JPH0680075A - In-fluid-traveling device - Google Patents

Abstract

PURPOSE:To provide an in-fluid traveling device used for a micromachine which has a simple structure and is produced easily, by incorporating a pressurizer comprising a displacement element and the like inside a hollow casing, and incorporated an inflow side valve and an exhaust side valve inside an inflow port and an exhaust port respectively on both ends of the casing. CONSTITUTION:An inflow side valve 3 which opens when fluid pressure in the inner chamber 11 of a casing 1 is not higher than an outer fluid pressure is provided in an inflow port 21 for the fluid located in an inflow side bracket 2 which is provided on one end of the hollow cylindrical casing 1. And also an exhaust valve 5 that opens when fluid pressure in the inner chamber 11 is not less than the outer fluid pressure is provided in an exhaust port 41 for the fluid-located in the exhaust side bracket 4 on the other end. Then an opening 12 in the side face of the casing 1 is blocked by a diaphragm 6 which respouds to pulses so as to fix an displacement element 7 formed by laminating piezoelectric elements to the outer side of the diaphragm 6. Voltage is applied to the displacement element 7 to cause its extension/contraction so that the inner chamber of the diaphragm 6 is swelled outside or inside and jetting of the fluid from the exhaust port 41 allows the traveling device 10 to move.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluid moving device incorporated in a micromachine for inspecting a pipe or tank filled with fluid.

[0002]

2. Description of the Related Art Conventionally, as a propulsion mechanism for moving a micromachine for inspecting a fluid-filled pipe or tank, there are a propeller rotating mechanism and an electromagnetic pump type propulsion mechanism used for propelling a ship.

[0003]

However, the inner diameter is 1c.
In a micromachine that moves in a pipe as thin as about m, in order to manufacture a micromotor and a small propeller for driving a propeller, extremely precise and complicated machining steps are required, and the structure becomes complicated. was there. In addition, the electromagnetic pump type propulsion mechanism also has a drawback that it requires a large-capacity exciting device for passing a magnetic flux in the fluid, and it is difficult to incorporate it in a micromachine. It is an object of the present invention to provide an in-fluid moving device for a micromachine, which has a simple structure and is easy to manufacture.

[0004]

According to the present invention, there is provided a hollow casing having an inner chamber for introducing a fluid, an inlet provided at one end of the casing, and an inlet provided at the inlet. An inflow valve that opens only when the fluid pressure is lower than the external fluid pressure, a jet port provided at the other end of the casing, and a fluid pressure of the internal chamber that is provided at the jet port and is higher than the external fluid pressure. The in-fluid moving device includes a jet valve that opens only when the temperature is high and a pressure device that changes the pressure of the fluid introduced into the inner chamber.

[0005]

The moving device includes a pressure device for changing the pressure of the inner chamber of the hollow casing, and an inflow side valve that opens only when the fluid pressure of the inner chamber provided at one end of the casing is lower than the fluid pressure of the outside. , And an ejection side valve that opens only when the fluid pressure in the inner chamber provided at the other end is higher than the fluid pressure outside. A pressure device lowers the pressure in the inner chamber to open the inflow side valve to introduce the fluid into the inner chamber, and then a pressure device increases the pressure in the inner chamber to open the ejection side valve to inject the fluid in the inner chamber. Eject from the exit. The fluid ejected from the ejection port causes a thrust to act on the moving device to move. .

[0006]

Embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a side sectional view showing a first embodiment of the present invention. A moving device 10 includes a hollow cylindrical casing 1 and a casing 1.
An inflow side bracket 2 provided at one end and an ejection side bracket 4 provided at the other end are provided. The inflow side bracket 2 is provided with a fluid inflow port 21, and the inflow side valve 3 is provided in the inflow side 21 to open only when the fluid pressure in the inner chamber 11 of the casing 1 is lower than the external fluid pressure. The jet bracket 41 is provided with a fluid spout 41, and the spout 41
Is provided with a jet side valve 5 that opens only when the fluid pressure in the inner chamber 11 of the casing 1 is higher than the fluid pressure outside. An opening 12 is provided on a side surface of the casing 1, and the opening 12 is closed by a diaphragm 6 that responds to a pulse of several hundreds Hz as used in a piezoelectric speaker or the like, and the periphery of the diaphragm 6 is fixed to the casing 1. There is. On the outside of the diaphragm 6, one end of a displacement element 7 formed by stacking piezoelectric elements is fixed, and the other end of the displacement element 7 is fixed to a support frame 8 fixed to the side surface of the casing 1 across the diaphragm 6. There is. When the moving device 10 is moved in the fluid, a voltage is applied to the displacement element 7 to expand and contract, and the diaphragm 6 is inflated outside and inside the inner chamber 11.
As shown in FIG. 1, when the diaphragm 6 bulges outward,
The pressure of the inner chamber 11 of the casing 1 becomes low, the inflow valve 3 opens, and the fluid flows in from the inflow port 21. As shown in FIG. 2, when the diaphragm 6 bulges inward, the inner chamber 11
Becomes high, the ejection side valve 5 opens and the ejection port 41
Fluid spurts out from. The ejected fluid causes a thrust to act on the moving device 10 to move. By applying a pulsed voltage of 200 Hz to the displacement element composed of the piezoelectric element of this example, the in-fluid moving device could be moved in water. The moving direction can be changed by attaching a rudder device (not shown) for changing the traveling direction in the up-down direction and the left-right direction to the moving device 10. Further, in the above embodiment, the case where the displacement element is configured by the laminated piezoelectric element has been described, but the displacement element is not limited to this, and a magnetostrictive element combined with a laminated actuator eater or an electromagnetic coil using an electrostrictive material is used. It is obvious that the same effect as the above embodiment can be obtained by using the actuator eater. Further, the diaphragm 6 may be formed integrally with the casing 1 made of an elastic material.

FIG. 3 is a side sectional view showing a second embodiment, and FIG.
In the front cross-sectional view, four moving devices 20 are fixed to the upper, lower, left, and right side surfaces of the central moving device 10, and the ejection ports 41 ′ of the moving devices 20 fixed to each side face are ejected by the central moving device 10. The outlets 41 ′ are oriented in the direction perpendicular to the direction in which the outlets 41 are opened, and the respective outlets 41 ′ are oriented in the four directions of the central moving device 10 in the vertical and horizontal directions. When changing the moving direction of the central moving device 10, the fluid is ejected from the ejection port 41 ′ of the moving device 20 fixed to the side surface opposite to the moving direction. Then, the fluid ejected from the ejection port 41 'exerts a thrust force in a direction perpendicular to the traveling direction of the central moving device 10,
The mobile device can change direction. FIG. 5 is a side sectional view of a moving device 30 showing a third embodiment. Instead of the diaphragm 6 provided in the hollow cylindrical casing 1 of the moving device 10 described in the first embodiment, a casing 1 The heater 9 is fixed inside. When the moving device 30 is moved, a fluid is introduced into the inner chamber 11 from the inflow port 21 and a pulsed current is applied to the heater 9 to heat the fluid in the inner chamber 11. As a result, the fluid expands in accordance with the period of the current flowing to the heater 9, the fluid pressure in the inner chamber 11 increases, the ejection side valve 5 opens, and the fluid ejects intermittently from the ejection port 41. A moving device 30
Thrust acts on and moves. In this case, since there is no externally protruding element such as the displacement element described in the first embodiment, the casing 1 has a good weight balance,
The movement is smooth.

[0008]

As described above, according to the present invention, a pressure device composed of a displacement element or the like in a hollow casing, and an inlet side valve and an outlet side at an inlet and an outlet provided at both ends of the casing, respectively. Since it has a simple structure without a rotating part only by providing a valve, there is an effect that it is possible to provide a small in-fluid moving device for a micromachine which is easy to manufacture.

[Brief description of drawings]

FIG. 1 is a side sectional view showing an embodiment of the present invention.

FIG. 2 is a side sectional view showing the operation of the embodiment of the present invention.

FIG. 3 is a side sectional view showing a second embodiment of the present invention.

FIG. 4 is a front sectional view taken along the line AA of FIG.

FIG. 5 is a side sectional view showing a third embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Casing 11 Inner chamber 12 Opening 2 Inflow side bracket 21 Inflow port 3 Inflow side valve 4 Ejection side bracket 41, 41 'Injection outlet 5 Injection side valve 6 Diaphragm 7 Displacement element 8 Support frame 9 Heater 10, 20, 30 Moving device

Claims (4)

[Claims] 1. A hollow casing having an inner chamber for introducing a fluid, an inflow port provided at one end of the casing, and a fluid pressure of the inner chamber, which is higher than an external fluid pressure. Inlet valve that opens only when the pressure is low, a jet port that is provided at the other end of the casing, and a jet valve that is provided at the jet port and that opens only when the fluid pressure in the inner chamber is higher than the external fluid pressure. And a pressure device that changes the pressure of the fluid introduced into the inner chamber. 2. The in-fluid movement device according to claim 1, wherein the pressure device includes a diaphragm provided on a side surface of the casing and a displacement element that deforms the diaphragm. 3. The in-fluid moving device according to claim 1, wherein the pressure device comprises a heater provided inside the casing. 4. A center casing and a plurality of casings arranged on a side surface of the center casing are provided.
The fluid according to any one of claims 1 to 3, wherein the directions of the ejection ports of the plurality of casings arranged on the side surface are perpendicular to the ejection port of the central casing and are directed in the vertical and horizontal directions. Mobile device