JP2910440B2 - Electrostrictive effect element - Google Patents

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 element so that large mechanical energy can be generated at a low voltage, and the element is placed in a metal case in order to enhance environmental resistance such as moisture resistance. 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 present inventor has proposed the structures shown in FIGS. 2 and 3 in order to eliminate the heat generated when the device is driven repeatedly for a long time and to cut off the heat when the device is driven continuously for a long time in DC at a high temperature.

[0004] In FIGS. 2 and 3, the laminated electrostrictive element 1 as described above has a hermetic terminal 2 and a metal member 7.
Are fixed with an adhesive, and the driving leads 3a, 3
b is connected to the driving leads 4a and 4b of the hermetic terminal 2 via the solders 5a and 5b.

[0005] The thin metal case 6, the hermetic terminal 2 and the metal member 7 are welded at their respective joints.
In the example of FIG.
In the example of FIG. 3, a heat insulating agent is injected, the injection hole 12 is sealed with a rivet 14 and a sealing solder 15, and the structure of the electrostrictive effect element is a hermetically sealed structure as a whole. I have.

[0006]

The conventional electrostrictive effect element described above and the elements shown in FIGS. 2 and 3 proposed by the present inventor are made of a metal used in an airtight manner so as not to suppress the displacement of the element. The thickness of the case must be made extremely thin. As a result, if care is not taken in the handling of the element, there is a defect that the case is damaged such as a dent, and the airtightness is broken by these scratches.

Further, since the thickness of the case is extremely thin, it cannot be held down by the side when the element is mounted, and is held down from the upper and lower surfaces of the element. There is.

When the element is repeatedly driven at a high speed for a long time, the element generates heat, and the heat generated by the element causes a rise in the temperature of the coolant, thereby deteriorating the cooling effect.

Further, when the element is driven continuously for a long time in DC at a high temperature, heat generation of the element hardly occurs, but the coolant is heated by the influence of surrounding heat due to exposure to the high temperature for a long time. Or the heat is transmitted to the inside through the heat insulating agent, resulting in a drawback that the temperature of the element increases and the life of the element decreases.

In the actual assembling work, there is a problem that it is difficult to inject the coolant or the heat insulating agent from the injecting hole, and as a result, air bubbles enter the inside of the metal case, and the cooling effect of the element is reduced. Alternatively, there is a disadvantage that the heat insulating effect is reduced.

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

SUMMARY OF THE INVENTION An object of the present invention is to address the above-mentioned drawbacks. First, when the element is repeatedly driven at a high temperature or when the element is continuously driven at a high temperature in a DC manner, the temperature of the element is prevented from rising. The service life can be extended. Secondly, it is possible to prevent a dent or a scratch from being caused at the time of handling to cause a leak. Third, it is an object of the present invention to provide an electrostrictive effect element capable of expanding the degree of freedom of attachment to a device or the like.

[0013]

An electrostrictive effect element according to the present invention is obtained by sealing a laminate of an electrostrictive salamic layer and an internal electrode conductor layer with a thin metal case and a metal member. , A thick case is formed around the thin metal case via a sliding material, at least two or more through holes are provided on the thick side surface, and the thin metal case and the thick Insulation material on the border side of the case
Characterized by flowing a heat exchanger consisting of

[0014]

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 driving lead wire 3 of the element 1
a, 3b are connected to the driving leads 4a, 4b of the hermetic terminal 2 via the solders 5a, 5b. Next, after assembling the element 1 so as to be surrounded by the hermetic terminal 2, the thin metal case 6, and the metal member 7, the product is placed in a vacuum heating and drying container.
Vacuum heating and drying are performed at a temperature of 150 ° C. for 3 hours. Subsequently, after the inside of the product is replaced with nitrogen gas, the airtight terminal 2 and the thin metal case 6 and the thin metal case 6 and the metal member 7 are joined using a carbon dioxide laser in which the inside of the device is a nitrogen gas atmosphere. Weld the parts.

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

In actual use, a thick case 9
The flow pipes 11a and 11b are connected to the heat exchange agent flow through-holes 10a and 10b formed in the above, and the heat exchange agent flows.

When the element is used by repeatedly driving it at a high speed, the element itself generates heat and its temperature rises, so that a cooling heat exchange agent such as a coolant flows to lower the temperature of the element. .

When the device is used by driving it continuously at a high temperature for a long time in a DC manner, since the device itself hardly generates heat, it is necessary to actively increase the temperature of the device in order to prevent the temperature of the device from rising. In order to suppress this, a method of cooling the element or shutting off the surrounding heat so that heat is not transmitted to the element can be considered. The former would be the flow of the cooling of the heat exchange medium, such as a well as a coolant in the case of using driven repeatedly at a high speed, for the latter, a large thermal insulation of the heat exchanger of the heat capacity of such lubricants It will flow.

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

[0021]

[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 via a sliding member. Even when the element is driven repeatedly at a high speed by forming a thick case and flowing the heat exchange agent through this through hole, or when the element is continuously driven in a DC manner at a high temperature, the element is formed. Temperature rise can be suppressed, and the life of the element can be improved.

Since the thick case is provided around the thin metal, there is no problem that a dent is formed due to a trouble at the time of handling, and a problem that the case is flawed to cause a leak is eliminated. In the past, when the device was mounted on a device or the like, the device could only be pressed from the end face direction. However, the device can also be pressed on the side surface of the case.

[Brief description of the drawings]

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

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

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

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Element 2 Airtight terminal 3a, 3b Driving lead wire 4a, 4b Driving 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 coolant 16 heat insulator

Claims (3)

(57) [Claims] 1. An electrostrictive effect element in which a laminate in which electrostrictive ceramic layers and internal electrode conductor layers are alternately laminated is sealed with a thin metal case and a metal member, wherein the electrostrictive effect element slides around the thin metal case. Form a thick case via moving material
At least two or more through-holes are provided on the thick side surface, and a heat exchange agent made of a heat insulating material is flown on the boundary side surface between the thin metal case and the thick case. Electrostrictive effect element. 2. The electrostrictive effect element according to claim 1, wherein the sliding member comprises a 0-ring of vinyl chloride, silicone or Teflon. 3. The electrostrictive effect element according to claim 1, wherein at least two flat surfaces are formed on the side surface of the thick case in opposition to each other.