JPH0484085A - Ice making device - Google Patents

Abstract

PURPOSE: To make ice uniformly in respect ice making tubes by arranging holding members on the opposite sides of a shell, providing the holding member internally with a rotary blade, holding a plurality of ice making tubes and coupling solution inlet and outlet with a solution piping such that an ice making solution flows respective ice making tubes in series. CONSTITUTION: A shell 1 is provided, on one side in the longitudinal direction, with a refrigerant inlet 1a to be coupled with a refrigerant piping 3 and, on the other side, with a refrigerant outlet 1b to be coupled with a gas refrigerant piping 4 and fixed with members 5, 6 for holding ice making tubes 2,.... A the time of making ice, a liquid refrigerant is fed from the piping 3 into the shell 1, a solution pump in a solution inlet pipe 18a is driven to conduct a solution through each tube 2 and motors 12, 13 are driven to turn rotary blades 8. Level of liquid refrigerant in the shell 1 is controlled such that the lower half section of upper stage ice making tubes 2 are immersed into the liquid. The liquid refrigerant exchange heat with an ice making solution flowing through the tubes 2 and evaporates to supercool the wall face of the tubes 2 below the freezing point of solution. The solution freezing on the inner wall face of the tubes 2 is scratched as slurry ice by means of the rotary blades 8.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an ice-making device, and more particularly to an ice-making device that uses an ice-making solution to produce ice in the form of slurry, which is used as a heat source for air conditioning, for example.

(Prior Art) Conventionally, an ice making apparatus for producing ice in the form of slurry is disclosed in Japanese Patent Laid-Open No. 5E3-2587, and as shown in FIG. An inner tube (A) for producing ice cubes is installed in the center of an outer tube (B) having a larger diameter than the inner tube (A), and the inner tube (A)
) and a rotating drum (D) with blades (C) on the outer periphery.
An ice-making evaporator is configured in such a way that a refrigerant for cooling the solution flows between the inner tube (A) and the outer tube (B), and the inner tube is heated by the evaporation of the refrigerant. The solution flowing through (A) is supercooled and freezes on the inner wall of the inner tube (B), and the rotation of the drum (D) causes ice to form on the inner wall of the inner tube due to the scraping action of the blades (C). There is a device that scrapes off the ice that forms and produces ice in the form of a slurry.

In FIG. 4, (E) is a heat storage tank disposed below the ice making device configured as described above, which stores ice in the form of slurry produced by the ice making device.
) is supplied to fan coil units (F,) to (F,) installed indoors that are connected via ice pipes (G) to perform air conditioning.

Further, (P□) is an ice supply pump installed in the ice pipe (G), and (H) is a solution pipe that supplies ice-making solution from the heat storage tank (E) to the inner pipe (A). and (Pa
) is a solution pump installed in this solution tube (H).

(Problem to be Solved by the Invention) In the conventional example described above, one ice-making evaporator consisting of a pair of inner tubes (A) and outer tubes (B) is used, and a plurality of fan coils are used. Unit (F.

) to (F4) generate the slurry ice used in the fan coil units (F1) to (F4).
In a building air conditioner where a large number of units are installed in 4), the amount of ice used increases, and a problem arises in that the amount of ice produced is insufficient with only one ice-making evaporator.

Therefore, when increasing the amount of ice made in accordance with the amount used, 1
Since there is a limit to the size of one ice-making evaporator, it is necessary to use a plurality of ice-making evaporators.

That is, in order to increase the amount of ice made in the ice-making evaporator having the above-described configuration, it is conceivable to increase the diameter or length of the inner tube (A) and outer tube (B).
Considering the decrease in ice-making performance and the increase in the load on the motor that drives the drum (D), there is a natural limit, and it is impossible to cope with an increase in usage, so it is necessary to use multiple ice-making evaporators. A need arises.

By the way, we have previously proposed an ice-making device that uses a plurality of ice-making evaporators and stacks these evaporators in multiple stages. (Tokugan Showa Ei3
-35Ei No. 31) This multi-stage ice making device has an inner tube (A
) placed in the center of the outer tube (B) (J)
are arranged horizontally in pairs, and these pairs of ice-making evaporators (J) (J) are stacked vertically in multiple stages,
A branch pipe (M) is branched from the refrigerant liquid pipe (K) into the outer pipe (B) of each of these evaporators (J) and has an expansion valve (L) interposed in the middle. and each evaporator (J)
The liquid refrigerant is supplied between the outer tube (B) and the inner tube (A) of the evaporators (J), and the lowermost evaporator is supplied to each inner tube (A) of the evaporator (J). Solution pipes (N) are connected so that the ice-making solution flows in series from the containers (J) (J) to the evaporators (J) (J) in the uppermost layer. In addition, in FIG. 5, (S) is the refrigerant inlet header,
(R) is the exit header.

By the way, in this multistage ice making device in which the solution is made to flow in series, there is a risk that water flow will be obstructed at the water flow confluence point when they are arranged in parallel, resulting in clogging in ice pipes with poor flow. It's for a reason.

On the other hand, when the evaporators (J) are stacked in multiple stages to allow the solution to flow in series, a temperature difference occurs in the solution between the upstream and downstream sides of the solution flow, and as a result, each of the The refrigerant flow flowing into the evaporator (J) is uneven, causing uneven ice formation in each of the evaporators (J), causing strain on the rotating blades installed in the inner pipe (A). This causes a problem in that a large amount of force acts on the motor, increasing the motor load.

For this reason, the amount of liquid refrigerant supplied to each evaporator (J) is controlled individually so that the liquid level of the liquid refrigerant in each evaporator (J) is uniform. As a result, the control system becomes complicated and the cost becomes high.

On the other hand, each outer pipe (B) in each of the evaporators (J)... is provided with an inlet and an outlet for liquid refrigerant, and is individually connected to the branch pipe (M)... Each branch pipe (M)・
It is necessary to install an expansion valve (L) in each of the pipes, or to provide an inlet header (S) for branching the branch pipe (M) and an outlet header (R) for merging the branch pipe (M). However, there were also complications from a structural point of view.

An object of the present invention is to make it possible to uniformize the temperature on the inner wall of a plurality of ice-making tubes without using complicated control such as individually controlling the liquid level height of a liquid refrigerant. We made ice production uniform in the pipes, and made sure that the ice making performance of each ice making tube was fully demonstrated, while also simplifying the structure.
The purpose of the present invention is to provide an ice making device that can be manufactured at a low cost as a whole.

(Means for Solving the Problems) The present invention provides a body (1) with a refrigerant inlet (1a) connected to a refrigerant pipe and a refrigerant outlet (1b) on both sides in the length direction.
Holding members (5) (Ei) are provided, and these holding members (5) (Ei) are provided.
) (6) is equipped with rotating blades (8) for free rotation, and a plurality of ice-making tubes (
2) ... are held at intervals, and a solution inlet (2a) and a solution outlet (2b ), and solution piping (18) is provided at the solution inlet (2a) and solution outlet (2b), and the ice-making solution is supplied to each of the ice-making tubes (2b).
2)... are connected so as to flow in series.

In addition, a plurality of ice-making tubes (2) penetrating the body (1) along the length direction are arranged in an overlapping manner in the vertical direction, and these ice-making tubes (2)... are connected to the bottom ice-making tubes (2). ) to the top ice-making tube (2) so that the ice-making solution flows in series, and the solution is boiled by heat exchange with the ice-making solution in the lower ice-making tube (2). The generated refrigerant bubbles disturb the outer surface of the upper ice-making tube (2), and the disturbance effect improves heat transfer performance.

(Function) Since a plurality of ice-making tubes (2) are housed inside one body (1), even if the ice-making solution is poured in series through these ice-making tubes (2), it will not be possible to achieve the multi-stage structure as proposed earlier. The inner wall temperature of each ice-making tube (2) can be made uniform, and the ice production in each ice-making tube (2) can be made uniform, without the need to individually control the liquid level height of the liquid refrigerant as in a type ice making device. It is.

As a result, since the control system cannot be simplified, each ice making tube (2)
This allows the ice making performance to be fully demonstrated, and it is also possible to avoid applying excessive force to the rotating blades (8) installed in each ice making tube (2).

(Example) In the first example shown in FIG. 1, four ice-making tubes (2) are incorporated into a body (1).

The body (1) has the refrigerant pipe (3) on the - side in the longitudinal direction.
), and a refrigerant outlet (1b) connected to the gas refrigerant pipe (4) is provided on the other side, and the internal space of the body (1) is closed on both sides in the length direction,
Holding members (5) and (6) having holding holes (7) for holding the ice making tubes (2) are attached.

Furthermore, each of the ice making tubes (2) is made longer than the length of the body (1) and passes through the body (1) in the length direction, and both sides of the body (2) in the length direction are connected to the holding member (5). (6) in each of the holding holes (7), and the holding members (5) (8).
) are provided with a solution inlet (2a) and a solution outlet (2b), respectively, on the protruding portions that protrude outward from both sides in the length direction.

The ice tubes (2) of each type are arranged one above the other in pairs as shown in Figure 2, with the lower ice tube (2) and the upper ice tube (2)
2) are arranged so that they overlap each other, and each ice making tube (
2) are each equipped with a rotating blade (8).

This rotary blade (8) is connected to a rotary shaft (9) that is freely rotatably supported via a bearing (not shown) on the end plates (2c) (2d) attached to both longitudinal sides of each ice-making tube (2). It is pivotally attached to the ice-making tube (2) via a stay (10) that projects outward in the radial direction, and the tip of the ice-making tube (2) is brought into elastic contact with the inner wall of the ice-making tube (2) by means of a spring (not shown).

Further, the rotating shaft (9) passes through one end plate (2C) and projects to the outside, and the protruding shaft end is attached to the boot U-(1).
1), and pulleys (14) (15) interlocked with motors (12) (13) provided on both sides of the body (1) in the lateral direction.
) through belts (18) and (17).

In the first embodiment, the ice-making tubes (2) are arranged vertically in a stacked manner as one set, and the ice-making tubes (2) in each set are arranged in series from the lower ice-making tube (2) to the upper ice-making tube (2). A solution pipe (18) is connected so that the ice-making solution flows.

That is, a solution inlet pipe (18a) extending from a heat storage tank (not shown) is connected to the solution outlet (2a) of the lower ice making tube (2), and the solution outlet (2b) of the lower ice making tube (2) is connected to the solution inlet pipe (18a) extending from the heat storage tank (not shown). Connect the solution inlet (2a) of the upper and lower ice making tubes (2) to the connecting tube (18b)
A solution outlet pipe (18c) extending to the heat storage tank is connected to the solution outlet (2b) of the upper ice making tube (2), and the ice making solution supplied from the solution inlet pipe (18a) is It passes through the ice maker (2) and flows out from the communication pipe (18b) through the upper ice maker pipe (2) and into the solution outlet pipe (18C).

However, in order to make ice with the ice making apparatus configured as described above, liquid refrigerant is supplied from the liquid refrigerant pipe (3) to the body (1).
), and also drives a solution pump (not shown) installed in the solution inlet pipe (18a) to cause the solution to flow through each of the ice making tubes (2) through the aforementioned route, and (12) and (13) to rotate the rotary blade (8), the body (1)
The liquid level height of the liquid refrigerant inside the chamber is as shown in Fig. 2.
Control is performed so that the lower half of the upper ice making tube (2) is immersed in the liquid.

The liquid refrigerant supplied into the body (1) flows through the ice making tube (
2) It evaporates by exchanging heat with the ice-making solution flowing inside, and the wall surface of the ice-making tube (2) is supercooled to below the freezing point of the solution by the latent heat of vaporization, and the solution is transferred to the ice-making tube (2). The ice is frozen on the inner wall surface, and the frozen ice is transferred to the rotating blade (
Step 8) generates ice in the form of scraped slurry.

In addition, the ice making tubes (2) exchange heat with the solution in the lower ice making tube (2), and bubbles of the refrigerant generated by boiling reach the upper ice making tube (2), which is separated from the lower ice making tube (2). The outer surface of the upper ice making tube (2) is disturbed, and the heat transfer performance in the upper ice making tube (2) is improved due to the disturbance effect of the air bubbles.

Therefore, since the solution is poured into each ice-making tube (2) in series, the inner wall temperature of each ice-making tube (2) can be made uniform, and ice production in each of these ice-making tubes (2) can be made uniform. This makes it possible to avoid an increase in motor load due to uneven ice formation.

Moreover, the liquid level height of the liquid refrigerant can be controlled by controlling the liquid level within the body (1), and individual control is not required, so the control system can be simplified. (1
) can be used as a gas chamber, the flow of liquid refrigerant from the refrigerant outlet (1b) can be reduced, and the accumulator can be made smaller or omitted.

In the first embodiment described above, four ice-making tubes (2) are used, but the number of ice-making tubes (2) is not limited to four, and may be two to seven as shown in FIG. It can be a book or more.

The number of ice-making tubes (2) to be used is not particularly limited, but is preferably 3 to 7.

For example, when seven ice-making tubes (2) are used, the arrangement of the ice-making tubes (2) is not particularly limited, but as shown in FIG. Solution pipes (18) are arranged in three series: a central paper arranged vertically in a superimposed manner, and two side sets each consisting of two pipes arranged in a superimposed manner above and below, and connected in series in each set. Each solution inlet pipe (18a) is provided with a flow rate control valve (19) to control the solution flow rate to correspond to the number of ice-making tubes (2) connected.

Furthermore, the motors (12) and (13) for driving the rotary vanes (8) installed in the ice-making tubes (2) may be provided corresponding to one set of ice-making tubes (2) as in the first embodiment. However, they may be provided individually, or if the number of ice-making tubes (2) installed is small, they may all be shared.

(Effects of the Invention) As described above, the present invention has the refrigerant inlet (1) connected to the refrigerant pipe.
Holding members (5) and (6) are provided on both longitudinal sides of a body (1) having a refrigerant outlet (1b) and a rotary blade (8). A plurality of ice-making tubes (2), which are rotatably installed inside the body (1) and pass through the body (1) along the length direction, are held at intervals,
The holding member (5) (E3) of each ice making tube (2)...
), a solution inlet (2a) and a solution outlet (
2b), and these solution inlet (2a) and solution outlet (
2b), the solution piping (18) is connected so that the ice-making solution flows through each of the ice-making tubes (2) in series, so that ice-making is possible for a plurality of ice-making tubes (2). Since the ice making solution is not passed in series, the inner wall temperature of each ice making tube (2) can be controlled without the need to individually control the liquid level height of the liquid refrigerant as in the multi-stage ice making device proposed earlier. This makes it possible to uniformly generate ice in each ice making tube (2).

Therefore, the control system for controlling the liquid level of the refrigerant can be simplified, and the cost can be reduced accordingly.
It is also possible to avoid applying unreasonable force to the body (1), and the refrigerant inlet (1a) and refrigerant outlet (1b)
), there is no need to provide a branch pipe (M) or an inlet and outlet header in the multi-stage ice making device,
This structure is simple, and together with the simplification of the control system, the cost can be reduced.

In addition, by arranging the plurality of ice-making tubes (2) arranged in the body (1) in a vertically overlapping manner, the lower ice-making tubes (
2), the boiling bubbles disturb the heat transfer surface of the upper water pipe (2), and the disturb effect improves heat transfer performance.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway front view showing the first embodiment of the present invention, Fig. 2 is a sectional view taken along line ■-■ in Fig. 1, Fig. 3 is a schematic sectional view of the second embodiment, and Fig. 4. is a schematic sectional view showing a conventional example,
FIG. 5 is a conceptual diagram of the multistage ice making device proposed earlier. (1)...Body (1a)...Refrigerant inlet (1b)...Refrigerant outlet (2)...Ice making tube (2a)... ...Solution inlet (2b) ...Solution outlet (5) (6) ...Holding member (8) ...Rotating vane (18) ...Solution Piping

Claims (1)

[Claims] 1) A refrigerant inlet (1a) and a refrigerant outlet (1a) connected to the refrigerant pipe.
Holding members (5) and (6) are provided on both sides of the body (1) in the longitudinal direction, and these holding members (5) and (6)
A rotary blade (8) is rotatably installed inside the body (1).
Multiple ice-making tubes (2) that penetrate along the length of the...
・ are held at intervals, and each of the ice making tubes (2
)... are provided with a solution inlet (2a) and a solution outlet (2b) on the protruding parts of the holding members (5) and (6), and the solution inlet (2a) and the solution outlet (2b) are provided with a solution inlet (2a) and a solution outlet (2b). The pipe (18) is connected to the ice-making solution, which is connected to each ice-making tube (2)...
An ice-making device characterized in that the ice-making devices are connected so as to flow in series. 2) A plurality of ice-making tubes (2) passing through the body (1) in the length direction are arranged vertically in an overlapping manner, and these ice-making tubes (2)... are connected to the bottom ice-making tube (2). ) to the top ice tube (
2. The ice-making apparatus according to claim 1, wherein the solution pipe (18) is connected so that the ice-making solution flows in series toward the ice-making solution.