JPH08110107A - Cold air supply unit - Google Patents

Abstract

(57) [Summary] [Purpose] A movable cold air supply unit that can easily obtain low-temperature air below 0 ° C for competition facilities such as ice skating rinks and bobsleighs, and refrigerating freezers without using refrigerant such as CFCs. obtain. [Composition] An electric compressor, an air compressor and an air expander, which are integrally combined, an air compression and expansion device, a water-to-air heat exchanger, and an air-to-air heat exchanger are housed in one casing. Air pipes with an air pressure of 5 kg / cm ² or less are provided between these devices in the casing, and a cold air extraction connection port, a retin air intake connection port, a cooling water extraction connection port and a cooling water intake connection port are provided. Movable cold air supply unit equipped.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a movable cold air supply unit. More specifically, minus 5
The present invention relates to a compact low-temperature air generation unit capable of optionally supplying cold air of about 1.0 to 1.1 atm at about ℃ to minus 45 ℃ to a facility requiring ice making or a facility requiring cooling.

[0002]

2. Description of the Related Art A conventional general refrigeration cycle is constructed by using a refrigerant such as CFC or ammonia, and these refrigerants are circulated in a closed cycle. However, the most widely used CFCs are environmentally destructive substances, and in order to form a refrigeration cycle,
Since a high pressure of 20 kg / cm ² is required, refrigerators and heat pump units are configured with specifications that emphasize leakage prevention and pressure resistance of the entire system, and various types are used. .

On the other hand, there is also known an air treatment technique for obtaining low temperature air by compressing, cooling and expanding air without using a refrigerant such as CFC. For example,
As a compressor and an expander for that purpose, improvements are made in JP-A-5-113258, JP-A-6-213521 and JP-B-59.
-52343 and the like, and the ones proposed in JP-A-6-34212 and JP-A-52323377, which improve the separation of water in the treated air,
Regarding the control of the apparatus, JP-A-63-315866, JP-A-5-231732, JP-A-5-223375 and JP-A-2-97
850 and the like are known, and as for heat recovery, those proposed in JP-A-6-207755 and JP-A-6-213521 are known.

[0004]

[Problems to be Solved by the Invention] In the construction of winter type sports facilities such as ice rinks and bobsled facilities, and in the freezing and refrigerating field such as freezing refrigerators and containers regardless of stationary type or freezing type, refrigeration without using CFC. Although the air refrigeration methods proposed in the above publications have their respective characteristics, in reality, such air refrigeration methods are used for the construction of such facilities. It is no exaggeration to say that there is no record of success.

That is, there is no packaged pneumatic cold air supply device that can be transported to a construction site, is easy to handle, and is economical.
The present invention is intended to solve this problem.

[0006]

According to the present invention, an air compression / expansion device comprising an electric motor, an air compressor and an air expander integrally combined, a water-to-air heat exchanger, and an air-to-air heat exchanger. The exchanger and the exchanger are housed in a single casing, and the air pressure between these devices in the casing is 5 kg / cm ² or less, preferably 3 kg / cm ² or less, more preferably 2 kg / c.
Provide a movable cold air supply unit that is equipped with air piping of m ² or less and has a cold air outlet connection port, a retin air inlet port, a cooling water outlet port and a cooling water inlet port. .

Here, the compressor of the air compression / expansion device can be composed of two units, and in that case, the power of the electric motor and the power of the expander are transmitted through the gearbox in either compressor. To install. Further, the air pipe can be made of a resin pipe.

[0008]

In the cold air supply unit of the present invention, if water and electric power are available, cold air of about 1.0 to 1.1 atm can be immediately obtained at about -5 ° C to -45 ° C, and CFCs, etc. Since no refrigerant gas is used, there is no concern about environmental pollution due to leakage.

The unit of the present invention is a package having a simple structure in which a main component is an air compression and expansion device integrated product, a water-to-water heat exchanger and an air-to-air heat exchanger are housed in one casing. Therefore, it is movable, easy to use and easy to operate. Further, since it is packaged, it can be subjected to anti-vibration treatment and sound-proof treatment, so that the air treatment apparatus can be configured as a unit with less noise.

The air compression / expansion device is a combination of an electric motor, an air compressor, and an air expansion device which are integrated into one device. Therefore, the air compression / expansion device is packaged as compared with a device installed individually. Is advantageous to.

The air-to-air heat exchanger advantageously functions as a heat recovery heat exchanger in the unit of the present invention and has a dehumidifying function for obtaining dry air.
Moreover, since this can be constructed using a lightweight heat exchange material such as a resin material, it does not increase the load of the entire unit.

The water-to-air heat exchanger is for cooling the hot high pressure air leaving the compressor with water. This works well with a regular fin tube heat exchanger.

The pipe in the unit may be a low-pressure pipe of 5 kg / cm ² or less, and it is not necessary to use a metal pipe. For this reason, a resin pipe (for example, a vinyl chloride pipe, a polyethylene pipe, a polypropylene pipe) or the like is used to finish at low cost. Flexible tubes such as resin-based flexible tubes and rubber-based tubes can be optionally used. For this reason, the degree of freedom of piping is increased during packaging, and the size can be reduced. In addition, the ability to use resin-based or rubber-based flexible pipes eliminates sharp bends, reduces pressure loss during ventilation, and contributes to improved performance.

When installing the unit of the present invention in the field, air pipes are connected to the cold air intake connection port and the retin air intake connection port mounted on the unit,
All you have to do is connect the water pipes to the cooling water outlets and inlets, and then turn on the power to take out any cold air. Further, since the above-mentioned connection may be a simple operation such as tightening a band and does not require any advanced technology, the workability in the field is extremely good.

Further, depending on the purpose of use of the unit of the present invention, a dehumidifier may be placed horizontally or a control panel may be attached to this unit to perform a processing operation suitable for the purpose.

An embodiment of the unit of the present invention shown in the drawings will be described below.

[0017]

1 is a perspective view showing an embodiment of a packaged cold air supply unit according to the present invention. As shown in the figure, the unit of the present invention is an air compression and expansion device in which an electric motor 2, two compressors 3a and 3b, a gear box 4 and an expander 5 are integrally combined in one casing 1 having a rectangular parallelepiped shape. A
It is installed on the casing bottom plate 6, and the water-to-air heat exchanger B and the air-to-air heat exchanger C are arranged in the upper space of the casing 1, and the air pressure between these devices is 5 kg / cm ² or less. Piping (shown by a broken line in FIG. 1) is provided, and a connection port 7 for cold air extraction, a connection port for intake of retin air 8, a connection port 10 for cooling water extraction, and a connection port 9 for cooling water intake.
It has.

The box D installed on the side of this unit is for accommodating the control panel, and is optionally attached depending on the purpose of use of this unit. Although not shown, the control panel is provided with, for example, control devices for performing inverter control of the air compression expansion device, a temperature controller, a humidity controller, a pressure controller, an air flow controller, a power supply device, and the like.

The cold air supply unit shown in FIG.
The refrigerating capacity is 10 refrigeration tons, the temperature of the cold air taken out from the cold air take-out connection port 7 is -20 ° C, the air volume is 1.5 kg / sec, the height of the casing is 2.4 m, and the depth is The standard size is 1.5m and width 3.5m, and it can be transported by truck.

FIG. 2 is a schematic sectional view of the unit shown in FIG. 1, showing a connection state between devices housed in a casing. The reference numerals in the figure represent the same as those described in FIG. As shown in the figure, the air taken in from the retin air intake connection port 8 enters the air-to-air heat exchanger C via the conduit a, and after leaving the heat exchanger C, enters the compressor 3a via the conduit b. , Enter 3b. From the compressors 3a and 3b, they enter the water-to-air heat exchanger B via the conduit c, then the air-to-air heat exchanger C via the conduit d, and the expander 5 via the conduit e.
To the cold air extraction connection port 7
Be led to. Of these pipelines a to f, the ones with the highest pressure are pipelines c, d and e from the compressor 3 to the expander 5, but in the case of this unit, the maximum pressure is about 2 atm. ， These pipelines are also made of resin pipes.
The other pipelines a, b, and f have a pressure of about 1 atm to 1.2 atm and are also made of resin pipes.

Further, as shown in FIG. 2, the integrated air compression / expansion device A is assembled on the substrate 11 via the vibration isolator 12, and the inner surface of the casing 1 is covered with the sound absorbing plate 13. It is stretched. Although not visible in the figure, the casing 1 is provided with an inspection door and a gallery for releasing heat generated in the casing 1.

FIG. 3 is a device layout system diagram for explaining the operation mode of the unit of the present invention, and the reference numerals in the drawing represent the same components as described above. First, referring to FIG. 3, the air compression / expansion device A, which is the heart of the unit of the present invention, will be described. The electric motor 2 is a squirrel-cage three-phase induction motor, and its shaft power is transmitted via the gear box 4. It is transmitted to the compressor 3.

Two turbo compressors are used as the compressor 3, and power is transmitted to each of the compressors 3a and 3b through a gear box 4. In the illustrated example, the shaft power of the electric motor 2 and the expander 5 are applied to the compressors 3a and 3b via the gear box 4.
The rotational power of is transmitted. That is,
The compressors 3a and 3b function as a power recovery machine. In the gear box 4, the speed of rotation of the expander 5 is changed and the compressor 3
A transmission for transmitting to a and 3b is installed, and power can be recovered most efficiently by selecting the gear ratio.
The expander 5 is a turbine type.

In the illustrated embodiment, the compressors 3a and 3b are used.
Although those arranged in parallel via the gear box 4 are used, they are not necessarily connected in parallel. In an extreme example, one compressor may be configured to perform 100% compression function. At that time, it is preferable that power can be recovered from the expander. The compressor and the expander are not limited to the turbo type and the turbine type shown in the figure, and those conventionally known as an air compressor / expander, for example, a screw type can also be used. In any case, the unit of the present invention uses a combination of the electric motor 2, the compressor 3, the gear box 4, and the expander 5 as one device.

As the water-to-air heat exchanger B, a normal fin tube type heat exchanger is used, and cooling water is passed to the tube side.

As the air-to-air heat exchanger C, a cross flow type using a resin material as a heat transfer plate is used. That is,
As shown in FIG. 4, the resin corrugated plates 14 and 15 are alternately laminated so that their wavy lines are orthogonal to each other, and a partition plate 16 is interposed between the corrugated plates. A large number of air passages 17 and 18 that are orthogonal to each other are formed. By allowing two systems of air to flow into the air passages 17 and 18 that are orthogonal to each other, heat can be efficiently exchanged without being mixed with each other. The structure itself of such a block type air-to-air heat exchanger is well known, and in the unit of the present invention, the heat exchange material does not necessarily have to be made of metal, and a resin made one can also be used. it can. Further, the heat exchange may not necessarily be the cross flow type, but the heat exchange may be performed in a counterflow type or a gradient flow type.

In the unit of the present invention, the operation of this air-to-air heat exchanger C is extremely important. That is, when the cold air sent from the unit of the present invention to the facility load 20 (FIG. 3) such as ice making returns to the unit via the load 20, the return air is generally higher than the outside air temperature. It is cold. Therefore, cold air can be efficiently produced by exchanging heat between the return air and the high-pressure air before entering the expander 5 by the air-to-air heat exchanger C.

In the case of the unit of the present invention having a cooling capacity of 10 refrigeration tons, when the outside air temperature is 30 ° C., the temperature of cold air taken out from this unit is −20 ° C., and the air volume is 1.5 kg /.
Table 1 shows an example of the temperature condition processed by each device at sec. However, the return air temperature returned from the load side shall be 5 ° C.

[0029]

[0030]

The packaged cold air supply unit of the present invention can be manufactured in a factory.
If this unit is transported to a site where ice making is required, for example, a temporary skating rink or a bobsled competition course and operated, cold air below 0 ° C can be freely taken out at that site, and it can be easily used to make ice. You can

Further, even in various refrigerating and refrigerating facilities, a desired refrigerating atmosphere can be easily formed by installing and operating the unit of the present invention.

Since the unit of the present invention uses air as the refrigerant, there is no problem of environmental pollution due to leakage. Therefore, it has the feature that it does not require perfect piping. For this reason, no ordinary person is required for handling work and installation and connection work at the site, and ordinary field workers can perform the work. Moreover, the connection work with the load side only requires air piping, cooling water connection, and power supply connection, and is easy to operate. Since it can be installed at any time, it has a good connection depending on the site.

From the above, the unit of the present invention can greatly contribute to the popularization of a new cooling and refrigerating facility using air in the field where the chiller-using refrigerator is used in the ice making and freezing / refrigerating facilities. it can.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a packaged cold air supply unit according to the present invention.

2 is a schematic cross-sectional view of the unit of FIG.

FIG. 3 is a device arrangement system diagram for explaining an operating mode of the unit of the present invention.

FIG. 4 is a perspective view showing the principle of an air-to-air heat exchanger used in the unit of the present invention.

[Explanation of symbols]

 1 Casing 2 Electric Motor 3 Compressor 4 Gear Box 5 Expander 6 Bottom Plate 7 Supply Air Outlet Connection Port 8 Retan Air Intake Connection Port 9 Cooling Water Intake Connection Port 10 Cooling Water Outlet Connection Port 11 Air Compressor Expansion Board 12 Vibration proof plate 13 Sound absorbing plate A Air compression / expansion device B Water-to-air heat exchanger C Air-to-air heat exchanger D Control box

Claims (6)

[Claims] 1. An air compression / expansion device that integrally combines an electric motor, an air compressor, and an air expander, a water-to-air heat exchanger, and an air-to-air heat exchanger are housed in a single casing. However, air pipes with an air pressure of 5 kg / cm ² or less are provided between these devices in the casing, and a connection port for taking out cold air, a connection port for taking in retin air, a connection port for taking out cooling water and a connection for taking in cooling water are provided. Movable cold air supply unit with mouth. 2. The air compression / expansion device includes two compressors, both of which are installed so that the power of the electric motor and the power of the expander are transmitted through a gear box. Cold Air Supply Unit. 3. The air pipe is made of a resin pipe, and the air pressure in the air pipe is controlled to 3 kg / cm ² or less.
Or the cold air supply unit described in 2. 4. The air compression / expansion device integrated product is installed on a bottom plate in a casing, and the water-to-air heat exchanger and the air-to-air heat exchanger are installed in an upper space in the casing. The cold air supply unit described in 2 or 3. 5. A dehumidifier is connected to the outside of the casing,
The cold air supply unit according to claim 1, 2, 3 or 4, wherein air is piped so that air before entering the air compressor passes through the dehumidifier. 6. The cold air supply unit according to claim 1, 2, 3, 4, or 5, wherein a control panel is installed outside the casing.