JPS5928305Y2 - Refrigeration equipment for low temperature warehouses - Google Patents

Description

[Detailed description of the invention] The present invention relates to a refrigeration system for low-temperature warehouses, and in particular, the shutters installed at the inlet and outlet of the cooling equipment installed in the low-temperature warehouse are made of a shape-memory alloy whose shape changes depending on the temperature. The present invention relates to a refrigeration system in which a shutter is automatically closed during defrosting due to the properties of the alloy to prevent warm air within the refrigeration system from flowing into a low-temperature warehouse.

Conventionally, in order to open and close the shutter, a temperature detector for detecting the temperature inside the refrigerator, a complicated interlocking mechanism, and electrical parts to operate the interlocking mechanism are required, which makes the device complicated and expensive.

Therefore, the present invention aims to eliminate the above-mentioned defects and provide a refrigeration system for low-temperature warehouses that has an extremely simple structure and a shutter that operates extremely reliably by utilizing the properties of shape memory alloy. The present invention will now be described in detail with reference to the accompanying drawings, FIGS. 1 and 2.

In FIG. 1, 1 is a low-temperature warehouse, and 2 is a cooling device suspended from the corner ceiling of the low-temperature warehouse 1. The cooling device 2 is connected to an outdoor unit (not shown) to form a refrigeration system. The refrigeration device 2 is composed of a heat exchanger 3, a fan 4, an inlet 5 and an outlet 6, and shutters 7 and 8, which are the characteristics of the present invention, are arranged inside the inlet 5 and the outlet 6, respectively. ing.

The shutter 7.8 is made of a shape memory alloy (for example, T1Ni alloy), and one blade is in a straight line as shown by the solid line during normal cooling operation, as shown in an enlarged view in FIG. , the fixed ends 7a and 8a are fixed with fixing pins 10 and 10, respectively, and refrigerant pipes 9 and 9 which are at high pressure during defrosting are attached to the central parts 7b and 8b.

During defrosting, the free ends 7c are heated by the hot gas flowing through the refrigerant pipes 9, 9.

As shown by the dotted line, 8C is approximately 9 points with respect to the fixed ends 7a and 8a.
It bends at 0° and deforms into an L-shape.

The number of shutters 7.8 is such that the number of blades as described above can close the suction port 5 and the discharge port 6.

Note that as the shape memory alloy forming the shutter 7.8, the alloys shown in the above table are used.

Here, the MS temperature is the temperature at which transformation from the parent phase to the martensitic phase begins, and the AS temperature is the temperature at which the reverse transformation from the martensitic phase to the parent phase begins.

Next, the operation will be explained.

First, during normal cooling operation, the suction port 5 is
The internal air sucked in from the refrigerator is sufficiently cooled by the heat exchanger 3 and blown out from the outlet 6 into the refrigerator, but the internal air is at a sufficiently low pressure and the refrigerant passing through the refrigerant pipe 9 is at a low pressure. Therefore, the refrigerant temperature is low, and the shutters 7.7 made of shape memory alloy disposed at the suction port 5 and the blowout port 6...
. . , 8, 8, . . . , each blade has a substantially consistent linear shape, as shown by the solid line in FIG. 2, and there is almost no resistance to the circulating air.

When frost adheres to the heat exchanger 3 after a certain period of operation, the fan 4 is stopped and the hot gas is shut off by the shutter 7.7.
Defrosting is performed by flowing the refrigerant into the refrigerant pipe 9 attached to the shutters 7.7..., 8, 8... When heated with hot gas heat, the free end of each blade 7 c , B
As shown by the dotted line, c is approximately 9 points relative to the fixed ends 7a and 8a.
It bends at 0° and becomes deformed, closing the air flow path.

Therefore, the air inside the refrigerator is warmed by the high-temperature heat exchanger 3, and it is possible to prevent warm air from flowing into the refrigerator due to natural convection of the air, thereby preventing the temperature inside the refrigerator from becoming high.

In the embodiment described above, the refrigeration system has been described as a separate type formed by the cooling device 2 installed in the low temperature warehouse 1 and an outdoor unit, but it goes without saying that it may be an integrated type.

The refrigeration system for low-temperature warehouses of the present invention includes shutters provided at the inlet and outlet of the cooling system for low-temperature warehouses, such as those shown on the diagonal, made of a shape memory alloy that bends and changes its shape at a predetermined temperature or higher. Utilizing the characteristics of shape memory alloy, the shutter automatically shuts off the inside and outside of the cooling device during defrosting, thereby preventing warm air inside the cooling device from flowing into the refrigerator and increasing the temperature inside the refrigerator. I can do it.

Furthermore, as a means for heating the shutter, a refrigerant pipe that becomes high-pressure during defrosting is attached to the shutter, so there is no need for conventional complicated temperature detectors, electromagnetic devices for opening and closing the shutter, and complicated shutter interlocking mechanisms. This has the advantage that the device can be easily manufactured and provided at low cost.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention, and FIG. 2 is an enlarged view of a shutter blade. 1...Low temperature warehouse, 2...Cooling device, 3
... Heat exchanger, 5 ... Suction port, 6 ...
...Air outlet, 7...Shutter, 8...
...Shutter, 9...Refrigerant piping.

Claims (1)

[Scope of utility model registration request] Shutters 7.8 are respectively disposed at the inlet 5 and outlet 6 of the cooling device 2 installed in the low temperature warehouse 1, and when the shutters 7.8 are opened at a predetermined temperature or higher, the guard ends 7c and 8c are bent. A refrigerant pipe 9 is attached to the shutter 7.8, which is made of a shape memory alloy that blocks circulating air, and which heats the shutter 7.8 to the predetermined temperature or higher using a high-pressure refrigerant that flows during defrosting. Refrigeration equipment for low temperature warehouses.