JP6126948B2 - Piezoelectric pump - Google Patents

Piezoelectric pump Download PDF

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JP6126948B2
JP6126948B2 JP2013180085A JP2013180085A JP6126948B2 JP 6126948 B2 JP6126948 B2 JP 6126948B2 JP 2013180085 A JP2013180085 A JP 2013180085A JP 2013180085 A JP2013180085 A JP 2013180085A JP 6126948 B2 JP6126948 B2 JP 6126948B2
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diaphragm
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rubber magnet
liquid contact
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直也 浅井
直也 浅井
齋藤　直樹
直樹 齋藤
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Takasago Electric Inc
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Description

本発明は、接液部を駆動部から着脱可能とし、接液部を滅菌処理し或いは簡単に取り外して使い捨てることができる接液部分離型の圧電ポンプに関する。   The present invention relates to a wetted part separation type piezoelectric pump in which a wetted part can be attached to and detached from a drive part, and the wetted part can be sterilized or easily removed and discarded.

従来、各種の液体を比較的小流量で送液する小形のポンプとして、圧電素子などにより振動をダイヤフラムに付与して駆動するダイヤフラム振動型ポンプ装置が、各種の分野で使用されている。   2. Description of the Related Art Conventionally, as a small pump for feeding various liquids at a relatively small flow rate, a diaphragm vibration type pump device that is driven by applying vibration to the diaphragm by a piezoelectric element or the like has been used in various fields.

この種のポンプ装置は、内部を流れる液体に対し、特に衛生を保つ必要があるとき、ポンプ内を滅菌する必要がある。   This type of pump device needs to sterilize the inside of the pump especially when it is necessary to maintain hygiene with respect to the liquid flowing inside.

例えば、ポンプ装置を細胞培養装置などで使用し、培養液などを滅菌状態でポンプにより送液する場合、ポンプを使用する前に、ポンプ内を滅菌処理する必要がある。或いは、流す液体を交換するたびに、ポンプの接液部を使い捨てる必要がある。   For example, when a pump device is used in a cell culture device or the like and a culture solution or the like is sent by a pump in a sterilized state, the inside of the pump needs to be sterilized before the pump is used. Alternatively, it is necessary to dispose the wetted part of the pump every time the liquid to be flowed is replaced.

このため、従来、液体を流すポンプ本体と吐出チューブを含む収液部と、圧電素子及びダイヤフラムを設けたポンプアクチュエータを含む駆動部と、を分離可能とし、分離した収液部を滅菌処理する構造の給液装置が、下記特許文献１において提案されている。   For this reason, conventionally, it is possible to separate a liquid collection unit including a pump body and a discharge tube through which a liquid flows and a drive unit including a pump actuator provided with a piezoelectric element and a diaphragm, and sterilizing the separated liquid collection unit A liquid supply apparatus is proposed in Patent Document 1 below.

特開平６−２４４９２号公報JP-A-6-24492 特開２００６−２０７４３６号公報JP 2006-207436 A

しかし、上記従来の給液装置は、収液部と駆動部が分離可能に構成されることから、収液部と駆動部を組み付けたとき、そのポンプ本体側のポンプ膜とポンプアクチュエータ側の振動体を接触させるために、両面テープなどの面接合部材を着脱ごとに使用する。   However, since the conventional liquid supply device is configured such that the liquid collection unit and the drive unit are separable, when the liquid collection unit and the drive unit are assembled, vibrations on the pump membrane on the pump body side and the pump actuator side are present. In order to bring the body into contact, a surface bonding member such as a double-sided tape is used for each attachment / detachment.

このように、上記給液装置は、ポンプ膜と駆動部の振動体との接合に、両面テープなどの面接合部材を使用するため、不十分な接合状態が生じやすく、そのような場合、駆動部の振動体の振動がポンプ膜に伝達しにくくなって、伝達効率が低下し、ポンプの運転効率が低くなる。   As described above, the liquid supply device uses a surface bonding member such as a double-sided tape for bonding the pump membrane and the vibrator of the driving unit, and thus an insufficient bonding state is likely to occur. The vibration of the vibrating part of the part becomes difficult to be transmitted to the pump membrane, the transmission efficiency is lowered, and the operation efficiency of the pump is lowered.

そこで、従来、上記特許文献２において、両面テープなどの面接合部材を使用せずに、駆動ユニットと被駆動ユニットを接合させる構造の圧電ダイヤフラムポンプが提案されている。この圧電ダイヤフラムポンプは、圧電素子と駆動ダイヤフラムを備えた駆動ユニットと、ゴムシートなどの従動膜をポンプ室に張設した被駆動ユニットとを接合させて、ポンプ室の従動膜を圧電素子により振動させ、駆動する。   Therefore, in the above-described Patent Document 2, a piezoelectric diaphragm pump having a structure in which a driving unit and a driven unit are bonded without using a surface bonding member such as a double-sided tape has been proposed. In this piezoelectric diaphragm pump, a driving unit having a piezoelectric element and a driving diaphragm is joined to a driven unit in which a driven film such as a rubber sheet is stretched in a pump chamber, and the driven film in the pump chamber is vibrated by the piezoelectric element. And drive.

また、この圧電ダイヤフラムポンプは、被駆動ユニットのポンプ室の従動膜を膨出形状とし、駆動ユニットの駆動ダイヤフラムを、従動膜の膨出形状に対応した凹状形状とし、被駆動ユニットの膨出形状のポンプ室の従動膜を、駆動ユニットの凹状形状の駆動ダイヤフラムに嵌合させて接合し、駆動ダイヤフラムの振動をポンプ室の従動膜に伝達する。   In addition, this piezoelectric diaphragm pump has a driven membrane in the pump chamber of the driven unit having a bulging shape, and the driving diaphragm of the driving unit has a concave shape corresponding to the bulging shape of the driven membrane. The driven membrane of the pump chamber is fitted and joined to the concave drive diaphragm of the drive unit, and the vibration of the drive diaphragm is transmitted to the driven membrane of the pump chamber.

然るに、この従来の圧電ダイヤフラムポンプは、ポンプ室の従動膜と駆動ユニットの駆動ダイヤフラムとの接合に、両面テープなどの面接合部材を使用しないため、ポンプ室側の被駆動ユニットと駆動ユニットの着脱を、比較的簡便に行うことができるものの、ポンプ室の膨出形状の従動膜と凹状形状の駆動ダイヤフラムを単純に嵌め合わせて接合させるのみであるため、接合状態によっては、接合面に隙間が生じやすく、駆動ユニットの振動の伝達効率が低下し、ポンプの運転効率が低下する課題があった。   However, this conventional piezoelectric diaphragm pump does not use a surface bonding member such as a double-sided tape for joining the driven membrane of the pump chamber and the drive diaphragm of the drive unit, so that the driven unit on the pump chamber side and the drive unit can be attached and detached. However, depending on the joining state, there is a gap on the joint surface because the swelled follower membrane of the pump chamber and the concave drive diaphragm are simply fitted and joined. There is a problem that the vibration transmission efficiency of the drive unit is lowered and the pump operation efficiency is lowered.

本発明は、上述の課題を解決するものであり、接液部と駆動部との接合を確実に行い且つ容易に分離することができ、高い伝達効率で駆動部から接液部へ振動を伝達し、ポンプの運転効率を向上させることができる圧電ポンプを提供することを目的とする。   The present invention solves the above-described problems, and can reliably and easily separate the liquid contact portion and the drive portion, and transmits vibration from the drive portion to the liquid contact portion with high transmission efficiency. And it aims at providing the piezoelectric pump which can improve the operation efficiency of a pump.

本発明に係る圧電ポンプは、ポンプ室を覆うダイヤフラムを有した接液部と、該接液部に接合して該ダイヤフラムに振動を付与する圧電素子を有した駆動部とを備えた圧電ポンプにおいて、
該接液部は、該ダイヤフラムの外側面に取着された磁性体金属からなる磁性体ダイヤフラムを備え、
該駆動部は、該圧電素子が取着された金属板と、該金属板の外側面に取着されたゴム磁石シートとを備え、
該接液部と該駆動部を接合したとき、該接液部の該磁性体ダイヤフラムが該駆動部の該ゴム磁石シートの磁気により該ゴム磁石シートの外側面に吸着されて接合することを特徴とする。 A piezoelectric pump according to the present invention is a piezoelectric pump including a liquid contact portion having a diaphragm that covers a pump chamber, and a drive portion having a piezoelectric element that is bonded to the liquid contact portion and applies vibration to the diaphragm. ,
The liquid contact portion includes a magnetic diaphragm made of a magnetic metal attached to the outer surface of the diaphragm,
The drive unit includes a metal plate to which the piezoelectric element is attached, and a rubber magnet sheet attached to the outer surface of the metal plate,
When the wetted part and the drive part are joined, the magnetic diaphragm of the wetted part is attracted to and joined to the outer surface of the rubber magnet sheet by the magnetism of the rubber magnet sheet of the drive part. And

この発明によれば、接液部と駆動部を接合したとき、接液部の磁性体ダイヤフラムが、駆動部のゴム磁石シートの磁気により、ゴム磁石シートの外側面に吸着されて、接液部と駆動部が接合されるので、接液部と駆動部の接合と分離を確実に且つ容易に行なうことができる。また、接合状態で駆動部の圧電素子が駆動された時、駆動部の圧電素子の振動が磁性体ダイヤフラムを通して接液部のポンプ室を覆うダイヤフラムに高い伝達効率で伝達され、ポンプの運転効率を向上させることができる。   According to this invention, when the liquid contact part and the drive part are joined, the magnetic diaphragm of the liquid contact part is attracted to the outer surface of the rubber magnet sheet by the magnetism of the rubber magnet sheet of the drive part. Therefore, the liquid contact part and the drive part can be joined and separated reliably and easily. In addition, when the piezoelectric element of the drive unit is driven in the joined state, vibration of the piezoelectric element of the drive unit is transmitted with high transmission efficiency to the diaphragm covering the pump chamber of the wetted part through the magnetic material diaphragm, thereby improving the operation efficiency of the pump. Can be improved.

ここで、上記ゴム磁石シートは、ネオジム磁石粉末と合成ゴムを混合してシート状に成形したネオジムラバーマグネットから構成することが好ましい。このネオジムラバーマグネット製のゴム磁石シートを用いた駆動部は、接合時、接液部の磁性体ダイヤフラムに強力に吸着され、圧電素子の振動を非常に高い伝達効率で接液部のダイヤフラムに伝達することができる。   Here, the rubber magnet sheet is preferably composed of a neodymium rubber magnet formed by mixing neodymium magnet powder and synthetic rubber into a sheet shape. The drive unit using the rubber magnet sheet made of neodymium rubber magnet is strongly adsorbed by the magnetic diaphragm of the wetted part during joining, and the vibration of the piezoelectric element is transmitted to the diaphragm of the wetted part with very high transmission efficiency. can do.

また、上記圧電ポンプにおいて、上記駆動部のケース本体の接合側に、スペーサが上記ゴム磁石シートの外周部に取り付けられ、該スペーサの内側における該ゴム磁石シートの外側面に、板状凹部が形成され、接液部と駆動部の接合時、該板状凹部に該接液部の該ダイヤフラムが嵌入するように構成することができる。
これによれば、簡単な接合操作で、駆動部のゴム磁石シートの外側面を接液部のダイヤフラムに、正確に位置決めして接合することができる。 Further, in the piezoelectric pump, a spacer is attached to the outer peripheral portion of the rubber magnet sheet on the joint side of the case main body of the drive unit, and a plate-like recess is formed on the outer surface of the rubber magnet sheet inside the spacer. In addition, the diaphragm of the liquid contact portion can be inserted into the plate-shaped recess when the liquid contact portion and the drive portion are joined.
According to this, the outer surface of the rubber magnet sheet of the drive unit can be accurately positioned and joined to the diaphragm of the liquid contact unit by a simple joining operation.

また、上記圧電ポンプにおいて、上記接液部のケース本体と駆動部のケース本体は、各々、薄い板状に形成されるとともに、各々の外形形状が接合時に同一の外形形状となるように同じ外形輪郭線を有して形成することが好ましい。これによれば、接液部と駆動部の接合を簡単且つ正確に行なうことができる。   In the piezoelectric pump, the case main body of the liquid contact part and the case main body of the drive part are each formed in a thin plate shape, and have the same outer shape so that each outer shape becomes the same outer shape when joined. It is preferable to form with an outline. According to this, joining of a liquid-contact part and a drive part can be performed easily and correctly.

さらに、上記接液部のケース本体及びダイヤフラムは、オートクレーブによる滅菌処理が可能な耐熱性合成樹脂材料（例えば、環状オレフィンコポリマー）から成形することが好ましい。これによれば、取り外した接液部を、オートクレーブの蒸気加熱により滅菌処理することができるので、血液や細胞培養液など滅菌処理の必要な液体を送液するポンプとして簡便に使用することができる。   Furthermore, the case main body and the diaphragm of the liquid contact part are preferably molded from a heat-resistant synthetic resin material (for example, a cyclic olefin copolymer) that can be sterilized by an autoclave. According to this, since the removed liquid contact part can be sterilized by steam heating of the autoclave, it can be easily used as a pump for feeding a liquid requiring sterilization such as blood or cell culture solution. .

本発明の圧電ポンプによれば、接液部と圧電素子により駆動する駆動部との接合及び分離を容易に行うことができ、接合は確実に行なわれ、駆動部から接液部への振動の伝達効率が高くなり、ポンプの運転効率を向上させることができる。   According to the piezoelectric pump of the present invention, the liquid contact portion and the drive portion driven by the piezoelectric element can be easily joined and separated, and the joining is reliably performed, and vibration from the drive portion to the liquid contact portion is prevented. The transmission efficiency is increased, and the operation efficiency of the pump can be improved.

本発明の一実施形態を示す圧電ポンプの斜視図である。It is a perspective view of the piezoelectric pump which shows one Embodiment of this invention. 同圧電ポンプの拡大縦断面図である。It is an enlarged vertical sectional view of the same piezoelectric pump. 圧電ポンプの接液部と駆動部を分離した状態の斜視図である。It is a perspective view of the state which isolate | separated the liquid-contact part and drive part of the piezoelectric pump. 接液部の正面図である。It is a front view of a liquid-contact part. 接液部の背面図である。It is a rear view of a liquid-contact part. 駆動部の正面図である。It is a front view of a drive part. 駆動部の背面図である。It is a rear view of a drive part. 接液部と駆動部を分離した状態の拡大縦断面図である。It is an enlarged vertical sectional view in a state where the liquid contact part and the drive part are separated.

以下、本発明の一実施形態を図面に基づいて説明する。この圧電ポンプは、図１、２に示すように、ポンプ室１１を覆うダイヤフラム１２を有した接液部１と、接液部１に接合してダイヤフラム１２に振動を付与する圧電素子２２を有した駆動部２とを備え、接液部１と駆動部２とを容易に分離可能としたダイヤフラム式の圧電ポンプである。   Hereinafter, an embodiment of the present invention will be described with reference to the drawings. As shown in FIGS. 1 and 2, this piezoelectric pump has a wetted part 1 having a diaphragm 12 that covers the pump chamber 11 and a piezoelectric element 22 that joins the wetted part 1 and applies vibration to the diaphragm 12. This is a diaphragm type piezoelectric pump that includes the drive unit 2 that can be easily separated from the liquid contact unit 1 and the drive unit 2.

概略的には、圧電ポンプの接液部１は、ダイヤフラム１２の外側面に取着された磁性体金属からなる磁性体ダイヤフラム１３を備えて構成される。ポンプを駆動する駆動部２は、圧電素子２２が取着された金属板２４と、金属板２４の外側面に取着されたゴム磁石シート２３とを備えて構成される。接液部１と駆動部２は接合されて使用され、接液部１の磁性体ダイヤフラム１３が駆動部２のゴム磁石シート２３の磁気によりゴム磁石シート２３の外側面に吸着されて接合する構造である。   Schematically, the liquid contact portion 1 of the piezoelectric pump includes a magnetic diaphragm 13 made of a magnetic metal attached to the outer surface of the diaphragm 12. The drive unit 2 that drives the pump includes a metal plate 24 to which the piezoelectric element 22 is attached, and a rubber magnet sheet 23 attached to the outer surface of the metal plate 24. The wetted part 1 and the drive part 2 are joined and used, and the magnetic diaphragm 13 of the wetted part 1 is attracted to and joined to the outer surface of the rubber magnet sheet 23 by the magnetism of the rubber magnet sheet 23 of the drive part 2. It is.

接液部１のケース本体１０は、図３、４，５などに示すように、略正方形の板状に形成され、その正面外形形状は、接合される駆動部２の外形形状と同じに、つまり同じ外形輪郭線を有して形成される。接液部１のケース本体１０の正面側には、液体を吸入する吸入口部１４と液体を吐出する吐出口部１５が突出して設けられている。吸入口部１４及び吐出口部１５は通路を通して内部のポンプ室１１に連通する。   As shown in FIGS. 3, 4, 5, etc., the case main body 10 of the wetted part 1 is formed in a substantially square plate shape, and the front outer shape thereof is the same as the outer shape of the drive unit 2 to be joined, That is, they are formed with the same outline. On the front side of the case main body 10 of the liquid contact portion 1, a suction port portion 14 for sucking liquid and a discharge port portion 15 for discharging liquid are provided so as to protrude. The suction port portion 14 and the discharge port portion 15 communicate with the internal pump chamber 11 through a passage.

図８に示すように、接液部１には、ケース本体１０の背面側に、厚さの薄い円板状空間としてポンプ室１１が設けられ、吸入口部１４の吸入孔１４ａ及び吐出口部１５の吐出孔１５ａが通路を通してポンプ室１１に連通される。吸入孔１４ａには、板ゴムなどから形成される吸入弁１４ｂが設けられ、吐出孔１５ａには、同様の吐出弁１５ｂが設けられる。接液部１のポンプ室１１の外側（背面側）は、ダイヤフラム１２によって覆われ、ダイヤフラム１２の外側（背面側）には、磁性体ダイヤフラム１３が接着される。磁性体ダイヤフラム１３は、接液部１と駆動部２との接合時、駆動部２のゴム磁石シート２３が密に吸着するために設けられ、磁性体ダイヤフラム１３には例えばマルテンサイト系或いはフェライト系のステンレス板が使用される。   As shown in FIG. 8, the liquid contact portion 1 is provided with a pump chamber 11 as a thin disk-like space on the back side of the case body 10, and the suction hole 14 a and the discharge port portion of the suction port portion 14. Fifteen discharge holes 15a communicate with the pump chamber 11 through the passage. The suction hole 14a is provided with a suction valve 14b formed of a rubber plate or the like, and the discharge hole 15a is provided with a similar discharge valve 15b. The outside (back side) of the pump chamber 11 of the liquid contact part 1 is covered with a diaphragm 12, and a magnetic diaphragm 13 is bonded to the outside (back side) of the diaphragm 12. The magnetic diaphragm 13 is provided so that the rubber magnet sheet 23 of the driving unit 2 is closely adsorbed when the liquid contact unit 1 and the driving unit 2 are joined, and the magnetic diaphragm 13 has, for example, a martensite type or a ferrite type. Stainless steel plate is used.

これにより、接液部１のポンプ室１１では、ダイヤフラム１２及び磁性体ダイヤフラム１３に振動が印加され、振動によってポンプ室１１内に負圧が発生すると、吸入弁１４ｂが開いて、吸入口部１４から液体がポンプ室１１内に吸入され、振動によってポンプ室１１内に正圧が発生すると、吐出弁１５ｂが開いて、ポンプ室１１内の液体が吐出口部１５から吐出される構造となっている。   As a result, in the pump chamber 11 of the liquid contact portion 1, vibration is applied to the diaphragm 12 and the magnetic diaphragm 13, and when a negative pressure is generated in the pump chamber 11 due to the vibration, the suction valve 14 b is opened and the suction port portion 14 is opened. When the liquid is sucked into the pump chamber 11 and a positive pressure is generated in the pump chamber 11 due to vibration, the discharge valve 15b opens and the liquid in the pump chamber 11 is discharged from the discharge port portion 15. Yes.

この接液部１のケース本体１０とダイヤフラム１２は、例えば、ＣＯＣ（環状オレフィンコポリマー）等の耐熱性合成樹脂材料から成形され、また、吸入弁１４ｂと吐出弁１５ｂは耐熱性のゴムから成形され、これにより、取り外した接液部１を、オートクレーブの蒸気加熱或いは酸化エチレンガスによる滅菌処理ができるようになっている。これにより、本圧電ポンプは、血液や細胞培養液などの液体を送液する滅菌処理の可能なポンプとして使用することができる。   The case body 10 and the diaphragm 12 of the wetted part 1 are molded from a heat-resistant synthetic resin material such as COC (cyclic olefin copolymer), and the suction valve 14b and the discharge valve 15b are molded from heat-resistant rubber. Thus, the removed wetted part 1 can be sterilized by steam heating or ethylene oxide gas in an autoclave. Thereby, this piezoelectric pump can be used as a sterilizable pump capable of feeding a liquid such as blood or cell culture fluid.

一方、上記のように、ポンプを駆動する駆動部２は、圧電素子２２が取着された金属板２４と、金属板２４の外側面に取着されたゴム磁石シート２３とを備えて構成される。駆動部２のケース本体２０は、図３、６，７などに示すように、略正方形の板状で内部に薄い空間を設けて形成され、その正面視の外形形状は、接合される接液部１の外形形状（外形輪郭線）と同じに形成される。ケース本体２０内には、金属板２４の裏面に接着された圧電素子２２が配設され、金属板２４の外側面（背面側）には、ゴム磁石シート２３が接着される。   On the other hand, as described above, the drive unit 2 that drives the pump includes the metal plate 24 to which the piezoelectric element 22 is attached and the rubber magnet sheet 23 attached to the outer surface of the metal plate 24. The The case main body 20 of the drive unit 2 is formed in a substantially square plate shape with a thin space inside as shown in FIGS. 3, 6, 7, etc. It is formed in the same shape as the outer shape (outer contour line) of the part 1. A piezoelectric element 22 bonded to the back surface of the metal plate 24 is disposed in the case body 20, and a rubber magnet sheet 23 is bonded to the outer surface (back surface side) of the metal plate 24.

ゴム磁石シート２３には、合成ゴムにネオジム磁石の粉末を混合してシート状に成形したネオジムラバーマグネットが使用される。ネオジムラバーマグネット製のゴム磁石シート２３は、非常に強力な磁力を発生するため、接液部１に駆動部２を接合させたとき、接液部１の磁性体ダイヤフラム１３がゴム磁石シート２３に確実に吸着され、圧電素子２２の振動を高い伝達効率で接液部１のダイヤフラム１２に伝達するようになっている。   As the rubber magnet sheet 23, a neodymium rubber magnet formed by mixing synthetic rubber with a powder of neodymium magnet and forming it into a sheet shape is used. Since the rubber magnet sheet 23 made of neodymium rubber magnet generates a very strong magnetic force, when the drive unit 2 is joined to the liquid contact part 1, the magnetic diaphragm 13 of the liquid contact part 1 is applied to the rubber magnet sheet 23. It is reliably adsorbed and the vibration of the piezoelectric element 22 is transmitted to the diaphragm 12 of the wetted part 1 with high transmission efficiency.

圧電素子２２が一面に接着された金属板２４は、リン青銅などのばね弾性を有した薄い金属板から形成され、圧電素子２２の振動によって良好に振動し、その振動を、ゴム磁石シート２３を介して接液部１のダイヤフラム１２に印加する構造である。   The metal plate 24 having the piezoelectric element 22 bonded to one surface is formed of a thin metal plate having spring elasticity such as phosphor bronze, and vibrates favorably due to the vibration of the piezoelectric element 22, and the vibration is applied to the rubber magnet sheet 23. And is applied to the diaphragm 12 of the wetted part 1.

また、導電性を有する金属板２４は、圧電素子２２の一方の電極部を兼用しており、外部から接続される電源線２９は、この金属板２４と圧電素子２２の外側面に設けた電極部に接続される。電源線２９は図示しない電源回路に接続され、圧電素子２２には、電源回路から、例えば電圧６０〜２５０Ｖ（ｐ−ｐ）、１０〜６０Ｈｚの周波数の交流電圧が印加され、圧電素子２２が駆動される。   Further, the conductive metal plate 24 also serves as one electrode portion of the piezoelectric element 22, and the power line 29 connected from the outside is an electrode provided on the outer surface of the metal plate 24 and the piezoelectric element 22. Connected to the part. The power supply line 29 is connected to a power supply circuit (not shown), and the piezoelectric element 22 is applied with an AC voltage having a voltage of 60 to 250 V (pp) and a frequency of 10 to 60 Hz from the power supply circuit to drive the piezoelectric element 22. Is done.

図３、８に示すように、駆動部２のケース本体２０の内側には、矩形枠状のスペーサ２１がケース本体２０の外縁部に添ってゴム磁石シート２３の外周部を囲うように設けられる。この枠状のスペーサ２１は、その内側に板状凹部２５が形成され、接液部１と駆動部２の接合時、この板状凹部２５内に接液部１のダイヤフラム１２が嵌入するようになっている。   As shown in FIGS. 3 and 8, a rectangular frame spacer 21 is provided inside the case main body 20 of the driving unit 2 so as to surround the outer peripheral portion of the rubber magnet sheet 23 along the outer edge of the case main body 20. . The frame-shaped spacer 21 has a plate-shaped recess 25 formed on the inside thereof, and the diaphragm 12 of the liquid-contacting portion 1 is fitted into the plate-shaped recess 25 when the liquid-contacting portion 1 and the driving portion 2 are joined. It has become.

また、スペーサ２１内の板状凹部２５の形状は、図２，８に示すように、接液部１のダイヤフラム１２及び磁性体ダイヤフラム１３が位置決めされた状態で、嵌入するように形成される。これにより、接液部１と駆動部２が接合されたとき、接液部１のダイヤフラム１２及び磁性体ダイヤフラム１３が、板状凹部２５内に、正確に位置決めされて嵌入し、磁性体ダイヤフラム１３がゴム磁石シート２３に対し正確に位置決めされて吸着されるようになっている。   Further, as shown in FIGS. 2 and 8, the shape of the plate-like recess 25 in the spacer 21 is formed so as to be fitted with the diaphragm 12 and the magnetic diaphragm 13 of the liquid contact portion 1 positioned. As a result, when the wetted part 1 and the drive part 2 are joined, the diaphragm 12 and the magnetic diaphragm 13 of the wetted part 1 are accurately positioned and fitted in the plate-like recess 25, and the magnetic diaphragm 13 is inserted. Is positioned accurately and attracted to the rubber magnet sheet 23.

上記のように、駆動部２のケース本体２０は、図３、６，７に示す如く、略正方形の板状で内部に薄い空間を設けて形成され、その外形形状は、接合される接液部１の外形形状と同じに形成される。また、図１のように、接液部１と駆動部２が接合された場合、各々のケース本体１０，２０の外形形状は、接合時に同一の外形形状となるように同じ外形輪郭線を有して形成され、特に、ケース本体１０，２０の正面視で現れる４つの角部は、３つの角部が三角形に切除され、右上の１つの角部のみが直角角部として形成される。   As described above, the case main body 20 of the driving unit 2 is formed in a substantially square plate shape with a thin space inside as shown in FIGS. It is formed in the same shape as the outer shape of the part 1. In addition, as shown in FIG. 1, when the wetted part 1 and the drive part 2 are joined, the outer shapes of the case bodies 10 and 20 have the same outer contour line so that they have the same outer shape at the time of joining. In particular, four corners appearing in a front view of the case main bodies 10 and 20 are formed such that three corners are cut into a triangle, and only one upper right corner is formed as a right angle corner.

これにより、使用者が接液部１と駆動部２を接合する際、視覚的に容易に確認可能な、３つの三角形の角部と１つの直角状の角部を容易に合わせるように接合することができ、使用者が接液部１と駆動部２を接合したとき、簡単且つ正確に位置合わせされた状態で両者を接合できるようになっている。   As a result, when the user joins the wetted part 1 and the drive part 2, the three triangular corners and one right-angled corner that can be easily visually confirmed are joined so as to be easily matched. In addition, when the user joins the liquid contact part 1 and the drive part 2, both can be joined in a state of being easily and accurately aligned.

上記構成の圧電ポンプは、接液部１と駆動部２を接合した大きさが、例えば約２５ｍｍ×約２５ｍｍで、厚さを約６ｍｍとする、非常に小型の圧電ポンプとして製作され、血液や細胞培養液などを送液するポンプとして分析装置などで使用される。   The piezoelectric pump having the above structure is manufactured as a very small piezoelectric pump having a size in which the liquid contact part 1 and the drive part 2 are joined, for example, about 25 mm × about 25 mm and a thickness of about 6 mm. It is used in analyzers as a pump for feeding cell culture fluid.

接液部１のケース本体１０の吸入口部１４には、図示しない吸入チューブが接続され、吐出口部１５には吐出チューブが接続され、駆動部２から導出される電源線２９は図示しない電源回路に接続される。接液部１と駆動部２は、図１，２のように接合した状態で使用され、接合状態では、接液部１の磁性体ダイヤフラム１３が駆動部２のゴム磁石シート２３に、確実に吸着された状態となる。   A suction tube (not shown) is connected to the suction port portion 14 of the case body 10 of the liquid contact portion 1, a discharge tube is connected to the discharge port portion 15, and a power supply line 29 led out from the drive unit 2 is a power source (not shown). Connected to the circuit. The liquid contact part 1 and the drive part 2 are used in a joined state as shown in FIGS. 1 and 2, and in the joined state, the magnetic diaphragm 13 of the liquid contact part 1 is securely attached to the rubber magnet sheet 23 of the drive part 2. It will be in the adsorbed state.

電源回路から電源を供給して圧電ポンプの駆動部２を駆動すると、交流電圧が圧電素子２２に印加され、圧電素子２２は、その交流電圧の周波数に応じた周波数（例えば１０Ｈｚ〜６０Ｈｚ）で振動し、その振動が金属板２４及びゴム磁石シート２３を介して、接液部１の磁性体ダイヤフラム１３及びダイヤフラム１２に伝達され、ポンプ室１１に接するダイヤフラム１２が振動する。   When power is supplied from the power supply circuit to drive the drive unit 2 of the piezoelectric pump, an alternating voltage is applied to the piezoelectric element 22, and the piezoelectric element 22 vibrates at a frequency (for example, 10 Hz to 60 Hz) according to the frequency of the alternating voltage. The vibration is transmitted to the magnetic diaphragm 13 and the diaphragm 12 of the liquid contact part 1 through the metal plate 24 and the rubber magnet sheet 23, and the diaphragm 12 in contact with the pump chamber 11 vibrates.

このとき、ダイヤフラム１２の振動によって、ポンプ室１１内に負圧が生じると、吐出弁１５ｂが閉じて吸入弁１４ｂが開き、吸入口部１４の吸入孔１４ａから液体がポンプ室１１内に入り、ポンプ室１１内に正圧が生じると、吸入弁１４ｂが閉じて吐出弁１５ｂが開き、吐出口部１５から液体が吐出され、液体の送液が行なわれる。   At this time, when a negative pressure is generated in the pump chamber 11 due to the vibration of the diaphragm 12, the discharge valve 15b is closed and the suction valve 14b is opened, and the liquid enters the pump chamber 11 from the suction hole 14a of the suction port portion 14, When a positive pressure is generated in the pump chamber 11, the suction valve 14b is closed and the discharge valve 15b is opened, the liquid is discharged from the discharge port portion 15, and the liquid is fed.

このときのポンプの送液流量は、圧電素子２２に供給される電源の交流電圧（例えば６０〜２５０Ｖｐ−ｐ）または周波数（例えば１０〜６０Ｈｚ）を制御することにより、調整される。このように、接液部１と駆動部２の接合状態で、駆動部２のゴム磁石シート２３が接液部１のダイヤフラム１２の磁性体ダイヤフラム１３に密に吸着され、ゴム磁石シート２３には金属板２４を介して圧電素子２２が接着されるので、圧電素子２２が駆動された時、駆動部２の圧電素子２２の振動が磁性体ダイヤフラム１３を通して接液部１のポンプ室１１を覆うダイヤフラム１２に高い伝達効率で伝達され、これによりポンプは高い運転効率で送液を行うことができる。   The pumping liquid flow rate at this time is adjusted by controlling the AC voltage (for example, 60 to 250 Vp-p) or the frequency (for example, 10 to 60 Hz) of the power source supplied to the piezoelectric element 22. In this way, the rubber magnet sheet 23 of the drive unit 2 is closely adsorbed to the magnetic diaphragm 13 of the diaphragm 12 of the liquid contact unit 1 in the joined state of the liquid contact unit 1 and the drive unit 2, and the rubber magnet sheet 23 Since the piezoelectric element 22 is bonded via the metal plate 24, when the piezoelectric element 22 is driven, vibration of the piezoelectric element 22 of the drive unit 2 passes through the magnetic diaphragm 13 and covers the pump chamber 11 of the liquid contact unit 1. 12 is transmitted with high transmission efficiency, so that the pump can feed liquid with high operation efficiency.

そして、血液分析や細胞培養液の送液の１工程が終了し、別の血液や培養液を送液する場合、接液部１を駆動部２から取り外し、使い捨てる。このとき、接液部１は駆動部２に対しゴム磁石シート２３の磁力により強力に吸着されているため、取り外し操作が難しい場合が考えられるが、接液部１のケース本体１０と駆動部２のスペーサ２１との間の接合部分に、例えば使用者が爪をかけることができる程度の小隙間や小凹部を設けておけば、使用者はそこに爪をかけて接液部１を剥がすように分離することができる。   When one step of blood analysis or cell culture solution feeding is completed and another blood or culture solution is fed, the wetted part 1 is removed from the driving unit 2 and is discarded. At this time, since the wetted part 1 is strongly adsorbed by the magnetic force of the rubber magnet sheet 23 with respect to the drive part 2, it may be difficult to remove it. However, the case main body 10 and the drive part 2 of the wetted part 1 are considered. If, for example, a small gap or a small recess is provided at the joint between the spacer 21 and the user so that the user can put the nail, the user puts the nail on the joint and peels off the wetted part 1. Can be separated.

また、接液部１はオートクレーブの高圧蒸気或いは酸化エチレンガスにより滅菌処理されるが、そこには圧電素子などの電気部品は含まれず、そのケース本体１０、ダイヤフラム１２、磁性体ダイヤフラム１３、吸入弁１４ｂ、吐出弁１５ｂは耐熱性を有しているため、劣化せずに良好に滅菌処理することができる。   Further, the wetted part 1 is sterilized by high pressure steam or ethylene oxide gas of an autoclave, but does not include electrical parts such as piezoelectric elements, and the case main body 10, the diaphragm 12, the magnetic diaphragm 13, the suction valve. Since 14b and the discharge valve 15b have heat resistance, they can be sterilized well without deterioration.

そして、再度、圧電ポンプを使用する際、滅菌後の接液部１を駆動部２に接合させて再び図１の状態として使用する。このとき、図８に示すように、接液部１のケース本体１０と駆動部２のケース本体２０とが同じ外形形状（外形輪郭線）で形成され、且つ接液部１のダイヤフラム１２と磁性体ダイヤフラム１３が、それに対応した形状を持つ駆動部２のスペーサ２１内の板状凹部２５に嵌入されるので、使用者は、接液部１のケース本体１０と駆動部２のケース本体２０の外周の各辺を合わせるように接合させれば、接液部１のダイヤフラム１２と磁性体ダイヤフラム１３が駆動部２の板状凹部２５内に正確に位置決めされた状態で嵌入し、磁性体ダイヤフラム１３がゴム磁石シート２３の外側面に正確に吸着されて、接液部１と駆動部２を良好に接合することができる。   When the piezoelectric pump is used again, the sterilized liquid contact portion 1 is joined to the drive portion 2 and used again as shown in FIG. At this time, as shown in FIG. 8, the case main body 10 of the liquid contact part 1 and the case main body 20 of the drive part 2 are formed with the same outer shape (outer outline), and the diaphragm 12 of the liquid contact part 1 and the magnetism Since the body diaphragm 13 is inserted into the plate-like recess 25 in the spacer 21 of the drive unit 2 having a shape corresponding to the diaphragm 13, the user can connect the case main body 10 of the liquid contact unit 1 and the case main body 20 of the drive unit 2. If it joins so that each edge | side of outer periphery may match | combine, the diaphragm 12 and the magnetic body diaphragm 13 of the liquid-contacting part 1 will be inserted in the state positioned correctly in the plate-shaped recessed part 25 of the drive part 2, and the magnetic body diaphragm 13 will be fitted. Is accurately attracted to the outer surface of the rubber magnet sheet 23, and the wetted part 1 and the drive part 2 can be joined well.

このように、接液部１と駆動部２を接合したとき、接液部１の磁性体ダイヤフラム１３が、駆動部２のゴム磁石シート２３の磁気により、ゴム磁石シート２３の外側面に吸着されて、接液部１と駆動部２が接合されるので、接液部１と駆動部２の接合を確実に且つ容易に行なうことができる。また、接液部１のダイヤフラム１２と駆動部２のゴム磁石シート２３の内側の圧電素子２２の位置合わせも正確に行なうことができ、簡単な操作で接液部１と駆動部２の接合と分離を容易に行うことができる。   Thus, when the wetted part 1 and the drive part 2 are joined together, the magnetic diaphragm 13 of the wetted part 1 is attracted to the outer surface of the rubber magnet sheet 23 by the magnetism of the rubber magnet sheet 23 of the drive part 2. Thus, since the liquid contact part 1 and the drive part 2 are joined, the liquid contact part 1 and the drive part 2 can be joined reliably and easily. Further, the diaphragm 12 of the liquid contact portion 1 and the piezoelectric element 22 inside the rubber magnet sheet 23 of the drive portion 2 can be accurately aligned, and the liquid contact portion 1 and the drive portion 2 can be joined by a simple operation. Separation can be performed easily.

１ 接液部
２ 駆動部
１０ ケース本体
１１ ポンプ室
１２ ダイヤフラム
１３ 磁性体ダイヤフラム
１４ 吸入口部
１４ａ 吸入孔
１４ｂ 吸入弁
１５ 吐出口部
１５ａ 吐出孔
１５ｂ 吐出弁
２０ ケース本体
２１ スペーサ
２２ 圧電素子
２３ ゴム磁石シート
２４ 金属板
２５ 板状凹部
２９ 電源線 DESCRIPTION OF SYMBOLS 1 Liquid contact part 2 Drive part 10 Case main body 11 Pump chamber 12 Diaphragm 13 Magnetic body diaphragm 14 Suction port part 14a Suction hole 14b Suction valve 15 Ejection port part 15a Ejection hole 15b Ejection valve 20 Case main body 21 Spacer 22 Piezoelectric element 23 Rubber magnet Sheet 24 Metal plate 25 Plate-shaped recess 29 Power line

Claims (5)

ポンプ室を覆うダイヤフラムを有した接液部と、該接液部に接合して該ダイヤフラムに振動を付与する圧電素子を有した駆動部とを備えた圧電ポンプにおいて、
該接液部は、該ダイヤフラムの外側面に取着された磁性体金属からなる磁性体ダイヤフラムを備え、
該駆動部は、該圧電素子が取着された金属板と、該金属板の外側面に取着されたゴム磁石シートとを備え、
該接液部と該駆動部を接合したとき、該接液部の該磁性体ダイヤフラムが該駆動部の該ゴム磁石シートの磁気により該ゴム磁石シートの外側面に吸着されて接合することを特徴とする圧電ポンプ。 In a piezoelectric pump comprising a liquid contact portion having a diaphragm covering the pump chamber, and a drive portion having a piezoelectric element that is bonded to the liquid contact portion and imparts vibration to the diaphragm.
The liquid contact portion includes a magnetic diaphragm made of a magnetic metal attached to the outer surface of the diaphragm,
The drive unit includes a metal plate to which the piezoelectric element is attached, and a rubber magnet sheet attached to the outer surface of the metal plate,
When the wetted part and the drive part are joined, the magnetic diaphragm of the wetted part is attracted to and joined to the outer surface of the rubber magnet sheet by the magnetism of the rubber magnet sheet of the drive part. Piezoelectric pump. 前記ゴム磁石シートは、ネオジム磁石粉末と合成ゴムを混合してシート状に成形したネオジムラバーマグネットから構成されたことを特徴とする請求項１記載の圧電ポンプ。   2. The piezoelectric pump according to claim 1, wherein the rubber magnet sheet is composed of a neodymium rubber magnet formed by mixing neodymium magnet powder and synthetic rubber into a sheet shape. 前記駆動部のケース本体の接合側には、スペーサが前記ゴム磁石シートの外周部に取り付けられて、該スペーサの内側における該ゴム磁石シートの外側面に、板状凹部が形成され、接液部と駆動部の接合時、該板状凹部に該接液部の該ダイヤフラムが嵌入することを特徴とする請求項１記載の圧電ポンプ。   A spacer is attached to the outer peripheral portion of the rubber magnet sheet on the joint side of the case main body of the drive unit, and a plate-like concave portion is formed on the outer surface of the rubber magnet sheet inside the spacer. 2. The piezoelectric pump according to claim 1, wherein the diaphragm of the liquid contact portion is fitted into the plate-like concave portion when the drive portion and the drive portion are joined. 前記接液部のケース本体と駆動部のケース本体は、各々、薄い板状に形成されるとともに、各々の外形形状が接合時に同一の外形形状となるように同じ外形輪郭線を有して形成されたことを特徴とする請求項１記載の圧電ポンプ。   The case main body of the liquid contact part and the case main body of the driving part are each formed in a thin plate shape and have the same outer contour line so that each outer shape becomes the same outer shape when joined. The piezoelectric pump according to claim 1, wherein the piezoelectric pump is provided. 前記接液部のケース本体及びダイヤフラムは、オートクレープによる滅菌処理が可能な耐熱性合成樹脂材料から成形されたことを特徴とする請求項１記載の圧電ポンプ。   2. The piezoelectric pump according to claim 1, wherein the case main body and the diaphragm of the wetted part are molded from a heat-resistant synthetic resin material that can be sterilized by autoclaving.
JP2013180085A 2013-08-30 2013-08-30 Piezoelectric pump Expired - Fee Related JP6126948B2 (en)

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