WO2011024371A1

WO2011024371A1 - Evaporative cooling device

Info

Publication number: WO2011024371A1
Application number: PCT/JP2010/004387
Authority: WO
Inventors: 佐藤祐; 元永昇; 西村靖史
Original assignee: 株式会社ササクラ
Priority date: 2009-08-28
Filing date: 2010-07-05
Publication date: 2011-03-03
Also published as: CN102265101A; JP5483959B2; JP2011047618A

Abstract

Disclosed is an evaporative cooling device provided with an evaporation chamber in which an evaporative liquid is boiled and evaporated by reducing the pressure to a pressure lower than atmospheric pressure, a vapor compressor which compresses vapor generated in the evaporation chamber, and a condensation chamber in which the vapor compressed by the vapor compressor is condensed, wherein a single container is divided by double partition plates into two chambers, i.e., the evaporation chamber and the condensation chamber, and a space is provided between the partition plates.

Description

Evaporative cooling device

The present invention relates to an evaporative cooling device that performs cooling using evaporation and condensation of a liquid having evaporability such as water.

As such an evaporative cooling device, there is a steam compression refrigerator (for example, see Patent Document 1). Referring to FIG. 7, in the steam compression refrigerator of Patent Document 1, an evaporator 60, a condenser 62 interconnected to the evaporator 60 by a connecting pipe 61, and the evaporator 60 and the condenser 62. And a compressor 64 disposed in a connecting pipe (duct) 63 that connects the two to each other.

In this steam compression refrigerator, the inside of the evaporator 60 is evaporated by evacuating the interior with the vacuum pump 65 and the compressor 64 is operated, and the temperature in the evaporator 60 is lowered to produce cold water A cold water pump 66 supplies the load 67 such as a radiant panel. The water vapor evaporated by the evaporator 60 is compressed by the compressor 64 and then guided to the condenser 62. In the condenser 62, it is condensed by the cooling water from the cooling tower 68 and returned to the water again. The cooling water heated up by the condensation of the high temperature steam is sent to the cooling tower 68 by the cooling water pump 69, and the heat is radiated to the outside by the cooling tower 68.

JP 2006-9789 A

In such a conventional example, the evaporator 60 and the condenser 62 are each constituted by individual containers, and in order to arrange the individual containers in this way, a large installation space is required and the apparatus itself is large. Along with this, there is a problem that costs increase in terms of materials and manufacturing.

The present invention has been made in view of the above-described points, and it is an object of the present invention to reduce the installation space and to reduce the size of the entire apparatus, and further reduce the cost in terms of materials and manufacturing.

In the present invention, in order to achieve the above object, the following configuration is provided.

An evaporative cooling apparatus according to the present invention includes an evaporation chamber for boiling and evaporating an evaporable liquid at a pressure lower than atmospheric pressure, a vapor compressor for compressing vapor generated in the evaporation chamber, and the vapor compressor compressing the vapor. A condensing chamber for condensing steam, and having the evaporation chamber and the condensing chamber separated from each other by at least a double partition inside a single container, and a space is interposed between the double partitions is doing.

The shape of the single container is not particularly limited as long as it can be sealed, and may be, for example, a cylindrical shape that can be sealed, a rectangular tube shape, or the like. The partition may be double or more. The partition is not particularly limited as long as the inside of a single container can be partitioned into at least two chambers, an evaporation chamber and a condensation chamber.

In the single container, the volumes of the evaporation chamber and the condensation chamber may be equally divided by the partition, or may be partitioned unevenly.

The partition may be composed of, for example, a plate material that is separate from the container, and may be integrated with the container by welding or the like. In this case, the partition may be referred to as a partition plate, or may constitute a part of the container wall and may be referred to as a partition wall.

According to the evaporative cooling device of the present invention, the evaporation chamber and the condensing chamber are formed in a single container instead of separate containers. Therefore, the evaporation chamber and the condensing chamber are configured as separate containers, and two containers are formed. Unlike the conventional apparatus that has been installed, the overall size of the apparatus can be reduced, the installation space can be reduced, and further, the material cost and thus the manufacturing cost can be reduced. In addition, since the space is interposed between the double partitions interposed between the evaporation chamber and the condensation chamber, this space is used as a space for heat insulation to effectively transfer heat from the condensation chamber to the evaporation chamber. It can block | block and can suppress the fall of thermal efficiency effectively.

From the viewpoint of blocking heat transfer, the material constituting the partition may be a material having a low thermal conductivity different from that of the container, and a heat insulating material is filled in the space between the double partitions. May be.

In another embodiment of the present invention, the space interposed between the double partitions is in a reduced pressure state.

The space may be sealed in a reduced pressure state at the manufacturing stage, or the space may be connected to a vacuum pump or the like to be in a reduced pressure state.

When the space between the double partitions is sealed at atmospheric pressure, after the operation of the evaporative cooling device is started, reduced evaporation on both sides of the double partition, that is, both sides of the space, is performed. The differential pressure between the chamber and the decompressed condensing chamber and the space is increased. Therefore, in this case, since the double partition needs to withstand the differential pressure, it is necessary to increase the thickness of a member constituting the partition, for example, the partition plate. However, in this embodiment, since the space is in a reduced pressure state, the differential pressure is reduced, and the thickness of the partition plate can be reduced.

In a preferred embodiment of the present invention, any one of the evaporating chamber and the condensing chamber and a space between the two partitions communicate with each other through a pressure guiding tube, and the pressure in the one of the chambers is The pressure in the space is the same pressure.

According to this embodiment, the pressure in the space between the double partitions is the same as the internal pressure of either the evaporation chamber or the condensation chamber. The stress due to the pressure is not received, so that the material cost can be reduced by making the structure thinner than the other partition. Furthermore, since the space becomes a vacuum lower than the atmospheric pressure, heat transfer from the condensation chamber to the evaporation chamber can be effectively blocked.

In another preferred embodiment of the present invention, the double partition is constituted by two partition plates facing each other across the space.

According to this embodiment, since the partition plates sandwich the space between them, heat transfer between the evaporation chamber and the condensation chamber can be prevented via the partition plates.

In still another preferred embodiment of the present invention, the single container includes a cylindrical container body, and the evaporation chamber and the two partition plates bisect a circular cross section of the container body. Each of the condensing chambers is partitioned and formed in a semicylindrical shape.

According to this embodiment, since the inside of the cylindrical container body is divided into a semi-cylindrical shape by the two partition plates and the evaporation chamber and the condensation chamber are partitioned, the apparatus can be downsized with a simple structure. it can.

According to the apparatus of the present invention, since the evaporation chamber and the condensation chamber are formed in the same container, the entire apparatus is reduced in size and installed as compared with the conventional apparatus in which the evaporation chamber and the condensation chamber are formed as separate containers. Space and material and manufacturing costs can be reduced. Moreover, since the space between the evaporation chamber and the condensing chamber is at least double partitioned, the heat transfer from the condensing chamber to the evaporation chamber is effectively blocked by the space, effectively preventing a decrease in thermal efficiency. can do.

FIG. 1 is a diagram showing a system configuration example of an evaporative cooling apparatus according to an embodiment of the present invention. FIG. 2 is a perspective view of the container of FIG. FIG. 3 is a side view of the container of FIG. 4 is a cross-sectional view taken along the line AA in FIG. FIG. 5 is a diagram showing a system configuration example of an evaporative cooling device according to another embodiment of the present invention. FIG. 6 is a cross-sectional view of a container according to another embodiment of the present invention. FIG. 7 is a diagram showing a system configuration example of a conventional apparatus.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 shows a system configuration of an evaporative cooling apparatus according to an embodiment of the present invention. Referring to FIG. 1, in the evaporative cooling apparatus according to this embodiment, the inside of a single sealed container 1 is divided into two chambers by two

partition plates

2a and 2b as described later. One chamber is the evaporation chamber 3, the other chamber is the condensation chamber 4, and the space 5 is interposed between the two

partition plates

2a and 2b. This space 5 can insulate the evaporation chamber 3 and the condensation chamber 4.

Thus, by separating the inside of the sealed single container 1 by the two

partition plates

2a and 2b, the evaporation chamber 3 and the condensation chamber 4 can be disposed compactly adjacent to each other inside the single container 1. Therefore, it is possible to reduce the size of the entire apparatus and to reduce manufacturing costs and material costs. In addition, it is possible to effectively suppress the heat transfer between the two

chambers

3 and 4 to prevent a decrease in thermal efficiency.

The evaporating chamber 3 evaporates an evaporating liquid, for example, water, which is contained in the evaporating chamber 3 at a reduced pressure lower than the atmospheric pressure. The evaporating chamber 3 pumps water accumulated in the evaporating chamber 3 from the evaporating liquid outlet 6 via the pipe 8 by the circulation pump 7 and supplies a cooling source to the indirect heat exchanger 9 on the load side such as a cooling place. Is supplied to the evaporative liquid inlet 11 via the conduit 10 and is then circulated back into the evaporating chamber 3 so as to be ejected from the upper nozzle 12.

The condensing chamber 4 draws a cooling fluid, for example, water, stored in the condensing chamber 4 from the cooling fluid outlet 13 through the pipe 16 by the circulation pump 14 and supplies it to the indirect heat exchanger 15 on the heat radiation side to the atmosphere. It is cooled by heat dissipation. The condensation chamber 4 circulates by supplying the water cooled by the indirect heat exchanger 15 to the cooling liquid inlet 18 via the pipe line 17 and returning it to the condensation chamber 4 so as to be ejected from the nozzle 19 at the upper part thereof. Is configured to do.

Further, the vapor outlet 20 of the evaporation chamber 3 and the vapor inlet 21 of the condensation chamber 4 are connected by a vapor duct 22, and the vapor from the evaporation chamber 3 is compressed in the middle of the vapor duct 22 to condense the chamber 4. A root type compressor is provided as the steam compressor 23 to be fed into the tank. In this roots type compressor, for example, steam can be compressed by about 10 ° C. due to a temperature difference. The steam compressor 23 is not limited to a Roots type compressor, and a blower compressor, a screw type compressor, and other compressors can be used.

The inside of the evaporating chamber 3 and the inside of the condensing chamber 4 are kept at a reduced pressure lower than the atmospheric pressure by a vacuum pump 25 connected to the vacuum exhaust port 24 of the condensing chamber 4. It is comprised so that boiling evaporation may be performed.

The connection port 30 at the bottom of the evaporation chamber 3 and the connection port 31 at the bottom of the condenser 4 are connected by a communication pipe 26, and a part of the water in the condensation chamber 4 is passed through the communication pipe 26. 3 is supplied.

As described above, the evaporation chamber 3 and the condensation chamber 4 are doubled by the two

partition plates

2a and 2b provided in the center of the container 1. The space 5 for heat insulation between the

partition plates

2a and 2b is made to have the same pressure as the evaporation chamber 3 by the pressure guiding pipe 27 that connects the connection port 29 corresponding to the space 5 and the connection port 28 of the evaporation chamber 3. . As a result, the partition plate 2b on the evaporation chamber 3 side of the

partition plates

2a and 2b is not subjected to stress due to the differential pressure, and a thinner partition plate can be used than the partition plate 2a on the condensation chamber 4 side. it can.

2 is a perspective view of the container 1 of FIG. 1, FIG. 3 is a side view thereof, and FIG. 4 is a cross-sectional view taken along the line AA of FIG. 3. In these drawings, FIG. Corresponding parts bear the same reference symbols.

The container 1 is made of stainless steel, for example, and includes a cylindrical container body 1a, a front plate 1b that closes the opening at the front end, and a rear plate 1c that closes the opening at the rear end. The front plate 1b and the rear plate 1c close the space 5 between the evaporation chamber 3, the condensation chamber 4, and the

partition plates

2a and 2b, respectively. The material constituting the container 1 is not limited to a metal such as stainless steel but may be a hard synthetic resin.

As shown in FIG. 3, the container main body 1a is disposed sideways by four mounting legs 51 so that its axis 50 is horizontal. In the cylindrical container body 1a, two flat plate-

like partition plates

2a and 2b extending in the direction of the axis 50 of the container body 1a are arranged in the diameter direction so as to bisect the circular cross section of the container body 1a. The evaporating chamber 3 and the condensing chamber 4 are partitioned and formed in a semicylindrical shape.

The vapor outlet 20 is provided at the upper part of the main body on the evaporation chamber 3 side, while the vapor inlet 21 is provided at the upper part of the main body on the condensation chamber 4 side. The front plate 1b on the evaporation chamber 3 side is provided with a connection port 28 to which one end of the pressure guiding tube 27 is connected, while the upper portion of the main body corresponding to the heat insulating space 5 sandwiched between the two

partition plates

2a and 2b. Is provided with a connection port 29 to which the other end of the pressure guiding tube 27 is connected.

The evaporative liquid inlet 11 is provided at three locations on the main body side on the evaporation chamber 3 side, while the cooling fluid inlet 18 is provided at three locations on the main body side on the condensation chamber 4 side. Further, an evaporative liquid outlet 6 is provided near the front surface of the lower part of the main body on the evaporation chamber 3 side, while a cooling liquid outlet 13 is provided near the rear surface of the lower part of the main body on the condensing chamber 4 side. Furthermore, a connection port 30 to which one end of the communication pipe 26 is connected is provided on the front side of the lower part of the main body on the evaporation chamber 3 side, while the connection pipe 26 is provided on the front side of the lower part of the main body on the condensing chamber 4 side. A connection port 31 to which the end is connected is provided. A drain pipe (not shown) is provided at the bottom of the heat insulating space 5 sandwiched between the two

partition plates

2a and 2b, and in the unlikely event that refrigerant is mixed into the space 5. Can discharge the refrigerant.

Exhaust ports

32 and 24 for vacuum exhaust are respectively provided on the evaporation chamber 3 side and the condensation chamber 4 side of the front plate 1b.

Note that a mounting seat (not shown) for mounting the vapor compressor 23 and a motor for driving the vapor compressor 23 is provided on the upper portion of the container main body 1a. The installation space is reduced. The above-described system shown in FIG. 1 is configured using the container 1 having such a configuration.

Referring to FIG. 1 again, the water that has been cooled by boiling and evaporating in the evaporation chamber 3 under reduced pressure is sent to the load side by the circulation pump 7 via the pipe 8 and indirectly. The water which has been subjected to heat exchange in the heat exchanger 9 and used for cooling or the like and whose temperature has risen on the load side returns to the evaporation chamber 3 again via the pipe line 10, and is cooled by boiling and evaporating again here. The temperature is lowered.

On the other hand, the vapor generated by boiling evaporation in the evaporation chamber 3 is sucked and compressed by the vapor compressor 23 to reach the condensation chamber 4 and condensed by cooling in the condensation chamber 4. A part of the pressure is supplied to the evaporation chamber 3 through the communication pipe 26 due to a pressure difference.

Further, the water condensed and liquefied by releasing heat in the condensing chamber 4 is sent to the heat radiation side by the circulation pump 14 via the pipe line 16 and cooled by heat radiation to the atmosphere in the indirect heat exchanger 15, The circulation of returning to the condensation chamber 4 through the pipe line 17 is repeated.

In the evaporative cooling apparatus having the above configuration, the evaporation chamber 3 and the condensation chamber 4 are partitioned by dividing the inside of a single container 1 by two

partition plates

2a and 2b. The overall size can be reduced to reduce the installation space and cost. In addition, since the space between the evaporation chamber 3 and the condensing chamber 4 is double partitioned with the space 5 for heat insulation interposed, heat transfer from the condensing chamber 4 to the evaporation chamber 3 is interrupted to prevent a decrease in thermal efficiency. be able to.

As another embodiment of the present invention, the space 5 for heat insulation is not connected to the evaporation chamber 3 or the condensing chamber 4 by the pressure guiding tube to be the same pressure as the evaporation chamber 3 or the condensing chamber 4. 5 may simply be in a reduced pressure state.

If the space 5 for heat insulation is sealed at atmospheric pressure, after the operation of the evaporative cooling device is started, the space 5 and the decompressed evaporation chamber 3 and the decompressed condensing chamber 4 on both sides thereof are separated. Since the differential pressure between them becomes large, the

partition plates

2a and 2b need to be thick so that they can withstand the differential pressure. A pressure can be made small and the

partition plates

2a and 2b can be made thin.

In order to bring the space 5 for heat insulation into a reduced pressure state, the space 5 may be sealed in a reduced pressure state at the manufacturing stage, or the space 5 may be directly connected via a pipe 55 as shown in FIG. The pressure may be reduced by connecting to the vacuum pump 25. Further, the pressure may be reduced by connecting to a vacuum pump different from the vacuum pump 25.

In the above-described embodiment, the cylindrical container 1 is arranged in the horizontal direction. However, as another embodiment, the cylindrical container 1 may be arranged in the vertical direction. Further, in the above-described embodiment, the circular cross section of the cylindrical container body 1a is divided into two, and the evaporation chamber 3 and the condensation chamber 4 are partitioned and formed in a semi-cylindrical shape. However, as another embodiment, FIG. The evaporation chamber and the condensation chamber may be partitioned and formed in a cylindrical shape by partitioning so as to be orthogonal to the axis 50 of the cylindrical container body 1a shown in FIG.

Furthermore, in the above-mentioned embodiment, although the inside of the cylindrical container 1 is partitioned twice by the

flat partition plates

2a and 2b, as another embodiment of the present invention, for example, in the cross-sectional view of FIG. As shown, cylindrical

double partition members

37a and 37b are concentrically housed inside a cylindrical container 36, the inside of the inner partition member 37b is the inner container 36a, and the outer partition member 37a A section between the outer periphery and the inner periphery of the container 36 may be formed as an annular outer container 36b. In this case, one of the inner container 36 a and the outer container 36 b may be the evaporation chamber 3 and the other may be the condensation chamber 4. A heat insulating space 38 is interposed between the

double partition members

37a and 37b. This space 38 is preferably set to the same pressure as either the evaporation chamber 3 or the condensation chamber 4. In addition, both ends of the container 36 and the

partition members

37a and 37b are closed with a lid, and the lid is provided with a necessary vapor or liquid inlet / outlet corresponding to the evaporation chamber 3 and the condensation chamber 4.

Further, since the temperature of the evaporation chamber 3 is lower than that of the condensation chamber 4, the inner vessel 36 a is used as the evaporation chamber 3 and the outer vessel 36 b is used as the condensation chamber 4 in order to reduce the thermal influence that the evaporation chamber 3 receives from the atmosphere. Is preferable.

In FIG. 6, the inner container 36 a and the outer container 36 b are arranged concentrically, but may be eccentric as another embodiment.

In the above embodiment, water is used as the evaporating liquid, but the present invention is not limited to water, and alcohol or other evaporating liquids may be used.

The present invention is particularly useful as a steam compression refrigerator.

DESCRIPTION OF

SYMBOLS

1,36 Container 1a Container

main body

2a, 2b Partition plate 3 Evaporation chamber 4

Condensing chamber

5,38

Space

37a, 37b Partition member

Claims

An evaporation chamber for boiling and evaporating the evaporable liquid at a pressure lower than atmospheric pressure;
A vapor compressor for compressing the vapor generated in the evaporation chamber;
A condensing chamber for condensing the steam compressed by the steam compressor;
With
The evaporation chamber and the condensation chamber are mutually partitioned by at least a double partition inside a single container, and a space is interposed between the double partitions,
Evaporative cooling device.
The space interposed between the double partitions is in a reduced pressure state;
The evaporative cooling device according to claim 1.
Any one of the evaporation chamber and the condensing chamber and the space interposed between the double partitions communicate with each other through a pressure guiding pipe, The pressure in the space is the same pressure,
The evaporative cooling device according to claim 1.
The double partition is constituted by two partition plates facing each other across the space.
The evaporative cooling device according to any one of claims 1 to 3.
The single container includes a cylindrical container main body, and the evaporation chamber and the condensing chamber are divided into semi-cylindrical shapes so as to bisect the circular cross section of the container main body by the two partition plates. Formed,
The evaporative cooling device according to claim 4.