JPH0354099A - Two-phase fluid loop type heat control device - Google Patents

Abstract

PURPOSE:To simplify constitution, to reduce weight, to perform high reliable control for a long period by a method wherein working fluid on the delivery side and the suction side of a circulating pump are fed to an accumulator through control of first and second release valves, and through control of first and second pressure regulating valves, a two-phase fluid loop passage is pressurized and the pressure thereof is reduced by means of working liquid. CONSTITUTION:A two-phase fluid loop type heat control device feeds working fluid on the delivery side of a circulating pump 11 to an accumulator 12 through a release valve 18. Simultaneously, by reducing a pressure at the one end connected to a two-phase fluid loop passage 10 is controlled through a first pressure regulating valve 23, working liquid is discharged to the loop passage 10 to pressurize the loop passage 10. Working fluid on the suction side of the pump 11 is fed through an on-off valve 21, and by pressurizing a pressure at the one end connected to the loop passage 10 through control of a second pressure regulating valve 24, working liquid of the loop passage 10 flows in to reduce the pressure of the loop passage 10. Thus, loading of a consumption good on a space flying body can be reduced, weight is reduced, and high reliable control is realized for a long period.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a two-phase fluid loop type thermal control device used for thermal control of a space vehicle such as an artificial satellite.

(Prior art) In recent years, in the field of space development, space vehicles have become larger and the number of onboard equipment has been increasing. A two-phase fluid loop type thermal control device that realizes efficient exhaust heat by transporting heat has been considered. Such a two-phase fluid loop type thermal control device is characterized by being able to set the phase change temperature by controlling the pressure in the two-phase fluid loop path, making it easy to control the temperature of the installed equipment. have

Figure 2 shows such a two-phase fluid loop thermal control device. In the figure, 1 is a two-phase fluid loop installed in an on-board device (not shown), in which the working fluid flows in the direction of the arrow through a circulation bomb 2. It is transferred to perform heat transport. An accumulator 3 for pressure control is connected to the suction side of the circulation bomb 2 in the two-phase fluid loop path 1. The accumulator 3 stores hydraulic fluid separated into gas and liquid via a telescopic member 4 called, for example, a bellows, and one end of the hydraulic fluid inlet/output side communicates with the two-phase fluid loop path 1 .

A cylinder 5 for pressurized supply is connected to the gas side of the other end of the accumulator 3 via a gas supply pipe 6a, a pressurization valve 6b, and a manual adjustment valve 6C. Further, the other end of the accumulator 3 is connected via a discharge pipe 7a and a pressure reducing valve 7b (not shown) led to the outside of the spacecraft, and a pressure detector 8.
is provided. This pressure detector 8 is connected to a control section 9, and the output ends of this control section 9 are connected to the pressure increasing valve 6b and the pressure reducing valve 7.
connected to b.

In the above configuration, when the condensation temperature of the two-phase fluid loop path 1 decreases due to changes in the external environment and the evaporation temperature decreases to near the permissible temperature of the mounted equipment (not shown), the temperature detection unit (not shown) detects this, The detection signal is output to the control section 9. Then, the control unit 9 controls the pressurizing valve 6b in response to the detection signal, and supplies the gas from the cylinder 5 to the accumulator 3 via the gas supply pipe 6a. Here, the expandable member 4 of the accumulator 3 is compressed and contracted by the gas, and the working fluid is discharged into the two-phase fluid loop path 1. At this time, the pressure of the accumulator 3 is detected by the pressure detector 8, and when the desired pressure is reached, the pressurizing valve 6b and the regulating valve 6C are adjusted and controlled via the control unit 9, and the gas supply is cut off. Set to a predetermined value. As a result, the pressure of the two-phase fluid loop path 1 is increased, the heat transport efficiency is increased, and the thermal control characteristics are improved.

Furthermore, when the evaporation temperature rises due to external environmental conditions and approaches the permissible temperature of the onboard equipment (not shown), the temperature detection section (not shown) detects this again and sends a detection signal. It is output to the control section 9. Then, the control unit 9 controls the pressure reducing valve 7b with the pressurizing valve 6b closed, and discharges the gas in the accumulator 3 to the outside of the spacecraft via the exhaust pipe 7a. Here, when the gas pressure of the accumulator 3 is reduced, the expandable member 4 is expanded, and the working fluid of the two-phase fluid loop path 1 flows into the accumulator 3 . At this time, the pressure of the accumulator 3 is detected by the pressure detector 8, and when the desired pressure is reached, the control unit 9
The pressure reducing valve 7b is closed and set to a predetermined value via the pressure reducing valve 7b. As a result, the pressure of the two-phase fluid loop path 1 is lowered, the heat transport efficiency is lowered, and the thermal control characteristics are lowered.

Note that when the accumulator 3 is in operation, the manual adjustment valve 6C is set to an open state.

However, in the two-phase fluid loop thermal control device described above, the pressure control of the accumulator 3 is realized by supplying gas from the cylinder 5 or by discharging the gas to the outside of the spacecraft, so a large amount of gas is required. Therefore, it is heavy and difficult to use for a long period of time, and the gas in the accumulator 3 is discharged into space when the pressure is reduced.
When the gas is exhausted, the attitude control system may be adversely affected, resulting in a problem of low reliability.

(Problems to be Solved by the Invention) As described above, the conventional two-phase fluid loop thermal control device requires a large amount of pressurizing gas, is heavy, and is difficult to use for a long period of time. , there was a risk that the attitude control system would be adversely affected during depressurization, and the reliability was poor.

This invention was made in view of the above circumstances, and is a two-phase fluid that can simplify the structure, promote weight reduction, and realize highly reliable control over a long period of time. The purpose is to provide a loop type thermal control device.

[Structure of the Invention] (Means for Solving the Problems) The present invention provides a heat transport method in which a working fluid is circulated in a two-phase fluid loop path via a circulation bomb, and heat is transported using a phase change of the working fluid. means, an accumulator containing the working fluid and having one end communicated with a two-phase fluid loop path on the suction side of the circulation pump, and a two-phase fluid loop path on the discharge side of the circulation pump and the accumulator. a pressurizing passage communicating between the other ends; a first open valve provided in the pressurizing passage and guiding the hydraulic fluid on the discharge side of the two-stream fluid loop passage to the accumulator; and a first open valve on the suction side of the circulation bomb. a pressure reduction passage communicating between the two-phase fluid loop path and the other end of the accumulator; a first release valve provided in the pressure reduction passage for guiding the working fluid on the suction side of the two-phase fluid loop path to the accumulator; The first and second portions are provided downstream and upstream of the accumulator in the two-phase fluid loop path.
and the first pressure regulating valve is controlled in conjunction with the opening operation of the first release valve to reduce the pressure on one end side of the accumulator to reduce the pressure of the working fluid in the two-phase fluid loop path. and controlling the second pressure regulating valve in conjunction with the opening operation of the second release valve to reduce the pressure at one end of the accumulator to operate the two-phase fluid loop path. A two-phase fluid loop type thermal control device is constructed by including a control means for causing liquid to flow in.

(Function) According to the above configuration, the accumulator is supplied with the working fluid on the discharge side of the circulation bomb via the pressurizing passage while the first release valve is controlled and the first pressure regulating valve is controlled. When the pressure at one end side is reduced, the operating force flows out into the three-phase fluid loop path and pressurizes the two-phase fluid loop path. Further, the accumulator is supplied with the working fluid on the suction side of the circulation bomb through the pressure reduction passage by controlling the second release valve, and the pressure at one end of the accumulator is increased by controlling the second pressure regulating valve. When pressurized, hydraulic fluid in the two-phase fluid loop is admitted to reduce the pressure in the two-phase fluid loop.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows a two-phase fluid loop type thermal control device according to an embodiment of the present invention. In the figure, reference numeral 10 indicates a two-phase fluid loop path installed in an on-board device (not shown), in which the working fluid flows through a circulation bomb 11. is transferred in the direction of the arrow to perform heat transport. An accumulator 12 is provided on the suction side of the circulation bomb 11 in the two-phase fluid loop path 10 . In this accumulator 12, first and second telescopic members 14.15, which are connected by opening the shielding plate 13, are telescopically housed. Hydraulic fluid is stored in and out of the housing. Among them, the first telescopic member 14 is connected to the suction side of the circulation pump 11 of the two-phase fluid loop path 10, and the other second telescopic member 15 is connected to one end of the pressure control pipe 16. This pressure control tube 1
6 has a pressure detector 17 disposed in the middle part, and a pressurizing passage 18 connected to the discharge side of the circulation pump 11 of the two-phase fluid loop passage 10 at the other end, and a two-phase fluid loop passage 10. An intermediate portion between the suction side of the circulation pump 11 and the connecting portion of the accumulator 12 is communicated via a decompression passage 19 .

Open valves 20 and 21 are provided in intermediate portions of the heating passage 18 and the pressure reducing passage 19, respectively. These release valves 20
．． An output end of a control section 22 is connected to the control signal input end of 21, and an output end of the pressure detector is connected to the input end of the control section 22, and a temperature detection section (not shown) is connected to the input end of the control section 22.

Further, an accumulator 1 is provided in the Mikawa fluid loop path 10.
A first pressure regulating valve 23 is provided upstream of 2, and a second pressure regulating valve 24 is provided downstream thereof. These first and second pressure regulating valves 23 and 24 are connected to the control section 22.

In the above configuration, when the condensing temperature decreases and the evaporation temperature decreases to near the permissible temperature of the on-board equipment (not shown) due to a change in external environmental conditions, for example, the temperature sensor (not shown) detects this and the controller 22 detects this. Outputs an activation signal.

Then, the control unit 22 outputs an open signal to the open valve 20 to open it, and controls the first pressure regulating valve 23 to narrow it down to a predetermined position. This allows accumulator 1
2, the high-pressure working fluid on the discharge side of the circulation bomb 11 is passed through the pressurizing passage 18 and the pressure control pipe 16 to the second telescopic member 15.
is supplied to the side, and the shielding plate 13 is pressed. As a result, the pressure on the first extendable member 14 side is reduced, and the second extendable member 15 of the accumulator 12 is extended, the first extendable member 14 is contracted, and the working fluid is in two-phase state. is discharged into the fluid loop path 10 and the two-phase fluid loop path 1
The pressure of 0 is increased and the evaporation temperature is increased. Here, the control unit 22 controls the pressure of the accumulator 12 in accordance with the detected value of the pressure detector 17 to ensure a predetermined pressure in the two-phase fluid loop path 10.

In this case, the pressure of the hydraulic fluid supplied to the pressurizing passage 18 is adjusted and controlled by controlling the rotation speed of the circulation bomb 11.

Additionally, when the evaporation temperature rises and approaches the permissible temperature of the onboard equipment (not shown) due to changes in external environmental conditions, the temperature detector (not shown) detects this again. The signal is output to the control section 22. Then, the control unit 22 outputs an open signal to the open valve 21 to open it, and also opens the second valve.
The pressure regulating valve 24 is controlled to a predetermined position. As a result, the accumulator 12 is connected to the circulating bomb 11.
The low-pressure working fluid on the suction side is supplied from the second extensible member 15 side via one pressure passage and the pressure control pipe 16.

As a result, the pressure on the first elastic member 14 side causes the accumulator to move toward the shielding plate 13 from the first elastic member 14 side.
is pressed to extend the first elongated member 14, and at the same time, the second elongated member 15 is contracted, allowing the hydraulic fluid of the Futagawa fluid loop path 10 to flow into the first elongated member 14. , the pressure in the Futagawa fluid loop path 10 is reduced, and the evaporation temperature is lowered. Here, the control unit 22 controls the pressure of the accumulator 12 in accordance with the detected value of the pressure detector 17,
A predetermined pressure is ensured in the two-phase fluid loop path 10.

In this manner, the two-phase fluid loop type thermal control device supplies the accumulator 12 with the working fluid on the discharge side of the circulation pump 11 via the open valve 18, and also supplies one end of the accumulator 12 with the working fluid on the discharge side of the circulation pump 11 connected to the two-phase fluid loop path 10. The pressure is adjusted by the first pressure regulating valve 23
The hydraulic fluid discharges into the two-phase fluid loop path 10 by controlling the pressure reduction through the two-phase fluid loop path 10.
and supplies the working fluid on the suction side of the circulation bomb 11 via the open valve 21, and the pressure at one end connected to the two-phase fluid loop path 10 is controlled by the second pressure regulating valve 2.
By controlling and pressurizing 4, the two-phase fluid loop path 1
0 hydraulic fluid flows in to increase the pressure in the two-phase fluid loop path 10.

According to this, it becomes possible to realize pressure control of the accumulator 12 without using consumables such as pressurizing gas as in the past, making it easier to install consumables on the Uichi aircraft. Since the weight can be reduced, weight reduction can be promoted as much as possible, and highly reliable control over a long period of time can be realized.

In the above embodiment, the first pressure regulating valve 23 is provided on the upstream side near the connecting portion with the accumulator 12 on the suction side of the circulation bomb 11, but the present invention is not limited to this. It is also possible to configure it so that it is provided in the two-phase fluid loop path 10 on the upstream side of the circulation bomb 12, for example, on the discharge side of the circulation bomb 11.

Therefore, it goes without saying that the present invention is not limited to the above embodiments, and that various modifications can be made without departing from the spirit of the invention.

[Effects of the Invention] As described in detail above, according to the present invention, the structure of the two-channel system can be simplified, weight reduction can be promoted, and highly reliable control can be realized over a long period of time. A fluid loop thermal control device can be provided.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram showing a two-phase fluid loop type thermal control device according to an embodiment of the present invention, and FIG. 2 is a configuration diagram showing a conventional two-phase fluid loop type thermal control device. 10... Two-phase fluid loop path, 11... Circulation bomb,
12... Accumulator, 13... Shielding plate, 14,
15... First and second telescopic members, 16... Pressure control tube, 17... Pressure detector, 18... Pressurizing passage, 1
9... Pressure reduction passage, 20.21... Release valve, 22...
- Control unit, 23.24... first and second pressure regulating valves.

Claims (1)

[Scope of Claims] A heat transport means that circulates a working fluid in a two-phase fluid loop path via a circulation pump and transports heat by utilizing a phase change of the working fluid, and the working fluid is housed therein. an accumulator having one end communicating with a two-phase fluid loop path on the suction side of the circulation pump; and a pressurizing passage communicating between the two-phase fluid loop path on the discharge side of the circulation pump and the other end of the accumulator. , a first open valve provided in the pressurizing passage and guiding the working fluid on the discharge side of the two-phase fluid loop path to the accumulator; and a two-phase fluid loop path on the suction side of the circulation pump and the other parts of the accumulator. a pressure reduction passage that communicates between the two ends; a first open valve that is provided in the pressure reduction passage and guides the working fluid on the suction side of the two-phase fluid loop path to the accumulator; and first and second pressure regulating valves provided on the upstream side; and controlling the first pressure regulating valve in conjunction with the opening operation of the first opening valve to reduce the pressure on one end side of the accumulator. to cause the working fluid in the two-phase fluid loop path to flow in, and to reduce the pressure at one end of the accumulator by controlling the second pressure regulating valve in conjunction with the opening operation of the second release valve. a two-phase fluid loop thermal control device, comprising: a control means for causing a working fluid to flow into the two-phase fluid loop path.