Lee UxxB5xxxxxxx Piezo Electric Disc Pump User Manual
- June 13, 2024
- LEE
Table of Contents
Lee UxxB5xxxxxxx Piezo Electric Disc Pump User Manual
1. DISCLAIMER
This resource is provided “as is” and without any warranty of any kind, and its use is at your own risk. The Lee Company does not warrant the performance or results that you may obtain by using this resource. The Lee Company makes no warranties regarding this resource, express or implied, including as to noninfringement, merchantability, or fitness for any particular purpose. To the maximum extent permitted by law The Lee Company disclaims liability for any loss or damage resulting from use of this resource, whether arising under contract, tort (including negligence), strict liability, or otherwise, and whether direct, consequential, indirect, or otherwise, even if The Lee Company has been advised of the possibility of such damages, or for any claim from any third party.
2. SPECIAL NOTICES
Throughout this User Manual, special notices relating to the safe and correct operation of the Piezoelectric Disc Pumps are formatted and highlighted as follows:
CAUTION
Instructions to ensure correct operation of the equipment and/or for avoiding
damage to the equipment.
WARNING Instructions relating to the safety of the operator and avoiding injury.
3. INTRODUCTION
3.1.Piezoelectric Disc Pump
The Lee Company’s piezoelectric disc pumps are a multi-award winning technology which makes use of advances in the field of non-linear acoustics to offer the following unique features:
- silent operation
- ultra-smooth flow
- millisecond responsiveness
- compact form factor
- high-precision controllability
In contrast to conventional air pumping mechanisms (such as diaphragm and piston pumps), the disc pumps do not rely on the bulk compression of air within a cavity. Instead, the disc pumps generate a high amplitude, high frequency acoustic standing wave within a specially designed acoustic cavity. The operating frequency varies part-to-part and with pump operating conditions (e.g. temperature, pressure, etc). A dedicated drive circuit is therefore required to identify and track this frequency over time.
Figure 1 shows a simplified schematic: the out-of-plane motion of the actuator
drives in-plane (radial) motion of the gas in the cavity and creates a
standing pressure wave, resulting in the oscillating cavity pressure shown.
The motion of the actuator is highly exaggerated: there is virtually no net
volume change of the cavity during operation, and at any given point in time
there exists both a region of compression and a region of rarefaction within
the cavity.
Rectification of the alternating cavity pressure is the key to delivering
useful pump performance and device lifetime. The Lee Company has addressed
this need by developing a family of innovative valve designs based on
lightweight polymer valve flaps.
The disc pump technology is protected by a portfolio of both patent
applications and granted patents.
4. SAFETY
WARNING
The equipment described in this document is intended for use by skilled and
competent personnel only. Further, the equipment is provided in a `bare’
format enabling users to integrate it into test fixtures, prototypes and
product assemblies.
The user should satisfy themselves that the equipment is, and remains fit for, the intended use. The user accepts that The Lee Company shall not be held responsible or liable for any injury, damage or loss to property, person or otherwise, resulting from use of the equipment.
In order to aid assessment of the safety of the equipment, the following indicative electrical data are provided:
For typical disc pump driver circuits
A.C. voltage on the PCB: 120 Vpp max. (at 20 22 kHz)
D.C. voltage on the PCB: 60 V max.
All disc pumps emit ultrasound in operation. The following data are provided for operation at maximum power (1.4W) at a distance of 30cm: Sound pressure level: 70-80 dB SPL @ 30 cm typ. (at 20-22 kHz)1
- Equivalent to <10 phon per ISO 226:2003 and related studies, 30 cm equivalent measurement distance
WARNING
Take care during use of disc pump driver circuits not to create short circuits
between exposed conductive parts of the PCBs. Short circuits may lead to
malfunctioning and heating.
5. PIEZOELECTRIC DISC PUMP OVERVIEW
6. INSTALLATION
6.1.Mechanical – Pump Mounting
All pump series can be mounted via the 2.2 mm diameter eyelets provided. The pump should be mounted using a pair of O-rings (one above and one below, as shown below) and a nylon bolt to isolate the high frequency vibration of the pump and avoid audible noise.
6.2.Pneumatic – Pump Manifolding
6.2.1. Inlet filtration requirements
TAKE NOTE All disc pumps should be operated with an inlet filter to prevent ingestion of debris that might otherwise shorten the operational life of the pump. The Lee Company recommends that a non-shedding filter with a pore size less than 3 microns is used.
6.2.2. BL/XP/LT Series pumps
For the BL, XP and LT pumps, which all have 4 pneumatic ports, it is important
to connect the ports correctly depending on the pump configuration (series or
parallel) to avoid poor performance and damage to the pump.
The configuration can be determined from the description of the product
purchased or from the pump label, as shown below:
BL/XP/LT Series pumps – series configuration pumps
For series configuration pumps:
- Ports 2 and 4 must be linked (see the pump Accessories for suggested coupler)
- Port 3 is inlet
- Port 1 is discharge
BL/XP/LT Series pumps parallel configuration pumps For parallel configuration pumps:
-
Ports 2 and 4 are the common inlet and should be linked*
-
Ports 1 and 3 are the common discharge and should be linked *
-
(see the pump Accessories for suggested coupler)
6.2.3. HP Series pumps
For HP Series pumps:
- Ports 2 is the inlet
- Ports 1 is the discharge
6.2.4. US Series pumps
For US Series pumps:
- Port 1 is the outlet
- The inlet is filtered and not connectable
6.3.Electrical – Pump “Flexi Tail” Connector
The disc pump uses an FFC (flat flex connector) compatible with most 8-way 0.5mm pitch FFC connectors. The General Purpose Disc Pump Drive PCB has such a connector, and it is important that the disc pump.
7. SYSTEM OPERATION
Once the disc pump has been installed correctly, it can be made to provide
pneumatic output (pressure and/or flow) by applying a suitable a.c. drive
signal to the pump electrical contacts. Details of this drive signal such as
the waveform, frequency and voltage, must be continuously optimised to provide
high pump efficiency.
Several suitable drive circuits are available from the Lee Company, and
technical resources allowing engineers to integrate these circuits into their
own products are available on request.
The maximum pneumatic output provided by a pump at a given drive power can be
visualised by a loadline, as shown in Figure 14 below. The maximum pressure
which can be generated (when there is no `flow’ requirement) is referred to as
the Stall Pressure. The maximum flow rate which can be generated (when there
is no pressure drop through the system) is referred to as the Free Flow. As
the pump can be driven anywhere from 0 100% of the specified output, all
flow and pressure combinations within the load-line envelope can be achieved.
8. ACCESSORIES
The following accessories are available for the Piezoelectric Disc Pump.
8.1.UACX0500500H (prototype C-coupler)
The C-coupler provides a convenient method for linking ports in the series configuration pumps in prototype systems, as described in Section 6.2.
Materials: Accura Extreme Polymer
Notes: Note that these prototype components are fabricated by SLA and are therefore not recommended for use in mass-produced products. The Lee Company make no guarantees concerning the performance of this component with respect but not limited to:
- Burst pressure
- Working pressure
- Materials/environmental compatibility
- UV exposure
8.2.UACX0500550H (prototype Y-coupler)
The Y-coupler provides a convenient method for linking ports in the parallel configuration pumps in prototype systems, as described in Section 6.2.
Materials: Accura Extreme Polymer
Notes: Note that these prototype components are fabricated by SLA and are
therefore not recommended for use in mass-produced products. The Lee Company
makes no guarantees concerning the performance of this component with respect
but not limited to:
- Burst pressure
- Working pressure
- Materials/environmental compatibility
- UV exposure
8.3. UACX0500750H (Filter)
It is recommended that the pump inlet is connected to a filter with a pore size of <3 m to prevent ingress of debris which may reduce the performance of the pump.
Materials: Polypropylene Housing, Glass Microfibre membrane Notes:
- 30 mm HPLC Syringe Filter
- Non-sterile
- Pore size of 1.2 m
9. SUPPORT
The support section of The Lee Company website
www.theleeco.com/discpumps provides
technical information, FAQs, troubleshooting and documentation for download,
including a range of application notes.
For additional technical support, please contact your Lee Sales Engineer.
10.CERTIFICATE OF CONFORMITY
11.REVISION HISTORY
THE LEE COMPANY · Tel: 860-399-6281 · www.theleeco.com
References
- The Lee Company | Miniature Precision Fluid Control
- The Lee Company | Miniature Precision Fluid Control
- Disc Pump Landing Page | The Lee Co