WO2011099629A1

WO2011099629A1 - Chilling unit

Info

Publication number: WO2011099629A1
Application number: PCT/JP2011/053166
Authority: WO
Inventors: 邦雄室井; 英樹丹野; 成浩岡田; 光輔小澤; 裕昭渡邉; 憲二郎松本; 孝光石黒
Original assignee: 東芝キヤリア株式会社
Priority date: 2010-02-15
Filing date: 2011-02-15
Publication date: 2011-08-18
Also published as: CN105004027B; CN105004027A; CN102753895A; JPWO2011099629A1; CN102753895B; KR101388844B1; JP5401563B2; KR20120116973A

Abstract

Disclosed is a chilling unit comprised of a housing (F) wherein a heat exchange unit (1) provided with an air heat exchanger (3) is mounted on the top of the housing, and a machine chamber (2) is formed on the inside of the housing; a plurality of independent refrigeration cycle units (1RA), (2RB) which are contained in the machine chamber (2), and are comprised of refrigeration cycle devices excluding the air heat exchanger (3); and a control box (8) provided with a water circulation pump (13) and electronic components for controlling. The water circulation pump (13), the first refrigeration cycle unit (1RA), the second refrigeration cycle unit (2RB), and the control box (8) are arranged in this order from the back side to the front side of the housing (F), so that the control box (8) which contains electronic components that receive various kinds of signals to control electric components, can be located at the most appropriate position. Thus, the maintenance operation for the control box (8) can be easily performed, and the operability can be improved.

Description

Chilling unit

The present invention relates to a chilling unit that constitutes, for example, an air conditioner, a heat pump water heater, or the like applied to a large-scale building or the like.

A so-called chilling unit, which is a heat exchange unit, is disclosed. The chilling unit (heat exchange unit) is housed in a heat exchange chamber, a machine room, an air heat exchanger disposed in the heat exchange room, a blower for blowing air to the air heat exchanger, and the machine room. Refrigeration cycle components that are used (for example, Japanese Patent Application Laid-Open No. 2007-163017).

The air heat exchangers are arranged to face each other in a substantially V shape when viewed from the front. The machine room is formed in a substantially inverted V shape when viewed from the front, and houses a compressor, a four-way valve, an expansion valve that expands the refrigerant, a water heat exchanger that exchanges heat between water and the refrigerant, and the like. The air heat exchanger communicates with the air heat exchanger via the refrigerant pipe.

In addition, the chilling unit requires a water circulation pump and water piping for guiding water to the water heat exchanger, and receives the control signals from the remote control (remote control panel) and the detection signals from various sensors to A control box that houses electronic components that send control signals to the components is also necessary, but there is no description about them.

By the way, when troubles occur in the electric parts such as the compressor, the blower, and the water circulation pump, maintenance of the control electronic parts and the control board accommodated in the control box is required. Therefore, the position setting of the control box in the chilling unit is extremely important for maintenance work.

In other words, this type of chilling unit is installed on a large-scale building, for example, on the rooftop or on a dedicated site separately provided. Here, a water supply / drainage facility, a power supply facility, and the like are also installed, and in the case of a rooftop, an elevator driving device and the like are also installed. However, there are many restrictions on the arrangement due to conditions such as the scale of each facility with respect to the design structure of the large-scale building itself.

For example, in the chilling unit having a simple one-row structure shown in FIG. 1 of the above-mentioned document, if there is a space along one side along the longitudinal direction, no setting is made for the control box position setting. There is no problem. However, there are many cases where there is a passage or a space in the direction perpendicular to the longitudinal direction at the end on the near side or the back side.

Furthermore, as shown in FIG. 5 of the above document, there are cases in which each side of a plurality of chilling units is provided side by side and arranged in a plurality of rows. In this configuration, even if there is a space along the outer surface side of the chilling units on both sides, there is no passage on both sides of the chilling unit in the middle row, and maintenance work for the control box becomes extremely inconvenient. End up.

The present invention has been made on the basis of the above circumstances, and the object of the present invention is to set a control box that accommodates electronic components for receiving various signals and controlling electric components at an optimal position, An object of the present invention is to provide a chilling unit capable of facilitating maintenance work for a control box and improving workability.

In order to satisfy the above object, the chilling unit of the present invention is housed in a housing in which a heat exchange section having an air heat exchanger is mounted on the upper portion and a machine room is formed therein, and in a machine room in the housing. A plurality of independent refrigeration cycle units composed of refrigeration cycle equipment excluding air heat exchangers, and a control box equipped with one water circulation pump and control electronic components, from the back side of the housing to the front side In order, the water circulation pump, the first refrigeration cycle unit, the second refrigeration cycle unit, and the control box were arranged.

FIG. 1 is a perspective view of a chilling unit according to an embodiment of the present invention. FIG. 2 is a side view of the chilling unit in a state where a side panel covering the machine room according to the embodiment is removed. FIG. 3 is a perspective view of the inside of the machine room according to the embodiment, and is a view for explaining a mounting structure from the first drain pan to the fourth drain pan. FIG. 4 is a perspective view of a single heat exchanger module according to the embodiment. FIG. 5 is an exploded perspective view of the heat exchanger module according to the embodiment. FIG. 6 is a perspective view of a first drain pan according to the embodiment. FIG. 7 is a perspective view around the water circulation pump and the water pipe according to the embodiment. FIG. 8 is a configuration diagram of the refrigeration cycle of the chilling unit according to the embodiment. FIG. 9 is a perspective view illustrating an air suction port provided in the lower frame of the housing according to the same embodiment. FIG. 10 is a diagram for explaining the state of the airflow relating to the air suction port according to the embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view of the assembled chilling unit Y, and FIG. 2 is a side view of the chilling unit Y in a state in which a side panel 2a of a machine room 2 described later is removed.

This chilling unit Y generates cold water or hot water, for example, cools the air with the obtained cold water to cool the room (indoor), or warms the air with the obtained hot water to heat the room (indoor). Eggplant. In addition to the air conditioner, it can be used as a heat pump hot water supply device.

Here, the chilling unit Y is formed in a rectangular shape from a longitudinal direction and a short direction parallel to each other in a plan view. And it is inconvenient for the operator to pass along the other direction by forming a passage T through which the worker can pass along one short direction.
In addition, when a plurality of chilling units Y are provided in parallel as shown in FIG. 9, an operator can pass along the longitudinal direction of the space formed between the chilling units Y. Further, a space space may be used instead of the passage T.

The short side end surface (right side surface in FIG. 2) is “front N”, the back side end surface (left side surface) is “back H”, and the end surface parallel to the longitudinal direction (front side front) is along the passage T in FIG. Determined as “Side E”. The substantially lower half of the chilling unit Y in the vertical direction includes a housing F. The heat exchange unit 1 is placed on the housing F, and the machine room 2 is formed inside the housing F.

The heat exchanging section 1 is composed of a plurality (here, four sets) of heat exchanger modules M and the same number of blowers S. In one set of heat exchanger modules M, a pair (two) of

air heat exchangers

3 and 3 are arranged to face each other, and a blower S is arranged between the upper ends of these

air heat exchangers

3 and 3. It becomes.

A top plate 4 is provided at the upper end of each heat exchanger module M, and the blower S is attached to a position of the top plate 4 facing the heat exchanger module M. If it demonstrates, the cylindrical blowing outlet 5 will protrude upwards from the top plate 4, and the fan guard 6 has covered the protrusion end surface of this blowing outlet 5. FIG.

The

air heat exchangers

3 and 3 constituting the heat exchanger module M face each other so that the top plate 4 side as the upper end portion is wide and the machine room 2 side as the lower end portion is close and close to each other. They are inclined to form a V shape.
The housing F on which the heat exchange unit 1 is mounted includes an upper frame Fa, a lower frame Fb, and a vertical frame Fc that connects the upper frame Fa and the lower frame Fb. The upper frame Fa is provided with a crosspiece Fd (see FIG. 3). In this case, three side plates 2a are attached to the side surface E along the longitudinal direction of the casing F, and end plates 2b are attached to the front surface N and the rear surface H along the short side direction. Is referred to as the machine room 2.

The upper frame Fa and the lower frame Fb are each assembled so as to form a horizontally long rectangular shape in plan view. Although the longitudinal dimensions of each other are the same, the short dimension is such that the front frame N and the rear surface H are both shorter in the upper frame Fa and longer in the lower frame Fb.
That is, the short direction dimension of the upper frame Fa is short according to the short direction dimension of the heat exchanger module M constituting the heat exchange unit 1. Therefore, the vertical frame Fc connecting the upper frame Fa and the lower frame Fb is provided so as to be inclined so that the dimension in the depth direction sequentially increases from the upper part to the lower part. ) It is formed in a substantially inverted V shape when viewed.

Thus, the heat exchanging part 1 mounted on the housing F is inclined so that the front view gradually decreases from the upper end to the lower side and is substantially V-shaped, and the housing F is directed from the upper end to the lower side. Therefore, the front view as the chilling unit Y is formed in a substantially drum shape with the central portion constricted.

In particular, as shown in FIG. 2, the machine room 2 formed in the housing F includes, in order from the rear surface H to the front surface N, a variable capacity water circulation pump 13, a first refrigeration cycle unit 1 RA, Second refrigeration cycle unit 2RB and control box 8 are arranged.

In other words, the control box 8 is disposed at the position closest to the front face N, the water circulation pump 13 is disposed at the position closest to the rear face H, and the second refrigeration is provided between the control box 8 and the water circulation pump 13. The cycle unit 2RB and the first refrigeration cycle unit 1RA are arranged.

In this way, the control box 8, the first and second refrigeration cycle units 1RA and 2RB, the water circulation pump 13, the refrigerant pipe and the water pipe are housed in the machine room 2, but all of these are accommodated. The components are housed inside the side plate 2a and the end plate 2b constituting the housing F. That is, there is no member exposed from the housing F in the completed chilling unit Y shown in FIG.

Furthermore, the components accommodated in the machine room 2 will be described.
FIG. 3 is a perspective view of the inside of the machine room 2 and is a view for explaining an attachment structure from the first drain pan 7a to the third drain pan 7c.

Four first drain pans 7a are placed on the upper frame Fa constituting the housing F. Although not particularly shown, a drain hose is connected to each first drain pan 7a to guide drain water to the second drain pan 7b.

The two second drain pans 7b are provided. The first refrigeration cycle unit 1RA is placed on one drain pan 7b, and the second refrigeration cycle unit 2RB is placed on the other drain pan 7b. Accordingly, the second drain pans 7b are arranged in series between the back H side end of the control box 8 and the back H side end of the lower frame Fb.

Second drain pan 7b is supported on the support member has a shown. The support member of the drain pan 7b is provided across the short direction of the lower frame Fb, and is provided at a predetermined interval in the longitudinal direction. The third drain pan 7c is supported on the lower frame Fb with a predetermined interval on the lower side of the second drain pan 7b.
The short side dimension of the third drain pan 7c is the same as the same direction dimension of the second drain pan 7b, and the long side dimension is the same as the full length dimension of the two second drain pans 7b arranged in series. .

During the heating operation to be described later, the air heat exchanger 3 exchanges heat with air, and condenses moisture contained in the air to form drain water. Initially, the drain water is in the form of water droplets and adheres to the surface, but gradually becomes enlarged and flows down to the respective first drain pans 7a.
The drain water is collected in the second drain pan 7b on the lower side through the drain hose. The drain water is also generated in the component parts of the first and second refrigeration cycle units 1RA and 2RB, and is received by the second drain pan 7b, and then collected in the third drain pan 7c and drained to the outside. It has become.

The water circulation pump 13 is disposed at the rear H side end of the machine room 2, and the first water heat exchanger 11 is disposed in the vicinity of the water circulation pump 13. And the 1st receiver 10a and the 2nd receiver 10b which are mentioned later along the near side longitudinal direction of the housing | casing F from the 1st water heat exchanger 11 are juxtaposed, and the 2nd water heat exchanger 12 is arrange | positioned. .

The third receiver 10c and the fourth receiver 10d are juxtaposed from the second water heat exchanger 12 along the longitudinal direction of the front side of the housing F, and in particular, the fourth receiver 10d is disposed close to the control box 8. Is done.

A first water pipe P1 (shown in FIGS. 2 and 7) is connected to the water circulation pump 13, and this is used as a return pipe from a place to be air-conditioned as an introduction pipe. A second water pipe P <b> 2 is connected across the water circulation pump 13 and the upper part of the first water heat exchanger 11.

Furthermore, a third water pipe P3 is connected across the lower portion of the first water heat exchanger 11 and the upper portion of the second water heat exchanger 12. A lower part of the second water heat exchanger 12 is connected to a fourth water pipe P4 extending in the direction of the water circulation pump 13 and having an end arranged in parallel with the first water pipe P1. The fourth water pipe P4 is extended as a lead-out pipe to a place to be air-conditioned.

On the back side of the first and

second receivers

10a and 10b and the first water heat exchanger 11, two variable capacity compressors, two four-way valves, two gas-liquid separators, etc. A refrigeration cycle apparatus 1K consisting of:
These are communicated via a refrigerant pipe, and two sets of air heat exchangers 3 each constituting a heat exchanger module M on the rearmost H side and a heat exchanger module M located on the front side. , 3 and two independent refrigeration cycles are connected via a refrigerant pipe to constitute the first refrigeration cycle unit 1RA.

On the back side of the third and

fourth receivers

10c, 10d and the second water heat exchanger 12, there are two variable capacity compressors, two four-way valves, two gas-liquid separators, etc. A refrigeration cycle device 2K comprising:
These are communicated via a refrigerant pipe, and two sets of air heat exchangers 3 respectively constituting a heat exchanger module M on the most front N side and a heat exchanger module M located on the far side. , 3 and 2 are connected via a refrigerant pipe so as to form two independent refrigeration cycles, and the second refrigeration cycle unit 2RB is configured.

In other words, the machine room 2 in the housing F includes the first refrigeration cycle unit 1RA and the second refrigeration unit which are independent from each other except for the air heat exchangers 3 constituting the four heat exchanger modules M. The cycle unit 2RB is accommodated, and the respective refrigeration cycle units 1RA and 2RB are placed on the second drain pan 7b.

The first water heat exchanger 11 and the second water heat exchanger 12 communicate with each other in series via the first water pipe to the fourth water pipes P1 to P4, and the refrigeration cycle units 1RA and 2RB are connected to each other. The two

refrigeration cycle devices

1K and 2K are connected in parallel to one

water heat exchanger

11 and 12, respectively.

4 is a perspective view of a single heat exchanger module M, and FIG. 5 is an exploded perspective view of the heat exchanger module M.
In the state where four heat exchanger modules M shown in each figure are arranged in series and the top plates 4 and the first drain pans 7a are in close contact with each other, the heat exchanging unit 1 shown in FIGS. Is configured. However, the air heat exchangers 3 constituting the adjacent heat exchanger module M are juxtaposed with each other with a slight gap therebetween.

The single heat exchanger module M is composed of a pair of

air heat exchangers

3 and 3 as described above. The single air heat exchanger 3 includes a flat plate portion 3a having a substantially rectangular shape when viewed from the side, and a bent piece portion 3b that is bent along the left and right side portions of the flat plate portion 3a.
A pair of the air heat exchangers 3 is prepared, the bent pieces 3b are opposed to each other, and are inclined so as to be substantially V-shaped when viewed from the front. Therefore, a substantially V-shaped space portion is formed between the opposed

bent piece portions

3b and 3b of the opposed

air heat exchangers

3 and 3, and this space portion is cut into a substantially V-shape. It is closed by a shielding plate 15 which is a plate.

The shielding plate 15 is provided on both right and left sides of the heat exchanger module M. Therefore, as shown in FIGS. 1 and 2, when the four heat exchanger modules M are arranged in parallel, the shielding plates 15 are provided close to each other in the adjacent heat exchanger modules M.

The air heat exchanger 3 is arranged in a state in which substantially strip-shaped fins that are short in the horizontal direction and extremely long in the vertical direction are erected, are arranged with a narrow gap between them, and a heat exchange pipe is passed therethrough. Become. The heat exchange pipes are arranged in a plurality of rows with gaps in the lateral direction of the fins and meandering in the longitudinal direction of the fins.

Both sides of the flat plate air heat exchanger 3 are bent in the same direction to form bent pieces 3b along both sides, and the space between the bent pieces 3b remains as a flat plate 3a. By forming it in a substantially U shape in a plan view, the longitudinal dimension of the chilling unit Y can be shortened, the installation space can be reduced, and the heat exchange efficiency can be improved.

As shown in FIG. 5, the fixed frame 16 is stretched over the upper and lower ends of the flat plate portion 3 a of the air heat exchanger 3. The upper end of the fixed frame 16 is bent in a bowl shape (substantially U-shaped) and is hooked over the inner surface upper portion, the upper end surface, and the outer surface upper portion of the flat plate portion 3a. Further, the fixed frame 16 is formed in a ladder shape, and can be used as a scaffold for an operator during maintenance work.

After fixing the pair of

air heat exchangers

3 and 3 so as to be substantially V-shaped in a side view using the fixed frame 16, a fan base 50 as a connecting member is installed between the upper ends of the fixed frame 16. The inclination angle of the air heat exchanger 3 is maintained.

A fan motor 51 constituting the blower S is attached to the fan base 50, and a fan 52 is fitted on the rotating shaft of the fan motor 51. As described above, the fan 52 is disposed so as to face the cylindrical outlet 5 provided in the top plate 4, and the fan guard 6 is provided in the outlet 5.

The lower end portion of the fixed frame 16 is attached and fixed to the first drain pan 7a in a state where the air heat exchanger 3 is tilted obliquely. However, since the air heat exchanger 3 is tilted, the air heat exchanger 3 is tilted. 3 and a gap between the lower end surface of the first drain pan 7a. Therefore, the first drain pan 7a is configured as described below.

FIG. 6 is a perspective view of the first drain pan 7a.
The first drain pan 7a has a rectangular dish shape, and is gradually inclined downward from both side end portions in the lateral direction toward the central portion. Accordingly, a linear deepest portion e is formed in the central portion of the first drain pan 7a along the longitudinal direction, and a drain port 55 to which the drain hose is connected is provided at a part of the deepest portion e.

A pair of heat exchanger pedestals 57 are provided opposite to each other on both ends of the first drain pan 7a. Contrary to the inclination direction of the first drain pan 7a, each heat exchanger base 57 is gradually inclined upward from both side end portions in the short direction toward the central portion, and the central portion is the highest. The side edges in the short direction are the lowest.

In the air heat exchanger 3 (not shown) that is disposed on the first drain pan 7 a in an inclined manner, the bent piece portion 3 b constituting the heat exchanger 3 is placed on the heat exchanger base 57. Accordingly, the heat exchanger pedestal 57 fills the gap between the lower end surface of the air heat exchanger 3 and the first drain pan 7a, and the heat exchange efficiency of the air heat exchanger 3 is not affected.

Further, the first drain pan 7a is provided with a pair of flat piece portions 58 opposed to each other between the heat exchanger bases 57 provided on the left and right. Each flat piece portion 58 is formed long in a direction orthogonal to the heat exchanger base 57, and the lower end portion of the fixed frame 16 is placed on each flat piece portion 58. The lower end portion of the fixed frame 16 is fixed to the flat piece portion 58 with a screw or the like.

Two cylindrical bodies 59 are provided side by side between one end portions of each flat piece portion 58, and a refrigerant pipe connected to the air heat exchanger 3 is inserted into each cylindrical body 59. Small-diameter cylindrical bodies 60 are provided at opposite ends of the flat piece portions 58, and a power cord connected to the fan motor 51 is inserted into the cylindrical bodies 60.

FIG. 7 is a perspective view of only the water circuit Z. FIG.
As described above, the water circulation pump 13 is connected to the first water pipe P1 as an introduction pipe, and the water circulation pump 13 and the first water heat exchanger 11 are communicated with each other through the second water pipe P2. A third water pipe P3 communicates with the first water heat exchanger 11 and the second water heat exchanger 12, and a fourth water pipe P4 is provided as a lead-out pipe below the second water heat exchanger 12. Is connected.

As shown in FIG. 2 and FIG. 7, the water circulation pump 13 is disposed at a substantially intermediate portion between the lowermost portion and the uppermost portion of the water circuit Z. As a result, even if air is mixed into the water circuit Z, the air does not accumulate in the water circulation pump 13. There is always priming water inside the water circulation pump 13, and it is possible to prevent the water circulation pump 13 from being poorly activated due to air contamination.

Furthermore, the first water pipe P1 and a part of the second water pipe P2 are present at the highest portion of the water circuit Z in the height from the arrangement surface of the chilling unit Y. The automatic air venting device 61 is provided in a part of the first water pipe P1 and the second water pipe P2 which are the highest parts of the water circuit Z.
The automatic air vent device 61 has a float in the valve body, and when air accumulates around the float, the float loses buoyancy and sinks, and the valve opens. That is, the air in the water pipe is automatically removed from the valve body by opening the valve.

For some reason, a large amount of air that can accumulate in the water circulation pump 13 may be mixed. However, since the automatic air venting device 61 is provided, air is automatically discharged to the outside, and air does not accumulate inside the water circulation pump 13. The water circulation pump 13 always has priming water, which prevents starting failure due to air contamination.
Although not particularly shown, the automatic air vent device 61 is provided with a check valve. Since there are many cases where the water pipe Z has a negative pressure, this is provided in order to prevent air mixture (backflow) when a reverse pressure is applied.

FIG. 8 is a configuration diagram of the refrigeration cycle of the chilling unit Y including the first to fourth refrigeration cycles R1 to R4.
The first and second refrigeration cycles R1 and R2 constitute the first refrigeration cycle unit 1RA, and the third and fourth refrigeration cycle units R3 and R4 constitute the second refrigeration cycle unit 2RB. Constitute.

Since the refrigeration cycle has the same configuration except for a part, only the first refrigeration cycle R1 will be described here, and the second to fourth refrigeration cycles R2 to R4 will be assigned the same numbers. Thus, a new description is omitted.
The first port of the four-way valve 18 is connected to the discharge side refrigerant pipe of the variable capacity compressor 17, and the refrigerant pipe connected to the second port of the four-way valve 18 is branched to form a pair of air heat exchangers. 3 and 3 are communicated. The pair of

air heat exchangers

3, 3 are provided to face each other as described with reference to FIGS. 4 and 5 and constitute a set of heat exchanger modules M.

The heat exchange pipes constituting each of the

air heat exchangers

3 and 3 are collected into a collecting pipe and communicated with a branched refrigerant pipe provided with an expansion valve 19. The branched refrigerant pipes are also combined into one, and communicated with the first refrigerant flow path 40 provided in the first water heat exchanger 11 via the first receiver 10a.

In addition, although the said expansion valve 19 was each provided in the branched refrigerant pipe, it is not limited to this, You may make it provide in the refrigerant pipe which put the branched refrigerant pipe into one. Therefore, one expansion valve 19 may be used.
The first refrigerant flow path 40 communicates with the third port of the four-way valve 18 via a refrigerant pipe. The fourth port of the four-way valve 18 communicates with the suction portion of the compressor 17 via the gas-liquid separator 20 via the refrigerant pipe.

Thus, while the refrigeration cycle R1 of the first system is configured, as the water circuit Z, for example, a first water pipe P1 that is a return pipe from a place to be air-conditioned is connected to the water circulation pump 13. The water circulation pump 13 is connected to the water flow path 33 in the first water heat exchanger 11 through the second water pipe P2.

The water flow path 33 of the first water heat exchanger 11 is communicated with the water flow path 33 of the second water heat exchanger 12 via the third water pipe P3. In the second water heat exchanger 12, the fourth water pipe P4 communicates with the water flow path 33 and is led from the fourth water pipe P4 to the place to be air-conditioned.

The refrigeration cycle R2 of the second system is configured in exactly the same manner, and in particular, a refrigerant pipe communicating the second receiver 10b and the four-way valve 18 is provided in the second refrigerant flow path 41 in the first water heat exchanger 11. Connected.
That is, in the first water heat exchanger 11, the first refrigerant flow path 40 and the second refrigerant flow path 41 are alternately provided on both sides of one water flow path 33, and one water heat exchanger 11 11 is shared by the first and second two refrigeration cycles R1 and R2 and connected in parallel.

Similarly, the second water heat exchanger 12 also has a first refrigerant flow path 40 communicating with the third receiver 10c on both sides of one water flow path 33 and a second refrigerant flow communicating with the fourth receiver 10d. The paths 41 are alternately provided, and the third and fourth two refrigeration cycles R3 and R4 share one hydrothermal exchanger 12 and are connected in parallel.

Thus, the machine room 2 is provided with the water circulation pump 13, the first water heat exchanger 11 and the second water heat exchanger 12, and the first to fourth water pipes P1 to P4 are The water circulation pump 13, the first water heat exchanger 11, and the second water heat exchanger 12 are connected in series.
The first refrigeration cycle R1 and the second refrigeration cycle R2 constitute the first refrigeration cycle unit 1RA. The third refrigeration cycle R3 and the fourth refrigeration cycle R4 The second refrigeration cycle unit 2RB is configured.

In this chilling unit Y, in order to obtain cold water in order to perform a cooling action, it will be described below.
For example, when the compressors 17 of the first to fourth refrigeration cycles R1 to R4 are driven all at once to compress the refrigerant, high-temperature and high-pressure refrigerant gas is discharged. The refrigerant gas is guided from the four-way valve 18 to the pair of air heat exchangers 3 and exchanges heat with the air blown by driving the blower S. The refrigerant gas condenses and is led to the expansion valve 19 and adiabatically expands.

After that, the liquid refrigerant merges and temporarily accumulates in each of the receivers 10a to 10d, and then is guided to the first refrigerant flow path 40 and the second refrigerant flow path 41 in the first hydrothermal exchanger 11, and the water flow Heat exchange with water led to the passage 33 is performed. The refrigerant in the

refrigerant channels

40 and 41 evaporates and takes latent heat of evaporation from the water in the water channel 33, and the water in the water channel 33 is cooled and converted to cold water.

In the first water heat exchanger 11, the first and second

refrigerant flow paths

40 and 41 communicating with the first and second refrigeration cycles R1 and R2 are provided to efficiently cool the water. When the water sent from the water circulation pump 13 is, for example, 12 ° C., it is cooled by 2.5 ° C. by the refrigerant guided to the

refrigerant flow paths

40, 41 of the two refrigeration cycles R1, R2 in the first water heat exchanger 11. The temperature drops to 9.5 ° C.

Then, the cold water whose temperature has decreased is led to the second water heat exchanger 12 via the first water pipe P1, and the first and second refrigeration cycles R3 and R4, which are also two systems here, communicate with each other. The heat exchange with the second

refrigerant channels

40 and 41 is performed.

Therefore, the water introduced at 9.5 ° C. is derived as cold water that is further cooled by 2.5 ° C. and lowered in temperature to 7 ° C. in the second hydrothermal exchanger 12. This cold water is led to a place to be air-conditioned through the second water pipe P2 which is a lead-out pipe, and cools the air led by the indoor fan to perform a cooling action.

The refrigerant evaporated in each of the

water heat exchangers

11 and 12 is guided to the gas-liquid separator 20 via the four-way valve 18 and separated from the gas and liquid, and then sucked into the compressor 17 and compressed again to be compressed as described above. repeat.
In this way, by connecting the

water flow paths

33 and 33 of the first water heat exchanger 11 and the second water heat exchanger 12 in series, the temperature of the chilled water is lowered in two stages, and thus more effective cooling performance. Can be obtained.

The first water heat exchanger 11 is connected to the first refrigeration cycle R1 and the second refrigeration cycle R2, which are two systems, so that one compressor 17 is mounted on each refrigeration cycle R1, R2. It becomes possible to do.
The second water heat exchanger 12 is also connected to the third refrigeration cycle R3 and the fourth refrigeration cycle R4, which are two systems, so that one compressor 17 is installed in each of the refrigeration cycles R3 and R4. It becomes possible to do.

Therefore, all the refrigeration cycles R1 to R4 are independent, so that it is not necessary to perform the oil leveling in the compressor 17 of the lubricating oil circulating in the refrigerant circuit, and it is possible to prevent the performance from being deteriorated due to the leveling. Even if the refrigeration cycle of one system is stopped, the operation can be continued with the other three refrigeration cycles, the influence of the operation stop can be minimized, and the reliability can be ensured.
In addition, since all the compressors 17 and the water circulation pump are variable in capacity, efficient operation is possible according to the cooling load.

In order to obtain hot water for the heating operation, it will be described below.
When the compressor 17 of each refrigeration cycle is driven all at once and the refrigerant is compressed, a high-temperature and high-pressure refrigerant gas is discharged. The refrigerant gas is led from the four-way valve 18 to the first refrigerant flow path 40 in the first water heat exchanger 11 and exchanges heat with water led from the water circulation pump 13 to the water flow path 33. The refrigerant is condensed and liquefied by the first water heat exchanger 11, and the water in the water flow path 33 is heated by the condensation heat.

Again, since the first refrigerant flow path 40 and the second refrigerant flow path 41 communicating with the two refrigeration cycles are provided in the first water heat exchanger 11 and the second water heat exchanger 12, Efficiently warm water. Since the first water heat exchanger 11 and the second water heat exchanger 12 communicate with each other in series, the temperature of the hot water rises over two stages to improve the heating performance.

The liquid refrigerant derived from the first water heat exchanger 11 is led to the first receiver 10a and the expansion valve 19, and after adiabatic expansion, is led to the

air heat exchangers

3 and 3 to evaporate. The evaporated refrigerant is sucked into the compressor 17 through the four-way valve 18 and the gas-liquid separator 20, and is compressed again to repeat the above-described refrigeration cycle. In other refrigeration cycles, it circulates in the same route.

In addition, during the heating operation for obtaining hot water, the refrigerant evaporates in the pair of

air heat exchangers

3 and 3 constituting the heat exchanger module M, condenses moisture in the air, and drain water adheres. When the outside air temperature is extremely low, the attached drain water is frozen and easily becomes frost. The sensor detects this frost formation and sends a signal to the control electronic component in the control box 8.

The control electronic component issues an instruction to switch the refrigeration cycle including the

air heat exchangers

3 and 3 whose frost formation is detected by the sensor from the heating operation to the cooling operation. The refrigeration cycle including the

air heat exchangers

3 and 3 that are not detected by the sensor continues the heating operation as it is.
In the refrigeration cycle switched to the cooling operation, the four-way valve 18 is switched, and the refrigerant is guided from the compressor 17 to the

air heat exchangers

3 and 3 through the four-way valve 18 and condensed to be converted into liquid refrigerant. Condensation heat is released as the refrigerant condenses, and the frost adhering to it is melted.

Since the shielding

plates

15 and 15 are provided on both sides of each heat exchanger module M, air does not escape from between the

air heat exchangers

3 and 3 facing each other, and air from the adjacent heat exchanger module M is also present. To prevent intrusion. Therefore, the

air heat exchangers

3 and 3 during the defrosting operation and the

air heat exchangers

3 and 3 that continue the heating operation do not affect each other.

Further, for example, the refrigerant evaporates in the first refrigerant flow path 40 in the first water heat exchanger 11, and the hot water led to the water flow path 33 is cooled. However, the second refrigerant flow path 41 in the first water heat exchanger 11 communicates with the second refrigeration cycle R2 that continues the heating operation, and the refrigerant condenses and condenses heat into the hot water in the water flow path W. Released.

Therefore, the temperature drop of the hot water in the state derived from the first water heat exchanger 11 is kept in a very small range. After all, if the defrosting operation is switched only for one set of refrigeration cycles, the temperature drop of the hot water supplied from the first water heat exchanger 11 is only slight.
Further, since all the compressors 17 and the water circulation pump 13 are variable in capacity, efficient operation is possible according to the heating load.

As described above, the control box 8, the plurality of refrigeration cycle units 1 RA and 2 RB, the water circulation pump 13, the refrigerant pipe and the water pipe are housed in the machine room 2. The side plate 2a and the end plate 2b are placed inside. That is, as shown in FIG. 1, in the completed chilling unit Y, there is no member exposed from the housing F.

Therefore, not only can the construction work performed after the chilling unit Y is carried into the installation site be reduced, but it is advantageous in that it can save space. In particular, since the water circulation pump 13 is accommodated in the housing, it is not exposed to wind and rain and direct sunlight, and this can increase the life.

In the chilling unit Y, a control box 8, a second refrigeration cycle unit 2RB, a first refrigeration cycle unit 1RA, and a water circulation pump 13 are arranged in this order from the front N front side to the back side of the housing F. At the end on the front N side where the control box 8 is provided, a passage T (or a space) where the chilling unit Y is arranged is provided.

That is, if the end plate 2b is removed while maintaining the position on the passage T without the operator entering the back from the passage T during the maintenance work, the control box 8 appears immediately, and the workability can be improved.

The first system refrigeration cycle R1 and the second system refrigeration cycle R2 share the first water heat exchanger 11, and constitute a first refrigeration cycle unit 1RA. Similarly, the refrigeration cycle R3 of the third system and the refrigeration cycle R4 of the fourth system share the second water heat exchanger 12, and constitute a second refrigeration cycle unit 2RB.

Each of the first refrigeration cycle unit 1RA and the second refrigeration cycle unit 2RB accommodated in the machine room 2 includes two compressors 17, two four-way valves 18, and two (actually four). ) Expansion valve 19, two gas-liquid separators 20, and one

hydrothermal exchanger

11 or 12, each of which has two refrigeration cycles R 1, one hydrothermal exchanger. R2 or R3 and R4 are connected in parallel.
Since the first refrigeration cycle unit 1RA and the second refrigeration cycle unit 2RB are each placed on the second drain pan 7b and the refrigeration cycle is unitized, it is easy to assemble these components. .

Since the first water heat exchanger 11 in the first refrigeration cycle unit 1RA and the second water heat exchanger 12 in the second refrigeration cycle unit 2RB are connected in series with each other, cold water or Hot water will be generated, and the overall thermal efficiency of the refrigeration cycle will be improved.

One heat exchanger module M includes two

air heat exchangers

3 and 3 facing each other. The first refrigeration cycle unit 1RA and the second refrigeration cycle unit 2RB each include two heat exchanger modules M, two in total. And each heat exchanger module M is mounted on the 1st drain pan 7a provided independently.

Since the first drain pans 7a on which the heat exchanger modules M are placed in this way are independent of each other, the assembly work of the heat exchanger modules M is facilitated. In each refrigeration cycle system R1 to R4, when defrosting is performed independently, re-freezing does not occur in other refrigeration cycle systems.

FIG. 9 shows an example in which the apparatus is composed of a plurality of chilling units Y, which is optimal for preparing for a large-scale building. That is, three rows of chilling units Y directly connected to the four heat exchanger modules M described in FIG. 1 are provided in parallel.

The chilling unit Y used here is provided with a plurality of air suction ports 65 at predetermined intervals on the side of the lower frame Fb constituting the housing F, particularly along the longitudinal direction. Usually, the chilling unit is installed on a support base for piping a local water pipe (return pipe or forward pipe) in the lower part. By providing the air suction port 65 at the lower part of the chilling unit Y, the upper surface space of the lower frame Fb of the chilling unit Y and the space at the lower part of the support base are communicated.

Since the chilling units Y directly connected to the four heat exchanger modules M are arranged in three rows, the lower frames Fb on both the left and right sides are the lower portions of the chilling units Y in both rows, particularly for the chilling unit Y in the middle row. It is almost in close contact with the frame Fb. However, the opening state of the air suction port 65 provided in each lower frame Fb is maintained as it is.

As shown in FIG. 10, in a state where all the chilling units Y are operated at the same time, the four blowers S provided in each chilling unit Y are also driven at the same time. Therefore, air is sucked in from the left and right sides of the heat exchanger module M constituting each row chilling unit Y, and after heat exchange with each heat exchanger module M, is blown out from the upper end portion.

Especially, since there are no other components on one side of the chilling unit Y in the left and right side rows, the heat exchange air is smoothly drawn in. However, there are chilling units Y facing each other on the other side of the chilling units Y in the left and right rows and the left and right sides of the chilling units Y in the middle row.

With the operation of each blower S, air is sucked from one end surface in the longitudinal direction of the chilling unit Y and from the space U between the chilling units Y facing each other. However, since the space U is originally formed along the longitudinal direction of the chilling unit Y, the amount of air sucked tends to be insufficient.

Here, as described above, a plurality of air suction ports 65 are provided in the lower frame Fb constituting the casing F of the chilling unit Y. When the blower S is driven, air is also sucked from the air suction port 65 and guided to the heat exchanger module M along the space U. Therefore, the shortage of the heat exchange air amount with respect to the heat exchanger module M is solved, and the heat exchange efficiency is improved.

Note that the present invention is not limited to the above-described embodiments as they are, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. Various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the above-described embodiments.

According to the present invention, the maintenance work for the control box can be facilitated, and the workability can be improved.

Claims

A housing in which a heat exchanging unit having an air heat exchanger is mounted on the top and a machine room is formed inside,
A control box including a plurality of independent refrigeration cycle units including a refrigeration cycle apparatus excluding the air heat exchanger, one water circulation pump, and control electronic components housed in the machine room in the housing And
A chilling unit in which the water circulation pump, the first refrigeration cycle unit, the second refrigeration cycle unit, and the control box are arranged in order from the back side of the housing to the front side.
The first refrigeration cycle unit and the second refrigeration cycle unit housed in the machine room in the housing include a plurality of refrigeration cycles that are connected in parallel with each other sharing a water heat exchanger. The chilling unit according to claim 1.
The water heat exchanger provided in the first refrigeration cycle unit and the water heat exchanger provided in the second refrigeration cycle unit are communicated with each other in series via a water pipe. The chilling unit described.
The chilling unit according to claim 3, wherein the water circulation pump is disposed at a lowermost part of a water circuit including the water pipe and the water heat exchanger or between the lowermost part and the uppermost part.
The heat exchange unit mounted on the upper part of the housing includes a heat exchanger module that arranges a pair of air heat exchangers facing each other,
The heat exchanger module is provided corresponding to the number of refrigeration cycles of each of the first refrigeration cycle unit and the second refrigeration cycle unit,
5. The chilling unit according to claim 2, wherein each of the heat exchanger modules is placed on a drain pan independent of each other.
The chilling unit according to any one of claims 1 and 4, wherein the compressor and the water circulation pump are all variable in capacity.
The casing is composed of a lower frame along the casing installation surface, an upper frame on which the air heat exchanger is placed, and a vertical frame connecting the lower frame and the upper frame.
The chilling unit according to claim 1, wherein an air suction port is opened in the lower frame.