JPS59200083A - Pump - Google Patents

Abstract

PURPOSE:To eliminate an intermediate transmission mechanism while to simplify the structure and to reduce the size thus to reduce the material cost and to improve the productionability by constructing the pump body with first, second and third chips while utilizing an unimolf vibration chip. CONSTITUTION:In a liquid feed pump, positive/negative voltage of predetermined frequency is applied onto a lead wire 9 connected to a thin disc or an unimolf vibration chip 1, to deform said chip 1 in convex/concave alternatively to perform pumping function thus to flow liquid fuel into a pressurizing section 4 and pressure fed through a delivery side check valve 6. The pump body 3 is splitted into first, second and third construction chips 12, 13, 14. Consequently the material and production cost can be reduced while the size is also reduced. Furthermore through utilization of an unimolf vibration chip 1, an intermediate transmission mechanism can be eliminated resulting in improvement of efficiency, simplification of structure and reduction of size.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a pump that uses a unimorph vibrator in which a piezoelectric ceramic thin plate and a metal thin plate are bonded together to directly convert electricity into vibration in a vibrating part that pressurizes a fluid.

<Prior art> Conventional pumps use electric motors and shafts to operate impellers, pistons, or plungers, and their rotational and reciprocating motion applies centrifugal force to liquid fuel and discharges it.
Schilling - It had a structure that discharged by expanding and contracting the internal volume. However, in this conventional pump, the impeller, piston, planter, etc. that act directly on the liquid fuel cannot move by themselves even if an electric signal is applied. In addition, the plunger has a magnetic field (electromagnetic force) caused by the current flowing through the solenoid.
However, having such an intermediate transmission mechanism leads to an increase in the size of the pump plain wood.
Moreover, the internal structure was complicated.

<Purpose> In view of the above points, the present invention uses a unimorph vibrator, which directly converts electrical energy into reciprocating vibration, in the mechanical part of the pump, thereby simplifying and downsizing the structure, and achieving a mutually The aim is to provide a pump that can reduce costs and improve productivity.

<Example> Hereinafter, an example of the present invention will be described based on the drawings. First, an example of a liquid feed pump for fluid, for example, liquid fuel, according to the present invention will be described with reference to the drawings, with reference to a case where a single disc-shaped unimorph vibrator is used.

Figures 1, 2, and 3 are a plan view, a sectional view, and a bottom view of the liquid pump, respectively, and Figures 4 and 5 are a piezoelectric ceramic thin plate and a metal thin plate used for the vibrating part, respectively. FIG. 2 is a bottom view and a cross-sectional view of a disc-shaped unimorph resonator bonded together.

1st. , 2 and 3, 1 is a disk-shaped unimorph vibrator using a piezoelectric ceramic thin plate (piezo element) 2 in the vibrating part, and a liquid pressurizing part inside the pump body 3 consisting of three components. A disk-shaped unimorph resonator 1 is arranged at 4 so that its volume can be expanded or contracted. Reference numeral 5 denotes a metal thin plate that constitutes the unimorph vibrator 1 together with the piezoelectric ceramic thin plate 2, 6 a discharge side check valve, 7 a suction side check valve, 8 a discharge side joint, 9 a conductive wire, and 10 a unimorph vibrator. A gasket 11 is a suction side joint that fixes the outer circumference of the pump and seals the pressurizing part 4.

In the liquid pump having the above structure, when positive and negative voltages of a constant frequency are applied to the conductor 9 connected to the unimorph oscillator 1, the unimorph oscillator 1 as shown in FIGS. 5(a) and 5(b) is deformed alternately into a concave and convex shape.

There are two check valves 6°7 in front of the unimorph oscillator 1, and when the unimorph oscillator 1 changes into a concave shape as shown in FIG. 5 (1), the discharge side check valve 6 closes and the suction side The side check valve 7 opens and liquid fuel flows into the liquid pressurizing section 4.

Next, when the unimorph vibrator 1 changes from a planar shape to a convex shape as shown in FIG. 5 (ll), the suction side check valve 7 closes and the discharge side check valve 6 opens. This fuel is fed under pressure through the discharge side check valve 6).

When a positive and negative voltage of a constant frequency is applied to the conductor 9, the unimorph resonator 1 deforms alternately into concave and convex shapes as shown in FIG. A proportional amount of deflection can be obtained, and the discharge flow rate of the pump can be controlled by voltage.

Next, the main parts of the embodiment of the present invention will be explained in more detail with reference to FIG. 6 and subsequent figures.

As shown in Figures 6 and 7, the unimorph oscillator 1 is a disk-shaped thin plate, and the pump was designed to take advantage of its characteristics in the form of a product and to reduce grinding costs and improve productivity (molding, processing, assembly). Main body 3
is divided into three pieces: a first component piece 12, a second component piece 13, and a third component piece 14. The first component 12 in FIG. 6 includes a liquid fuel discharge side connection joint 8, a suction side connection joint j1, and a first suction passage 15 and a second discharge passage 16 formed through each joint 8°11. , a suction side valve seat 17, a discharge side valve recess 18, and a sealing gasket groove 19 are provided at one end side of each passage 15,16. The second component piece 13 in FIG. 7 includes a discharge side valve seat 20 and a second discharge passage 21 passing through the center thereof.
and the suction side valve recess 22, the second suction passage 23, the sealing gasket groove 32, and the cushion-cum-sealing gasket support surface 2.
4a is provided. The third component piece 14 is provided with a support surface 25 for the unimorph vibrator 1 and a cushion/sealing packing support surface 241].

Note that the support surface 25 of the unimorph vibrator 1 can also be provided on the second component piece 13 as shown on the modified side in FIG.

Further, to connect the first component piece 12, second component piece 13, and third component piece 14, which are divided into three parts, the fastening screw hole 33, the same through hole 33a and the fastening screw 34, or means such as adhesive are used. It will be done. and the first component piece 12, the second component piece 13,
The shape of the third component piece 14 is a round shape 26 with the same diameter as shown in @9(a), a same triangular shape 27 as shown in FIG.9(b), or a same square shape as shown in FIG.9(c). 28, and the maximum dimension R from the center is 1 of the radius r of the unimorph resonator 1.
゜2 to 2 times. For example, in the case of a unimorph vibrator 1 with a small radius r, when the radius is 1 and the power bow is Omm, the size of the pump body 3 is 1.
It is 5 to 2 times 15 to 20 mm, and the radius is r or 25 m.
When m is large, the size is 30 to 40 non, which is 1.2 to 1.6 times that of a unimorph oscillator.

The first, second, and third component pieces 12 are divided into three by this size,
13 and 14 and for supporting the unimorph resonator 1.

Next, regarding the combined thickness T of the first, second, and third components divided into three parts, as shown in Figure 10.13, the suction side connection joint 1
1, the discharge side connection joint 8, and the height of the head of the screw 34, excluding the height, shall be 15 to 30 mm. For example, two check valves, the suction side check valve 7 and the discharge side check valve 6, are located between the first component piece 12 and the second component piece 13. .For types such as the ring valve 30 having a cut 30a as shown in Figure 11 or the door valve 29 equipped with a pair of valves 6 and 7 having a cut 29a as shown in Figure 12, the entire pump is designed to be thin. This makes it possible to reduce the thickness T to 1
It can be 5 to 20 mm.

In addition, a check valve 6, 7 using a check spring type spring 31 and a ball valve 32 as shown in FIG.
A thickness T of 20 to 30 mm is required.

Effects> As is clear from the above description, according to the present invention, the following effects can be expected.

(b) By using a unimorph resonator, the function and structure are simplified and miniaturization becomes possible.

(b) The number of functional parts is reduced, and the cumulative influence of shape accuracy of each part is reduced, so high quality can be expected.

(c) The conventional intermediate transmission mechanism can be omitted, and loss in this mechanism can be eliminated, resulting in high efficiency.

(d) It is inexpensive in terms of cost.

(e) Since there is no reciprocating movement, there are no quality problems due to wear and tear.

(f) The discharge amount can be controlled linearly by the magnitude of the voltage.

(g) The pump body consists of first, second, and third component pieces.
Since the main body is formed in one piece, costs can be reduced in terms of materials and production, and the shape can be made lighter, thinner, and smaller.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a partially cutaway top view of the entire embodiment, FIG. 2 is a longitudinal sectional view of the same, FIG. 3 is a partially cutaway bottom view of the same, and FIG. The figure is a bottom view of the unimorph resonator, FIGS. 5(a) and (b) are sectional views for explaining the operation of the unimorph resonator, and FIGS. 6(a), (b), and (C) are the first component pieces, respectively. Plan view, vertical sectional view, bottom view, Fig. 7(a), (
b) and (c) are respectively a plan view, a vertical cross-sectional view, and a bottom view of the second component; FIG. 8 (a), (+)) are respectively a plan view and a vertical cross-section of the third component Figure, bottom view, Figure 9(a),
(b) and (c) are perspective views of the entire bottom side of different modifications, Figure 1 () is an overall side view of one embodiment, Figure 11 is a plan view of the same check valve, and Figure 12 is a reverse view of the check valve. FIG. 13 is a plan view of a modification of the stop valve, FIG. 13 is a side view of another modification, and FIG. 14 is a longitudinal sectional view of still another modification. 1: Unimol 7 vibrator, 3: Pump body, 6, 7: Check valve, 8: Discharge side connection joint, 10: Pressure part sealing seal, 11: Suction side connection joint, 12: First component piece, 13: second component piece, 14: third component piece, 15: first suction passage, 1
6: first discharge passage, 17 second suction side valve seat, 20: discharge side valve seat, 21: second discharge passage, 23: second suction passage, 24a
, 24b: Packing support surface, 25: Unimorph resonator support surface. Applicant Sharp Corporation Agent Tsunehisa Nakamura Figure 6 Figure 7 (a) (a) Figure 9 Figure 10 Figure 14

Claims (1)

[Claims] In a pump in which a unimorph vibrator that directly converts electricity into vibration is provided in the vibrating part that pressurizes the material to be pressurized, and check valves are provided in the suction passage and the discharge passage of the material to be pressurized, the pump body (3) is The first constituent pieces (12
), a second constituent piece (13), and a third constituent piece (14) are fixed to each other in sequence, and the first constituent piece (12) has a suction side connection joint (11) for the pressurized material, and a discharge side connection joint (11). Side connection joint (8
), a first suction passage (15
), a first discharge passage (16) and a suction side valve seat (17), and the second component (13) is provided with a discharge side valve seat (2).
0), a second suction passage (23), a second discharge passage (21), and a support surface (24a) for the pressurized part sealing gasket (10), and the third component (14) is provided with a A pressure part sealing packing support surface (24b) is provided, and a unimorph vibrator (1) is provided on one of the second and third component pieces (13, 14).
) A pump characterized in that it is provided with a support surface (25).