JP2513048Y2 - Freezing release device for double cylinder coil heat exchanger - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a novel freeze release device which can be attached to a double in-cylinder coil heat exchanger for cooling water or the like to near the freezing point or for supercooling.

[0002]

2. Description of the Related Art As a conventional apparatus for producing supercooled water, a system in which a spiral or spiral water pipe is immersed in a brine tank and the brine is stirred by a stirrer to cool the raw water in the water pipe, A method is known in which raw water is passed through an inner pipe of a straight double pipe and brine is passed through an outer pipe for heat exchange to cool the raw water.

By the way, in the heat exchangers of the conventional supercooled water producing apparatuses, when the raw water in the water pipe is frozen due to various factors, the water pipe is taken out from the brine tank, or
Or after draining the brine, freeze the water pipe with a heater provided at a position away from the water pipe, or
Freezing in the water pipe must be released by flowing warm water instead of brine.

[0004]

However, in the above-mentioned freeze releasing means, it is necessary to perform troublesome work such as discharging the brine, taking out the water pipe or inserting the heater, and most of the heat of the heater is There are many inconveniences such as being released to the outside and requiring a long time for thawing.

[0005]

DISCLOSURE OF THE INVENTION An antifreezing device for a double in-cylinder coil heat exchanger according to the present invention is made based on the above-mentioned problems, and a tubular member is provided between an inner casing and an outer casing. In the configuration of the double in-cylinder coil heat exchanger arranged in a spiral shape, the flow rate sensor is inserted in the middle of the chilled water circulation path, and the inner casing is heated by the freeze release heater operated by the output signal of the flow rate sensor. The feature is that the freeze can be released from inside.

[0006]

According to the present invention, the flow rate sensor inserted in the cold water circulation path monitors the flow of water, and when a freezing phenomenon occurs and water flow is stopped, the controller outputs the output signal from the flow rate sensor. Via, turn the brine circulation pump off and turn on the freeze release heater. Then, by freezing the inside of the tubular member by the action of the heater and confirming the water flow by the flow rate sensor, the heater is turned off, the brine pump is turned on at the same time, and the cooling water manufacturing operation is restarted. be able to.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a system diagram of an apparatus for producing supercooled water obtained by applying the present invention. In the figure, (1) is a refrigerator, (2) is a brine tank, (3) is a heat exchanger according to the present invention, (4) is a cold water storage tank, and (5) is a controller.

The refrigerator (1) uses, for example, a system in which the liquefied refrigerant is decompressed by the expansion valve (1a) and then the brine is cooled by the latent heat of vaporization. It is equipped with a exchanger (1b).

The brine tank (2) is connected with brine circulation paths (6) and (7) for introducing internal brine (cooling medium) into the heat exchanger (3) for circulation. A brine circulation pump (8) is installed on the way. Similarly, the cold water circulation paths (9), (10) and the cold water pump (11) are connected between the heat exchanger (3) and the cold water storage tank (4). The fluid to be cooled is designed to flow. The flow rate sensor (12) according to the present invention is inserted in the cold water circulation path (10).

The heat exchanger (3) comprises an inner casing (13),
It consists of an outer casing (14) and a tubular member (15) arranged helically between them. As is clear from FIGS. 2 and 3, in this type of heat exchanger, a fluid to be cooled such as water flows through the inside of the tubular member (15), while the brine sets the main flow of the tubular member. A spiral flow path (16) extending along (15) and inner and outer casings (13), (1
Leakage flow path bypassing the gap between 4) and the tubular member (15)
It is divided into (17) and is configured to repeat merging. still,
The lid plate (18) is applied to the upper and lower ends of the inner casing (13) and the outer casing (14) to block the flow path formed between them, but inside the inner casing (13) Is hollow.

The freeze releasing device of the present invention comprises a heater (19) provided in the inner casing (13). This heater (19), for example, an electric resistance wire rod such as a nichrome wire,
As shown in FIG. 1, the heater (19) is turned on when it is inserted into the inner space of the inner casing (13) of the heat exchanger (3).
Switching off is done by the controller (5). This controller (5) consists of the refrigerator (1) and the brine pump (8).
, And the flow rate sensor (12) and the signal line (20) respectively, and receives the output signal from the flow rate sensor (12) and controls the elements such as the refrigerator (1) described above. To do.

The cold water storage tank (4) communicates with the tubular member (15) in the heat exchanger (3) through the cold water circulation paths (9) and (10), and the supercooled water flows into the cold water storage tank (4). The section is frozen and can be stored. (21) is a valve for supplying room temperature water to the cold storage water tank (4) for defrosting, (22) is a valve for taking out the obtained cooling water, and (23) is air for freezing. Is an air valve to put in. (Fig. 1)

In the supercooled water producing apparatus having the above structure,
The brine at the specified temperature (about -10 ° C) in the brine tank (2) is driven by the circulation pump (8) through the brine circulation path (6) to the inside of one end of the heat exchanger (3), the upper end in the drawing. When introduced between the outer casings (13) and (14), brine goes around the spiral passage (16) formed along the tubular member (15) as shown by the arrow in the figure. And those that bypass the gap (17) between the tubular member (15) and the inner and outer casings (13) and (14) (see FIG. 2). On the other hand, the water flowing through the cold water circulation passages (9) and (10) driven by the water circulation pump (11) flows from the lower end of the heat exchanger (3) to the water pipe or tubular member (tube) as shown by the arrow in FIG. It flows through the inside of 15) and flows in the direction opposite to that of the brine, and returns to the cold water storage tank (4). At that time, at the same time as heat exchange between brine and water in the spiral flow path (16), the leakage flow path (17)
The peripheral wall of the tubular member is cooled uniformly and entirely by the brine passing through the pipe, and the heat transfer coefficient for water is improved.

As described above, the brine is circulated through the spiral flow channel (16) and the leakage flow channel (17) to form a tubular member.
By feeding water into (15), when it recirculates to the cold storage water tank (4), it becomes supercooled water below freezing point temperature (about -4 ° C), and about 5% of it becomes ice fragments. By performing continuous operation, a required amount of ice blocks and sorbets can be stored in the cold storage water tank.

In the process of producing supercooled water as described above,
Due to an unexpected accident, the tubular member (1) of the heat exchanger (3)
If the supercooled water freezes in 5), the flow sensor (12)
Detects the stop of water flow and notifies the controller (5) to stop the brine pump (8) and the refrigerator (1) and at the same time turn on the heater (19), and if necessary, the air intake valve (23). open.
The heater (19) that generated heat when energized is
Heat is transferred from the inner peripheral surface of 3) to the freezing part of the tubular member (15) to release the freezing. When the freezing is released and water begins to flow in the tubular member, the flow sensor (12) detects the water flow and notifies the controller (5) to turn off the heater (19) and turn off the air valve (2).
It is possible to restart the production of supercooled water by closing 3) and restarting the pump (8) and the refrigerator (1).

FIG. 4 shows an embodiment in which a plurality of heat exchangers (3) are provided for one cold storage water tank (4), and when a large amount of supercooled water is produced or one heat Even when the exchanger is frozen, the other heat exchangers are operating, which is effective for continuously producing supercooled water. Although two heat exchangers are installed in this embodiment, it is also possible to install two or more heat exchangers, and the refrigerating machine brine tank and the circulation pump are enlarged to provide a plurality of heat exchangers. Brine can also be supplied to the exchanger. In that case, a valve is installed in the brine circulation path (6) of each heat exchanger, the brine pump (8) connected to the frozen heat exchanger is turned OFF and ON, and the valve of the brine circulation path (6) is closed. Open. Similarly, the cold water pump can be shared.

[0017]

As described above, in the defroster for a heat exchanger of the present invention, since the heater is inserted inside the inner casing of the heat exchanger, the entire length of the water pipe in the heat exchanger can be efficiently heated. Therefore, it is possible to release the freeze in a short time, and moreover, it can be manufactured in a small size and at a low cost without taking up an installation place. In addition, the freezing is sensed by the flow rate sensor in the cold water circulation path, and the heat exchanger is automatically stopped, frozen, and restarted, which is effective in saving labor.

[Brief description of drawings]

FIG. 1 is a system diagram of a supercooled water production apparatus showing an embodiment of the present invention.

FIG. 2 is a partial cross-sectional view showing a part of the heat exchanger of FIG. 1 in an enlarged manner.

FIG. 3 is an enlarged cutaway plan view showing the heat exchanger of FIG. 1.

FIG. 4 is a system diagram of a supercooled water producing apparatus showing another embodiment replacing the embodiment of FIG.

[Explanation of symbols]

 (3) Heat exchanger (4) Cold water tank (9) Cold water circuit (10) Cold water circuit (12) Flow sensor (13) Inner casing (14) Outer casing (15) Tubular member (water pipe) (19) Heater

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Creator Kyosuke Sasaki 3-chome, Asahi-cho, Nishibiwajima-cho, Nishikasugai-gun, Aichi Pref. Masayuki Hasui (56) Ref. -344041 (JP, A) JP-A-3-99140 (JP, A) Actually open 4-129040 (JP, U) Actually open 54-73558 (JP, U)

Claims (1)

(57) [Scope of utility model registration request] 1. An inner casing (13) and an outer casing (1
In the configuration of the double in-cylinder coil heat exchanger in which the tubular member (15) is spirally arranged between the cold storage water tank (4) and the cold water circulation path (9) with respect to the heat exchanger (3). ), Connected via (10), while inserting the flow sensor (12) in the middle of this cold water circulation path (10), in the space inside the inner casing (13),
A freeze release device for a double in-cylinder coil heat exchanger, wherein a freeze release heater (19) that operates according to the output signal of the flow rate sensor (12) is installed.