JP2000205731A - Cooling system employing brine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a cooling system employing brine in which running cost of defrosting operation can be reduced and initial cost can also be reduced by making convenient the circuitry. SOLUTION: A brine cooling system 10 for cooling a plurality of showcases 13A, 13B, 13C,... comprises a brine chiller unit 14 for cooling brine, a primary circuit 11 having a primary pump 21 for circulating brine from the brine chiller unit, secondary circuits 12A, 12B, 12C,... having coolers 22 built in respective showcases, a secondary supply path 23 for supplying brine from the primary circuit to the cooler and a secondary return path 24 for returning brine from the cooler to the primary circuit, a secondary pump 30 arranged in the secondary return path of the secondary circuit, first solenoid valve 31 arranged in the secondary return path on the downstream side of the secondary pump, and a bypass circuit 29 branched from the secondary return path between the secondary pump and the first solenoid valve and connected with the secondary supply path while being provided with second solenoid valve 32 and a defrosting heat exchanger 33.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a cooling system using brine for cooling foods and the like in a plurality of showcases in a supermarket or the like.

[0002]

2. Description of the Related Art Conventionally, as a method of cooling a showcase in a supermarket or the like, a direct expansion type in which a cooler in a showcase is directly cooled by using Freon refrigerant or the like has been mainly used. The adverse effect on the environment has become a problem, and the demand for CFC reduction from the market is increasing. HACCAP management (computer-assisted temperature management) to further prevent food poisoning
Demands for high freshness management are increasing. As one of the devices meeting such a demand, a cooling system using brine (antifreeze) has been proposed.
In addition, as a brine (antifreeze), a mixture of propylene glycol, ethylene glycol, ethanol, or the like and water can be used.

Next, an example in which a cooling system using brine is used to cool a plurality of showcases in a supermarket will be described. A primary circuit including an outgoing path and a return path is connected to the brilliance unit, and a secondary circuit including a cooler of the showcase is branched in parallel from the primary circuit for each showcase. The supply of brine to the secondary circuit of each showcase is performed by a pump provided on the primary circuit side, and the temperature of each showcase is controlled by ON / OFF control of a solenoid valve provided in the showcase. This is achieved by adjusting the flow rate of brine flowing through the circuit.

[0004]

By the way, in the cooling system using the conventional brine as described above, the defrosting operation of the cooler in each showcase is performed by turning on the defrost heater installed near the cooler. It is implemented by operating.

However, when the defrosting operation is performed only by the ON operation of the defrosting heater, it is necessary to set the capacity of the defrosting heater large, so that the electricity cost increases and the running cost during the defrosting operation increases. I will.

SUMMARY OF THE INVENTION An object of the present invention has been made in view of the above-mentioned circumstances, and is intended to use a brine that can reduce the running cost during the defrosting operation, and can simplify the circuit configuration and reduce the initial cost of the cooling system. To provide an improved cooling system.

[0007]

According to a first aspect of the present invention, there is provided a cooling system using a brine for cooling a plurality of showcases using the brine. A primary circuit configured with a pump and configured to circulate brine from the brush chiller unit, a cooler built in each showcase, a secondary circuit that takes in brine from the primary circuit and flows the cooler to the cooler An outward path, and a secondary return path for returning brine from the cooler to the primary circuit,
A secondary circuit provided for each showcase; a secondary pump disposed in the secondary return path of the secondary circuit to flow brine in the secondary circuit; and a secondary pump of the secondary circuit. A first electromagnetic valve disposed downstream of the secondary pump in the next return path, and a branch from the secondary pump and the first electromagnetic valve in the secondary return path of the secondary circuit, And a bypass circuit connected to the secondary outward path of the next circuit and having a second solenoid valve and a defrosting heat exchanger sequentially from the upstream side.

According to a second aspect of the present invention, there is provided a cooling system using a brine for cooling a plurality of showcases using the brine, the closed system including a brine chiller unit for cooling the brine, and a primary pump. A primary circuit that circulates the brine from the brush chiller unit, a cooler built in each of the showcases, a secondary outward path that takes in the brine from the primary circuit and flows it to the cooler, and the cooler From the secondary circuit to return the brine to the primary circuit from the secondary circuit provided for each showcase, the secondary circuit is disposed in the secondary forward path of the secondary circuit, the brine in the secondary circuit And a first solenoid valve disposed in the secondary return path of the secondary circuit, and a first solenoid valve in the secondary return path of the secondary circuit. And a bypass circuit connected to the secondary pump upstream side of the secondary circuit in the secondary circuit of the secondary circuit and having a second solenoid valve and a defrosting heat exchanger sequentially from the upstream side. It is characterized by the following.

According to a third aspect of the present invention, in the first or second aspect, the defrosting heat exchanger is installed on a top surface of a showcase.

[0010] The invention described in claim 4 is the first to third aspects of the present invention.
In the invention according to any one of the above, a three-way valve capable of communicating with a cooler side, a defrosting heat exchanger side, and a primary circuit side is provided at a branch portion of the secondary return path and the bypass circuit in the secondary circuit. The first and second solenoid valves are installed in place of the first and second solenoid valves.

[0011] The invention according to claim 5 provides the invention according to claims 1 to 4.
In the invention described in any one of the above, the secondary circuits provided for each of the showcases are connected in parallel, and in these showcases, any one of the normal cooling operation and the defrosting operation can be performed. It is characterized by being comprised in.

The first aspect of the invention has the following operation.

In the defrosting operation for the cooler of each secondary circuit, the first solenoid valve is closed and the second solenoid valve is opened,
Activate the secondary pump and circulate brine between the downstream part of the secondary outward path, the cooler, the upstream part of the secondary return path, and the bypass circuit, and during this time, the temperature of the brine with the heat exchanger for defrosting Since the temperature is raised in the defrosting heat exchanger and the brine circulated as described above also performs defrosting of the cooler, only the operation of the defrosting heater disposed near the cooler is performed. The capacity of the defrost heater can be reduced as compared with the case where the defrost of the cooler is performed, and as a result, the running cost during the defrost operation can be reduced.

During the normal cooling operation of the showcase, the first solenoid valve is opened, the second solenoid valve is closed, the secondary pump is started, and the brine is cooled from the primary circuit to the secondary circuit. During defrosting operation of the cooler,
Since the first solenoid valve is closed and the second solenoid valve is opened, the secondary pump is started and the brine is circulated as described above, so that the secondary pump can be used as both a cooling pump and a defrosting pump. . Therefore, the configurations of the secondary circuit and the bypass circuit can be simplified, and the initial cost of the cooling system can be reduced.

Further, the secondary pump is a secondary return path of a secondary circuit,
That is, since the secondary pump is installed on the high-temperature side of the cooler, the secondary pump pumps high-temperature, low-viscosity brine, thereby improving pump efficiency.

The second aspect of the present invention has the following operation.

In the defrosting operation for the cooler of each showcase, the first solenoid valve is closed, the second solenoid valve is opened, the secondary pump is started, and the downstream portion of the secondary forward path is connected to the cooler. The brine is circulated between the upstream portion of the secondary return path and the bypass circuit, and during this time, the temperature of the brine is increased by the heat exchanger for defrosting. Since the defrost of the cooler is also performed by the brine circulated as described above, the capacity of the defrost heater is reduced as compared with the case where the defrost of the cooler is performed only by the operation of the defrost heater arranged near the cooler. As a result, the running cost during the defrosting operation can be reduced.

In the normal cooling operation of the showcase, the first solenoid valve is opened, the second solenoid valve is closed, the secondary pump is started, and the brine is transferred from the primary circuit to the cooler of the showcase. During the defrosting operation of the cooler, the first solenoid valve is closed, the second solenoid valve is opened, and the secondary pump is started to circulate the brine as described above. Can be used as both a cooling pump and a defrosting pump. Therefore, the configurations of the secondary circuit and the bypass circuit can be simplified, and the initial cost of the cooling system can be reduced.

The third aspect of the invention has the following operation.

Since the defrosting heat exchanger is installed on the top of the showcase, the air that has been heat-exchanged with the brine in the defrosting heat exchanger flows near the top of the showcase. It is possible to prevent the occurrence of discomfort before hitting the person facing the case.

The invention described in claim 4 has the following operation.

At the branch of the secondary return path and the bypass circuit in the secondary circuit, a three-way valve that can communicate with the cooler, the defrosting heat exchanger, and the primary circuit, respectively, is provided with a first solenoid valve and a third solenoid valve. The control circuit for controlling the three-way valve can be simplified as compared with the case where the first solenoid valve and the second solenoid valve are used, because the two solenoid valves are installed instead.

The invention described in claim 5 has the following operation.

The secondary circuits provided for each showcase are connected in parallel, and in these showcases, any one of the normal cooling operation and the defrosting operation can be performed. In this showcase, the secondary pump, the defrosting heat exchanger, the first solenoid valve and the second solenoid valve (three-way valve) can be shared, so these secondary pump, defrosting heat exchanger, first solenoid valve In addition, the number of second solenoid valves (three-way valves) can be reduced, and the initial cost of the cooling system can be reduced.

[0025]

Embodiments of the present invention will be described below with reference to the drawings.

[A] First Embodiment (FIGS. 1 to 4) FIG. 1 shows an overall configuration of a brine cooling system which is a first embodiment of a cooling system using brine according to the present invention. It is a circuit diagram.

The brine cooling system 10 shown in FIG.
Is a plurality of showcases 13A, 1
3B, 13C,... Are cooled. The brine cooling system 10 includes a brine chiller unit 14,
Primary circuit 11, secondary circuits 12A, 12B, 12C
-It is comprised including the secondary pump 30, the 1st electromagnetic valve 31, and the bypass circuit 29, and the bypass circuit 29 is provided with the 2nd electromagnetic valve 32 and the heat exchanger 33 for defrost.

The brush chiller unit 14 includes a refrigerating cycle having a compressor 15, a condenser 16, a pressure reducing mechanism 17, and an evaporator 18, and the refrigerant circulates in the refrigerating cycle. The primary circuit 11 is connected to the evaporator 18, and the evaporator 18 cools the below-described brine flowing in the primary circuit 11.

The primary circuit 11 has a primary forward path 19 for supplying brine from the blincher unit 14.
And a primary return path 20 for collecting the brine into the blusher unit 14 to form a closed circuit. Further, the primary return path 20 of the primary circuit 11 includes:
A primary pump 21 that is always started is provided. By the activation of the primary pump 21, the brine is circulated in the primary circuit 11.

The above secondary circuits 12A, 12B, 12C,.
・ A plurality of showcases 13A, 13B, 13C
..Coolers 22, secondary outgoing paths 23 provided for each
And a secondary return path 24.

The cooler 22 is provided with each of the showcases 13A, 1
In 3B, 13C,..., The cool air passage 25 shown in FIG.
It is arranged in. The cooler 22 is also provided with the cool air passage 2
The air flowing through the cool air passage 25 is cooled by the action of the blower 26 disposed in the cooling air 5 to form cooling air. The cooling air is supplied from the outlet 27 of the cool air passage 25 to each of the showcases 13.
A, 13B, 13C ... flows out to cool foods and the like. Reference numeral 28 is a suction port of the cool air passage 25.

As shown in FIG. 1, the secondary outward path 23 includes a primary return path 20 or a primary outward path 19 of the primary circuit 11 and the cooler 2.
2 are connected together to take in brine from the primary circuit 11 and allow it to be introduced into the cooler 22. Further, the secondary return path 24 is connected to the primary return path 20 or the primary outward path 19 of the primary circuit 11 and the cooler 22 so that the brine from the cooler 22 can be led out to the primary circuit 11. In the present embodiment, the second forward path 2 of the showcases 13A and 13B
The secondary return path 3 and the secondary return path 24 are connected to the primary return path 20 of the primary circuit 11, and the secondary forward path 23 and the secondary return path 24 of the showcase 13C are connected to the primary forward path 19 of the primary circuit 11.

The secondary pump 30 is connected to each of the secondary circuits 12
A, 12B, 12C,... Are disposed on the secondary return paths 24, and the respective secondary circuits 12A, 12B, 12C,.
Allow the brine to flow within. The brine flowing in the secondary return path 24 is in a high temperature state due to heat exchange in the cooler 22 and has a lower viscosity than the brine flowing in the secondary outward path 23. Accordingly, the secondary pump 30 pumps and flows the low-viscosity brine.

The first solenoid valve 31 is connected to each of the secondary circuits 12
A, 12B, 12C,... Are disposed downstream of the secondary pump 30 in the secondary return path 24. By the opening operation of the first electromagnetic valve 31 and the closing operation of the second electromagnetic valve 32, the brine exchanged in the cooler 22 is returned to the primary circuit 11 by the operation of the secondary pump 30.

The bypass circuit 29 has one end branched from between the secondary pump 30 and the first solenoid valve 31 in the secondary return path 24 of each of the secondary circuits 12A, 12B, 12C. Are the secondary circuits 12A, 12B, 12C,.
-The secondary outgoing path 23 is connected. Further, the bypass circuit 29 has an upstream side (that is, a side close to the secondary pump 30).
The second solenoid valve 32 and the defrosting heat exchanger 33 are sequentially connected from the downstream to the downstream side (that is, the side far from the secondary pump 30).

The opening operation of the second solenoid valve 32 and the first solenoid valve 31
, The brine that has been heat-exchanged in the cooler 22 is guided to the defrosting heat exchanger 33 by the action of the secondary pump 30. At this time, the downstream portion of the secondary outward path 23 and the cooler 2
2 and the upstream portion of the secondary return path 24 and the bypass circuit 29 constitute a defrosting closed circuit 37, and the brine circulates in the defrosting closed circuit 37.

The defrosting heat exchanger 33 exchanges heat between the outside air A and the brine taken into the defrosting heat exchanger 33 by the action of the fan 34 installed in the vicinity, and raises the temperature of the brine. These defrosting heat exchangers 33 and fans 34 are connected to the respective showcases 13A, 13B, 13C
.. The outside air A from the fan 34 is installed on the top surface 35 of each of the showcases 13A, 13B, 13C.
It is considered not to be sprayed on people who face ...

Reference numeral 38 in FIG. 2 denotes a drain pipe for flowing down water droplets generated on the heat exchanger 33 for defrosting. Reference numeral 36 denotes each showcase 13A, 1
3B, 13C, etc. are heaters for defrosting that are installed near the coolers 22 and are turned ON during the defrosting operation of the brine cooling system 10 to execute defrosting of the coolers 22.
During the defrosting operation of the brine cooling system 10, the temperature of the brine circulating through the closed circuit for defrosting 37 (FIG. 2) and the temperature of O
The cooler 22 is defrosted by the heating temperature of the defrosting heater 36 that has operated N times.

Next, the normal cooling operation and the defrosting operation of the brine cooling system 10 will be described.

Here, the normal cooling operation is a thermocycle operation in which the thermo-ON mode and the thermo-OFF mode are repeated, and the flow of the brine at this time (particularly in the thermo-ON mode) is shown by a thick line in FIG. The defrosting operation is an operation for removing frost adhering to the coolers 22 of the secondary circuits 12A, 12B, 12C,..., And the flow of brine at this time is indicated by a thick line in FIG.

(1) Normal cooling operation (FIGS. 1 and 2) First, in the thermo-ON mode, the brush chiller unit 1
4 and the primary pump 21 are started to circulate the brine in the primary circuit 11 and the secondary pump 30 is started. It should be noted that the primary pump 21 that has been started up is operated without stopping during the operation of the brine cooling system 10, and in particular, the damage that occurs when the primary pump 21 is started up when the temperature of the brine is lowered is reduced, and the primary pump 2 is operated.
1 improves durability.

In this state, the first solenoid valve 31 is opened,
By operating the second solenoid valve 32 to close, the brine flows from the primary circuit 11 into the secondary outward path 23 of the secondary circuits 12A, 12B, 12C,..., And the brine is guided to the cooler 22. Since this brine is cooled by the brine chiller unit 14, the air flowing through the cool air passage 25 is cooled by the cooler 22, and the showcases 13A, 13B, 13C
..Cooling, for example, foods inside. The brine that has flowed through the cooler 22 is recovered by the primary circuit 11 via the secondary return path 24, returned to the brush chiller unit 14, and cooled again.

Here, in the secondary circuits 12A and 12B, the brine is taken in from the primary return path 20 of the primary circuit 11 and returned to the primary return path 20 in the same manner. In the secondary circuit 12C, the brine is taken in from the primary forward path 19 of the primary circuit 11 and returned to the primary forward path 19 in the same manner.

The above-mentioned thermo-ON mode is the ON of the secondary pump 30, the ON of the first solenoid valve 31, the OFF of the second solenoid valve 32 and the defrost heater 36 in FIG. "A" which is reduced to

Next, in the thermo OFF mode, both the first solenoid valve 31 and the second solenoid valve 32 are closed, and the secondary pump 30 is stopped. Thereby, the brine is changed from the primary circuit 11 to the secondary circuits 12A, 12B, 12C,.
To each showcase 13A, 13B,
The temperature in 13C ... rises.

In the thermo OFF mode, the secondary pump 30 is turned OFF, the first solenoid valve 31 is turned ON, the second solenoid valve 32 and the defrost heater 36 are turned OFF in FIG. It corresponds to the portion of “b” that rises.

(2) Defrosting Operation (FIGS. 1 and 3) In the defrosting operation, the defrosting heater 36 is turned on, the first solenoid valve 31 is closed, and the second solenoid valve 32 is opened. The next pump 30 and the fan 34 are started. Thus, the downstream portion of the secondary outward path 23 and the cooler 2
A defrosting closed circuit 37 is formed between the upstream side of the secondary return path 24 and the bypass circuit 29, and the brine circulates in the defrosting closed circuit 37. While circulating in the closed circuit 37 for defrost, the brine exchanges heat with the outside air A by the action of the fan 34 in the heat exchanger 33 for defrost, and the temperature rises. The heated brine flows through the inside of the cooler 22, and the cooler 22 is further heated by the defrost heater 36, so that the cooler 22 is defrosted.

In FIG. 4, the defrosting operation is performed by turning on the secondary pump 30, turning off the first solenoid valve 31, and turning on the second solenoid valve 32.
And the defrosting heater 36 is ON, and corresponds to a portion “c” where the temperature inside the showcase storage box rapidly rises.

Therefore, according to the brine cooling system 10 of the above embodiment, the following effects are obtained.

Each showcase 13A, 13B, 13C
When the defrosting operation is performed on the cooler 22 installed in ..., the first electromagnetic valve 31 is closed, the second electromagnetic valve 32 is opened, the secondary pump 30 is started, and the secondary circuit 12A,
In 12B, 12C,..., The brine is circulated in the defrosting closed circuit 37 including the downstream portion of the secondary forward path 23, the cooler 22, the upstream portion of the secondary return path 24, and the bypass circuit 29, During this time, since the temperature of the brine is raised by the defrosting heat exchanger 33, the cooler 22 is also defrosted by the brine which is heated by the defrosting heat exchanger 33 and circulates through the defrosting closed circuit 37. O of the heater 36 for defrosting installed near the cooler 22
The capacity of the defrost heater 36 can be reduced as compared with the case where the defrost of the cooler 22 is performed only by the N operation, and as a result, the running cost during the defrost operation can be reduced.

Each of the showcases 13A, 13B, 13C
During the normal cooling operation, the first solenoid valve 31 is opened, the second solenoid valve 32 is closed, the secondary pump 30 is started, and the brine is discharged from the primary circuit 11 to the secondary circuit 12A.
.. To the coolers 22 of 12B, 12C... Also, at the time of the defrosting operation of the coolers 22, the first solenoid valve 31 is closed, the second solenoid valve 32 is opened, and the secondary pump 30 is started. Since the brine is circulated in the defrosting closed circuit 37, the secondary pump 30 can be used as both a cooling pump and a defrosting pump. For this reason, the secondary circuits 12A, 12A
, And the configuration of the bypass circuit 29 can be simplified, and the initial cost of the brine cooling system 10 can be reduced.

The secondary pump 30 is connected to the secondary circuits 12A and 12A.
Since the secondary pump 24 of B, 12C... Is installed on the high-temperature side of the cooler 22, the secondary pump 30 pumps high-temperature, low-viscosity brine to improve pump efficiency. Can be.

The heat exchanger 33 for defrosting is the showcase 1
Since it was installed on the top of 3A, 13B, 13C,
Since the outside air A heat-exchanged with the brine in the defrosting heat exchanger 33 flows near the top surface 35 of the showcases 13A, 13B, 13C,...
3A, 13B, 13C ...
Discomfort can be prevented from occurring. [B] Second Embodiment (FIGS. 1 and 2) In the brine cooling system 40 of the second embodiment, in each of the secondary circuits 12A, 12B, 12C,. Instead of the next pump 30, it is arranged in the secondary outward path 23 as shown in FIG. As in the brine cooling system 10, the first solenoid valve 31 is disposed in the secondary return path 24, and the second solenoid valve 32 is connected to the bypass circuit 29.
It is arranged in. This bypass circuit 29 is connected to the secondary return path 24.
Is branched from the upstream side of the first electromagnetic valve 31 and connected to the upstream side of the secondary pump 42 in the secondary forward path 23.

In the brine cooling system 40, the same parts as those of the brine cooling system 10 are denoted by the same reference numerals, and the description will be omitted.

With the above-described circuit configuration, in the thermo-ON mode during the normal cooling operation, the primary circuit 11 is opened by starting the secondary pump 42, opening the first solenoid valve 31, and closing the second solenoid valve 32. Secondary circuits 12A, 12B, 12C
... the brine is taken in, and the brine is guided to the cooler 22, and the showcases 13A, 13B, 13
Cool the interior of C ... In the thermo-OFF mode during the normal cooling operation, the secondary circuit 42 is stopped, and the first solenoid valve 31 and the second solenoid valve 32 are closed, so that the primary circuit 11 changes to the secondary circuits 12A, 12B, 12C,. Brine did not flow into the inside, and showcases 13A, 13B, 1
The temperature inside the chamber in 3C ... rises.

Further, during the defrosting operation, the first solenoid valve 31
, And the opening operation of the second solenoid valve 32, the downstream part of the secondary forward path 23, the cooler 22, the upstream part of the secondary return path 24, and the bypass circuit 29, and the defrosting closing circuit 43.
Is configured. Then, by starting the secondary pump 42,
The brine circulates through the defrosting closed circuit 43, and during this time, the brine that is heated by the defrosting heat exchanger 33 and heating from the defrosting heater 36 perform defrosting of the cooler 22.

In the brine cooling system 40 according to the second embodiment, since the position of the secondary pump 42 is different from that of the brine cooling system 10, the same effects as those of the first embodiment can be obtained.

[C] Third Embodiment (FIGS. 1 and 5) FIG. 5 shows a secondary circuit of a brine cooling system which is a third embodiment of a cooling system using brine according to the present invention. FIG. In the third embodiment, the same parts as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

In the brine cooling system 50 according to the third embodiment, each of the secondary circuits 12A, 12B, 12C,.
In (2), a three-way valve 51 is installed at the branch of the bypass circuit 29 in the secondary return path 24 in place of the first solenoid valve 31 and the second solenoid valve 32. In the three-way valve 51, each of the three ports is connected to the cooler 22 (the secondary pump 30).
Side), the defrosting heat exchanger 33 side, and the primary circuit 11 side.

The three-way valve 51 is connected to the port on the side of the cooler 22 (the side of the secondary pump 30) and the primary circuit 11 during the thermo-ON mode in the normal cooling operation of the brine cooling system 10.
Communication with the side port and the brine cooling system 10
At the time of defrosting operation of the cooler 22 (secondary pump 30 side)
The port and the port on the side of the defrosting heat exchanger 33 are communicated. In the thermo-OFF mode in the normal cooling operation of the brine cooling system 10, the cooler 22 (secondary pump 30 side), the defrosting heat exchanger 33 side, and the primary circuit 11 side are cut off.

Therefore, in the brine cooling system 50, the brine cooling system 10 of the above embodiment is also used.
In addition to the effects similar to the above, the following effects are obtained.

The secondary circuits 12A, 12B, 12C,...
The three-way valve 51 that can communicate with the cooler 22 side, the defrosting heat exchanger 33 side, and the primary circuit 11 side at the branch portion between the secondary return path 24 and the bypass circuit 29 in the first electromagnetic valve 31 and Since the second solenoid valve 32 is provided instead of the second solenoid valve 32, the control circuit for controlling the three-way valve 51 can be simplified as compared with the case where the first solenoid valve 31 and the second solenoid valve 32 are used.

[D] Fourth Embodiment (FIG. 6) FIG. 6 is a circuit diagram showing an overall configuration of a brine cooling circuit which is a fourth embodiment of a cooling system using brine according to the present invention. . In the fourth embodiment, the same parts as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

In the brine cooling system 60 according to the fourth embodiment, the secondary circuit 12A of the showcase 13A
And the secondary circuit 12B of the showcase 13B are connected in parallel, and the secondary circuit 12C of the showcase 13C, the showcase 13D, and the secondary circuit 12D are connected in parallel. That is, the secondary forward paths 23 of the secondary circuits 12A and 12B are connected downstream of the connection point of the bypass circuit 29, and the secondary return paths 24 of the secondary circuits 12A and 12B are connected to the secondary pump 30. Is connected on the upstream side. Also,
The secondary forward paths 23 and the secondary return paths 24 of the secondary circuits 12C and 12D are also connected in the same manner as the secondary circuits 12A and 12B.

With the above-described circuit configuration, the secondary circuit 12A and the secondary circuit 12B perform one of the normal cooling operation and the defrosting operation, and perform the same operation.
Similarly, the secondary circuit 12D performs one of the normal cooling operation and the defrosting operation.

Therefore, the brine cooling system 60 has the same effects as those of the brine cooling system 10 and the following effects.

The secondary circuit 12A of the showcase 13A and the secondary circuit 12B of the showcase 13B are connected in parallel, and the secondary circuit 12C of the showcase 13C and the secondary circuit 12D of the showcase 13D are connected in parallel. In these showcases 13A, 13B, 13C, the normal cooling operation and the defrosting operation can be simultaneously performed in the secondary circuits 12C and 12D in the secondary circuits 12A and 12B, respectively. , The showcase 13A, the showcase 13D, and the showcase 13
In each of C and the showcase 13D, the secondary pump 30, the first solenoid valve 31, the second solenoid valve 32, and the defrosting heat exchanger 33 can be shared. Therefore, the number of the secondary pump 30, the first solenoid valve 31, the second solenoid valve 32, and the defrosting heat exchanger 33 can be reduced, and the initial cost of the brine cooling system 60 can be reduced.

Although the present invention has been described based on the above embodiment, the present invention is not limited to this.

For example, in the brine cooling systems 10, 40, 50, and 60 of each of the above embodiments, each of the secondary circuits 12A, 12A, 12
Are connected to the primary return path 20 or the primary return path 19 of the primary circuit 11 (for example, the secondary return path 23 and the secondary return path 24 of the secondary circuit 12A are connected to the primary circuit). 11, the secondary circuit 12C
1 is connected to the primary outgoing path 19 of the primary circuit 11).
, The secondary circuits 12A, 12B, 1
The secondary outward path 23 of 2C ... is the primary outward path 1 of the primary circuit 11.
9, a secondary return path 24 may be connected to the primary return path 20, respectively.

Further, in the brine cooling system 60 of the fourth embodiment, in addition to the secondary circuit 12B in the secondary circuit 12A, a plurality of secondary circuits are provided in the secondary circuit 12C in addition to the secondary circuit 12D. , A plurality of secondary circuits may be connected in parallel.

[0071]

As described above, according to the cooling system using the brine according to the first aspect of the present invention, a closed circuit is provided with the brine chiller unit for cooling the brine and the primary pump. A primary circuit that circulates brine from the brine chiller unit, a cooler built into each of the showcases, a secondary forward path that takes brine from the primary circuit and flows it to the cooler, and a primary circuit that draws brine from the cooler. A secondary circuit provided for each showcase, and a secondary pump disposed in the secondary return path of the secondary circuit to flow brine in the secondary circuit. A first solenoid valve disposed downstream of the secondary pump in the secondary return path of the secondary circuit, the secondary pump and the first solenoid valve in the secondary return path of the secondary circuit Branched from between the magnetic valve, and connected to the secondary outward path of the secondary circuit, the second solenoid valve, a defrosting heat exchanger and a bypass circuit sequentially provided from the upstream side, The running cost during the defrosting operation can be reduced, and the initial cost of the cooling system can be reduced by simplifying the circuit configuration.

According to the cooling system using brine according to the second aspect of the present invention, the primary circuit is configured in a closed circuit with a primary pump, and circulates the brine from the brush chiller unit; It has a cooler built in the case, a secondary forward path that takes in brine from the primary circuit and flows it to the cooler, and a secondary return path that returns brine from the cooler to the primary circuit, and is provided for each showcase. And a secondary pump disposed in the secondary outward path of the secondary circuit and for flowing brine in the secondary circuit, and disposed in the secondary return path of the secondary circuit. A first solenoid valve, which is branched from the upstream side of the first solenoid valve in the secondary return path of the secondary circuit and connected to the secondary pump upstream side in the secondary outward path of the secondary circuit, No. Solenoid valve, a bypass circuit sequentially with a for defrosting the heat exchanger from the upstream side, since it has, it is possible to reduce the running cost during the defrosting operation can be reduced initial cost of the cooling system by simplifying the circuit configuration.

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing an overall configuration of a brine cooling system which is a first embodiment of a cooling system using brine according to the present invention.

FIG. 2 is a pipeline diagram showing a secondary circuit of FIG. 1 and showing a flow of brine during a normal cooling operation.

FIG. 3 is a pipeline diagram showing a secondary circuit of FIG. 1 and showing a flow of brine during a defrosting operation.

FIG. 4 is a graph showing the relationship between the operation of a solenoid valve, a secondary pump, and the like, and the temperature inside the showcase compartment.

FIG. 5 is a pipeline diagram showing a secondary circuit of a brine cooling system which is a third embodiment of the cooling system using brine according to the present invention.

FIG. 6 is a circuit diagram showing an overall configuration of a brine cooling system according to a fourth embodiment of the cooling system using brine according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Brine cooling system 11 Primary circuit 12A, 12B, 12C ... Secondary circuit 13A, 13B, 13C ... Showcase 22 Cooler 23 Secondary forward path 24 Secondary return path 29 Bypass circuit 30 Secondary pump 31 First electromagnetic Valve 32 Second solenoid valve 33 Defrosting heat exchanger 36 Defrosting heater 37 Defrosting closed circuit 40 Brine cooling system 42 Secondary pump 50 Brine cooling system 51 Three-way valve 60 Brine cooling system

 ────────────────────────────────────────────────── ─── Continued on the front page F term (reference) 3L045 AA04 BA01 CA02 DA02 EA02 FA02 GA07 HA01 JA01 JA14 PA01 PA05 3L046 AA03 BA09 CA06 DA00 GA01 GB03 HA02 JA12 MA01 MA05

Claims (5)

[Claims] 1. A cooling system using a brine for cooling a plurality of showcases using the brine, the system including a brine chiller unit for cooling the brine, a primary pump, and configured as a closed circuit, A primary circuit that circulates brine from the unit, a cooler built in each of the showcases, a secondary outward path that takes brine from the primary circuit and flows it to the cooler,
And a secondary return path for returning brine from the cooler to the primary circuit, a secondary circuit provided for each showcase, and a secondary return path of the secondary circuit, A secondary pump for flowing brine in the circuit, a first solenoid valve disposed downstream of the secondary pump in the secondary return path of the secondary circuit, and a secondary solenoid in the secondary return path of the secondary circuit. A bypass branched from between the secondary pump and the first solenoid valve, connected to the secondary outward path of the secondary circuit, a second solenoid valve, and a defrosting heat exchanger sequentially provided from the upstream side. And a circuit, the cooling system using brine. 2. A cooling system using a brine for cooling a plurality of showcases using the brine, comprising: a brine chiller unit for cooling the brine; and a closed circuit comprising a primary pump, wherein the brine chiller is provided. A primary circuit that circulates brine from the unit, a cooler built in each of the showcases, a secondary outward path that takes brine from the primary circuit and flows it to the cooler,
And a secondary return path for returning brine from the cooler to the primary circuit, a secondary circuit provided for each showcase, and a secondary circuit disposed on the secondary outward path of the secondary circuit, A secondary pump for flowing brine in the circuit; a first solenoid valve disposed in the secondary return path of the secondary circuit; and an upstream side of the first solenoid valve in the secondary return path of the secondary circuit. And a bypass circuit connected to the secondary pump upstream side of the secondary circuit in the secondary circuit and having a second solenoid valve and a defrosting heat exchanger sequentially from the upstream side. A cooling system using brine. 3. The cooling system using brine according to claim 1, wherein the heat exchanger for defrosting is installed on a top surface of a showcase. 4. A three-way valve communicable with a cooler side, a defrosting heat exchanger side, and a primary circuit side is provided at a branch portion of the secondary return path and the bypass circuit in the secondary circuit. The cooling system using brine according to any one of claims 1 to 3, wherein the cooling system is installed in place of the valve and the second solenoid valve. 5. A secondary circuit provided for each of said showcases is connected in parallel, and in these showcases, any one of a normal cooling operation and a defrosting operation can be performed. 2. The method according to claim 1, wherein
A cooling system using the brine according to any one of claims 1 to 4.