JPH02500230A - Heat exchanger equipment for electrical elements - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] Heater equipment for 11 positions ±1 FIELD OF THE INVENTION The present invention relates generally to heat dissipation means for electrical components, and in particular to aircraft or navigational components. For electrical elements that can resist zero gravity or inversion in applications such as aerospace. The present invention relates to a heat exchanger device.

91L1 dispatch It is common practice to cool elements that generate a moderate amount of heat to dissipate the heat. be. For example, an electrical element that generates a moderate amount of heat can be isolated by a gaseous insulator. Can be mounted in an enclosed metal container 0 Heat generated is transferred to the surrounding air and conducted by a metal container.

However, elements that generate significant amounts of heat may be requires a dielectric liquid to conduct, such as through a housing.

If a dielectric liquid coolant is required, thermal expansion of the liquid within the container must be allowed for. Must be. If the container is simply parted to provide space for the dielectric liquid coolant to expand, If partially filled, voids or cavities within the coolant are hot spots or Electrical disconnection may occur. This issue was addressed by Wittmann on January 8, 1957. (Mhit+*an), U.S. Patent No. 2,777.009. It has been proposed in various ways, such as the one given by

At Wittmann, electrical equipment is submerged in a dielectric liquid in a sealed main tank. , there is a non-condensable gas above the dielectric liquid. Gas tanks contain non-condensable gases and equipment. located in the main tank to separate the dielectric liquid vapors formed during the operation of the There is. The gas tank has an opening at the top, and the bottom of the gas tank is in contact with the dielectric liquid. Ru. The side walls of the two tanks are narrowly separated, inside which the dielectric liquid vapor is During operation, non-condensable gas rises continuously during operation, and at the same time non-condensable gas blows into the space inside the gas tank. It condenses while rising.

Known methods, generally described above for the Wittmann patent, As long as there is sufficient gravity to hold the dielectric liquid at the bottom of the tank and the tank is As long as it remains the same, it is operationally functional. However, such a method The tank becomes inverted or zero as in aerospace applications. At 0°G, which is not applicable when subjected to gravity, the dielectric liquid has no electric charge. The electrical element can be completely lifted off the electrical element and disconnected in a matter of seconds. like this Such a situation may be experienced, for example, when an aircraft suddenly drops through space. mosquito There is an obvious need for heat exchanger equipment for electrical elements used in such applications. There is sex.

The present invention solves the above problems and addresses the need for a heat exchanger device of the characteristics described. It is directed toward satisfaction.

Brief description of the drawing The features of the invention believed to be novel are pointed out with particularity in the appended claims. The present invention, together with its objects and advantages, refers to the following description taken in conjunction with the accompanying drawings. can best be understood with reference to

It should be noted that like reference numerals identify like elements throughout the figures. In the figure, FIG. 1 is a somewhat schematic vertical section through a heat exchanger apparatus embodying the concepts of the present invention; is a diagram; and FIG. 2 shows the finned outer surface of the main chamber of the heat exchanger device.

FIG. 3 is another embodiment of the invention.

Suitable for t. Referring in detail to the figures, and initially to FIG. That is, at the bottom of the tank 16, dielectric liquid (a dielectric liquid) 1 4, generally indicated at 10, for dissipating heat from an electrical element 12 submerged within It is shown here in the form of a heat exchanger device. The tank 16 is sealed, Devices constructed from heat-dissipating materials such as metals may be on the order of 3/4" to 1" in diameter. It is designed to accommodate a type of electrical element, such as a silicone chip. Ru. The element is high output and square special table Hei 2-500230 (3) It may be on the order of 30-50 watts per centimeter (cm'). Several Silicone chips or devices can be organized into modules. In other words , the electrical elements to which the present invention is applicable are those in which a large amount of heat must be dissipated. be.

The device is shown in an upright position in FIG. However, the present invention Atmospheric and Directed to conditions that may be encountered in outer space applications. in such a state At first, dielectric liquid 14 is removed from electrical element 12, such as the silicone device described above. If so, the device will actually burn out in no time. zero gravity, such as in an inverted state, or during an aircraft's descent through space. It is designed to last about 15 seconds.

The dielectric fluid 14 is shown at 18 in FIG. The vapor bubbles 20 are shown to be boiling, forming vapor bubbles 20. turns into steam and rises in the direction of arrow "A". The dielectric liquid is under the trade name Fluoriner. ) (Fluorinert) manufactured by 3M Shokai. It may be in the form of Freon. The dielectric liquid is It is predicted that it can have a boiling point of 100°C with a vapor pressure of 0.6 psi. be done.

The present invention maintains a non-condensable gas, such as nitrogen, and during operation of the heat exchanger with the gas. The main chamber 16 is sealed in order to separate the vapor of the dielectric liquid that is formed. It is intended to provide means in the form of a disturbance chamber 22. It can be seen in Figure 1. In other words, the interference chamber 22 is located in the main chamber 16 in contact with the dielectric liquid 14 at the top thereof. be placed. The side walls of the two chambers may be cylindrical, for example, and around them spaced apart from each other to form narrow condensation and separation duct means 24; 9 In normal operation, the dielectric liquid vapor rises and condenses in the upper part of the duct means. The region is filled with non-condensable gas.

A small hole or orifice 26 is located near the upper wall 28 of the sealed obstruction chamber 22. It is formed virtually through it. This orifice allows non-condensed gas to enter the duct. Allowing the non-condensable gas to enter the obstruction chamber as it is blown up stage 24, but What dielectric liquid will enter if the position is reversed or subjected to zero gravity? It's so big that it's prohibited to even watch it. The orifice must be designed to prevent entry of dielectric liquid. It can be on the order of 0.010 inch.

This will allow the device to withstand reversed conditions for as long as 15 seconds. cormorant.

Another problem encountered with boiling liquids is low vapor pressure, or very low vapor density. be. Therefore.

The present invention generally refers to "geyser eruptions or geysering". The device is sealed to avoid extremely rapid or volatile boiling, called It is intended to pre-fill the disturbed disturbance chamber 22 to a given pressure level. It is illustrated. This in itself can create a condition of burnout of the electrical element. Device The amount or degree of precharging will depend on the dielectric liquid being used. .

Simply put, the system requires that the boiling point of the liquid reach a predetermined charging pressure. It is pre-charged to create a non-existent condition. Of course, in front of interference room 22. By filling the orifice 26 with air above the condensed vapor. The duct means 24 around the upper region of the disturbance chamber are also prefilled.

Any liquid that condenses on or around the upper wall 28 of the obstruction chamber 22 will Means are provided for returning the liquid to the bottom of the main chamber 16. Specifically, if the chimney shape A funnel-shaped passage 3o is formed through the obstruction chamber, and the liquid at the bottom of the main chamber is It is directed to a small liquid passage port 32 at the bottom of the passageway, which communicates with the body's reservoir.

Air impingement means, generally indicated at 34, also direct cooling air into the sealed main chamber 16. around the sealed main chamber 16 for orientation. For air collision means , a cooling air inlet 38 and a warm air outlet 40.

FIG. 2 shows that cooling fins 42 are also provided outside the main chamber 16 to facilitate heat dissipation. The fins, shown to be able to be kicked, may be spaced apart on the order of 3 to 6 inches for cleaning purposes.

As mentioned in the figure legends, the invention is shown here somewhat diagrammatically. . The sealed, metal-sealed main chamber 16 is fitted with some type or other lower support means ( ) and the air impingement means 34 must be supported by It will be appreciated that it is clear that the support is adequate around 16 . However, the air impingement means 34 has an open end 44 through which the air impingement means 34 can pass through the main chamber. It should be noted that 16 can be placed. This means that the main room is Allows for easy removal for purposes. This means that the air inside the aircraft exchanges heat. Especially in aircraft applications where it is often used as cooling air in 0 Cabin air is free of residue build-up and resulting cigarette smoke or similar As a result, there is a need to facilitate cleaning of the equipment's heat exchanger surfaces. arise.

FIG. 3 is directed to a cross-sectional view of another embodiment of the invention. The present invention shown in FIG. The embodiment includes a disturbance chamber 5 containing connected tubes 51 as shown on the left hand side of the figure. It is characterized by using 0. The upper end of the tube 51 has an orifice shown in FIG. There is a small orifice 52 that acts in the same manner as the gas 26.

The third zone heat exchanger includes an electrical element 53,54 submerged in a dielectric liquid 55. Ru. A sealed main chamber 56 contains a dielectric liquid 55 and non-condensable gases on a surface 57 of the liquid 55. Established to hold.

The obstruction chamber 50 provides an enclosed space for non-condensable gases to form during operation of the heat exchanger. It acts to separate gas and vapor from the liquid produced. It is easy to notice in Figure 3. As can be seen, the interference chamber 50 is placed within the main chamber 56 and in contact with the dielectric liquid 55. Side walls 58,59 shown spaced apart provide narrow condensation and separation duct means. formation, within which liquid vapor rises and condenses. Orifice 52 of tube 51 is located near the top of the heat exchanger main chamber 56. The orifice 52 is a gas duct. allowing non-condensable gas to enter the obstruction chamber 50 when the means is blown up; and prevents liquid from entering if the device is inverted or subjected to zero gravity. It is large enough to prevent it.

This embodiment of the invention is provided with a fan 60 as shown and Fan 60 directs cooling air to the outer ring as shown by arrows 61,62. upwardly through passageway 63 and then as indicated by arrows 65.66. through the inner annular passage 64 and then through the flap as shown. Fan 60 expels warm air. Although not shown, heat is released between the walls 58 and 59. A fin structure may be located and, as already explained, the steam in the duct means and the air drawn through the heat exchanger.

The invention may be embodied in other specific forms without departing from its spirit or central characteristics. As will be understood, this example and the examples are intended to be used in all respects. should be considered descriptive and restrictive in that respect. rather, and the invention should not be limited to the details given herein.

Translation of written amendment submitted (Article 184-7, Paragraph 1 of the Patent Act) April 19, 1999

Claims (1)

[Claims] 1. A heat exchanger device for an electrical element submerged in a dielectric liquid, the device comprising: a sealed main chamber containing said dielectric liquid and a non-condensable gas above said dielectric liquid; Main room partitioning means for partitioning; said non-condensable gas and is formed with said gas during operation of said heat exchanger. Disturbance chamber partitioning means for partitioning the disturbance chamber so as to separate the disturbance chamber from the vapor of the dielectric liquid, The interference chamber is located within the main chamber in contact with the dielectric liquid, and is located on the side of the interference chamber and the main chamber. The wall has a narrow condensation and separation duct within which the dielectric liquid vapor rises and condenses. said obstruction chamber partitioning means being spaced apart from each other to form steps; orifice means provided in the disturbance chamber near the top of the disturbance chamber, the non-condensing When the non-condensable gas is blown up the duct means, the non-condensable column gas enters the obstruction chamber. allow inflow, but the heat exchanger device is inverted or subjected to zero gravity. said orifice means being dimensioned to prohibit the inflow of dielectric liquid in some cases; Heat exchanger device for electrical elements equipped. 2. Air impingement devices are placed around the sealed main room to direct cooling air towards the sealed main room. A heat exchanger arrangement for an electrical element according to claim 1, comprising stages. 3. The electrical component according to claim 2, further comprising cooling fin means outside the main chamber. heat exchanger equipment for 4. The electric component according to claim 1, which includes cooling fin means on the outside of the main chamber. heat exchanger equipment for 5. The obstruction chamber has a top wall and is adapted to position the orifice means on the top wall. A heat exchanger device for an electrical element according to claim 1. 6. a disturbance chamber for returning dielectric liquid condensed at the top of the disturbance chamber to the bottom of the main chamber; a passage means extending from the top wall of the block through the blockage chamber to the bottom of the blockage chamber; A heat exchanger device for an electrical element according to claim 5. 7. The passage means is funnel-shaped and includes a small liquid passage opening at its bottom. A heat exchanger device for an electrical element according to claim 6. 8. a disturbance chamber for returning dielectric liquid condensed at the top of the disturbance chamber to the bottom of the main chamber; a passage means extending from the top wall of the block through the blockage chamber to the bottom of the blockage chamber; A heat exchanger device for an electrical element according to claim 1. 9. The passage means is funnel-shaped and includes a small liquid passage opening at its bottom. A heat exchanger device for an electrical element according to claim 8. 10. A heat exchanger device for an electrical element submerged in a dielectric liquid, the device comprising: a sealed main chamber containing said dielectric liquid and a non-condensable gas above said dielectric liquid; Main room partitioning means for partitioning; said non-condensable gas and is formed with said gas during operation of said heat exchanger. Disturbance chamber partitioning means for partitioning the disturbance chamber so as to separate the disturbance chamber from the vapor of the dielectric liquid, The interference chamber is located within the main chamber in contact with the dielectric liquid, and is located on the side of the interference chamber and the main chamber. The wall has a narrow condensation and separation duct within which the dielectric liquid vapor rises and condenses. said obstruction chamber partitioning means being spaced apart from each other to form steps; orifice means provided in the disturbance chamber near the top of the disturbance chamber, the non-condensing When non-condensable gas is blown up said duct means, said non-condensable gas enters said obstruction chamber. allow inflow, but the heat exchanger device is inverted or subjected to zero gravity. said orifice means being dimensioned to prohibit the inflow of dielectric liquid if the the top of the disturbance chamber to return the dielectric liquid condensed at the top of the disturbance chamber to the presiding bottom; passage means extending from the wall through the obstruction chamber to the bottom of the obstruction chamber; an air space provided around the sealed main room to direct cooling air toward the sealed main room; A heat exchanger device for an electrical element with air impingement means. 11. The electrical appliance according to claim 10, further comprising cooling fin means outside the main chamber. Heat exchanger device for air elements. 12. The orifice means may be located in the top wall of the obstruction chamber. 11. A heat exchanger device for an electrical element according to claim 10. 13. The passage means is funnel-shaped and includes a small liquid passage opening at the bottom thereof. A heat exchanger device for an electrical element according to claim 10.