JPH0685341A - Electrostrictive effect element - Google Patents

Abstract

PURPOSE:To prevent the life of an element from deteriorating by the temperature rise of the element due to the heat generation of the element by repeated drive or the temperature rise of the element by the influence of heat at high temperature. CONSTITUTION:In an electrostrictive effect element, where the element 1 of a multilayer body wherein electrostrictive ceramic layers and inner electrodes are stacked alternately is sealed with an airtight terminal 2, a thin metallic case 6, and a metallic member 7, a thick case 9 is made through sliding members such as O-rings 8a and 8b, etc., around the thin metallic case 9. And, through holes 10a and 10b are made in the side face of the thick case 9, and a heat exchanger is caused to flow on the side face of the boundary between the thin metallic case 6 and the thick case 9, whereby the temperature rise by the heat generation of the element and the temperature rise of the element by the ambient heat are prevented and the life of the element is prevented from shortening.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrostrictive effect element,
In particular, it relates to a casing and a heat exchange mechanism.

[0002]

2. Description of the Related Art A conventional electrostrictive effect element uses a laminated type element so that a large mechanical energy can be generated at a low voltage, and the element is placed in a metal case to improve environmental resistance such as humidity resistance. It is hermetically sealed. The inside of the metal case is filled with a filling gas. The thickness of the metal case is extremely thin so as not to suppress the displacement of the element.

The inventors of the present invention have proposed the structures shown in FIGS. 2 and 3 in order to remove the heat generated when repeatedly driven for a long time and to cut off the heat when continuously driven for a long time in a DC manner at a high temperature.

In FIGS. 2 and 3, the laminated electrostrictive effect element 1 as described above includes an airtight terminal 2 and a metal member 7.
Is fixed to the device with an adhesive and is used for driving the lead wires 3a, 3
b is connected to the drive leads 4a and 4b of the airtight terminal 2 via the solders 5a and 5b.

The thin metal case 6, the airtight terminal 2 and the metal member 7 are welded at their respective joints to form the metal member 7.
From the injection hole 12 attached to the
3, a heat insulating agent is injected in the example of FIG. 3, the injection hole 12 is sealed with a rivet 14 and a sealing solder 15, and the structure of this electrostrictive effect element is a hermetically sealed structure as a whole. There is.

[0006]

The above-mentioned conventional electrostrictive effect element and the elements of FIGS. 2 and 3 proposed by the present inventor are used in a hermetically sealed metal in order not to suppress the displacement of the element. The thickness of the case must be extremely thin. As a result, if care is not taken in handling the element, there are drawbacks such as scratches such as dents on the case and airtightness broken by these scratches.

Further, since the thickness of the case is extremely thin, it cannot be pressed by the side surface when the element is mounted, and it is pressed from the upper and lower surfaces of the element, which makes it very difficult to use when incorporating it in an actual device. There is.

When the element is repeatedly driven at a high speed for a long time, the element generates heat, and the heat generation energy raises the temperature of the coolant, resulting in a decrease in the cooling effect.

Further, when the element is continuously driven by DC for a long time at a high temperature, the element itself hardly generates heat, but the exposure to the high temperature for a long time causes the surrounding heat to heat the coolant. However, there is a drawback that the temperature of the element rises and the life of the element is shortened because heat is transferred to the inside through the heat insulating agent.

In the actual assembling work, there is a problem that it is difficult to inject the coolant or the heat insulating agent through the injection hole. As a result, air bubbles enter into the metal case, and the cooling effect of the element is produced. Alternatively, there is a drawback that the heat insulating effect is reduced.

Further, since the cooling agent or heat insulating agent to be used must not contain a component or an impurity that deteriorates the insulating property of the element, the range of selecting the cooling agent or heat insulating agent to be used is also limited. There are drawbacks.

The object of the present invention is to solve the above-mentioned drawbacks. First, when the element is repeatedly driven at a high temperature or when the element is continuously driven in a DC manner at a high temperature, the temperature rise of the element is prevented. The life can be extended. Secondly, it is possible to prevent a leak due to a dent or a scratch during handling. Thirdly, it is to provide an electrostrictive effect element capable of expanding the degree of freedom in mounting on a device or the like.

[0013]

The electrostrictive effect element of the present invention is an electrostrictive effect element obtained by sealing a laminated body in which an electrostrictive salamic layer and an internal electrode conductor layer are laminated with a thin metal case and a metal member. In the above, a thick case is formed around the thin metal case via a sliding material, and at least two through holes are provided on the thick side surface, and the thin metal case and the thick wall case are provided. The heat exchange agent is flowed onto the boundary side surface of the case.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings. FIG. 1 is a sectional view of a first embodiment of the electrostrictive effect element of the present invention.

The electrostrictive effect element of this embodiment is formed as described below. First, the drive lead wire 3 of the element 1
a and 3b are connected to the drive leads 4a and 4b of the airtight terminal 2 via solders 5a and 5b. Next, after assembling the element 1 so as to surround the airtight terminal 2, the thin metal case 6 and the metal member 7, the product is put in a vacuum heating and drying container,
Vacuum drying is performed for 3 hours under the condition of a temperature of 150 ° C. Subsequently, after the inside of the product is replaced with nitrogen gas, the hermetic terminal 2 and the thin metal case 6 and the thin metal case 6 and the metal member 7 are joined together by using a carbon dioxide gas laser in which the inside of the apparatus is in a nitrogen gas atmosphere. Weld the parts.

Subsequently, silicone or Teflon 0-rings 8a and 8b were fitted on the side faces near the upper and lower end faces of the hermetically sealed element, and 10a and 10b were formed in the heat exchange agent flow through holes. Insert into thick case 9.

In actual use, a thick case 9 is used.
The heat exchange agent is flowed by connecting the flow pipes 11a and 11b to the heat exchange agent flow through holes 10a and 10b formed in the above.

When the element is repeatedly driven at a high speed and used, the element itself generates heat and its temperature rises. Therefore, a cooling heat exchange agent such as a coolant flows in order to lower the element temperature. .

When an element is continuously driven by DC at a high temperature for a long period of time, the element itself hardly generates heat. Therefore, in order to prevent the element temperature from rising, the element temperature is positively increased. In order to suppress it, a method of cooling the element or shutting off surrounding heat so that heat is not transferred to the element can be considered. In the former case, a cooling heat exchange agent such as coolant is allowed to flow in the same way as when it is repeatedly driven at high speed, and in the latter case, an adiabatic heat exchange agent with a large heat capacity such as lubricating oil is used. It will flow.

As a result, the temperature rise due to heat generation of the element can be suppressed even when the element is repeatedly driven, and the temperature rise of the element due to the surrounding heat can be suppressed even if the element is continuously driven for a long time at a DC temperature. Can be suppressed,
There was no deterioration in the effect of the heat exchange agent.

In the second embodiment, a fluorinate cooled by a heat exchange device is used as a cooling heat exchange agent. The cooling effect was further improved by flowing the heat exchange agent through the heat exchange device provided outside as in this example.

[0022]

As described above, according to the present invention, in an electrostrictive effect element sealed with a thin metal case, two or more through holes are provided around the thin metal case through a sliding member. By forming a thick case and flowing a heat exchange agent through the through hole, the element is repeatedly driven at high speed, or even when the element is continuously driven in DC at high temperature. It is possible to suppress the temperature rise of the device and improve the life of the device.

Since the thick case is provided around the thin metal, there are no problems such as dents due to a trouble in handling or leakage due to scratches on the case. Even when it is attached to a device such as a device, it can only be pressed from the end face direction in the past, but it can also be pressed on the side of the case, making it easier to handle when installing it on a device.

[Brief description of drawings]

FIG. 1 is a sectional view of a first embodiment of an electrostrictive effect element of the present invention.

FIG. 2 is a sectional view of a conventional electrostrictive effect element.

FIG. 3 is a sectional view of a conventional electrostrictive effect element.

[Explanation of symbols]

 1 element 2 airtight terminal 3a, 3b drive lead wire 4a, 4b drive lead 5a, 5b solder 6 thin metal case 7 metal member 8a, 8b 0-ring 9 thick case 10a, 10b through hole 11a, 11b flow Pipe 12 injection hole 13 rivet 14 sealing solder 15 cooling agent 16 heat insulating agent

Claims (7)

[Claims] 1. An electrostrictive effect element in which a laminated body in which an electrostrictive ceramic layer and an internal electrode conductor layer are alternately laminated is sealed with a thin metal case and a metal member, and is slid around the thin metal case. At least two through-holes are provided on the side surface of the thick-walled case through the moving material, and the heat exchange agent flows on the boundary side surface between the thin metal case and the thick-walled case. Electrostrictive effect element. 2. The electrostrictive effect element according to claim 1, wherein the sliding member is made of vinyl chloride, silicone, or Teflon O-ring. 3. The electrostrictive effect element according to claim 1, wherein a thread groove is formed on at least one side surface of the thick case. 4. The electrostrictive effect element according to claim 1, wherein at least two or more flat portions are formed on the side surfaces of the thick case so as to face each other. 5. The electrostrictive effect element according to claim 1, wherein at least one screw groove is formed on a side surface of the thick case in a case thickness direction. 6. The electrostrictive effect element according to claim 1, wherein the heat exchange agent is made of a cooling material. 7. The electrostrictive effect element according to claim 1, wherein the heat exchange agent is made of a heat insulating material.