JPS59125070A - Pitot tube - Google Patents

Abstract

PURPOSE:To use a titled Pitot tube very easily and to derive a flow velocity, etc. of a fluid by constituting it of a heat pipe, a full pressure tube and a static pressure tube. CONSTITUTION:One end 1A of a heat pipe 1 which is bent in the shape of L is an evaporating part, and the other end 1B is a condensing part. A wick 2 consisting of a metallic net, a sintered metal, or a group, etc. is formed on the inside circumferential surface of the cylindrical heat pipe 1. A full pressure tube 4 passes through in the axial core direction of the heat pipe 1, its tip 4A is opened to the evaporating part end face of one end 1A of the heat pipe 1, and its rear end 4B is led out of the condensing part of the other end 1B of the heat pipe 1. The tip 5A of a pair of static pressure tubes 5 is opened at a position of 180 deg. of the evaporating part side face of one end 1A of the heat pipe 1, and the rear end 5B passes through the inside of the heat pipe 1 and is led out of the condensing part of the other end 1B. The full pressure tube 4 and the static pressure tube 5 are formed so as to be contained in this heat pipe 1, therefore, they are not heated themselves and the full pressure and the static pressure can be led out.

Description

[Detailed description of the invention] Ru.

When measuring the flow velocity and direction of fluid. Pitot tubes are commonly used. A pitot tube usually has 3 or 5 holes.
It has holes, for example, one of the holes faces the flow direction to introduce total pressure and the other hole introduces static pressure, and that pressure is guided to a differential pressure gauge such as a manometer through a total pressure pipe and a static pressure pipe. , flow velocity, etc.

When measuring a high temperature flow such as combustion exhaust gas as a fluid. It is necessary to cool the total pressure tube and the static pressure tube, and conventionally water-cooled pipes have been used.

However, water supply and drainage equipment is required for water cooling.
The pitot tube, which should be easy to use, was also troublesome to handle.

The pitot tube of the present invention is. A heat pipe that is cylindrical in shape and has an evaporation section at one end and a condensation section at the other end, and a heat pipe that penetrates in the axial direction of the heat pipe and has a tip opening at the end surface of the evaporation section at one end of the heat pipe and a rear end of the heat pipe. and a total pressure pipe led out from the condensing section at the other end.

It consists of a static pressure tube whose tip opens on the side of the evaporating section of the heat pipe, and whose rear end passes through the inside of the heat pipe and is led out from the condensing section at the other end, so it is extremely easy to use and can be used to determine the flow velocity of fluid, etc. You will be able to do this.

The present invention will be explained below using an embodiment of a pitot tube shown in FIG.

In the figure, 1 is a heat pipe bent into an L-shape, with one end IA serving as an evaporating part and the other end @IB serving as a condensing part. A wick 2 made of metal net, sintered metal, or group is formed on the inner peripheral surface of the cylindrical heat pipe, and the wick 2 is appropriately selected from water, alcohol, sodium, freon, etc. depending on the operating temperature. The working liquid 3 moves within the wick 2 by capillary action.

Reference numeral 4 denotes a full-pressure tube that penetrates the heat pipe 1 in the axial direction, with its tip 4A opening at the end face of the evaporator section of the heat pipe 1 at one end IA, and its rear end 4B opening at the end surface of the IB condensing section at the other end of the heat pipe 1. ' 5 is a pair of static pressure tubes, the tip 5A of which opens at a position 180 degrees from the side of the evaporation part 15 of the heat pipe 1, and the rear end 5B passes through the inside of the heat pipe 1. It is led out from the end IB condensing section.

The total pressure pipe 4 and the static pressure pipe 5 are connected to a differential pressure gauge such as a manometer (not shown).

Reference numeral 6 denotes a heat dissipation fin attached to the outer periphery of the condensing section at the other end of the exhaust pipe 1.

Now, the pitot tube thus formed is inserted into the exhaust gas flue, but the IB condensing section on the other side of the heat pipe 1 is placed outside the flue.

When the heat pipe 1 is heated by gas, the working fluid 3 sealed inside evaporates and removes heat.

The evaporation flows to the other end of the heat pipe 1 IB condensing section,
The heat is dissipated through the heat dissipation fins 6 and liquefied. Note that the liquefied working fluid 3 moves within the wick 2 and returns to the evaporation section, and this cycle is repeated. Therefore, the heat pipe 1 is dissipating endless heat and is self-cooling.

Since the total pressure tube 4 and the static pressure tube 5 are housed within the heat pipe 1, they can derive the total pressure and static pressure without being heated themselves.

Thus, according to the Pitot tube of this embodiment.

Since there is no need to use cooling water, there is no need for water piping, water, etc., and it is possible to measure the flow velocity of high temperature fluid without making any special preparations.In the above example, the heat pipe 1 Although the wick 2 is formed only on the inner surface of the tube, it is of course possible to form the wick on the outer surface of the total pressure tube 4 and the static pressure tube 5 as well.

In addition, on the outer periphery of the heat pipe 1, where the heat flow is particularly large,
A heat insulating material or the like may be placed.

[Brief explanation of the drawing]

FIG. 1 is a diagram of a pitot tube showing one embodiment of the present invention. 2: Wisoku, 3: Operating liquid, 4: Full pressure pipe. 5: Static pressure tube, 6: Fin

Claims (1)

[Claims] A heat pipe that is cylindrical in shape and has an evaporation section at one end and a condensation section at the other end, and a heat pipe that penetrates in the axial direction of the heat pipe, with the tip opening at the end surface of the evaporation section at one end of the heat pipe, and the rear end at the other end of the heat pipe. A pitot tube consisting of a total pressure tube led out from a condensing section, and a static pressure tube whose tip opens on the side of the evaporation section at one end of the heat pipe, and whose rear end passes inside the heat pipe and leads out from the condensing section at the other end. .