JPS6335382Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is a cavity for measuring the distribution state of the sound field in the liquid by immersing it in the liquid receiving ultrasonic waves in ultrasonic cleaning equipment, ultrasonic plating equipment, etc. This relates to the sensor meter sensor.

The center electrode and the piezoelectric sheets bonded to both sides thereof are all made of rubber to form the detection head, and the extension of the center electrode is covered with an insulating rubber plate, and the outer periphery of the rubber plate and the rubber of the detection head are covered. A flexible acoustic probe made by covering the outer surface of a piezoelectric sheet with a conductive rubber coating sheet that also serves as an external electrode was developed in 1974.
It is publicly known as disclosed in Japanese Patent No.-51886.
However, the above-mentioned device was developed by the applicant of the present invention in that both the detection head and the band-shaped lead portion were made flexible.
When using a long extension of about 50 to 100 cm and inserting the detection part at the tip deeply into the liquid, the flexibility of the lead part is extremely increased, so the lead part will not absorb the hydraulic pressure when inserted into the liquid. Not only is the lead easily bent due to the resistance, making it extremely difficult to accurately and quickly position the sensing part at the appropriate location, but also because the lead part itself is made of an organic material that approximates the acoustic impedance of the liquid. Another drawback was that noise was easily picked up from this lead section.

The object of the present invention is to provide a cavitation meter sensor using a piezoelectric rubber sheet that does not have the above-mentioned drawbacks.

An embodiment of the present invention will be described with reference to the accompanying drawings.

In FIG. 1, reference numeral 1 denotes a center electrode made of a metal plate, which consists of a head 2 of about 3 mm and a thin insertion leg 3 that is detected from the circumferential surface of the head. Numerals 4 and 4 are piezo rubber plates formed to have a diameter of 5 mm, slightly larger than the head of the center electrode 1, and have a thickness of about 0.7 mm.
The piezo rubber plates 4, 4 are made by mixing and rolling piezoelectric ceramic powder such as titanium lead or lead zirconate with synthetic rubber before vulcanization, and are joined to both sides of the head 2,
Then, only the insertion legs 3 are made to protrude around the head 2 and are adhered to form the detection element 5 shown in FIG. 2. The detection element 5 is completed by stabilizing the piezo rubber plates 4, 4 by vulcanization, covering the head 2, and further polarizing the piezo rubber plates 4, 4.

Reference numeral 6 denotes a metal pipe of an appropriate length with an outer diameter of about 3 mm, into which an insulated conductor wire 7 is inserted.

The detection element 5 is connected to the insulated conductor 7 by inserting the insertion leg 3 from the front end of the pipe 6 as shown in FIG. Apply an insulating paint 8 to prevent it from coming off, and apply a conductive paint containing molten silver to the outer periphery of the detection element 5 and the outer periphery of the metal pipe 6 to connect the piezo rubber plates 4, 4 and the tip of the metal pipe 6. A conductive paint layer 9 for electrically connecting the conductive paint layer 9 is provided as shown in FIG. 4, and an insulating resin paint coating layer 10 is formed on the outer periphery of the conductive paint layer 9 as shown in FIG. Further, at the rear end of the metal pipe 6, there is a cylindrical terminal 12 electrically connected to the pipe, and a needle terminal 1 protruding from the center of the terminal and electrically connected to an insulated conductor.
Connector 11 consisting of 3 is attached.

The present invention has the above-mentioned structure, and the metal pipe 6 is attached to a moving device, and the detection element 5 is inserted into the cleaning liquid of an ultrasonic cleaning device so as to be movable in two or three dimensions, or as shown in FIGS. 7 and 8. As shown, a metal pipe is shortened and a nut-shaped tightening part c is provided on its outer periphery with a male thread 6', so that the cooling water w can be used for the cooling mantle a of an internal combustion engine as shown in Fig. 7 or the oil pan b as shown in Fig. 8.
Insert the detection element 5 into the inside or oiI so that it can be immersed, screw the male screw 6' into the cooling sleeve a or oil pan b, fix it with the nut c, and detect the sound pressure at each point in the cleaning liquid with the detection element 5. death,
The state of the sound field distribution in the cleaning liquid can be accurately and quickly detected by converting it into a piezo voltage using the piezo rubber plates 4, 4, and then detecting it with a cavitation meter connected to the coated conductor 7 inserted into the metal pipe 6 or the connector. A pure signal captured by the detection element 5 without picking up noise from the outer periphery of the metal pipe 6 due to the difference between the impedance of the metal pipe 6 immersed in a liquid such as cleaning liquid and the impedance of the liquid. can be taken out to the coated conductor 7. Moreover, the metal pipe 6 is rigid,
Since the detection element 5 can be inserted into the target location without difficulty even deep in the liquid, it has the effect of eliminating all the drawbacks of the conventional method, such as facilitating cavitation sound pressure detection using a piezo rubber plate.

[Brief explanation of drawings]

The attached drawings show an embodiment of the present invention, in which Fig. 1 is an exploded perspective view of the detection element 5, Fig. 2 is a perspective view of the completed form, and Fig. 3 is a side view showing the application of insulating paint 8. 4 is a side view of an embodiment in which a conductive paint layer 9 is formed, FIG. 5 is a side view of an embodiment in which an insulating resin paint coating layer 10 is formed, FIG. 6 is a cut side view, and FIGS. 7 and 8. FIG. 3 is a side view showing an example of attachment. DESCRIPTION OF SYMBOLS 1... Center electrode, 3... Insertion leg, 4... Piezo rubber plate, 5... Detection element, 6... Metal pipe, 7
. . . Covered conductor wire, 9 . . . Conductive paint layer.

Claims (1)

[Scope of utility model registration request] A detecting element 5 is formed by bonding and surrounding piezo rubber plates 4, 4 on both sides of the center electrode 1 from which the insertion legs 3 are protruded, and the front end of a metal pipe 6 of an appropriate length into which a covered conductor 7 is inserted is attached to the piezo rubber plate. 4, 4, the insertion leg 3 of the center electrode 1 is inserted from the end of the metal pipe 6, and is inserted and connected to the covered conductor 7 within the pipe, and the piezo rubber plate 4,
A conductive paint layer 9 is provided to cover the outer periphery of the metal pipe 4 and the front end outer periphery of the metal pipe 6 to electrically connect them.
A cavitation meter sensor characterized in that the outer periphery of the conductive paint layer 9 is surrounded by an insulating resin paint coating layer 10.