JPH0724640Y2 - Fixed structure of ultrasonic pump - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an improvement in a fixing structure for fixing an ultrasonic pump used as a sprayer in a spraying device to a housing, for example.

(Prior Art) Conventionally, as a means for fixing an ultrasonic pump of this type to a housing, for example, as described in Japanese Utility Model Laid-Open No. 63-193799, a waterproof coating is applied to the outer periphery of a piezoelectric element. A means is known in which a collar or a projecting piece is provided on the outer circumference of a body, and these are used to attach an ultrasonic pump to a housing by a fastening member such as a bolt or a nut.

(Problems to be solved by the invention) However, in the case of the above-mentioned conventional example, since a dedicated member having a specific structure integrally formed with the waterproof cover is required, it is costly and uneconomical. When installing, it is necessary to align the multiple mounting holes on the collar or the protrusion with the multiple through holes on the housing side and tighten the nuts by inserting bolts into both holes, making the installation work extremely complicated. There is a problem that I said.

The present invention was developed with the object of solving the above-mentioned problems, and an ultrasonic pump fixing structure capable of easily and surely attaching an ultrasonic pump to a housing by using a commercially available O-ring is provided. The purpose is to provide.

(Means for Solving the Problems) As means for solving the above problems, the present invention provides:
A fitting groove is provided on the circumferential surface of at least one pressure fixing member of the members for vertically pressing and fixing the piezoelectric element of the ultrasonic pump mounted on the shaft body, the electrode plate, etc. A step portion is provided at an appropriate place on the inner surface of the housing to be installed, and an O-ring is press-fitted between the fitting groove and the step portion, and the ultrasonic pump is elastically fixed to the housing by the O-ring. We have developed and adopted a fixed structure for ultrasonic pumps.

(Operation) When the fitting groove of the pressurizing and fixing member configured as described above and the step portion provided on the inner surface of the housing are opposed to each other and the O ring is press-fitted therebetween, the elasticity of the O ring causes the ultrasonic pump to operate. It is fixed elastically to the housing and does not move. Further, with respect to the vibrational action of the ultrasonic pump in the axial direction, which is necessary for the ultrasonic pump to perform its required functions, the elasticity of the O-ring acts so as not to hinder the vibrational action, and also to the housing side. Since the propagating vibration is absorbed by the elasticity of the O-ring, it acts so as not to adversely affect the housing side. Further, the inside of the housing and the inside of a member such as a spray cylinder, which is disposed in the upper part of the housing, are isolated by the O-ring and do not communicate with each other except the pores of the pump shaft. Act to exert.

(Example) Below, several examples of this invention are described based on each accompanying drawing.

FIG. 1 shows Example 1 in which 1 is an ultrasonic pump for generating atomized particles in a spraying device,
The liquid suction port 2 is provided at the lower end, the atomized particle generation port 3 is provided at the upper end, and the plurality of piezoelectric elements 6 and the electrode plate 7 are provided on the outer periphery of the middle portion of the thin tubular shaft body 5 having the screw 4 on the outer periphery. Are alternately laminated, and the pressure fixing members 8a and 8b made of nuts are screwed onto the upper and lower sides of the laminated body, and the upper and lower pressure fixing members are formed.
It is configured by fastening and integrating the laminated body with 8a and 8b,
In this embodiment, a fitting groove 9 is formed on the outer peripheral surface of the lower pressure fixing member 8b. Then, a high-frequency voltage is applied between the intermediate electrode plate 7 and the upper and lower electrode plates 7, 7 to apply voltage elements 6 to each other.
Electrostrictive vibration is generated in the shaft 5, and the electrostrictive vibration is expanded and expanded by using the shaft body 5 as a conversion medium to generate ultrasonic vibration in the shaft body 5, and the liquid is sucked up from the liquid suction port 2 by the ultrasonic vibration.
This is atomized and sprayed from the atomized particle generation port 3.

Next, 10 is a housing for accommodating and mounting the ultrasonic pump 1, and in this embodiment, a bottom plate 12 is fitted to the lower open portion of the cylindrical body 11 and the inner circumference is provided to the upper open portion. An annular support plate 14 around which a stepped portion 13 for supporting is provided is fitted on the surface, and in the drawing, 15 is a sealing O-ring,
L indicates the liquid for atomization stored in the housing 10.

Then, the ultrasonic pump 1 configured as described above is inserted into the housing 10, and between the fitting groove 9 of the pressure fixing member 8b below the ultrasonic pump 1 and the step portion 13 of the housing 10. The ultrasonic pump 1 is elastically fixed to the housing 10 by the elasticity of the O-ring 16 with an O-ring 16 made of an elastic material interposed therebetween.

In order to press-fit the O-ring, the O-ring is usually inserted into the fitting groove 9 of the pressure fixing member 8b of the ultrasonic pump 1.
After the pump 16 is fitted in advance, the pump 1 is inserted into the housing 10 and the O-ring 16 is press-fitted toward the step portion 13 side of the housing 10. However, on the contrary, the housing 10 Place the O-ring 16 on the step 13 of the
Then, the ultrasonic pump 1 may be inserted into the housing 10 and the O-ring 16 may be press-fitted into the fitting groove 9 of the pressurizing and fixing member 8b. It is not particularly limited.

As described above, since the ultrasonic pump 1 attached to the housing 10 via the O-ring 16 is elastically fixed to the housing 10 by the elasticity of the O-ring 16, there is no risk of deviating due to ultrasonic vibration. Vibration of the supersonic wave pump 1 is O
Since it is not absorbed by the elasticity of the ring 16 and is not propagated to the housing side, the adverse effect of vibration is not exerted on the housing side, and the predetermined vibration action of the ultrasonic pump 1 itself is adversely affected. The desired function of the ultrasonic pump can be normally exerted. Further, the inside of the housing 10 and the inside of a spray cylinder (not shown) continuously provided on the upper part of the housing are isolated by an O-ring 16,
Since the pump shaft 5 does not communicate with other parts than the pores of the shaft body 5, there are various advantages due to the isolation action. In particular, according to this embodiment, the piezoelectric element 6 of the ultrasonic pump 1 is particularly effective.
Since the electrode plate 7 and the electrode plate 7 are completely isolated from the liquid L in the housing 10, the functions of the piezoelectric element 6 and the electrode plate 7 due to the liquid wetting do not deteriorate.

Next, FIG. 2 shows a second embodiment of the present invention. In this embodiment, the upper pressure member 8a of the upper and lower pressure fixing members 8a, 8b made of nuts is fitted to the peripheral surface of the upper pressure member 8a. The point where the groove 9 is provided,
A point that the housing 10 is configured as a single body, and an O-ring 16 is interposed between the fitting groove 9 of the upper pressure fixing member 8a and the step portion 13 of the housing 10, and the lower surface of the annular O-ring holding plate 17 A ring-shaped ridge 18 projecting from the above is press-fitted into the gap between the O-ring 16 and the peripheral wall of the stepped portion 13, and the ultrasonic pump 1 and the housing 10 are elastically fixed by the O-ring 16. This is different from Example 1 in the point. According to this embodiment, since the mounting portion of the pump 1 with respect to the housing 1 is located above, there is an advantage that the mounting state of the pump 1 is stable as compared with the first embodiment.
The isolation between the piezoelectric electrons 6, the electrode plate 7 and the liquid L in the housing 10 is incomplete.

Furthermore, FIG. 3 shows a third embodiment of the present invention, in which the upper and lower pressure fixing members 8a and 8b composed of nuts are used.
The fitting groove 9, 9 is provided on the peripheral surface of the housing 10, and the same fixing structure as that of the first embodiment is provided below the housing 10, that is, the housing 10.
13 provided below the pump and a pressure fixing member below the pump 1.
An O-ring 16 is press-fitted between the fitting groove 9 of 8b and the pump 1 is fixed to the housing 10, and at the same time, a fixing structure similar to that of the second embodiment is provided above the housing 10. An O-ring 16 is provided between the step portion 13 provided above the housing 10 and the fitting groove 9 of the pressurizing member 8a above the pump 1.
And the annular ridge 18 protruding from the lower surface of the annular pressing plate 17 is press-fitted into the gap between the O-ring 16 and the peripheral wall of the stepped portion 13 to fix the pump 1 to the housing 10. This embodiment is different from the first and second embodiments in that the structure is adopted. According to this embodiment, since the pump 1 is elastically fixed to the housing 10 at the two upper and lower positions, the stabilization of the mounting state can be further improved, and the piezoelectric element 6 and the electrode plate 7 of the pump 1 are inside the housing 10. Not only is the liquid L separated from the liquid L, but there is an advantage that it can be separated from the atomized particles (not shown) generated from the atomized particle generation port 3 of the pump 1.

Furthermore, FIG. 4 shows a fourth embodiment of the present invention, in which the upper and lower pressure fixing members 8 of the ultrasonic pump 1 are fixed.
Of a and 8b, a normal nut is used for the lower pressure fixing member 8b, and the upper pressure fixing member 8a has a large diameter integrated with the shaft body 1 in which a part of the upper portion of the shaft body 1 is expanded. And a fitting groove 9 is provided on the peripheral surface of the large diameter portion, which is different from each of the above-described embodiments, and is implemented between the fitting groove 9 and the step portion 13 of the housing 10. In the same state as in Example 1, the pump 1 is elastically fixed to the housing 10 with the O-ring 16 being press-fitted. According to this embodiment, substantially the same advantages as the second embodiment can be exhibited.

In the above embodiment, the same parts are designated by the same reference numerals.

Although the main embodiments of the present invention have been described above, the present invention is not limited to the above-mentioned embodiments, and it is obvious that various design changes can be made without departing from the gist of the present invention. is there.

(Effect of the Invention) The fixing structure of the ultrasonic pump according to the present invention is a pressure fixing of at least one of the members for pressing and fixing the piezoelectric element, the electrode plate, etc. of the ultrasonic pump mounted on the shaft from above and below. A fitting groove is provided on the peripheral surface of the member, and a step portion is provided at an appropriate place on the inner surface of the housing in which the ultrasonic pump is mounted, and an O-ring is press-fitted between the fitting groove and the step portion. Since the ultrasonic pump is elastically fixed to the housing by the O-ring, the following effects can be obtained.

(1) Since the ultrasonic pump and the housing are elastically fixed by the elastic O-ring interposed between the fitting groove on the ultrasonic pump side and the step on the housing side, the ultrasonic pump vibrates. Due to the action, it is possible to reliably prevent delusion from the predetermined position of the housing.

(2) With respect to the vibrational action of the ultrasonic pump in the axial direction, which is necessary for the ultrasonic pump to exert its function, the elasticity of the O-ring does not hinder the vibrational action, ensuring the desired spraying function. The vibration that can be achieved and propagated to the housing side is absorbed by the elasticity of the O-ring, so that it does not adversely affect the housing side.

(3) Since the liquid storage side of the housing and, for example, the spray cylinder side connected to the upper part of the housing are separated by the O-ring except for the fine pores of the shaft body of the ultrasonic pump, the housing is separated. Depending on the amount of the stored liquid inside, there is no possibility that the stored liquid will flow out to the spray cylinder side even if the ultrasonic pump falls over.

(4) Since a commercially available O-ring can be obtained and used at a low cost, the pump can be fixed to the housing at a much lower cost as compared with the case where the dedicated fixing member having the conventional special structure described above is used. Installation work is also extremely simple and easy.

[Brief description of drawings]

The drawings show an embodiment of the present invention, and FIGS. 1 to 4 are vertical sectional front views of Embodiments 1 to 4 of the present invention, respectively. (Explanation of symbols) 1 ... Ultrasonic pump, 5 ... Shaft, 6 ... Piezoelectric element, 7
...... Electrode plate, 8a ・ 8b …… Pressure fixing member, 9 …… Mating groove,
10 …… Housing, 13 …… Step, 16 …… O-ring.

Claims (4)

[Scope of utility model registration request] 1. A piezoelectric element of an ultrasonic pump mounted on a shaft body,
A fitting groove is provided on the peripheral surface of at least one pressure fixing member of the members for pressure fixing the electrode plate or the like from above and below,
A step portion is provided at a proper place on the inner surface of the housing in which the ultrasonic pump is installed, and an O ring is press-fitted between the fitting groove and the step portion, and the ultrasonic pump is elastically fixed to the housing by the O ring. A fixing structure for an ultrasonic pump, characterized in that 2. The fixing structure for an ultrasonic pump according to claim 1, wherein the pressure fixing member provided with the fitting groove is constituted by a nut. 3. The pressure fixing member according to claim 1, wherein the pressure fixing member is formed of a large-diameter portion of the shaft body, and a fitting groove is provided in the pressure fixing member. Ultrasonic pump fixed structure. 4. The fixing structure for an ultrasonic pump according to claim 1, wherein both the upper and lower pressure fixing members are nuts, and fitting grooves are provided in both of them. .