JPS6361887A - Heat exchanger - Google Patents

Abstract

PURPOSE:To permit cooling operation without any loss at all times regardless of the height of the level of liquid to be cooled, by a method wherein a cooler, in which a refrigerant solution circuit is provided at the lower part and an evaporated gas circuit is provided at the upper part in parallel to the refrigerant solution circuit, is floated on the liquid to be cooled. CONSTITUTION:A cooler 7, in which a refrigerant solution circuit 7a is provided at the lower part thereof and an evaporated gas circuit 7b is provided at the upper part thereof in parallel to the refrigerant solution circuit 7a while both of the circuits are connected by a flow passageway, is floated. Refrigerant solution, sent out of a refrigerating cycle 10, flows into the refrigerant solution circuit 7a of the cooler 7, which is floating on the level of the liquid to be cooled in a cargo tank 2. Thereafter, the refrigerant solution deprives the surrounding liquid to be cooled of the evaporating heat and if becomes evaporated gas, enters into the evaporated gas circuit 7b, connected by the flow passageway 7c, passes through a flexible hose 9a further, passes through a gas absorbing pipe 9 and is absorbed into the refrigerating cycle 10. After liquefied in the refrigerating cycle 10, the evaporated gas is supplied to the cooler 7 as the refrigerant solution again through the refrigerant solution supplying pipe 8. The cooler 7 is floated on the level of the liquid to be cooled while receiving the continuous supply of the refrigerant solution in such a manner thereby cooling the liquid to be cooled to a predetermined temperature.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a heat exchanger for a liquid carrier that requires cooling.

[Conventional technology]

For example, on an orange juice carrier, it is necessary to maintain the temperature of the cargo (orange juice) at around -10°C. Similarly, there are chemical ships that transport liquids while maintaining low temperatures.

These carriers require efficient heat exchangers that are not of the tank type.

Conventional methods can be roughly divided into the following two types.

(1) Independent tank system As shown in Figure 7, an independent tank 2a is provided inside the hull 1, and the cargo liquid in the independent tank 2a is kept at a low temperature by passing cool air through a ventilation passage 2b provided around the hull. It is something. In the top view, 6 is a heat-insulating layer.

(2) FRAMO Although this method is not often used in orange juice transport ships, it is a method that is often used to keep the cargo tanks of chemical ships at a low temperature. As shown in FIG. 8, as a method of keeping the liquid loaded inside the cargo tank 2 at a low temperature, a refrigerant pipe 5 connected to a refrigerator unit 4 installed at another location is connected to the inside of the cargo tank 2. It is fixed to the wall and cools the liquid inside the tank.

[Problem that the invention seeks to solve]

Traditional methods have the following drawbacks.

(1) Independent tank system According to this system, an independent tank 2a is installed separately from the hull, and a cold air passage 2b is also formed, resulting in a complicated structure and high cost.

(21FRAMO method) In this 1 set, the refrigerant pipe 5 in the cargo tank 2 is fixed to the side wall of the tank, so when the cargo liquid is not full, the refrigerant pipe 5 is exposed above the liquid surface, reducing cooling loss. Furthermore, since the refrigerant pipe 5 is located on the side wall, the cargo pump 6 is occasionally driven to stir the liquid in the tank and cause convection, as shown in Fig. 8, so that the entire liquid comes into contact with the refrigerant pipe 5. It is necessary to circulate it so that

[Means for solving problems]

The present invention has been made to solve these five problems, and has a refrigerant liquid circuit connected to the refrigerant liquid supply pipe from the refrigeration cycle in the lower part, and a refrigerant liquid circuit in the upper part connected to the refrigerant liquid supply pipe from the refrigeration cycle. To provide a heat exchanger in which a cooler including a liquid vaporized gas circuit and a liquid vaporized gas circuit connected to the inlet side of a refrigeration cycle is floated on a liquid to be cooled.

[For production]

Since the refrigerant liquid in the lower refrigerant liquid circuit evaporates, the cooler floating on the liquid to be cooled takes away the heat of vaporization from the liquid to be cooled in the vicinity and cools the liquid to be cooled. Next, the vaporized gas of the refrigerant liquid is stored in the vaporized gas circuit at the top of the cooler, then sucked into the refrigeration cycle from the inlet side of the refrigeration cycle, liquefied in the refrigeration cycle, and then cooled through the refrigerant liquid supply pipe. It is pushed out again into the refrigerant liquid circuit at the bottom of the vessel. In this way the cooling action is repeated.

〔Example〕

FIG. 1 is a schematic diagram of an embodiment of the present invention, and fAl is a side view. In the figure, above the surface of the liquid to be cooled stored in the cargo tank 2, a refrigerant liquid circuit 7a is installed in the lower part and a vaporized gas circuit 7b is installed in the upper part, as shown in FIG. 2, and they are connected by a flow path 7c. The cooler 7 is floating. The refrigerant liquid circuit 7a includes a refrigerant liquid supply pipe 8 connected to the refrigeration cycle 10, and the vaporized gas circuit 7b includes a gas absorption pipe 9 connected to the inlet side of the refrigeration cycle 100, and a flexible hose 8.
They are connected via a.9a.

Next, FIG. 3 is a schematic diagram showing the configuration of the refrigeration cycle 10. In the figure, 11 is a refrigerant liquid separator.

Reference numeral 12 denotes a liquid pump, which is connected to the refrigerant liquid supply pipe 8 described above. The vaporized gas inhaled through the gas absorption tube 9 is
It passes through the upper part of the refrigerant liquid separator 11 and is compressed by the compressor 13, and after removing impurities by the oil separator 14, it enters the condenser 15 where it is condensed and liquefied, and after being stored in the receiver 16, it is sent to the refrigerant liquid separator 11, It is designed to be sent out again as a refrigerant liquid.

Next, the operation of the heat exchanger according to the present invention will be explained.

In FIG. 1, the refrigerant liquid sent out from the refrigeration cycle 10 passes through the supply pipe 8, passes through the flexible hose 8a, and floats on the surface of the liquid to be cooled in the cargo tank 2 through the refrigerant liquid circuit of the cooler 7. 7a. After that, the heat of vaporization is removed from the surrounding liquid to be cooled to form a vaporized gas, which enters the vaporized gas circuit 7b connected by the flow path 7c, further passes through the flexible hose 9a, passes through the gas absorption pipe 9, and is absorbed into the refrigeration cycle 10. Be it. After being liquefied in the refrigeration cycle 1o, it is again supplied as a refrigerant liquid to the cooler 7 through the refrigerant liquid supply pipe 8. In this way, the cooler 7 floats on the surface of the liquid to be cooled while receiving a continuous supply of refrigerant liquid,
Cool the liquid to be cooled to a runaway temperature.

When carrying out the present invention, a guide support 17 is provided between the inner wall of the tank and the floating cooler 7 as shown in FIG. 4 to prevent the shaking of the cargo liquid caused by the shaking of the ship. Further, as shown in FIG. 5, if the bent pipe portion of the cooler 7 is made into a flexible tube 18, it becomes easy to take it out from the cargo tank 2. Further, FIG. 6 (Al and (B
A simple structure as shown in 1 is also possible.

Furthermore, by providing fins on the outer periphery of the refrigerant liquid circuit 7a, the cooling effect is further improved and the pipe length can be shortened.

〔Effect of the invention〕

According to the present invention, the liquid to be cooled is cooled by floating a cooler capable of absorbing vaporization heat continuously above the surface of the liquid to be cooled, so there is always no loss in cooling regardless of the height of the surface of the liquid to be cooled. Be able to do the work. Furthermore, since the liquid to be cooled is cooled from the upper surface, convection is naturally generated within the liquid to be cooled and the entire liquid is cooled, so there is no need for stirring. As described above, the effects of improved cooling efficiency and energy saving are significant.

[Brief explanation of drawings]

Fig. 1 is a schematic diagram of an embodiment of the present invention, (Al is a side view, (Bl is a plan view, Fig. 2 is a sectional view showing the structure of the cooler, Fig. 3 is a configuration diagram of the refrigeration cycle, Figures 4 to 6 are schematic diagrams of other embodiments, and Figures 7 and 8 are schematic diagrams of conventional examples. 1: Hull, 2: Cargo tank, 2a: Independent tank, 2b
2 ventilation paths, 3: heat insulation layer, 4: refrigerator unit, 5: refrigerant pipe, 6: cargo pump, 7: cooler, 7a: refrigerant liquid circuit, 7b: vaporized gas circuit, 7C: distribution path, 8: refrigerant Liquid supply pipe, 9: gas absorption pipe, 10: refrigeration cycle. Agent: Patent Attorney Tadashi Sato Figure 2, Figure 3t! y Figure 4 Figure 5 Figure 6 Mother (A) (B) 10 Eji 8 Figure

Claims (1)

[Claims] A refrigerant liquid circuit connected to a refrigerant liquid supply pipe from the refrigeration cycle is provided at the lower part, and a refrigerant liquid vaporized gas circuit that flows through the refrigerant liquid circuit is provided at the upper part, and the vaporized gas circuit is connected to the inlet side of the refrigeration cycle. A heat exchanger in which a cooler consisting of a cooler is suspended above the liquid to be cooled.