of air passage FS1) x 0.5
The support member 81 is selected so that the following relationship holds. Here, since there is an allowance for strength, the number of support members 81 is two for each

air conditioning unit

12A, 12B, and the height dimension L1 of the support members 81 is 80 mm.

As shown in FIG. 6, when the two

air conditioning units

12A and 12B are vertically arranged and the height of the gap between them is set to 85 mm, the first air path FS1 which is the air path of the first air conditioning unit 12A. And the center C2 of the second air passage FS2, which is the air passage of the second air conditioning unit 12B, are separated by the third distance L3 in the vertical direction D1. The third distance L3 is equal to or less than 2.5 times the diameter (320 mm) of the cross section of the air passages FS1 and FS2. Here, the third distance L3 = 540 mm, which is about 1.7 times the diameter (320 mm) of the cross section of each air passage FS1, FS2.

By reducing the ratio of the third distance L3 to the diameter D of the cross section of each of the air passages FS1 and FS2, an effect on the reaching distance of the blowoff air described later can be obtained.

(6) Reaching Distance of Blown Air When Two Air-Conditioning Units Are Lined Up Next, referring to FIGS. 7 to 13, when the two air-

conditioning units

12A and 12B are vertically arranged, The reach distance will be described. Here, the results of air flow analysis and measurement results using a real machine are compared and verified, and using the model of air flow analysis obtained by that, knowledge about the reaching distance of the blown air is obtained. The following describes the findings.

(6-1) Adjustment of Airflow Analysis Parameters Based on Wind Speed Measurement Results First, two

air conditioning units

12A and 12B are vertically stacked, that is, two

air conditioning units

12A and 12B are disposed without a gap, and the wind speed measurement device The wind speed was measured at 1120 points using. The rotation speed of the fan is 1646 times / minute, and the air volume is about 18 cubic meters / minute. The same wind speed was measured with only one air conditioning unit 12A.

Next, the same fan rotational speed and air volume are input, air flow analysis is carried out with respect to a single air conditioning unit 12A (see FIG. 7), and time-averaged flow conditions (wind speed distribution, turbulent energy) of one fan rotation on the blowing surface ) Was obtained (see FIG. 8). The flow state obtained there was input to the blowout boundary surface, and another air flow analysis was performed (see FIG. 9). This air flow analysis was also performed for each case where two units were stacked vertically, as in the case of the experiment using a wind speed measuring device.

Then, the wind speed at each point obtained from the air flow analysis was compared with the measurement result of the experiment performed using the wind speed measuring device, and the parameter adjustment of the air flow analysis was performed.

(6-2) Relationship between Relative Distance between Two Air Conditioning Units and Reached Distance of Blown Air Next, the air flow analysis was repeated by changing the gap size of the two

air conditioning units

12A and 12B arranged vertically. One example is shown in FIG. 10 to FIG.

FIG. 10 shows an analysis result in the case where two

air conditioning units

12A and 12B separated by a gap size of 2 m are operated. When the gap dimension is 2 m, the third distance L3 which is the distance between the center C1 of the first air passage FS1 and the center C2 of the second air passage FS2 is 2455 mm, which is the diameter of the air passages FS1 and FS2 ( The value divided by 320 mm) is 7.7. Here, as in the case where one unit is operated alone, the area with a wind velocity of 1 m / s or more remains at a point 4 m away from each of the

air conditioning units

12A and 12B. That is, the wind having a wind speed of 1 m / s reaches 4 m away from each of the

air conditioning units

12A and 12B, but the wind speed is less than 1 m / s in an area further away. Here, this 4 m is called the reach of the wind speed of 1 m / s of the blown air.

FIG. 11 shows an analysis result in the case where two

air conditioning units

12A and 12B disposed close to each other are operated with a gap size of 500 mm. When the gap dimension is 500 mm, the third distance L3 which is the distance between the center C1 of the first air passage FS1 and the center C2 of the second air passage FS2 is 955 mm, which is the diameter of the air passages FS1 and FS2 ( The value divided by 320 mm is 3.0. Here, the reach of the wind speed of 1 m / s of the blown air extends to 6.7 m.

FIG. 12 shows an analysis result in the case where the two

air conditioning units

12A and 12B disposed adjacent to each other are operated with a gap size of 0 mm. When the gap dimension is 0 mm, the third distance L3 which is the distance between the center C1 of the first air passage FS1 and the center C2 of the second air passage FS2 is 455 mm, which is the air passage diameter (320 mm) The divided value is 1.4. Here, the reach of the wind speed of 1 m / s of the blown air extends to 7.3 m.

In addition to the conditions shown in FIGS. 10 to 12, as a result of repeating the air flow analysis while changing parameters such as the gap size, the graph shown in FIG. 13 was obtained for the reaching distance of the wind speed 1 m / s of the blown air. . As can be seen from FIG. 13, the two

air conditioning units

12A and 12B may be arranged without a large separation so that the value obtained by dividing the third distance L3 by the diameter D of the air paths FS1 and FS2 may be reduced. It results in extending the reach of wind speed 1 m / s of the blown air. Then, from FIG. 13, by setting the third distance L3 to be 2.5 times or less, preferably 2.0 times or less, of the diameter D of the air paths FS1 and FS2, the wind speed of the blown air is 1 m / s. It can be seen that the reach distance can be sufficiently extended.

In order to make the value (L3 / D) obtained by dividing the third distance L3 by the diameter D of the air passages FS1 and FS2 equal to or less than 2.5, when two

air conditioning units

12A and 12B are arranged vertically, a gap Even if you line up,
Height dimension H of casing 60 <(diameter of air passage FS1) × 2.5
It is necessary to satisfy the expression This is because the third distance = the height dimension H of the casing 60 is obtained if the

air conditioning units

12A and 12B are vertically arranged without any gap. Conversely,
Height dimension H of casing 60> (diameter of air passage FS1) × 2.5
In the case of the air conditioning unit, even if two units are stacked without gaps, the upper and lower air paths are separated by a large distance, and the reach of the wind speed of 1 m / s of the blown air is sufficient. Can not stretch.

(7) Features of air conditioning unit and air conditioning system (7-1)
In the air conditioning unit 12A, the ratio of the smaller one of the height dimension H and the width dimension W in the front view of the casing 60 (here, the height dimension H) to the diameter D of the cross section of the air passage FS1 is greater than that in the prior art. It is designed to be small. Specifically, the height dimension H is suppressed to a short dimension of 2.5 times or less of the diameter D of the cross section of the air passage FS1. Therefore, when the two

air conditioning units

12A and 12B are arranged in the vertical direction D1, the front view of the first air passage FS1 of the adjacent first air conditioning unit 12A and the second air passage FS2 of the second air conditioning unit 12B. The interval between the two becomes shorter (see FIG. 6). Then, the air blown out from both of the air paths FS1 and FS2 serves to reduce the resistance to the air flow to each other, and the air blown out from each of the air paths can reach far ( See Figure 12).

(7-2)
In the air conditioning unit 12A, as shown in FIG. 2, the thin drain pan 59 is disposed in the lower portion in the casing 60 while using the casing 60 in which the height dimension H is smaller than the width dimension W. Then, the inner diameters ID of the utilization side fan 55 and the first and second air

passage forming members

71 and 72 are designed as large as possible, and the diameter D of the cross section of the air passage FS1 with respect to the height dimension H of the casing 60 The arrangement of the utilization side heat exchanger 50 and the electrical component box is devised so that

Thereby, even in the air conditioning unit 12A including the drain pan 59, the effect of sufficiently extending the above-described reach of the wind speed of 1 m / s of the blown air is obtained.

(7-3)
In the air conditioning system 10, as shown in FIG. 6, two

air conditioning units

12A and 12B are arranged in the vertical direction D1 so that the gap is as small as possible. That is, a structure is adopted in which the two

air conditioning units

12A and 12B are not largely separated while securing the arrangement space of the support member 81. Specifically, two

air conditioning units

12A and 12B are vertically arranged with a gap of 85 mm in height.

For this reason, the third distance L3, which is the distance between the center C1 of the first air passage FS1 of the first air conditioning unit 12A and the center C2 of the second air passage FS2 of the second air conditioning unit 12B, is It is within 2.5 times the diameter D (320 mm) of the cross section of FS1 and FS2.

As shown in FIG.
Third distance (airway distance) L3 / airway diameter D = 1.7
Since the diameter D of the first air passage FS1 and the second air passage FS2 is increased and the gap between the two

air conditioning units

12A and 12B is decreased as the relationship of the relation is satisfied, the air conditioning system 10 is shown in FIG. As described above, it is possible to extend the above-mentioned reach of the wind speed of 1 m / s of the blown air to 7 m or more.

(8) Modification (8-1)
5 and 6 show an example in which two

air conditioning units

12A and 12B are arranged in the vertical direction D1, but in the air conditioning system 10, three or more

air conditioning units

12A, 12B,. You may For example, as shown in FIG. 14, if the four

air conditioning units

12A, 12B,... Are arranged up and down so as to be close to each other, the reach of the wind speed of 1 m / s of the blown air becomes longer.

(8-2)
In the above air conditioning system 10, the height dimension H of the air conditioning unit 12A is smaller than the width dimension W, and the

air conditioning units

12A, 12B,... Are arranged vertically, but may be reversed. That is, it is also possible to make the height dimension of the air conditioning unit larger than the width dimension and to arrange the plurality of air conditioning units in the lateral direction when arranging. Also in this case
Width dimension of casing <(diameter of air passage) x 2.5
The air blown out can be made to reach far by satisfying the above and reducing the distance between the air passages of the plurality of air conditioning units arranged side by side.

(8-3)
The embodiments of the air conditioning system and the air conditioning unit have been described above, but various changes in form and detail can be made without departing from the spirit and scope of the air conditioning system and the air conditioning unit described in the claims. It will be understood.

DESCRIPTION OF SYMBOLS 10 air-conditioning system 12A 1st air-conditioning unit 12B 2nd air-conditioning unit 55 user-side fan 59 drain pan 60 casing 72 air-path formation member 81 support member S61 1st side S62 2nd side S63 3rd side S64 4th side H casing Height dimension (first distance)
Width dimension of W casing (second distance)
D Cross section diameter of air passage FS1 First air passage FS2 Second air passage C1 Center of first air passage C2 Center of second air passage D1 Vertical direction (first direction)
L1 Height dimension of support member L3 Distance between the centers of both air paths of the first air conditioning unit and the second air conditioning unit arranged vertically (third distance)

Japanese Patent Application Publication No. 201-146011

Claims

An air conditioning unit (12A) for blowing out temperature-controlled air to the front side indoors, comprising:
With a fan (55),
A casing (60) for housing the fan;
An air passage forming member (72), which is disposed downstream of the air flow of the fan, and the air passage (FS1) has a circular sectional shape;
Equipped with
In a front view, the casing is a quadrangle surrounded by first side (S61) and second side (S62) parallel to each other and third side (S63) and fourth side (S64) parallel to each other. ,
The smaller of the first distance (H), which is the distance between the first side and the second side, and the second distance (W), which is the distance between the third side and the fourth side Is not more than 2.5 times the diameter (D) of the cross section of the air passage,
Air conditioning unit.
The smaller one of the first distance (H) and the second distance (W) is not more than 2.0 times the diameter (D) of the cross section of the air passage.
The air conditioning unit according to claim 1.
It further comprises a drain pan (59) for receiving condensation water generated in the casing,
The drain pan is disposed in the lower part of the internal space of the casing,
The first side and the second side extend horizontally,
The third side and the fourth side extend in the vertical direction,
The first distance (H) which is the height dimension of the casing is smaller than the second distance (W) which is the width dimension of the casing
The air conditioning unit according to claim 1 or 2.
A first air conditioning unit (12A), which is the air conditioning unit according to any one of claims 1 to 3.
A second air conditioning unit (12B), which is the air conditioning unit according to any one of claims 1 to 3.
An air conditioning system (10) comprising
The first air conditioning unit and the second air conditioning unit are arranged in a first direction (D1),
The center (C1) of the first air path (FS1) which is the air path of the first air conditioning unit and the center (C2) of the second air path (FS2) which is the air path of the second air conditioning unit Separated by a third distance (L3) in the first direction,
The third distance (L3) is equal to or less than 2.5 times the diameter (D) of the cross section of the air passage,
Air conditioning system.
A support member (81) disposed between the first air conditioning unit and the second air conditioning unit and supporting the first air conditioning unit and / or the second air conditioning unit;
And further
The dimension (L1) along the first direction (D1) of the support member is equal to or less than half the diameter (D) of the cross section of the air path (FS1, FS2).
The air conditioning system according to claim 4.