JPH0558400A - Space chamber device for heat vacuum test - Google Patents

Abstract

PURPOSE:To ensure heat vacuum environment without providing any refrigerant circulating means and to reduce the size of a device. CONSTITUTION:When liquefied nitrogen is fed from an LN2 feed source to a plate body 11, the plate body 11 and a cylinder body 12 are filled with liquefied nitrogen to cool a closed container 10 to heat vacuum environment. When heaters 14 and 15 are driven to heat the plate body 11 and the cylinder body 12, liquefied nitrogen is gasified to generate nitrogen gas, which is discharged through the plate body 11 and the cylinder body 12. A space chamber device for heat vacuum test is formed as mentioned above to achieve an initial purpose.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a space chamber apparatus used for a ground thermal vacuum test of a spacecraft such as an artificial satellite and onboard equipment such as various sensors.

[0002]

2. Description of the Related Art In recent years, in the field of space development, a thermal vacuum test simulating outer space has become indispensable for developing onboard equipment including spacecraft. As a means for carrying out this thermal vacuum test, a space chamber device for accommodating a test body and securing a thermal vacuum environment is used.

FIG. 5 shows such a conventional space chamber device, in which a hollow box body 1 called a shroud is provided in a closed container (not shown) in which a vacuum environment is maintained. The box body 1 is provided with a refrigerant inlet / outlet, and a refrigerant pipe 2 is connected to the refrigerant inlet / outlet via a transfer portion 3 such as a pump or a compressor. The output side of the refrigerator 4 is connected to the transfer section 3, and the refrigerant liquid cooled by the refrigerator 4 such as liquid nitrogen is supplied to the refrigerant outlet. Liquid nitrogen is supplied to the refrigerator 4 from the liquid nitrogen supply source 5 together with the nitrogen gas vaporized in the box 1, and the supplied nitrogen gas and liquid nitrogen are liquefied and output to the transfer unit 3. As a result, the box body 1 is cooled to near the liquid nitrogen temperature (-180 degrees Celsius), and the inside of the closed container (not shown) kept in a vacuum state becomes a thermal vacuum environment corresponding to the space environment.

However, in the above space chamber apparatus, in order to secure a thermal vacuum environment, circulation equipment such as a transfer section 3 and a refrigerator 4 for circulating liquid nitrogen in the cylinder must be provided, so that the structure is improved. It had a problem that it was very complicated, large-scale, and large. This problem is caused by a sealed container (not shown) in a thermal vacuum test of on-board equipment such as a sensor which is relatively small compared to a large spacecraft or the like configured to perform a thermal test. Compared to the shape and size of), the ratio of the circulation equipment becomes very large, which is remarkable.

[0005]

As described above, in the conventional space chamber apparatus for thermal vacuum test, since the circulation equipment for circulating the liquid nitrogen must be provided, the structure becomes very complicated and large, It had the problem of becoming large.

The present invention has been made in view of the above circumstances, and provides a space chamber apparatus for a thermal environment test, which has a simple structure and is capable of ensuring a thermal vacuum environment, thereby promoting miniaturization. The purpose is to provide.

[0007]

According to the present invention, there is provided a hollow cylindrical body which is arranged along a peripheral wall of a closed container which is kept in a vacuum environment, and which is arranged at one end of the cylindrical body. A hollow plate body on which a test body communicated with the body is mounted, and a coolant liquid supply means for supplying a coolant liquid to the plate body to fill the cylinder body,
A gas discharge means provided in the cylindrical body for selectively discharging the vaporized gas of the refrigerant liquid, and a gas pressure of a gas generated by vaporizing the filled refrigerant liquid by heating the cylindrical body and the plate body. The space chamber device for a thermal vacuum test is configured by including a refrigerant liquid discharge means for discharging the refrigerant liquid filled in.

[0008]

According to the above construction, when the refrigerant liquid is supplied to the cylinder body and the plate body through the refrigerant liquid supply means, the closed container kept in the vacuum environment is cooled to set the thermal vacuum environment. And
Then, when the refrigerant liquid discharge means is operated and the heating is controlled in the cylinder body and the plate body, the filled refrigerant liquid is vaporized, and the filled refrigerant liquid is pressed by the gas pressure and returned to the refrigerant liquid supply means. Be done. This makes it possible to secure a thermal vacuum environment by using a necessary amount of the refrigerant liquid without providing a circulation means for circulating the refrigerant liquid as in the conventional case, and to promote miniaturization.

[0009]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 shows a space chamber apparatus for a thermal vacuum test according to an embodiment of the present invention, in which a closed container 10 is kept in a vacuum environment via a vacuum pump (not shown). On the bottom surface of the closed container 10, one side is provided with the specimen mounting portion 1
A hollow plate body 11 having 1a is arranged. As shown in FIG. 2, a hollow cylindrical body 12 is provided on one surface of the plate body 11.
Are arranged so as to cover the test body mounting portion 11a. This cylindrical body 12 is arranged along the inner wall of the closed container 10,
It is communicated with the plate body 11 via the connection pipe 13. The plate body 11 is connected to an LN2 supply pipe connected to a liquid nitrogen (LN2) supply source (not shown), and an LN2 discharge heater 14 is laid on one surface thereof. On the other hand, the cylindrical body 12 is provided with a heater 15 for discharging a refrigerant liquid at one end on the plate body 11 side,
Gas discharge valve 16 for nitrogen (N2) gas discharge at the other end
Is installed.

In the above-mentioned structure, when the thermal environment test is carried out, as shown in FIG. 3, the test body 17 is first mounted on the test body mounting portion 11a of the plate body 11, and then the vacuum pump (not shown). ) Is driven to set the closed container 10 in a vacuum environment state. At this time, the LN2 supply source (not shown) is activated, and LN2 is supplied to the plate 11 of the closed container 10. Then, the LN2 is first filled in the plate body 11 and then in the cylindrical body 12, and the inside of the closed container 10 is kept in a thermal vacuum environment. Here, the gas discharge valve 1 of the cylindrical body 12
6 is set to an open state by a predetermined amount, the vaporized N2 gas is discharged little by little, and LN2 is sequentially supplied to maintain a desired thermal vacuum environment, and the thermal vacuum test of the test body 17 is performed here. To be done.

When the thermal vacuum test is completed, the gas exhaust valve 16 is closed and a power source (not shown) is operated to supply power to the heaters 14 and 15. Then, Fig. 4
LN2 filled in the plate body 11 and the cylinder body 12 as shown in FIG.
Is vaporized. As a result, LN2 is discharged by gas pressure together with N2 gas so as to be extruded to the LN2 supply source (not shown). Here, the sealed container 10 is returned to the ground environment by stopping the driving of the vacuum pump (not shown), the test body 17 is separated from the test body mounting portion 11a of the plate body 11, and the thermal vacuum test is completed. To be done.

The test body 17 is not limited to a relatively small one such as an on-board device, but may be a large one such as a spacecraft body. In this case, the airtight container, the plate body, and the cylindrical body are configured to have a large diameter.

As described above, in the above-mentioned space chamber apparatus for thermal vacuum test, when liquefied nitrogen is supplied from the LN2 supply source to the plate body 11, the liquefied nitrogen is filled in the plate body 11 and the cylindrical body 12, and the hermetically sealed container 10 is closed. Is cooled to a thermal vacuum environment and the heaters 14 and 15 are driven to heat the plate body 11 and the cylindrical body 12, the liquefied nitrogen is vaporized to generate nitrogen gas, and the liquefied nitrogen is generated by the gas pressure. 11 and the tubular body 12 are configured to be discharged. According to this, it is possible to effectively secure a thermal vacuum environment with a simple configuration using only a necessary amount of liquefied nitrogen without providing a circulation means for circulating liquefied nitrogen as in the conventional case, and to reduce the size. Can be promoted.
In addition, in the said Example, although liquefied nitrogen was used as a refrigerant | coolant liquid, it is not restricted to this and can also be comprised using Freon.

Further, in the above-mentioned embodiment, the liquefied nitrogen is supplied to the plate body 11 through the hollow portion of the cylindrical body 12, but the present invention is not limited to this structure, and various configurations are possible. is there. Therefore, it is needless to say that the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the present invention.

[0016]

As described above, according to the present invention, it is possible to provide a space chamber apparatus for a thermal environment test, which has a simple structure and is capable of ensuring a thermal vacuum environment to promote miniaturization. Can be provided.

[Brief description of drawings]

FIG. 1 is a diagram showing a space chamber device for a thermal vacuum test according to an embodiment of the present invention.

FIG. 2 is a diagram showing details of a main part of FIG.

FIG. 3 is a diagram showing an operation state of FIG.

FIG. 4 is a diagram showing an operation state of FIG.

FIG. 5 is a view showing a conventional space chamber device for a thermal vacuum test.

[Explanation of symbols]

10 ... Airtight container, 11 ... Plate body, 11a ... Specimen mounting portion,
12 ... Cylindrical body, 13 ... Connection pipe, 14, 15 ... Heater, 16
… Gas exhaust valve, 17… Test body.

Claims (1)

[Claims] 1. A hollow cylindrical body arranged along a peripheral wall of a closed container kept in a vacuum environment, and a test body arranged at one end of the cylindrical body and communicating with the cylindrical body. A hollow plate body to be mounted, a coolant liquid supply means for supplying a coolant liquid to the plate body to fill the cylinder body, and a vaporized gas of the coolant liquid provided in the cylinder body selectively. A gas discharging means for discharging, and a refrigerant liquid discharging means for heating the cylinder body and the plate body to vaporize the filled refrigerant liquid and discharge the filled refrigerant liquid at the gas pressure of the generated gas. A space chamber device for thermal vacuum testing.