JPH0418315Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to a transducer in which a piezoelectric element for depth is housed in a boot filled with oil, and in particular to an airtight plug of an oil injection port. Regarding the mounting structure.

[Conventional technology]

Conventionally, as this type of device, for example, the patent application 1983-
There is something disclosed in No. 75752. Such a conventional example will be explained based on FIG. 2. In FIG. 2, the piezoelectric element 1 is first clamped between a presser plate 2 and a flange 3 and fixed by a shaft 4. As shown in FIG. Add this to 5 liters of oil
It is stored in the boot 6 which is filled with the inside of the boot 6 and is fastened with the band 7.

Here, the lead wire of the piezoelectric element 1 is connected to the terminal plate 8.
The terminal plate 8 is attached to the flange 3 through a screw 10 and an O-ring 11 and is in close contact with the flange 3, and an oil inlet 12 with a female thread is formed in the center. It has been done. After injecting oil 5 from the oil inlet 12, O-ring 1
3 and an airtight plug 14 having a male thread are screwed onto the oil inlet 12 from the outside for sealing.

[Problem that the invention attempts to solve]

However, when using this type of conventional example at deep water, the pressure-receiving surface S of the air-tight plug shown in FIG. It won't drip. Therefore, there is a problem that the oil inside the boot leaks and the boot cannot withstand high water pressure.

The present invention was made to solve the above problem, and its purpose is to improve airtightness by preventing the O-ring of the airtight plug from separating from the partition wall even when using high water pressure. The purpose is to improve reliability.

[Means for Solving the Problems] In order to achieve the above-mentioned object, the present invention fixes a piezoelectric element to the lower surface side of a flange attached with a partition wall having an oil inlet inscribed in a through hole. The piezoelectric element is housed together with the flange in a bottomed cylindrical boot filled with oil, and the oil inlet is sealed with an airtight stopper equipped with an O-ring made of an elastic material on the surface facing the partition wall. In an airtight plug mounting structure for a depth transducer in which electrons are hermetically housed in a boot, the airtight plug includes a male screw portion that is inserted into an oil inlet from the inside of a partition wall and projects to the outside of the partition wall; A rotation stopper is provided on the opposing surface that faces the inside of the partition wall when the male threaded portion is inserted into the oil inlet. and a fastener that tightens the O-ring of the air-tight plug so as to press against the inner surface of the partition wall by screwing into the male threaded part of the air-tight plug protruding from the oil inlet to the outside of the partition wall. That is.

[Effect]

According to the above-described configuration, the airtight plug is attached to the inside of the terminal plate serving as a bulkhead that is attached in close contact with the through hole of the flange on which the piezoelectric element is attached to the lower surface side, that is, so as to be in pressure contact with the bulkhead from the inside. .

In other words, if the male threaded part of the airtight plug is inserted into the oil inlet from the inside of the partition wall and protruded to the outside, and the fastener is screwed onto the male threaded part on the outside to tighten.
The O-ring provided on the airtight plug is attached so as to come into pressure contact with the inner surface of the partition wall, thereby sealing the oil inlet.

For this reason, when an airtight plug is exposed to external pressure at a deep level,
The sealing performance is further improved by being pressed in the direction of the partition wall.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 and 3. Incidentally, the same parts as those in the conventional example are given the same numbers and the explanation thereof will be omitted.

Fig. 1 is a sectional view showing an embodiment of the airtight plug mounting structure for a transducer for deep depth according to the present invention, and Fig. 3 is a sectional view of essential parts of an embodiment of the present invention showing a method for installing the airtight plug. It is.

1 and 3, reference numeral 15 denotes an airtight plug, which is attached to seal the oil inlet 12 formed through the terminal plate 16 as a partition wall in the approximate center thereof. An O-ring 13 is provided on the opposing surface. In addition, when attaching this airtight plug 15 to the terminal board 16, a rotation stopper 15a is provided to hold the airtight plug 15 so that it does not rotate. and a male threaded portion 15b that protrudes through the terminal plate 15 and attaches the airtight plug 15 to the terminal plate 16 by screwing and fastening with a fastener to be described later. The terminal board 1
6 is formed with a recess 16a into which a rotation stopper 15a of the airtight plug 15 is fitted. Reference numeral 17 denotes a fastener such as a nut, which is screwed onto the male threaded portion 15b of the airtight plug 15 from the outside of the terminal plate 16 to press the O-ring 13 into contact with the inner surface of the terminal plate 16.

Next, the operation of the above configuration will be explained. First, as shown in FIG. 3, the male threaded portion 15b of the airtight plug 15 is inserted into the oil inlet 12 of the terminal board 16 from the inside thereof, passes through the oil inlet 12, and projects outward. Then, the fastener 17 is screwed onto the male threaded portion 15b on the outside and attached to the terminal plate 16. The terminal plate 16 is attached via the screw 10 and the O-ring 11 so as to be in close contact with the inner circumferential surface of a through hole formed approximately in the center of the flange 3.

Then, the piezoelectric element 1 is clamped between the flange 3 and the holding plate 2 and fixed by the shaft 4. At this time, the lead wire of the piezoelectric element 1 is connected to the terminal of the terminal board 16. This is housed in a boot 6 filled with oil 5 and secured with a band 7, and oil 5 is injected from the oil inlet 12. Next, by tightening the fastener 17 screwed from the outside to the male threaded portion 15b of the airtight plug 15 inserted into the oil inlet 12 from the inside of the terminal plate 16 and projected outwardly. When the piezoelectric element 1 is sealed by crimping the air-tight plug 15 to the terminal plate 16 from the inside via the O-ring 13, the stopper 15a of the air-tight plug 15 fits into the recess 16a of the terminal plate 16, so that the air The seal plug 15 is tightened without rotating. And connector 9
is connected to the terminal plate 16 and attached to the flange 3.

[Effect of idea]

As described above, according to the airtight plug mounting structure of the deep-dive transducer according to the present invention, when the piezoelectric element is housed and sealed in the oil-filled boot through the partition wall having the oil inlet, the oil injector is sealed. With an airtight plug that seals the entrance,
A male threaded portion is inserted into the oil inlet from the inside of the partition and protrudes to the outside of the partition, and a rotation stop is provided on the opposing surface that faces the partition when the male threaded portion is inserted into the oil inlet. A fastener is provided which tightens the O-ring of the airtight plug so as to press it against the inner surface of the partition by screwing into the male threaded part of the airtight plug protruding from the inlet to the outside of the partition. Thereby, after injecting oil from the oil inlet, when the airtight stopper is tightened with a tightening tool, the O-ring can be pressed against the inside of the partition wall, so that the following effects can be achieved.

In other words, even if a large external pressure is applied to the inside of the boot at depth, and a pressure equivalent to the external pressure is built up on the inner surface of the bulkhead through the oil in the boot, this pressure acts in the direction of pressing the airtight plug against the bulkhead, so the air leakage occurs. Sealed O
The ring no longer separates from the bulkhead,
The airtight stopper has the effect of always maintaining airtightness.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing one embodiment of the present invention;
The figure is a sectional view of a conventional example, and FIG. 3 is a sectional view of a main part of an embodiment of the present invention. 1...piezoelectric, 2...pressing plate, 3...flange, 4...shaft, 5...oil, 6...boot,
7... Band, 8... Terminal board, 12... Oil inlet, 13... O ring, 15... Airtight plug, 15a
... Rotation stopper, 16 ... Terminal board, 16a ... Recessed part,
17... Fastener.

Claims (1)

[Scope of Claim for Utility Model Registration] A piezoelectric element is fixed to the bottom side of a flange that is attached with a partition wall having an oil inlet inscribed in a through hole,
This piezoelectric element is housed together with a flange in a bottomed cylindrical boot filled with oil, and the oil inlet is sealed with an airtight plug equipped with an O-ring made of an elastic material on the surface facing the partition wall. In an airtight plug mounting structure for a depth transducer in which a piezoelectric element is hermetically housed in a boot, the airtight plug includes a male threaded portion that is inserted into an oil inlet from the inside of a bulkhead and projects to the outside of the bulkhead. , by providing a rotation stopper on the opposing surface facing the inside of the partition wall when this male threaded part is inserted into the oil inlet, and by screwing into the male threaded part of the airtight plug that protrudes from the oil inlet to the outside of the partition wall. An airtight plug mounting structure for a transducer for depth, characterized in that it includes a fastener for tightening the O-ring of the airtight plug so as to press it against the inner surface of the partition wall.