WO2012142922A1 - 压电泵和其阀片 - Google Patents

压电泵和其阀片 Download PDF

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Publication number
WO2012142922A1
WO2012142922A1 PCT/CN2012/073871 CN2012073871W WO2012142922A1 WO 2012142922 A1 WO2012142922 A1 WO 2012142922A1 CN 2012073871 W CN2012073871 W CN 2012073871W WO 2012142922 A1 WO2012142922 A1 WO 2012142922A1
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WIPO (PCT)
Prior art keywords
valve
piezoelectric pump
valve plate
frame
pump
Prior art date
Application number
PCT/CN2012/073871
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English (en)
French (fr)
Inventor
林淑媛
曹孝平
曹伟祥
Original Assignee
Lin Shuyuan
Cao Xiaoping
Cao Weixiang
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Application filed by Lin Shuyuan, Cao Xiaoping, Cao Weixiang filed Critical Lin Shuyuan
Publication of WO2012142922A1 publication Critical patent/WO2012142922A1/zh

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B43/00—Machines, pumps, or pumping installations having flexible working members
    • F04B43/02—Machines, pumps, or pumping installations having flexible working members having plate-like flexible members, e.g. diaphragms
    • F04B43/04—Pumps having electric drive
    • F04B43/043—Micropumps
    • F04B43/046—Micropumps with piezoelectric drive

Definitions

  • the present invention relates to a micropump, and more particularly to a piezoelectric pump using a piezoelectric ceramic sheet as an energy conversion device and a valve plate for use therewith. Background technique
  • Piezoelectric pumps are a new type of fluid drive. It does not require an additional drive motor, but uses the piezoelectric effect of the piezoelectric ceramic to deform the piezoelectric vibrator, and then the volume change of the pump chamber is caused by the deformation to realize the fluid output or the piezoelectric vibrator is used to generate the fluctuation to transmit the liquid.
  • the pump combines the driving source part, the transmission part and the pump body of the conventional pump to realize the single structure, small volume, light weight, low energy consumption, no noise, no electromagnetic interference, and can be controlled according to the applied voltage or frequency.
  • Output small flow can be widely used in small mobile devices, CPUs and video cards, game consoles, notebooks, blade servers, photovoltaic cells, LED lights, home appliances, medical equipment, petrochemical equipment, biomedical, automotive and aviation Product support for fluid delivery technology solutions such as electronic equipment.
  • the piezoelectric pump consists of a piezoelectric vibrator, a pump valve and a pump body.
  • the working principle is: When the alternating current power source U is applied to both ends of the piezoelectric vibrator, the piezoelectric vibrator is radially compressed under the action of an electric field, and a tensile stress is generated inside, thereby causing the piezoelectric vibrator to bend and deform.
  • the pump chamber volume increases, the fluid pressure in the chamber decreases, the fluid inlet pump valve opens, the fluid outlet pump valve closes, and the liquid enters the pump chamber;
  • the pump The volume of the chamber is reduced, the fluid pressure in the chamber is increased, the fluid inlet pump valve is closed, the fluid outlet pump valve is opened, and the pump chamber liquid is squeezed out to form a gentle continuous directional flow.
  • Piezoelectric pumps are an emerging industry area, and there are still many studies of the basic work of technology that have not been thoroughly cut. The main problem is that the mating connection between the parts is not precise, which directly leads to the loss of energy.
  • the valve frame and the valve plate are installed and positioned, and the structure of the valve plate still has many areas to be improved. Summary of the invention
  • An object of the present invention is to provide a valve plate for a piezoelectric pump and a piezoelectric pump;
  • the performance index of the piezoelectric pump is improved from the aspects of installation, positioning and development of the piezoelectric pump valve frame, the transducer sheet, and the valve piece.
  • the piezoelectric pump provided by the present invention comprises a pump body formed by sealingly connecting upper and lower casings, a valve frame disposed in the pump body, a valve plate mounted on the valve frame, a lower valve plate and a transducing piece connected to the lower casing;
  • the outer wall of the valve frame is positioned in close cooperation with the inner wall of the lower casing.
  • a valve plate for use with the piezoelectric pump is provided, the valve
  • the sheets are made of soft rubber material and are respectively fixed on the upper and lower sides of the valve frame, opposite to the water inlet and the water outlet; after installation, the cylinder of the valve frame generates tensile stress on the valve piece.
  • the upper case and the lower case are usually integrally formed by screw connection or ultrasonic welding.
  • the outer wall of the valve frame and the inner wall surface of the lower casing are designed as matching cylindrical faces.
  • valve plate is riveted to the underside of the valve frame.
  • the valve in order to generate the pre-tightening force, the valve is not pressure-relieved, and the opening is reliable.
  • the lateral center distance of the valve frame cylinder is designed to be greater than the lateral center distance of the mounting hole of the valve plate, and the longitudinal center distance of the valve frame cylinder is greater than The longitudinal center distance of the valve mounting hole.
  • the cylinders of the valve frame and the mounting holes provided in the valve sheets are arranged in a centrally symmetrical or uniform manner.
  • the valve plate is streamlined at the surface through which the fluid flows.
  • the fluid inflow face of the valve plate is provided with a flow guiding cone.
  • the cylindrical surface of the valve frame and the cylindrical surface of the lower casing are in a tight fit.
  • the valve plate of the pump is a sheet made of soft rubber material (such as silica gel, soft PE), which is mounted on the upper and lower sides of the valve frame by riveting (such as hot riveting). After installation, the cylinder of the valve frame generates pre-tensioning stress on the valve plate.
  • the surface of the valve has no abrupt change, no sharpness, and is preferably streamlined.
  • the fluid inflow end is formed with a flow guiding cone, and the mounting hole for riveting is center-symmetrical or evenly distributed. Thereby, the useless work can be effectively reduced, the work stability and reliability can be improved, and the efficiency of the pump can be improved.
  • Figure 1 is a front elevational view of a piezoelectric pump according to an embodiment of the present invention.
  • Figure 2 is a right cross-sectional view of the piezoelectric pump of the embodiment of the present invention.
  • Figure 3 is a bottom cross-sectional view of a piezoelectric pump in accordance with an embodiment of the present invention.
  • Figure 4 is a front elevational view of the valve holder of the piezoelectric pump of the embodiment of the present invention.
  • Figure 5 is a cross-sectional view showing a valve holder of a piezoelectric pump according to an embodiment of the present invention.
  • Figure 6 is a perspective view of a lower case of a piezoelectric pump according to an embodiment of the present invention.
  • Figure 7 is a front elevational view of a valve plate in accordance with an embodiment of the present invention.
  • Figure 8 is a bottom plan view of a valve plate in accordance with an embodiment of the present invention. detailed description
  • FIG. 1, FIG. 2 and FIG. 3 are structural diagrams of a piezoelectric pump according to the present invention, and are a double valve pump, the pump including a lower case 1, a first sealing port 2, and a second Sealing the cymbal 3, the valve frame 4, the valve plate 5, the transducer sheet 6 and the upper casing 7 and the like.
  • the upper casing 7 is restrained in the notch 114 of the lower casing 1 and integrally joined by screwing or ultrasonic welding.
  • the first sealing jaw 2 is placed in the square groove 113 of the lower case 1.
  • the second sealing jaw 3 is placed in the slotted recess 110 of the valve holder 4.
  • the valve sheets 5 are respectively mounted above and below the valve frame 4, and are opposed to the water inlet 111 and the water outlet 112.
  • the valve piece 5 in this embodiment is made of silica gel and has a hardness of about 60 degrees Shore.
  • the fluid inflow side is provided with a flow guiding cone 103, and the surface through which the fluid flows is streamlined, so that it can effectively reduce the fluid flow process.
  • the sudden change in resistance and acceleration reduces the consumption of useless work.
  • the mounting holes 104 of the valve plate 5 and the cylinder 105 of the valve frame 4 are arranged in a centrally symmetrical manner, and the two parts of Figs. 4, 5 and 7, and 8 are riveted together by hot riveting.
  • the height direction plane 107 of the valve frame 4 abuts against the lower plane 108 of the valve plate 5, while the water inlet 111 (arrow direction) of the valve frame 4 has a small flange upper surface 106 which also bears against the lower plane 108 of the valve plate 5. Since the lateral center distance a of the cylinder 105 of the valve frame 4 is slightly larger than the lateral center distance c of the mounting hole 104 of the valve plate 5, the longitudinal center distance b of the cylinder 105 of the valve frame 4 is slightly larger than the longitudinal center of the mounting hole 104 of the valve plate 5.
  • the distance d and the valve plate 5 are elastic, and the valve frame 4 generates a pulling force on the valve plate 5, so that the lower plane 108 of the valve plate 5 is in close contact with the small flange upper surface 106 of the water inlet 111 (arrow direction) of the valve frame 4,
  • the reliability of the sealing of the piezoelectric pump valve plate when it is closed is ensured, and the reliability of the opening of the piezoelectric pump valve is ensured.
  • the two valve plates 5 are respectively riveted to the valve frame 4, and the lower portion is formed at a position opposite to the water inlet 111 and the water outlet 112.
  • the cylindrical surface 101 of the valve frame 4 and the cylindrical inner surface 102 of the lower casing 1 are assembled in a tight fit manner. In one.
  • the groove notch 110 of the valve frame 4 is placed on the second sealing jaw 3, and the large flange upper surface 109 of the valve frame 4 supports the transducer sheet 6, which is outside the transducer sheet 6.
  • the cylindrical inner surface 102 of the rim and the lower casing 1 is also positioned in a tight fit. Since the outer edge of the transducer sheet 6 and the cylindrical surface of the valve holder 4 are positioned in a tight fit with the cylindrical inner surface 102 of the lower casing 1, the transducer sheet 6 has no space for radial expansion, thereby enabling the transducer sheet.
  • the radial telescopic motion of 6 is converted into bending deformation and reciprocating motion in the direction of the circular axis. Since the limit is at the largest outer edge of the transducer sheet 6, the bending deformation of the transducer sheet 6 is maximized according to the principle of the lever. Therefore, the efficiency of the pump is also maximized.
  • the double valve pump becomes a single valve pump.
  • the fluid flows through the pump chamber from the direction of the arrow shown in Figure 2.
  • the inlet 111 (arrow direction) opens, the outlet 112 (arrow direction) closes; when the pump volume decreases , Inlet 111 (in the direction of the arrow) The valve is closed, and the water outlet 112 (in the direction of the arrow) opens.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)

Description

压电泵和其阀片 技术领域
本发明涉及微型泵， 尤其涉及一种以压电陶瓷片为能量转换装置的压 电泵及其配合使用的阀片。 背景技术
压电泵是种新型流体驱动器。 它不需要附加驱动电机， 而是利用压电 陶瓷的压电效应使压电振子产生变形， 再由变形产生泵腔的容积变化实现 流体输出或者利用压电振子产生波动来传输液体， 由于压电泵将传统泵的 驱动源部分、 传动部分及泵体三者合为一体， 实现结构筒单、 体积小、 重 量轻、 耗能低、 无噪声、 无电磁干扰， 并可根据施加电压或频率控制输出 微小流量， 可广泛应用于小型移动设备、 CPU及显示卡、 游戏机控制板、 笔记本电脑、 刀片服务器、 光生伏打电池、 LED灯、 家电、 医疗器械、 石 化设备、 生物医学、 汽车和航空电子设备等流体输送技术方案的产品配套。
压电泵由压电振子、 泵阀和泵体组成。 其工作原理是； 当压电振子两 端施加交流电源 U时，压电振子在电场作用下径向压缩， 内部产生拉应力， 从而使压电振子弯曲变形。 当压电振子正向弯曲时， 泵腔容积增大， 腔内 流体压力减小， 流体进口泵阀打开， 流体出口泵阀关闭， 液体进入泵腔； 当压电振子向反向弯曲时， 泵腔容积减小， 腔内流体压力增大， 流体进口 泵阀关闭， 流体出口泵阀打开， 泵腔液体被挤压排出， 形成平緩的连续不 断的定向流动。
压电泵是一个新兴的产业领域， 目前仍然有许多技术基础工作的研究 没有做透切。 主要的问题是各零件之间的配合连接不精密， 直接导致能量 的散失， 如阀架与阀片的安装定位方法， 阀片的结构形式等方面仍有不少 有待改进的地方。 发明内容
本发明的目的在于提供一种压电泵和压电泵的阀片；
根据本发明的一个方面， 从压电泵阀架、 换能片、 阀片类零件的安装 定位、 开发设计方面来提升压电泵的性能指标。
本发明提供的压电泵， 包括上、 下壳密封连接形成的泵体， 设置在泵 体内的阀架， 安装在阀架上、 下面的阀片以及与下壳连接的换能片； 所述 的阀架外壁与下壳内壁为紧配合定位。
根据本发明的另一个方面， 提供了与该压电泵配合使用的阀片， 该阀 片为软胶材料制成， 分别固定于阀架的上、 下面， 与进水口和出水口相对； 安装后阀架的柱体对阀片产生拉应力。 在一些实施方式中， 为了便于连接， 通常将上壳与下壳之间经螺釘连接或超声波焊接密封连接形成一体。
在一些实施方式中， 为了达到更精密的配合， 将阀架外壁与下壳内壁 表面设计为匹配的圓柱面。
在一些实施方式中， 为了连接牢固， 将阀片采用铆接方式固定于阀架 上下面。
在一些实施方式中， 为了产生预紧力， 阀门不泄压， 开启可靠， 设计 成阀架柱体的横向中心距离大于阀片的安装孔的横向中心距离， 阀架柱体 的纵向中心距离大于阀片安装孔的纵向中心距离。
在一些实施方式中， 为了定位更加准确， 阀架的柱体和阀片开设的安 装孔是以中心对称或均布的方式布置。
在一些实施方式中， 为了减少流体流动的阻力和加速度突变， 从而提 高能量转化的效率， 阀片在流体流经的表面呈流线型。
在一些实施方式中， 为有效地降低无用功的消耗， 提高其工作稳定性 和可靠性， 阀片的流体流入面设有导流锥。
阀架的圓柱面与下壳的圓柱面为紧配合定位。 该泵的阀片是用软胶材 料（如硅胶、 软 PE ) 制成的薄片， 用铆接（如热铆） 的方式在阀架的上下 面安装定位。 安装后阀架的柱体对阀片产生预拉应力。 阀的表面无突变、 无尖锐， 最好是流线型， 其流体流入端形成有导流锥， 铆接用的安装孔和 柱体呈中心对称， 或均匀分布。 由此， 能有效地降低无用功， 提高工作稳 定性和可靠性， 并提升了泵的效率。 附图说明
图 1是本发明实施例压电泵的主视图。
图 2是本发明实施例压电泵的右剖视图。
图 3是本发明实施例压电泵的仰剖视图。
图 4是本发明实施例压电泵的阀架的主视图。
图 5是本发明实施例压电泵的阀架的剖视图。
图 6是本发明实施例压电泵的下壳的立体图。
图 7是本发明实施例阀片的主视图。
图 8是本发明实施例阀片的仰视图。 具体实施方式
以下结合附图和具体实施例， 对本发明进行更详细地说明。 参考图 1至图 8,如图 1、图 2和图 3所示是本发明中压电泵的结构图， 且为双阀泵， 该泵包括下壳 1、 第一密封圏 2、 第二密封圏 3、 阀架 4、 阀 片 5、 换能片 6和上壳 7等零件。 上壳 7在下壳 1的缺口 114中限位并用 螺釘连接或超声波焊接连结成一体。第一密封圏 2放置于下壳 1的方槽 113 中。 第二密封圏 3放置于阀架 4的槽型缺口 110内。 阀片 5分别安装在阀 架 4的上、 下面， 并与进水口 111和出水口 112相对。
本实施例中的阀片 5用硅胶制作， 硬度在邵氏 60度左右， 其流体流入 侧做有导流锥 103 , 流体流过的表面做成流线型，从而它能有效地减小流体 流动过程中的阻力和加速度突变， 降低无用功的消耗。 阀片 5的安装孔 104 和阀架 4的柱体 105均以中心对称的方式布置， 用热铆的方式把图 4、 图 5 和图 7、 图 8中的两个零件铆接在一起。 阀架 4的高度方向的平面 107紧 贴阀片 5的下平面 108 , 同时阀架 4的进水口 111 (箭头方向） 小凸缘上表 面 106也顶住阀片 5的下平面 108。 由于阀架 4的柱体 105的横向中心距 离 a略大于阀片 5的安装孔 104横向中心距离 c ,阀架 4的的柱体 105纵向 中心距离 b略大于阀片 5的安装孔 104纵向中心距离 d且阀片 5为弹性体， 阀架 4对阀片 5产生拉力， 从而使阀片 5的下平面 108与阀架 4的进水口 111 (箭头方向）小凸缘上表面 106紧贴， 保证压电泵阀片在关闭时密封的 可靠性， 也就保证了压电泵阀的开启可靠性。 两阀片 5分别铆接于阀架 4 上、 下面与进水口 111和出水口 112相对处形成的套件以阀架 4的圓柱面 101和下壳 1的圓柱形内表面 102用紧配合的方式装配成一体。
如图 2、 图 3和图 5所示， 阀架 4的槽型缺口 110放上第二密封圏 3 , 阀架 4的大凸缘上表面 109支撑换能片 6, 换能片 6的外缘与下壳 1的圓 柱形内表面 102也以紧配合的方式定位。 由于换能片 6的外缘和阀架 4的 101圓柱面都以紧配合方式与下壳 1的圓柱形内表面 102定位，使换能片 6 没有径向伸缩的空间， 从而使换能片 6的径向伸缩运动转换为圓轴线方向 的弯曲变形和往复运动。 由于限位在换能片 6的最大外缘处， 依据杠杆原 理， 换能片 6的弯曲变形最大。 因此， 泵的效率也得到最大发挥。
根据本发明的另一实施例， 如果出水口 112 (箭头方向） 不装阀片 5 , 双阀泵就变成了单阀泵。
工作过程中， 流体从图 2所示的箭头方向流经泵腔， 泵腔体积增大时， 进 水口 111 (箭头方向） 阀门打开， 出水口 112 (箭头方向） 阀门关闭； 泵腔 体积减小时， 进水口 111 (箭头方向） 阀门关闭， 出水口 112 (箭头方向） 阀门打开。

Claims

权利要求书
1、 压电泵， 其特征在于： 包括上、 下壳密封连接形成的泵体， 设置在 泵体内的阀架， 安装在阀架上、 下面与进水口和出水口相对的阀片以及与 下壳连接的换能片； 所述的阀架外壁与下壳内壁为紧配合定位。
2、 根据权利要求 1所述的压电泵， 其特征在于： 所述的上壳与下壳之 间经螺釘连接或超声波焊接密封连接形成一体。
3、 根据权利要求 1所述的压电泵， 其特征在于： 所述的阀架外壁与下 壳内壁表面为圓柱面。
4、 根据权利要求 1或 2所述的压电泵， 其特征在于： 阀架的柱体和阀 片上设置的安装孔是以中心对称或均布的方式布置。
5、 根据权利要求 4所述的压电泵， 其特征在于： 阀架的柱体的横向中 心距离大于阀片的安装孔的横向中心距离， 阀架的柱体的纵向中心距离大 于阀片安装孔的纵向中心距离。
6、 压电泵的阀片， 其特征在于： 所述阀片为软胶材料制成， 分别固定 于阀架的上、 下面， 与设置在泵体的进水口和出水口相对； 安装后阀架的 柱体对阀片产生拉应力。
7、 根据权利要求 6所述的压电泵的阀片， 其特征在于： 所述的阀片铆 接于阀架上、 下面。
8、 根据权利要求 6所述的压电泵的阀片， 其特征在于： 所述阀片在流 体流经的表面呈流线型。
9、 根据权利要求 6所述的压电泵的阀片， 其特征在于： 所述阀片的流 体流入面设有导流锥。
PCT/CN2012/073871 2011-04-18 2012-04-12 压电泵和其阀片 WO2012142922A1 (zh)

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CN107642482A (zh) * 2016-07-22 2018-01-30 林淑媛 压电泵和其泵阀
CN114127420B (zh) * 2019-06-27 2023-11-07 株式会社村田制作所 泵装置

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