JPH0417828Y2 - - Google Patents

Description

[Detailed explanation of the idea]

[Industrial Application Field] The present invention relates to a piezoelectric vibrator pump that applies an alternating current voltage between both electrodes of a piezoelectric vibrator to vibrate the piezoelectric vibrator, thereby sucking in and discharging liquid. [Prior Art] The inventor of the present invention has already proposed a piezoelectric vibrator pump as shown in FIG. This piezoelectric vibrator pump is
A piezoelectric vibrator 3 is fixed to the inner periphery of the casing 1, and a suction side check valve 4 and a discharge side check valve 5 are provided in the part of the casing facing the piezoelectric vibrator 3. The lower outlet 1 of the suction side air reservoir 8 has a side inlet 13 on the outlet side of the side check valve 5.
4 and a discharge side air reservoir 9 having a side outlet 15
The lower inlet ports 16 of the pumps are connected to each other, and by providing air reservoirs 8 and 9, the flow rate can be increased and stabilized, and frequency dependence can be reduced. [Problems to be solved by the invention] However, in the above conventional example, when the pump is driven at an angle, the air in the air reservoirs 8 and 9 is replaced with liquid and disappears, and not only does it no longer function as an air reservoir, but also the air reservoir 8 and 9 are provided outside the casing 1, the structure is large and complicated, and the external shape is significantly impaired. [Means for solving the problems] In order to solve the above problems, the pump of the present invention has the following features:
The interior of the casing 1, which is open at the top, is separated by a partition wall 1a.
A piezoelectric vibrator 3 is fixed to the inner periphery of the lower chamber 1b defined by the partition wall 1a, and a suction side check valve 4 and a discharge side check valve 5 are provided on the partition wall 1a. In the upper chamber 1c, which is defined in the upper part and is open at the top, a suction side air reservoir 8 and a discharge side air reservoir 9 are defined by a partition wall 2a.
Each of the air reservoirs 8 and 9 has a suction pipe 6 and a discharge pipe 7 that protrude to reach the suction side of the suction side check valve 4 and the discharge side of the discharge side check valve 5 and have notches 10 and 11 at their tips. It has a structure in which consecutively arranged lid-like casings 2 with open bottoms are fitted and integrated. [Function] The present invention dramatically improves the discharge amount, and
Since the lid-like casing 2, in which the air reservoirs 8, 9, the suction pipe 6, and the discharge pipe 7 are formed, is fitted into the upper chamber 1c of the casing 1, assembly is extremely simple, especially when plastic is used. When manufacturing, it becomes extremely easy to mold each part. Furthermore, by providing the notch 11 at the connection point of the discharge pipe 7, an open pipe end 7a is formed on the air reservoir 9 side of the discharge pipe 7, and this open pipe end 7a allows the pump to The air in the air reservoir 9 is replaced with liquid and does not disappear even when the air reservoir 9 is tilted and driven. [Specific description of the invention] Examples of the invention will be described below with reference to the drawings. FIG. 1 is a sectional view showing the structure of an embodiment of the pump of the present invention. In FIG. 1, 1 is a casing with an open top structure, and 1a is a partition wall that divides the inside of the casing 1 into two. Lower chamber 1 defined by partition wall 1a
The outer periphery of the piezoelectric vibrator 3 is fixed to b. This piezoelectric vibrator 3 includes two piezoelectric films 17, 17, for example.
are laminated, and a thin electrode 1 is placed on the laminated surface and both outer surfaces.
8 and 19 are formed, and lead wires 20 and 21 are connected to these thin electrodes 18 and 19. A suction side check valve 4 and a discharge side check valve 5 are provided on the partition wall 1a. A lid-like casing 2 is fitted into an upper chamber 1c defined at the upper part of the partition wall 1a and having an open upper part. A suction side air reservoir 8 and a discharge side air reservoir 9 are formed in the lid-shaped casing 2 by a partition wall 2a. In addition, each air reservoir 8,9 has
A suction pipe 6 and a discharge pipe 7 are formed to protrude so as to reach the suction side of the suction side check valve 4 and the discharge side of the discharge side check valve 5, respectively. A suction side air reservoir 8 and a discharge side are provided at a part of the connection between the suction pipe 6 and the suction side of the suction side check valve 4, and at a part of the connection between the discharge pipe 7 and the discharge side of the discharge side check valve 5, respectively. Cutouts 10 and 11 communicating with the air reservoir 9 are provided. When an alternating current voltage is applied between the electrodes 18 and 19 of the piezoelectric vibrator 3 via the lead wires 20 and 21, the piezoelectric vibrator 3 vibrates, thereby causing the suction side air reservoir 8 and the suction side check to be drawn from the suction pipe 6. Liquid is sucked in through the valve 4, and the sucked liquid is discharged from the discharge pipe 7 through the discharge side check valve 5, through the discharge side air reservoir 9. By providing notches 10 and 11 at the connection points of the suction pipe 6 and the connection point of the discharge pipe 7, respectively, open pipe ends 6a and 7a are provided on the air reservoir 8 side of the suction pipe 6 and on the air reservoir 9 side of the discharge pipe 7. are formed, and no matter which direction the pump is tilted and driven, the air reservoirs 8 and 9 are
The air inside is replaced by liquid and never disappears. Further, since a portion of the suction pipe 6 and the discharge pipe 7 are connected to the suction side of the suction side check valve 4 and the discharge side of the discharge side check valve 5, when the type of liquid to be pumped is changed, the air reservoir 8, The liquid remaining in the trough-like connecting part 6b of the suction pipe 6 and the discharge pipe 7,
It can be discharged to the outside via 7b. [Example] Next, an experiment was conducted to demonstrate the effects of the present invention. Comparative Example 1: No storage tank Comparative Example 2: Air reservoir 8 is provided only at the suction port of the suction side check valve 4 Example 1: Air reservoir 8 is provided only at the suction port of the suction side check valve 4 and the discharge side check valve 5 The following table shows the results of measuring the discharge flow rate under the same conditions when the air reservoirs 8 and 9, which have upper spaces at the discharge ports, are frozen and both are driven with the frequency of the AC power source changed to 50 Hz and 60 Hz.

[Effect of idea]

Since the present invention has the above-mentioned configuration, the discharge amount is dramatically improved, and after the piezoelectric vibrator 3 and the check valves 4 and 5 are attached to the casing 1, the lid-like casing 2 is fitted and fused. Completed and extremely easy to assemble. In addition, by providing a notch 11 that communicates with the discharge side air reservoir 9 in a part of the connection point of the discharge pipe 7 with the discharge side of the discharge side check valve 5, an open pipe end is provided on the air reservoir 9 side of the discharge pipe 7. 7a is formed, no matter what direction the pump is tilted and driven, the air in the air reservoir 9 will be replaced with liquid and will not disappear, so the pump can be installed and used in any direction. Not only can the function of the air reservoir 9 be fulfilled even when the air reservoir 9 is used, but also because the air reservoir 9 is provided inside the casing, the structure is small and simple, and the external shape is not impaired.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing the configuration of an embodiment of the pump of the present invention, and FIG. 2 is a sectional view showing an example of a conventional pump. 1... Casing, 1a... Partition wall, 1b...
Lower chamber, 1c... Upper chamber, 2... Lid-like casing, 2a... Partition wall, 3... Piezoelectric vibrator, 4...
Suction side check valve, 5...Discharge side check valve,
6...Suction pipe, 7...Discharge pipe, 6a, 7a...
Open pipe end portions, 6b, 7b...Gutter-like connecting portions, 8...
...Suction side air reservoir, 9...Discharge side air reservoir, 1
0, 11... Notch.

Claims (1)

[Scope of utility model registration request] The interior of the casing 1, which is open at the top, is divided into two parts by a partition wall 1a, and a piezoelectric vibrator 3 is fixed to the inner periphery of a lower chamber 1b defined by the partition wall 1a. A discharge side check valve 5 is provided, and a suction side air reservoir 8 and a discharge side air reservoir 9 are defined by the partition wall 2a in the upper chamber 1c which is defined at the upper part of the partition wall 1a and is open from above. Each of the air reservoirs 8 and 9 has a notch 10 and 1 that protrudes so as to reach the suction side of the suction side check valve 4 and the discharge side of the discharge side check valve 5, and has notches 10 and 1 at the tip.
A piezoelectric vibrator pump is formed by fitting and integrating a lid-like casing 2 with an open bottom, in which a suction pipe 6 and a discharge pipe 7 are connected.