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Pump

Inactive Publication Date: 2005-01-27
SEIKO EPSON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0013] According to this construction, since the pump includes the bubble discharging device, the pump can be started even when gas bubbles stay in the pump chamber. Specifically, even when the working fluid is not filled in the pump chamber. Further, when the gas bubbles stay in the pump chamber, although it is considered that the pressure in the pump chamber is not sufficiently raised, the staying gas bubbles can be discharged in driving the pump, due to the aforementioned bubble discharging device. So it is possible to maintain performance of the pump, specifically, the discharge amount of the working fluid.
[0062] As a result, since the gas bubbles can be generated in the pump chamber due to the change of phase and a complex and non-stagnated flow flowing out to the outlet passage can be caused in the pump chamber, it is possible to easily discharge the gas bubbles staying in the pump chamber.

Problems solved by technology

However, in the construction of Japanese Unexamined Patent Application Publication No. 2000-265963 there is a problem that it is not possible to cope with the high load pressure or high frequency driving, because the inlet passage and the outlet passage all require the check valve serving as a fluid resistance element.
Thus, the pressure loss of the fluid is large through the two check valves.
In a case where gas bubbles stay in the pump chamber, there is a problem that it is not possible to obtain a predetermined amount of discharge, because the pressure of the liquid in the pump chamber is not raised enough in the course of reducing the volume of the pump chamber.
Furthermore, in the pumps having the constructions of Japanese Unexamined Patent Application Publication No. 2002-322986 and Japanese Unexamined Patent Application Publication No. 61-171891, since the variation in volume of the pump chamber due to the deformation of the diaphragms is small, the pressure of the liquid in the pump chamber is not raised enough in the course of reducing the volume of the pump chamber when gas bubbles stay in the pump chamber.
As a result, the flow characteristics of the pump are largely deteriorated.
If things come to the worst, it may be impossible to discharge the liquid.

Method used

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first exemplary embodiment

[0082] First Exemplary Embodiment

[0083] FIGS. 1 to 3 show a pump 10 according to a first exemplary embodiment.

[0084]FIG. 1 is a vertical cross-sectional schematic illustrating a structure of the pump 10 according to the first exemplary embodiment of the present invention. In FIG. 1, the pump 10 includes a cup-shaped case 50 to which a laminated piezoelectric element 70 is fixed, an inflow passage 21 to introduce a working fluid, an outflow passage 28 to discharge the working fluid, and a pump case 20 having a secondary pump chamber 24 and a primary pump chamber 27.

[0085] One end of the laminated piezoelectric element 70 is fixed to an inside bottom portion of the case 50 through a fixing device, such as adhesive. A primary pump chamber diaphragm 60 is closely fixed to both of a top surface of an edge portion of the case 50 and a top surface of the other end of the laminated piezoelectric element 70. The pump case 20 is fixed to the circumferential edge portion of the top surface o...

second exemplary embodiment

[0115] Second Exemplary Embodiment

[0116] Next, a second exemplary embodiment of the present invention will be described with reference to FIG. 4.

[0117] The pump according to the second exemplary embodiment has a basic structure similar to the aforementioned first exemplary embodiment, but is different from the first exemplary embodiment in that a part of a driving electrode 52 attached to the plate-shaped piezoelectric element 71 of the secondary pump chamber 24 is separated and forms a detecting electrode 53.

[0118]FIG. 4 is a schematic of the pump according to the second exemplary embodiment as seen from the secondary pump chamber diaphragm side. In FIG. 4, a part of the electrode 52 formed on the plate-shaped piezoelectric element 71 attached to the top surface of the secondary pump chamber diaphragm 45 is separated to form the detecting electrode 53.

[0119] Next, a function of the detecting electrode will be described. During the priming action, such as the time of starting the...

third exemplary embodiment

[0123] Third Exemplary Embodiment

[0124] Next, a third exemplary embodiment of the present invention will be described with reference to FIGS. 5 and 6. The pump according to the third exemplary embodiment has a basic structure similar to the aforementioned first exemplary embodiment, but is different from the first exemplary embodiment in that the pump includes a pressure sensor 90 in the primary pump chamber 27. Descriptions of constituent elements common to the first exemplary embodiment will be omitted.

[0125]FIG. 5 is a vertical cross-sectional schematic of the pump according to the third exemplary embodiment of the present invention, and FIG. 6 is a schematic of the driving circuit of the pump according to the third exemplary embodiment. In FIG. 5, two-stepped concave portion 35 is formed in an inside top wall of the primary pump chamber 27. The pressure sensor 90 made of the same material as the aforementioned plate-shaped piezoelectric element 71 is fixed to the step of the co...

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Abstract

To provide a pump capable of discharging gas bubbles and thus maintaining a discharging ability, even when the gas bubbles stay inside a pump chamber, a pump includes a primary pump chamber whose volume can be varied by driving a diaphragm, an inlet passage to allow a working fluid to flow into the primary pump chamber, an outlet passage to allow the working fluid to flow out of the primary pump chamber, and check valves to open and close at least the inlet passage. A resultant inertance value of the inlet passage is set to be smaller than a resultant inertance value of the outlet passage. A bubble discharging device to discharge gas bubbles remained in the primary pump chamber is further provided. As a result, it is possible to provide a pump capable of discharging gas bubbles with the bubble discharging device and thus maintain a discharging ability, even when the gas bubbles stay in the primary pump chamber.

Description

BACKGROUND OF THE INVENTION [0001] 1. Field of Invention [0002] The present invention relates to a pump to move a working fluid by varying a volume of a pump chamber by a piston or a movable wall, such as a diaphragm, and specifically to a small high-power pump. [0003] 2. Description of Related Art [0004] In the related art, there are pumps having a construction in which check valves are provided between an inlet passage and a pump chamber having a variable volume and between an outlet passage and the pump chamber, respectively. Further, in a case of a pump having a purpose of transferring liquid, there is a related art structure that a thin wall portion is provided at an upstream side or downstream side passage of a pump chamber and thus pulsation due to the liquid intermittently driven is reduced through deformation of the passage (see, Japanese Unexamined Patent Application Publication No. 2000-265963. [0005] Furthermore, there is a related art high-power pump with high reliabili...

Claims

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Application Information

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IPC IPC(8): F04B23/06F04B43/02F04B43/04
CPCF04B43/046F04B23/06
Inventor SETO, TAKESHITAKAGI, KUNIHIKO
Owner SEIKO EPSON CORP
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