JPH05118726A - Ice melting device for supercooled water manufacturing device - Google Patents

Abstract

PURPOSE:To obtain a supercooled water manufacturing device capable of releasing freezing promptly when a heat exchanger tube of the vavorizer is subjected to freezing. CONSTITUTION:Refrigerant gas compressed by a compressor 1 is introduced into a condenser 3 by way of a refrigerant pipe 2 where the gas is cooled, condensed and liquefied by cooling water flowing in a heat exchanger tube 4. The condenser 3 is installed at a position lower than a vaporizer 7 and a refrigerant gas pipe 21 and a valve 22 are installed between the top of the condenser and the vaporizer 7. A refrigerant liquid tank 23 is separately installed at an elevation higher than the condenser 3 and the bottom of the tank is connected to the condenser 3 by way of a pipe 25 where a valve 24 is installed in the pipeline. The top of the tank and the vaporizer are connected with a refrigerant gas pipeline 26. When excess cooling water is frozen in a heat exchanger tube of a vaporizer and the operation of the device is suspended, the refrigerant liquid is returned to the condenser 3 and the refrigerant liquid is vaporized by means of the cooling water flowing in the heat exchange tubes. The refrigerant gas is supplied to the vaporizer 7 and condensed outside the heat exchange tubes of the vaporizer. The condensation heat melts the ice deposited on the heat exchange tubes of the vaporizer.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deicer for a supercooled water production system.

[0002]

2. Description of the Related Art A conventional supercooled water producing apparatus is constructed as shown in FIG. That is, a high-temperature and high-pressure refrigerant gas such as CFC compressed by the compressor 1 enters the condenser 3 through the refrigerant pipe 2, is cooled by the cooling water flowing in the heat transfer tube 4, and is condensed and liquefied. The refrigerant liquid passes through the refrigerant liquid pipe 5, is decompressed by the refrigerant liquid flow rate control device 6, and then flows into the evaporator 7 which constitutes a subcooler. The low-temperature low-pressure refrigerant liquid 8 takes heat from the cold water flowing in the evaporator heat transfer tube 9 to evaporate to become a low-temperature refrigerant gas, and is sucked into the compressor 1 again through the refrigerant gas pipe 10. Reference numeral 11 is a driving machine for driving the compressor 1.

In the above structure, the cold water flowing into the inlet side water chamber 12 of the evaporator 7 is cooled by the refrigerant liquid 8 outside the heat transfer tube 9 while flowing in the evaporator heat transfer tube 9, and is cooled in the outlet side water chamber. Come out to 13. The range in which the supercooled water can be formed is limited, and the outlet temperature of the supercooled water is about -2 ° C.

[0004]

When supercooled water is produced by a conventional apparatus, the condition (range) under which supercooled water can be stably produced is considerably narrow and freezing is likely to occur in the pipe. In the case of producing the above, freezing in the heat transfer tube 9 is unavoidable due to excessive lowering of the supercooled water outlet temperature. Once frozen in the heat transfer tubes, the freezing spreads rapidly, and in most cases, supercooled water freezes in almost all heat transfer tubes. In this case, there is no choice but to stop the freezer, and since there is no suitable means to thaw the ice in the heat transfer tube, there is only a means to wait for the thaw to spontaneously thaw due to the difference with the outside air temperature. There was a problem that supercooled water could not be produced during this time because it had to wait for a while.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an apparatus for producing supercooled water which can be quickly defrosted when frozen in the evaporator heat transfer tube.

[0006]

DISCLOSURE OF THE INVENTION The present invention relates to a supercooled water production apparatus, in which when the supercooled water freezes in the evaporator heat transfer tubes and the operation of the apparatus is stopped, the refrigerant liquid in the apparatus is transferred to a condenser. Return, the refrigerant liquid is evaporated by the cooling water flowing in the condenser heat transfer tube, the refrigerant gas is supplied to the evaporator to be condensed outside the evaporator heat transfer tube, and the condensation heat of the condensation thaws the evaporator heat transfer tube. It is characterized by performing.

[0007]

When the supercooled water freezes in the evaporator heat transfer tube and the compressor is stopped, the refrigerant liquid in the device is collected in the condenser. The refrigerant liquid collected in this condenser is evaporated by the high-temperature cooling water (20 to 32 ° C.) flowing in the condenser heat transfer tube. This refrigerant gas is supplied to the evaporator, where it is cooled by ice (0 ° C.) in the evaporator heat transfer tube and condensed. The ice in the heat transfer tube is efficiently heated by the heat of condensation of the refrigerant to be thawed. Then, the refrigerant liquid condensed in the evaporator returns to the condenser through the pipe. In this way, the heat possessed by the cooling water can be used to efficiently thaw the ice frozen in the heat transfer tube.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. (First embodiment)

FIG. 1 is a block diagram showing an ice thawing device of a supercooled water producing system according to a first embodiment of the present invention. The high-temperature and high-pressure refrigerant gas such as CFC compressed by the compressor 1 enters the condenser 3 through the refrigerant pipe 2, is cooled by the cooling water flowing in the heat transfer tube 4, and is condensed and liquefied. In this case, the condenser 3 is installed at a position lower than the evaporator 7. A refrigerant gas pipe 21 is provided between the upper part of the condenser 3 and the evaporator 7, and a valve 22 is provided in the pipe.

Further, the refrigerant liquid tank 23 is separately installed at a position higher than the condenser 3, the lower part is connected to the condenser by a pipe 25, and a valve 24 is provided in the pipe. Further, the upper portion of the refrigerant liquid tank 23 and the evaporator 7 are connected by a refrigerant gas pipe 26.

Next, the operation of the above embodiment will be described. While the supercooled water production system is operating normally, the valves 22, 24 are
Are closed and are operating in the same way as in FIG.

When the supercooled water freezes in the heat transfer tube 9 of the evaporator 7 and the compressor 1 is stopped, the refrigerant liquid 8 in the apparatus collects in the condenser 3 located at a position lower than the evaporator 7. Valve 24 at the same time
Is opened to allow the refrigerant liquid stored in the refrigerant liquid tank 23 to flow into the condenser 3 so that the condenser heat transfer tube 4 is immersed in the refrigerant liquid 8 and the valve 22 is opened. Depending on the structure and combination of the evaporator 7 and the condenser 3, the condenser heat transfer tube 4 may be attached to the refrigerant liquid tank 8 without the refrigerant liquid tank 23. In this case, the refrigerant liquid tank 23 is None

The coolant liquid 8 in the condenser 3 is evaporated by the high-temperature cooling water (20 to 32 ° C.) flowing in the condenser heat transfer tube 4. This refrigerant gas is supplied to the pipe 21 and the refrigerant pipe 2,
It flows into the evaporator 7 through the compressor 1 and the refrigerant gas pipe 10. Here, the refrigerant gas is ice (0) in the heat transfer tube 9 of the evaporator 7.
C.) and condense. The ice in the heat transfer tube 9 is efficiently heated by the heat of condensation of the refrigerant to be thawed. The refrigerant liquid condensed in the evaporator 7 returns to the condenser through the pipe 5. In this way, by utilizing the heat of the cooling water, the ice that has frozen in the heat transfer tube 9 of the evaporator 7 can be efficiently thawed by the natural circulation of the refrigerant.

When the compressor 1 is restarted after the defrosting, the condenser 3
A portion of the high-pressure refrigerant liquid that collects at the bottom of the refrigerant flows through the valve 24 into the refrigerant liquid tank 23 whose pressure has decreased to the same pressure (low pressure) as the evaporator 7 through the refrigerant gas pipe 26. When the proper amount of the refrigerant liquid is accumulated in the refrigerant liquid tank 23, the valve 24 is closed. In this way, unnecessary refrigerant is stored in the refrigerant liquid tank 23 during normal operation. (Second embodiment)

FIG. 2 is a block diagram showing a second embodiment of the present invention. In the second embodiment, a refrigerant liquid pool 31 is provided below the condenser 3 in place of the refrigerant liquid tank 23 in the first embodiment. The refrigerant liquid flow control device 6 and the refrigerant pump 32 are connected to the refrigerant liquid pool 31. The refrigerant pump 32 has a discharge end through a pipe 33 and a spray nozzle 34 provided above the heat transfer tube group 4 of the condenser 3.
Is piped to. Others have the same configuration as that of the embodiment of FIG. In the above configuration, while the supercooled water producing apparatus is operating normally, the valve 22 closes and the refrigerant pump 32 stops, and the operating state is the same as in the case of FIG.

When the supercooled water freezes in the heat transfer pipe 9 of the evaporator 7 and the compressor 1 is stopped, the valve 22 is opened and then the refrigerant pump 32 is operated. As a result, the refrigerant liquid in the refrigerant liquid pool 31 is pressurized by the refrigerant pump 32 and is sprayed from the upper part of the tube group 4 of the condenser 3 by the spray nozzle 34 through the pipe 33. Here, the cooling water having a high temperature (20 to 32 ° C. level) flowing in the heat transfer tube 4 evaporates the refrigerant liquid dropping outside the heat transfer tube 4.

The refrigerant gas passes through the pipe 21 and the valve 22, and also flows into the evaporator 7 through the pipe 2, the compressor 1 and the pipe 10. Here, the refrigerant gas is cooled and condensed by ice (0 ° C.) in the heat transfer tube 9 of the evaporator 7. The ice in the heat transfer tube 9 is efficiently heated by the heat of condensation of the refrigerant to thaw it.
The refrigerant liquid condensed in the evaporator 7 returns to the refrigerant liquid pool 31 through the pipe 5. When the thawing is finished, the refrigerant pump 32 is stopped and the valve 22 is closed. In this way, by utilizing the heat of the cooling water, the heat transfer tube 9 of the evaporator 7 is circulated by circulating the refrigerant.
The frozen ice inside can be efficiently thawed.

[0018]

As described in detail above, according to the present invention, when the supercooled water freezes in the evaporator heat transfer tube and the operation of the apparatus is stopped, the refrigerant liquid is returned to the condenser and the heat transfer tube is cooled. Since it is evaporated by the flowing cooling water, the refrigerant gas is supplied to the evaporator and the condensation heat is used to perform the deicing, the defrosting of the evaporator heat transfer tube can be performed quickly.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing a defroster of a supercooled water production system according to a first embodiment of the present invention.

FIG. 2 is a configuration diagram showing an ice thawing device of a supercooled water production system according to a second embodiment of the present invention.

FIG. 3 is a configuration diagram showing a conventional supercooled water producing apparatus.

[Explanation of symbols]

1 ... Compressor, 2 ... Refrigerant piping, 3 ... Condenser, 4 ... Heat transfer tube,
5 ... Refrigerant liquid pipe, 6 ... Refrigerant liquid flow rate control device, 7 ... Evaporator, 8 ... Refrigerant liquid, 9 ... Evaporator heat transfer pipe, 10 ... Refrigerant gas pipe, 12 ... Inlet side water chamber, 13 ... Outlet side water chamber , 21 ... Refrigerant gas pipe, 22, 24 ... Valve, 31 ... Refrigerant liquid pool, 32
… Refrigerant pump.

Claims (1)

[Claims] 1. In the supercooled water production apparatus, when the supercooled water freezes in the evaporator heat transfer tube and the operation of the apparatus is stopped, the refrigerant liquid in the apparatus is returned to the condenser and the inside of the condenser heat transfer tube is changed. The refrigerant liquid is evaporated by the flowing cooling water, the refrigerant gas is supplied to the evaporator to be condensed outside the evaporator heat transfer tube, and the heat of condensation is used to defrost the evaporator heat transfer tube. Defroster for cooling water production equipment.