JPH1123111A - Freezing system and water cooling freezing apparatus for same system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a freezing system capable of adjusting high pressure without depending upon maintenance of an installation side, and further provide water cooling freezing apparatus for the same system. SOLUTION: In cooling water pipings 31, 31 for connecting a water cooling freezing apparatus 1 and a cooling tower 3 both used through a year, there is not provided a water supply valve for adjusting the amount of cooling water to adjust high pressure. In a refrigerant circuit of the water cooling freezing apparatus 1, there is provided a condensation pressure adjustment apparatus with which the high pressure is adjusted. For the condensation pressure adjustment apparatus there is provided a liquid receptor 13 between a water cooling condenser 12 and an expansion mechanism 14, and there is provided a hot gas bypass circuit 20 in which there is interposed a condensation pressure adjustment valve 21 between a discharge gas piping 16 and a circuit 17 extending from the water cooling condenser 12 to the liquid receptor 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigeration system and a water-cooled refrigeration system for the refrigeration system, and more particularly, to a high-pressure control of a refrigeration system using a cooling tower.

[0002]

2. Description of the Related Art Generally, cooling water cooled by a cooling tower is used as cooling water for a water-cooled refrigeration system used throughout the year, such as a refrigerator and an ice maker, in order to reduce a water charge. By the way, in the refrigeration system using the cooling tower, the temperature of the cooling water is not constant throughout the year. For this reason, if the amount of the cooling water is kept constant, the high pressure (that is, the condensing pressure) changes due to the temperature change of the cooling water. For example, the cooling tower capacity is generally selected on the basis of summer environmental conditions, but when a cooling tower is selected in this way,
Cooling water temperature is too low in winter. Further, when the temperature of the cooling water in winter is too low, the high pressure of the water-cooled refrigeration system becomes too low, and the pressure difference between the high pressure and the low pressure becomes less than a predetermined value, and the refrigeration capacity becomes insufficient. So, conventionally,
In a cooling water pipe connecting the water-cooled refrigeration apparatus and the cooling tower, a water supply valve for controlling the amount of cooling water according to the high pressure and adjusting the high pressure to a predetermined value or more has been provided.

[0003]

However, the cooling water circulating between the cooling tower and the water-cooled refrigeration system is open to the atmosphere in the cooling tower. For this reason, when the maintenance of the cooling water such as the management of the strainer attached to the cooling water circulation path is insufficient, dirt is easily mixed in the cooling water circulation path, and the circulating water becomes sludge and the water supply valve is closed. There was a problem of clogging. Further, when silica or the like attached to the cooling water side heat exchange wall surface of the condenser of the water-cooled refrigeration system is removed by a chemical, there is a problem that the removed silica or the like is easily clogged in the water supply valve. If the water supply valve is clogged, the cooling water will not flow, so the water-cooled condenser will not be cooled and the high pressure will rise,
In summer, shortage of refrigeration capacity occurs, or overheating operation due to an increase in high-pressure pressure causes problems such as burning of the compressor.

In order to avoid such a problem, there is a case where the water supply valve is not used at the discretion of the user, but in such a case, the high-pressure pressure decreases due to a decrease in the winter cooling water temperature. , Resulting in insufficient refrigeration capacity. Further, in an ice maker that performs deicing with hot gas or a refrigerator that performs defrosting with hot gas, there has been a problem that the effect of deicing or defrosting is reduced. In addition, the cooling tower is shared with other products such as air conditioners, or installed as a shared facility of the building,
It is usually difficult to control the supply temperature for a particular refrigeration system.

In view of the above, in the prior art, in consideration of the problem inherent in the maintenance on the equipment side, the present invention adjusts the high pressure without depending on such maintenance on the equipment side. An object of the present invention is to provide a refrigeration system and a water-cooled refrigeration system for the refrigeration system.

[0006]

[Means for Solving the Problems]
In order to achieve the above object, according to the first aspect of the present invention, there is provided a refrigeration system in which cooling water of a water-cooled refrigeration apparatus such as a refrigerator and an ice machine used throughout the year is cooled by a cooling tower. In the cooling water pipe connecting the device, without providing a water supply valve that adjusts the cooling water amount and adjusts the high pressure,
A condensing pressure adjusting device is provided in the refrigerant circuit of the water-cooled refrigeration device, and the high pressure is adjusted by the condensing pressure adjusting device.

According to the second aspect of the present invention, a compressor, a water-cooled condenser using cooling tower water as cooling water, an expansion mechanism,
In a water-cooled refrigeration apparatus provided with a refrigerant circuit formed by sequentially connecting evaporators and the like, a liquid receiver is provided between the water-cooled condenser and an expansion mechanism, and a discharge gas pipe and A hot gas bypass circuit provided with a condensing pressure adjusting valve is provided between the water cooling condenser and the circuit from the liquid receiver to the receiver, and the high pressure is adjusted by the condensing pressure adjusting valve.

In the invention according to claim 3, the evaporator is an ice evaporator attached to an ice maker, and a hot gas bypass pipe is connected between the discharge gas pipe and an inlet side pipe of the ice maker evaporator. The water-cooled refrigeration apparatus is configured as an ice maker for removing ice by bypassing hot gas to the ice evaporator. Here, the inlet side pipe of the ice making evaporator refers to a pipe connecting the expansion mechanism and the inlet of the ice making evaporator.

In the invention according to claim 4, the evaporator is an internal cooling evaporator, and a hot gas bypass pipe is connected between the discharge gas pipe and an inlet pipe of the internal cooling evaporator. The water-cooled refrigeration apparatus is configured as a refrigeration apparatus for a refrigerator in which hot gas is bypassed to the in-compartment cooling evaporator to enable defrosting. Here, the inlet-side pipe of the in-compartment cooling evaporator refers to a pipe that connects the expansion mechanism and the inlet of the in-compartment cooling evaporator.

Therefore, in the refrigeration system according to the first aspect, the high pressure (condensing pressure) is adjusted to a certain value or more by the condensing pressure adjusting device provided in the refrigerant circuit. It does not drop abnormally.
In addition, since a water supply valve is not provided in the cooling water circuit as in the conventional case, a fixed amount of cooling water is circulated throughout the year, and the high pressure pressure may abnormally increase in summer due to clogging of the water supply valve. Absent. As described above, in the refrigeration system of the present invention, the low-pressure pressure does not abnormally decrease, and the high-pressure pressure does not abnormally increase.
Burnout of the compressor is prevented.

Further, in the water-cooled refrigeration system according to the second aspect, when the high pressure decreases in winter, the hot gas is bypassed from the discharge gas pipe to the condenser outlet side, and the high pressure decreases. Since the suppression is suppressed, the high pressure is maintained at a certain value or more, and a decrease in the refrigeration capacity is prevented.

In the water-cooled refrigeration system configured as the ice maker according to the third aspect, since the high pressure is maintained at a certain value or more in winter, deicing of the ice maker by hot gas is always performed. Done effectively.

[0013] In the water-cooled refrigerating apparatus configured as the refrigerating apparatus for a refrigerator according to the fourth aspect, the high-pressure pressure is maintained at a certain value or more in winter, so that the inside of the refrigerator is cooled by hot gas. The vessel is always defrosted effectively.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is embodied in a refrigeration system will be described below in detail with reference to FIG. In FIG. 1, reference numeral 1 denotes a water-cooled refrigeration apparatus configured as a water-cooled ice maker. In this water-cooled refrigeration apparatus, a compressor 11, a water-cooled condenser 12, a liquid receiver 13, a temperature-sensitive expansion valve 14 as an expansion mechanism, and an evaporator 15 for ice making are sequentially connected by refrigerant piping. The ice making evaporator 15
It is provided in an ice maker (not shown), and makes ice from cold water flowing through the ice maker. Reference numeral 14a denotes a temperature-sensitive cylinder of the temperature-sensitive expansion valve 14, which is provided in a suction gas pipe of the compressor 11. The water-cooled condenser 12 is connected to the cooling tower 3 by cooling water pipes 31 and 32, and a cooling water pump 33 provided in the cooling water pipe 31 supplies cooling water for the condenser. Water-cooled condenser 12
The cooling water supplied to the cooling tower 3 is heated by the water-cooled condenser and is cooled in the cooling tower 3 by the outside air. The cooling tower 3 is a shared facility of the building in which the cooling water pipes 31 and 32 are provided.
Is connected to another product such as the air conditioner 4 illustrated in the drawing. Therefore, the amount of cooling water to the water-cooled condenser 12 is set by the water amount adjusting valve 18 provided in the cooling water pipe 31 on the basis of the maximum load in summer.

In the refrigerant circuit of the water-cooled refrigeration system 1, a condenser pressure adjusting device is provided between the condenser outlet liquid pipe 17 connecting the water-cooled condenser 12 and the receiver 13 and the discharge gas pipe 16. And a hot gas bypass pipe 20 having a condensing pressure regulating valve 21 interposed therebetween. The condensing pressure regulating valve 21 is a three-way valve. When the condensing pressure drops below a predetermined value, the hot gas bypass pipe 20 is opened, and the hot gas bypass pipe 20
The configuration is such that the opening degree on the side is increased to increase the amount of hot gas bypass. Hot gas bypass pipe 20
The hot gas bypassed from enters the receiver 13 directly, increases the pressure in the receiver 13 and prevents the condensing pressure, that is, the high pressure from lowering. Therefore, the liquid receiver 13 is indispensable in the present invention. The cooling water pipe 3
Conventionally, the water supply valves 1 and 32 are provided with a water supply valve for detecting the condensing pressure (high pressure) and reducing the amount of water when the condensing pressure (high pressure) decreases. In the case of the present invention, Such a water supply valve is not provided. Therefore, the cooling water is circulated throughout the year at the initially set water amount as described above.

Further, the discharge gas pipe 16 and the ice making evaporator 1
A de-icing hot gas bypass pipe 24 having an electromagnetic on-off valve 23 and a refrigerant flow control capillary tube 25 interposed therebetween is connected to the inlet side pipe 5. The hot gas bypass pipe 24 opens the interposed electromagnetic on-off valve 23 when predetermined ice is formed in an ice maker (not shown),
Hot gas is bypassed to the ice making evaporator 15.

In the refrigeration system configured as described above, when performing an ice making operation, the compressor 11 is driven.
By driving the compressor 11, a high-pressure gas refrigerant is discharged from the compressor 11. The discharge gas refrigerant is a water-cooled condenser 12
In, it is cooled by the cooling water supplied from the cooling tower 3, condensed and liquefied, enters the liquid receiver 13 and is stored. The liquid refrigerant in the receiver 13 is decompressed by a temperature-sensitive expansion valve 14 as an expansion mechanism, expands and enters the ice making evaporator 15, cools the ice making water to make ice, and the refrigerant itself is heated and cooled. And returned to the compressor 11.

When the outside air temperature decreases in winter, the high pressure (condensing pressure) decreases. If left as it is, the differential pressure between the high pressure and the low pressure becomes small and the refrigerant circulation amount becomes insufficient. However, in the present invention, when the high pressure becomes equal to or less than a predetermined value, the condensation pressure regulating valve 2
The hot gas bypass operation of the hot gas bypass pipe 20 interposed with 1 bypasses the hot gas, prevents the high pressure from lowering, and prevents the refrigeration capacity from lowering. Also, in the present invention, when the ice making water freezes, the electromagnetic on-off valve 23 is opened, hot gas is flown into the ice maker, and ice formed on the ice maker is removed. Since the high pressure is maintained at a predetermined value even in winter, the temperature of the bypassed hot gas is maintained at the predetermined value, and the amount of bypassed hot gas is maintained at the predetermined value, so that effective deicing is always performed. Is performed.

The present invention can be embodied with the following modifications. (1) The water-cooled refrigeration system 1 corresponds to various water-cooled ice-making machines.
Others such as a frozen dessert supply device and a frozen drinking water dispenser also fall under this category. (2) When the water-cooled refrigeration apparatus 1 is configured as a refrigerator refrigeration apparatus, the refrigerant circuit is basically the same as that of FIG. 1, but the configurations of the ice making evaporator 15 and the hot gas bypass pipe 20 are different. come. That is, the ice making evaporator 15 is configured as an in-compartment cooling evaporator. Further, the deicing hot gas bypass pipe 24 is a defrosting hot gas bypass pipe for melting frost adhering to the internal cooling evaporator,
When the amount of frost on the in-compartment cooling evaporator is equal to or more than a predetermined amount, hot gas is circulated to the in-compartment cooling evaporator through this hot gas bypass pipe, and the in-compartment cooling evaporator is defrosted. It is configured to prevent the heat exchange capacity of the cooling evaporator from being lowered. In this case, since the high pressure is maintained at a predetermined value or more, defrosting is always performed effectively.

(3) With respect to the first and second aspects of the present invention, the hot gas bypass pipe 24 for deicing (or defrosting) is not essential and may be omitted. (4) The condensing pressure regulating valve 21 may be a two-way valve type instead of the three-way valve type as shown in FIG. 1 and may be interposed in the hot gas bypass pipe 20.

[0021]

As described above, according to the first aspect of the present invention, the high-pressure pressure is adjusted to a certain value or more by the condensing pressure adjusting device provided in the refrigerant circuit. It does not drop abnormally. In addition, since a water supply valve is not provided in the cooling water circuit as in the conventional case, a fixed amount of cooling water is circulated throughout the year, and the high pressure pressure may abnormally increase in summer due to clogging of the water supply valve. Absent. Therefore, a decrease in refrigeration capacity and burnout of the compressor are prevented.

According to the second aspect of the present invention, when the high pressure decreases in winter, the hot gas is bypassed from the discharge gas pipe to the condenser outlet side, and the decrease in the high pressure is suppressed. Therefore, the high pressure is maintained at a certain value or more, and a decrease in refrigeration capacity is prevented.

According to the third aspect of the present invention, since the high pressure is maintained at a predetermined value or more in winter, deicing of the ice maker by hot gas is always effectively performed.

According to the fourth aspect of the present invention, since the high pressure is maintained at a certain value or more in winter, the defrost of the internal cooling evaporator by the hot gas is always effectively performed. .

[Brief description of the drawings]

FIG. 1 is a circuit diagram of a refrigeration system according to the present embodiment.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Water-cooled refrigeration apparatus, 3 ... Cooling tower, 4 ... Air conditioner, 11 ... Compressor, 12 ... Condenser, 13 ... Liquid receiver,
14: a temperature-sensitive expansion valve as an expansion mechanism; 14a: a temperature-sensitive cylinder of the temperature-sensitive expansion valve; 15: an evaporator for ice making or cooling in a refrigerator;
6 ... Discharge gas pipe, 17 ... Condenser outlet side liquid pipe, 18 ... Water amount control valve, 20 ... Hot gas bypass pipe as condensing pressure adjusting device, 21 ... Condensing pressure adjusting valve, 23 ... Electromagnetic open / close valve, 24 ... Excluding Hot gas bypass pipe for ice or defrost, 25: capillary tube, 31, 32: cooling water pipe, 33: cooling water pump.

Claims (4)

[Claims] In a refrigeration system for cooling a cooling water of a water-cooled refrigeration apparatus such as a refrigerator and an ice maker used throughout the year by a cooling tower, in a cooling water pipe connecting the cooling tower and the water-cooled refrigeration apparatus, Without providing a water supply valve for adjusting the amount of cooling water to adjust the high pressure, a condensing pressure adjusting device is provided in the refrigerant circuit of the water-cooled refrigeration apparatus, and the high pressure is adjusted by the condensing pressure adjusting device. Characterized refrigeration system. 2. A water-cooled refrigeration system having a refrigerant circuit in which a compressor, a water-cooled condenser using cooling tower water as cooling water, an expansion mechanism, an evaporator, and the like are sequentially connected. A hot gas bypass circuit in which a condenser is provided between a discharge gas pipe and a circuit from the water-cooled condenser to the receiver as a condenser pressure regulator; The water-cooled refrigeration system for a refrigeration system according to claim 1, wherein a high-pressure pressure is adjusted by the condensation pressure adjustment valve. 3. The water-cooled refrigeration system, wherein the evaporator is an ice making evaporator attached to an ice maker, and a hot gas bypass pipe is connected between the discharge gas pipe and an inlet pipe of the ice making evaporator. 3. The water-cooled refrigeration apparatus according to claim 2, wherein the apparatus is configured as an ice maker for removing ice by bypassing hot gas to the ice evaporator. 4. The water-cooled refrigeration system, wherein the evaporator is an internal cooling evaporator, and a hot gas bypass pipe is connected between the discharge gas pipe and an inlet pipe of the internal cooling evaporator. 3. The water-cooled refrigeration system according to claim 2, wherein the refrigeration system is configured such that hot gas is bypassed to the in-compartment cooling evaporator to enable defrosting.