JPH06147707A - Controlling method for amount of ice making - Google Patents

Abstract

PURPOSE:To prevent a clogging phenomenon in a heat transfer pipe caused by reduction of the amount of a fluid to be cooled in the heat transfer pipe in the case where the amount of ice made in an ice making device is reduced. CONSTITUTION:The flow rate of a fluid to be cooled in a heat transfer pipe 2 is kept unchanged at all times, and the amount of a refrigerant fluid 8 in a shell 3 is controlled. Hereby, the amount of heat transfer is controlled to adjust the amount of made ice.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ice making amount control method for adjusting the amount of ice making by controlling the liquid level of a refrigerant in an ice making device.

[0002]

2. Description of the Related Art Conventionally, in a sherbet ice type ice making method, the amount of ice making is controlled by controlling the amount of liquid to be cooled flowing in a heat transfer tube (tube) of an ice making device (shell and tube type heat exchanger). The method of adjusting the flow rate with a valve is used.

[0003]

However, in such a method, when the amount of ice making is reduced, the flow rate of the liquid to be cooled flowing through the heat transfer tube is reduced. There was a risk that the retention time would increase and the rate of ice making would increase, causing a blockage phenomenon in the heat transfer tube. Further, in extreme cases, the inside of the heat transfer tube may be completely frozen.

An object of the present invention is to provide a method for controlling the amount of ice making, which is made based on the above-mentioned circumstances, and which can always control the amount of ice making under good heat exchange.

[0005]

Means for Solving the Problems That is, the above object of the present invention is a method for controlling the amount of ice making of an ice maker comprising a shell-and-tube heat exchanger, wherein the refrigerant on the barrel side of the heat exchanger is It is characterized in that the amount of heat exchanged between the refrigerant liquid and the liquid to be cooled flowing in the heat transfer tube of the heat exchanger is adjusted by detecting the liquid surface position and varying the amount of the refrigerant liquid supplied to the barrel side. This is achieved by the method of controlling the amount of ice making.

[0006]

The flow rate of the liquid to be cooled flowing in the heat transfer tube is constantly kept constant, and the liquid level position of the refrigerant liquid outside the heat transfer tube (hereinafter sometimes referred to as the shell or shell) is detected to cause the shell By changing the amount of the refrigerant liquid to be supplied, the amount of heat exchanged can be controlled to adjust the amount of ice making. Further, it is possible to prevent the blocking phenomenon due to freezing in the heat transfer tube.

[0007]

Embodiments of the present invention will now be described in detail with reference to the drawings. Needless to say, the present invention is not limited to this embodiment. FIG. 1 is a sectional view of an ice maker applied to an embodiment of an ice making amount control method according to the present invention.

In the figure, the ice maker 1 comprises a general shell-and-tube type vertical multitubular heat exchanger. The ice maker 1 has a heat transfer pipe 2 for passing a liquid to be cooled in a shell 3, and the heat transfer pipe 2 has a liquid outlet nozzle 4 to be cooled.
And the liquid inlet nozzle 5 to be cooled.
Further, the ice maker 1 is provided with a refrigerant liquid inlet nozzle 6 for supplying a refrigerant liquid 8 and a refrigerant gas outlet nozzle 7 for recovering a refrigerant gas 9 vaporized by heat exchange of the refrigerant liquid 8. The liquid 8 flows outside the heat transfer tube 2. The liquid level of the refrigerant liquid 8 in the shell 3 is indicated by reference numeral 10.
Indicated by.

In the ice maker 1 having the above-mentioned structure, the liquid to be cooled is constantly supplied at a constant flow rate from the liquid to be cooled inlet nozzle 5, and heat is exchanged with the refrigerant liquid 8 while passing through the heat transfer tube 2. To release heat, and the mixed liquid of ice and the liquid to be cooled that has not solidified flows out from the liquid to be cooled outlet nozzle 4. On the other hand, the refrigerant liquid 8 flows in from the refrigerant liquid inlet nozzle 6, removes heat from the liquid to be cooled, becomes a refrigerant gas 9, and then flows out from the refrigerant gas outlet nozzle 7. Here, the amount of heat transfer between the liquid to be cooled flowing in the heat transfer tube 2 and the fluid in the shell 3 depends on the heat transfer rate when the fluid in the shell 3 is the refrigerant liquid 8 and the refrigerant gas 9. (Kcal / m ² · h · ° C) is different. Normally, the refrigerant liquid 8 is several tens of times larger than the refrigerant gas 9. Therefore, in order to perform effective heat exchange control, the heat transfer amount is changed by detecting the refrigerant liquid level 10 and adjusting the supply amount of the refrigerant liquid 8 so as to fluctuate the liquid level up and down. Can be controlled. That is, when the amount of ice making is increased, the coolant level 10 is controlled to move upwards,
Further, when it decreases, it is controlled to move downward.

FIG. 2 shows an example of an ice making device incorporating the ice making device 1 having the above structure. That is, in the figure, in this ice making device, a refrigerant gas outlet nozzle 7 of the ice making device 1 is connected to a compressor 11, and the compressor 11 passes through a condenser 12 and a refrigerant liquid inlet of the ice making device 1. It is connected to the nozzle 6. An expansion valve 13 is arranged between the condenser 12 and the refrigerant liquid inlet nozzle 6. Further, a liquid level control transmitter 14 is arranged in the ice maker 1, and the compressor 11 is configured so that the number of revolutions or stroke of the compressor 11 is changed by a signal from the transmitter 14.

In such an ice making device, a constant amount of liquid to be cooled is made to flow in the heat transfer tube 2 of the ice making device 1 and the refrigerant liquid 8 is supplied to the shell 3 to generate ice. that time,
The coolant liquid level 10 is set as an initial state. In the case where the amount of ice generated is adjusted with respect to such a state, the rotational speed of the compressor 11 is automatically changed by changing the position of the refrigerant liquid surface 10 that is initially set. That is, for example, when the production amount is reduced, the position of the liquid surface 10 of the refrigerant is set to a lower position. As a result, a liquid level correction signal is sent from the transmitter 14 to the compressor 11, and the rotation speed of the compressor 11 is reduced so that the refrigerant liquid level 10 is maintained at a predetermined position.

With such a control method, it is possible to accurately control the amount of ice making by changing the supply amount of the refrigerant liquid.

[0013]

As described above, according to the method for controlling the amount of ice making according to the present invention, a constant flow rate of the liquid to be cooled is constantly flown in the heat transfer tube, so that the heat transfer tube is blocked or frozen. No danger at all. Also, by detecting the position of the liquid surface of the refrigerant, the amount of ice making at that time (kg / H
) Is known. Therefore, by tracing the liquid level fluctuation for a certain period of time, it is possible to grasp the total amount of ice making within that period.

[Brief description of drawings]

FIG. 1 is a sectional view of an ice maker applied to an embodiment of the present invention.

FIG. 2 is a block diagram of an ice making device incorporating the ice making device of FIG.

[Explanation of symbols]

 1 Ice Maker 2 Heat Transfer Pipe 3 Shell 4 Cooled Liquid Outlet Nozzle 5 Cooled Liquid Inlet Nozzle 6 Refrigerant Liquid Inlet Nozzle 7 Refrigerant Gas Outlet Nozzle 8 Refrigerant Liquid 9 Refrigerant Gas 10 Refrigerant Liquid Level 11 Compressor 12 Condenser 13 Expansion Valve 14 Liquid level control transmitter

Claims (1)

[Claims] 1. A method for controlling the amount of ice making of an ice maker comprising a shell-and-tube heat exchanger, wherein the liquid level position of the refrigerant on the barrel side of the heat exchanger is detected and supplied to the barrel side. A method for controlling the amount of ice making, wherein the amount of heat exchanged between the refrigerant liquid and the liquid to be cooled flowing in the heat transfer tube of the heat exchanger is adjusted by varying the amount of the refrigerant liquid.