JPH06199300A - Cold plate - Google Patents

Abstract

PURPOSE:To prevent pressure loss from increasing even if the mounting area is increased in a cold plate of swirl type for equipment mounted on space system by connecting a annular outer circumferential part header to a central header by means of a plurality of swirl pipes being apart in the circumferential direction. CONSTITUTION:Inlets in which coolant flows are arranged to project downwards at an equal interval in the circumferenctial direction on an annular outer circumferential header 1 made of copper, etc., having good heat conductive characteristic. Swirl type pipes 3 shaped in the form of circle in section and curved spirally centering the center from the inner circumferential face in the vicinity of the inlets is connected integratedly to the header 1. The fore end of each swirl pipe 3 is connected integratedly to the outer circumferential face of a disc- shaped central header 4 arranged at the center of the outer header 1. To the central header 4 a large dia. outlet 5 for flowing out coolant is arranged to project downwards. A face sheet 6 made of cupper or the like is adhered to the circumferential face of the central header 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a swirl cold used for absorbing heat generated by an onboard device in a two-phase fluid loop type thermal control system for maintaining the temperature of the onboard device of a spacecraft within an allowable range. Regarding the plate.

[0002]

2. Description of the Related Art In recent years, with the increase in size of spacecraft, the required power and power consumption of the spacecraft have increased, and the amount of heat generated has also increased significantly. Has come to be required. Therefore, a heat control system by a two-phase fluid loop is used which enables a large amount of heat treatment (endothermic, heat transport, heat dissipation) with a small amount of refrigerant by utilizing latent heat of the refrigerant.

The heat control system using the two-phase fluid loop changes (evaporates) all or part of the refrigerant from the liquid phase to the gas phase in the refrigerant flow path of the heat absorber in which the heat generating device is mounted, and A liquid two-phase or vapor fluid is introduced to a radiator (radiator) via piping, and the fluid that has undergone phase change (condensation) to the liquid phase by heat radiation from the radiator is returned to the heat absorber via piping. Has been done.

Conventionally, a swirl cold plate has been known as a microgravity-compatible heat absorber in a thermal control system using a two-phase fluid loop of this type (Japanese Patent Laid-Open No. HEI 3-301).
54098).

As shown in FIGS. 3 and 4, this swirl type cold plate is constructed by interposing spiral refrigerant pipes 22 between two heat transfer plates 21 in contact with the respective inner surfaces thereof. , While separating the refrigerant into gas and liquid by centrifugal force,
It is intended to promote heat transfer under microgravity by generating a unique secondary flow in a cross section perpendicular to the flow direction.

3 and 4, 23 and 24 are the inlet and outlet of the refrigerant pipe 22, and 25 and 2 in FIG.
Reference numeral 6 denotes a circular plate-shaped outer peripheral portion spacer and a central portion spacer that are interposed between the heat transfer plates 21 and are provided with notches that allow the inlet 23 and the outlet 24 of the refrigerant pipe 22 to be inserted. Two
The refrigerant pipe 22 is prevented from being excessively pinched when connecting one to the other.

[0007]

In this conventional swirl type cold plate, the refrigerant pipe serving as the refrigerant passage is
Since a single pipe is formed by spirally winding it, the larger the cold plate is, the longer the flow path of the spiral pipe becomes, resulting in a significant increase in pressure loss when the refrigerant passes.

[0008] Therefore, an object of the present invention is to provide a cold plate that does not cause an increase in pressure loss in the flow path even if the mounting area of the mounted equipment increases.

[0009]

In order to solve the above-mentioned problems, the cold plate of the present invention has a disk-shaped outer peripheral portion header and a disk-shaped central portion header arranged at the center thereof. They are connected by a plurality of spiral tubes which are appropriately separated in the direction.

[0010]

In the above means, the flow path of the spiral tube connecting the outer peripheral header and the inner peripheral header is shortened.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings.

1 and 2 are a plan view and a sectional view of a swirl cold plate according to an embodiment of the present invention.

A plurality of (4 in the embodiment) inlets 2 into which a refrigerant flows are provided at equal intervals in the circumferential direction in a disk-shaped outer peripheral header 1 made of copper, aluminum or the like having excellent thermal conductivity. A spiral tube 3 having a circular cross section, which is spaced apart and protrudes downward, is curved in a spiral shape from the inner peripheral surface near each inlet 2 toward the center, is integrally connected. The tip end of each spiral tube 3 is integrally connected to the outer peripheral surface of a disk-shaped central header 4 arranged in the central portion of the outer peripheral header 1. A relatively large-diameter outlet 5 through which the refrigerant flows is provided so as to project downward.

In FIG. 2, reference numeral 6 denotes a face sheet attached to both surfaces of the outer peripheral header 1, the spiral tube 3 and the central header 4, and is made of copper or the like having excellent heat conductivity.

The swirl cold plate having the above-mentioned structure is mounted on a frame (not shown), and a heat generating device (not shown) of a spacecraft is mounted on the upper surface thereof.

[0016]

As described above, according to the cold plate of the present invention, the flow path of the spiral tube that connects the outer peripheral header and the central header becomes significantly shorter than that of the conventional one, so that the mounted equipment Even if the mounting area of the coil is increased, it is possible to prevent an increase in the pressure loss of the flow path by selecting the number of spiral tubes appropriately, and it is possible to meet the mounting surface size of the mounted equipment, the heat absorption capacity, and the cold loss corresponding to the pressure loss requirement. There is an effect that a plate can be obtained.

[Brief description of drawings]

FIG. 1 is a plan view of a cold plate according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line II-II in FIG.

FIG. 3 is a plan view of a conventional cold plate.

4 is a sectional view taken along line IV-IV in FIG.

[Explanation of symbols]

 1 Outer header 2 Inlet 3 Swirl tube 4 Center header 5 Outlet

Claims (1)

[Claims] 1. A circular disc-shaped outer peripheral portion header and a disc-shaped central portion header arranged at the center thereof are connected by a plurality of spiral tubes which are appropriately separated in the circumferential direction. And cold plate.