JPH0228426Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a simulated ice sea manufacturing device for conducting various types of simulation experiments such as durability tests on icebreakers, polar ships, offshore structures, etc.

[Conventional technology]

Scale models of polar offshore structures such as icebreakers, polar ships, and oil platforms are created at the design stage, and simulations are performed in an aquarium that simulates the actual icy ocean to test stress, resistance, etc. under various conditions. ing.

However, the following problems arose in the means for cooling and freezing the test chamber and the ice seawater tank.

(1) Since the freezing rate of ice in the aquarium is slow in the conventional method, one experimental cycle is long and it is not possible to increase the number of experiments.

(2) The ice quality of the ice layer is not good.

(3) An uneven avatar appears on the ice surface.

(4) Accurate experimental results cannot be expected because there are many deviations in the ice thickness at the end of freezing, and the ice thickness varies depending on the location in the tank.

There is a natural convection type device shown in FIG. 3 as a conventional ice sea simulation experiment device.

In the figure, a test chamber 2 consisting of a heat insulating structure chamber body 1
A water tank 3 is provided at the bottom of the tank, and the water tank 3 contains water 4 for freezing. On the other hand, a cooling coil 5 is suspended from the ceiling of the test chamber 2 by a hanging fitting 6, and refrigerant or cooled brine from a refrigerator 8 is supplied to the cooling coil 5 from a refrigerant pipe 7. There is.

In the above system, the water 4 in the water tank 3 is frozen by natural convection of the air in the test chamber 2 by cooling the cooling coil 5 to about -25°C, which has the advantage of having a particularly small deviation in ice thickness. However, it has the drawbacks (1) to (3) mentioned above, and in addition, it is necessary to arrange a large cooling coil 5 to cover the entire top surface of the water tank in order to improve air heat transfer, which increases equipment costs and maintenance costs. increases.

Furthermore, since large and heavy cooling coils are suspended from the ceiling of the test chamber, the structural strength of the test chamber must be increased, which has the disadvantage of increasing the cost of the test equipment.

Furthermore, avatars are formed on the surface of the ice due to falling lumps of frost attached to the cooling coil and falling water droplets from the drain during defrosting during testing.

In order to prevent this, a drain pan 1 that receives water droplets falling from the cooling coil is installed as shown in Figure 4.
0 in the test chamber below the cooling coil, but this results in obstruction of air convection within the test chamber and a decrease in cooling efficiency.

[Problem that the invention attempts to solve]

In order to solve the above-mentioned drawbacks, the present invention installs a cooling coil outside the test chamber, and forces only the cooled air into the test chamber through a duct. By blowing the water in such a way that the flow direction is reversed after the water elapses, the freezing speed of the water surface can be adjusted, a surface layer of uniform thickness can be obtained, and the equipment can be made more compact.

[Means for solving problems]

The simulated ice sea production device of the present invention is provided with a pair of cold air ducts facing each other with each cold air outlet opening laterally so that the flow of cold air follows the surface of the water in the tank, in a test chamber with a water tank at the bottom. The cold air duct has a structure in which cold air generators installed outside the test chamber are connected through ducts each having a damper, and the blowing direction of the cold air is reversible by switching the dampers in each duct.

[Effect]

The cold air sent out from the cold air generator is blown directly along the water surface of the water tank in the test room, and the blowing direction of the cold air is reversed after a predetermined period of time, so that there is almost no unevenness in the thickness of the effective ice layer. A simulated ice sea with uniform thickness can be reproduced.

〔Example〕

Next, one embodiment of the present invention will be described in detail with reference to a specific example shown in the accompanying drawings.

In FIG. 1, a water tank 3 for storing water 4 is provided at the bottom of a test chamber 2 constituted by a heat-insulating structure chamber body 1. Also, on the left and right of the exam room,
A pair of cold air supply devices 14a and 14b are provided, each consisting of cold air ducts 13a and 13b whose upper ends are connected to the chambers 12a and 12b and whose lower ends are opened with cold air inlets and outlets 11a and 11b.
The openings a and 11b are tilted so that cold air is blown out along the surface of the water in the tank.

In addition, rails 10a and 10b are laid on the left and right sides of the water tank, and a carrier 28, which also serves as a measurement chamber and hangs over the water tank, is provided on the rails so as to be movable in the longitudinal direction of the test chamber. Mock ship 2 that can be moved by breaking ice as it moves
5 is attached by a rod 27.

On the other hand, outside the test chamber 2, there are a blower 16 and a heater 17 inside the casing 15, and a cooling coil 1 to which low-temperature refrigerant is supplied from a refrigerator 18 through a refrigerant pipe 7.
A ventilation generator 20 is provided, and a ventilation duct 22 is connected to the cold air outlet 15a. The same duct has a damper 21a,
Branch ducts 22a, 22b having 21b are connected, each branch duct being connected to a chamber 12a, 12b of the cold air supplier, respectively;
Dampers 23 are provided from the chambers 12a and 12b, respectively.
A return duct 24a, 24b with a, 23b is connected to the inlet 15b of the cold air generator 20.

An example of the present invention has the above-mentioned structure, in which the cold air generator 20 cools the air taken in through the intake port 15b with the cooling coil 19, and passes it through the branch duct 22a or 22b to each chamber 12a in the test chamber 2.
Or send it to damper 12b, but damper 21b, 23b
is opened and dampers 21a and 23a are closed.
The cold air flows in the direction of the solid arrow and reaches the left chamber 12.
a, and is blown diagonally directly onto the water surface of the freezing water tank 3 from the inclined cold air outlet 11a at the lower end of the left cold air duct 13a. This air is absorbed from the cold air port 11b at the lower end of the right duct 13b, passes through the right chamber 12b, the return duct 24b, and is sucked into the cold air generator 20 from the suction port 15b.

By repeating the above circulation, 2 ice cubes are formed on the water surface.
6 is generated, but the ice layer that is generated is thicker on the cold air outlet side, that is, on the left side in Figure 1, and thinner on the right side.

However, in the present invention, by opening the dampers 21a and 23a and closing the dampers 21b and 23b, the flow of cold air is reversed, and the cold air from the cold air generator 20 is directed onto the ice surface from the cold air outlet 11b of the right duct 13c. is blown out, the same cold air is sucked into the left duct, and the flow of the cold air is reversed in the direction of the dashed arrow.

By switching the cold air blowing direction as described above, there is no difference in ice thickness between the upstream and downstream sides of the airflow, and ice with an even thickness is formed as shown in Figure 2. Ru.

Note that the ice layer is slightly thicker on the left and right parts near the cold air vents 11a and 11b (approximately 0.5 m/m), but in experiments, the simulated ship 25 etc. is usually placed in the center part of the tank (the effective ice layer part that is not on both sides). Since this is done by

[Effects of this invention]

The present invention described above has the following effects.

(1) Since it is a method that forces air into the cooling coil, the heat transfer rate to the air is high, and compared to the conventional natural convection freezing type, the freezing speed can be increased with a smaller cooling coil. Both equipment costs and maintenance costs are reduced.

(2) Since the freezing rate becomes faster, the experimental cycle can be shortened and the number of experiments can be increased.

(3) Since the cold air generation equipment is installed outside the test room, the structural strength of the test room can be reduced.

(4) Since draining during defrosting is facilitated, cooling coils can be defrosted even during testing.

(5) If the flow direction of the airflow is constant, the part of the ice layer on the downstream side of the airflow will be thinner than the part on the upstream side of the airflow, so the ice thickness will differ between the upstream and downstream sides of the airflow. However, since this device reverses the flow direction of the airflow at predetermined intervals, an ice layer that becomes thinner toward the downstream side of the airflow does not occur, and the effective ice The ice layer can be formed to have a uniform thickness with no unevenness.

[Brief explanation of the drawing]

Figure 1 is a diagram showing an example of the simulated ice sea production apparatus according to the present invention, Figure 2 is a longitudinal cross-sectional view showing the frozen state, Figure 3 is a diagram showing the conventional simulated ice sea experiment apparatus, and Figure 4 is a diagram showing the drain pan. FIG. 2 is a diagram showing a conventional simulated ice sea laboratory. In the figure, 1...Insulation structure chamber body, 2...Test chamber, 3
...Water tank, 4...Water, 5,19...Cooling coil,
6... Hanging fittings, 7... Refrigerant pipes, 8... Freezer, 1
0...Drain pan, 11a, 11b...Cold air outlet,
12a, 12b...chamber, 13a, 13b
...Cold air duct, 14a, 14b...Cold air supply device, 15...Casing, 15a...Cold air outlet,
15b... Suction port, 16... Air blower, 17... Heater, 18... Refrigerator, 20... Cold air generator, 2
1a, 21b, 23a, 23b...damper, 22
...Blower duct, 22a, 22b... Branch duct, 24a, 24b... Return duct, 25... Simulated ship, 26... Ice.

Claims (1)

[Scope of utility model registration request] A pair of cold air ducts are installed in the test chamber that has a water tank at the bottom, with each cold air outlet opening laterally and facing each other so that the flow of cold air follows the surface of the water in the tank. This is a simulated ice sea production device in which cold air generators installed in each duct are connected via ducts each having a damper, and the direction of cold air blowing is reversible by switching the dampers in each duct.