WO2012135457A1 - Turbidity sensor with integral guide formations for emitter and receiver alignment - Google Patents
Turbidity sensor with integral guide formations for emitter and receiver alignment Download PDFInfo
- Publication number
- WO2012135457A1 WO2012135457A1 PCT/US2012/031149 US2012031149W WO2012135457A1 WO 2012135457 A1 WO2012135457 A1 WO 2012135457A1 US 2012031149 W US2012031149 W US 2012031149W WO 2012135457 A1 WO2012135457 A1 WO 2012135457A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- circuit board
- printed circuit
- receiver
- transmitter
- hollow
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/47—Scattering, i.e. diffuse reflection
- G01N21/49—Scattering, i.e. diffuse reflection within a body or fluid
- G01N21/53—Scattering, i.e. diffuse reflection within a body or fluid within a flowing fluid, e.g. smoke
- G01N21/534—Scattering, i.e. diffuse reflection within a body or fluid within a flowing fluid, e.g. smoke by measuring transmission alone, i.e. determining opacity
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
- A47L15/00—Washing or rinsing machines for crockery or tableware
- A47L15/42—Details
- A47L15/4297—Arrangements for detecting or measuring the condition of the washing water, e.g. turbidity
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
- D06F34/00—Details of control systems for washing machines, washer-dryers or laundry dryers
- D06F34/14—Arrangements for detecting or measuring specific parameters
- D06F34/22—Condition of the washing liquid, e.g. turbidity
Definitions
- the present invention relates to a turbidity sensor for washing machines or dishwashers, adapted to detect the level of turbidity of a liquid during a wash cycle.
- Optical sensors adapted to detect the turbidity of a liquid in a washing machine or dishwasher are well known. These sensors typically comprise an optical transmitter which transmits light radiation through the washing liquid and an optical receiver which receives the optical radiation transmitted by the transmitter after the passage of the radiation through the washing liquid. By comparing the measurement of the optical radiation transmitted by the transmitter with the measurement of the optical radiation received by the receiver, the level of turbidity of the washing liquid can be determined.
- turbidity sensors depends on a number of factors, including the dispersion of the optical radiation transmitted by the transmitter.
- dispersion there is a known way of using transmitters which generate a beam having a small cross section in the direction of propagation.
- use is made, for example, of laser transmitters.
- transmitters of this type are costly.
- transmitters generating a beam with a small cross section must be aligned very precisely with the receiver .
- US-A-2007/0188763 describes a turbidity sensor comprising a diaphragm system placed between the transmitter and the receiver, enabling the precise alignment of the transmitter and receiver to be avoided.
- a turbidity sensor comprising a diaphragm system placed between the transmitter and the receiver, enabling the precise alignment of the transmitter and receiver to be avoided.
- the object of the present invention is to provide a simple and economical turbidity sensor, enabling a precise alignment to be established between the transmitter and receiver while using a smaller number of components than in the known solutions.
- this object is achieved with a turbidity sensor having the characteristics described in claim 1.
- FIG. 1 is an exploded perspective view of a turbidity sensor according to the present invention
- FIG. 1 is an exploded view in elevation in the direction of the arrow II in Figure 1
- FIG. 3 is an exploded cross section taken along the line III-III of Figure 2
- - Figure 4 is an axial section through the sensor of Figure 1
- FIG. 5 is a cross section taken along the line V-V of Figure 4.
- the number 10 indicates a turbidity sensor for washing machines or dishwashers.
- the sensor 10 comprises a hollow casing 12 of plastic material, having a longitudinal axis A.
- the casing 12 has a cylindrical lateral wall 14 having a circular aperture 16 at one of its ends.
- the hollow casing 12 has a bottom wall 18 and two hollow arms 20 extending beyond the bottom wall 18 in a direction parallel to the longitudinal axis A.
- the hollow arms 20 are made in one piece with the lateral wall 14, and have respective outer walls 21 and inner walls 22.
- the inner walls 22 face each other and are parallel to the longitudinal axis A.
- the sensor 10 comprises a printed circuit board 24 which carries an optical transmitter 26 and an optical receiver 28.
- the printed circuit board 24 also carries the components 30 of an electronic control circuit associated with the transmitter 26 and the receiver 28.
- the printed circuit board 24 also carries an electrical connector 32 for the electrical connection of the sensor 10 to an external circuit .
- the printed circuit board 24 has two opposing longitudinal edges 34 which are parallel to each other and are placed parallel to the longitudinal axis A.
- the printed circuit board 24 has two branches 36 spaced apart from each other in such a way that one end of the board 24 is substantially U-shaped.
- the transmitter 26 and the receiver 28 are fixed to the ends of the respective arms 36.
- the transmitter 26 can be, for example, an LED, while the receiver 28 can be, for example, a phototransistor, a photodiode or a solar cell.
- the hollow casing 12 is permeable to the optical radiation generated by the transmitter 26, at least on the inner walls 22. Preferably, the whole casing 12 is made from a single transparent plastic material.
- the transmitter 26 and the receiver 28 are fixed to the printed circuit board 24 by means of respective metal terminals 38 which are inserted and fixed into respective holes in the printed circuit board 24.
- the transmitter 26 and the receiver 28 are spaced at a certain distance from the surface of the front of the printed circuit board 24.
- the transmitter 26 and the receiver 28 are connected to, and project from, the front surface of the printed circuit board 24, by means of respective portions of the metal terminals 38.
- the metal terminals 38 have a degree of flexibility such that the transmitter 26 and the receiver 28 can be displaced to a small extent relative to the printed circuit board 24 by the elastic deformation of the portions of the terminals 38 which extend between the body of the transmitter 26 or of the receiver 28 and the front surface of the printed circuit board 24.
- the printed circuit board 24 is inserted into the hollow casing 12 by a movement in a direction parallel to the longitudinal axis A, as indicated by the arrow B in Figures 1, 2 and 3.
- the hollow arms 20 of the casing 12 have, on the inner surfaces of their walls 21, 22, respective guide formations 40, 42 which receive and guide the transmitter 26 and the receiver 28 in the course of the insertion of the printed circuit board 24 into the hollow casing 12 in the longitudinal direction A.
- Each of these guide formations is, for example, formed by two parallel ribs 40, 42 which extend parallel to the longitudinal axis A.
- the ribs 40, 42 are formed, respectively, on the inner surfaces of the walls 21, 22 of the arms 20.
- the ribs 40, 42 are located on opposite sides of a plane which lies parallel to the longitudinal axis A and which passes through the terminals 38 of the transmitter 26 and the receiver 28.
- the ribs 40, 42 are preferably spaced apart from each other in a direction perpendicular to the printed circuit board 24.
- the ribs 40, 42 come into contact with opposite sides of the transmitter 26 and the receiver 28, and form guides for the orientation of the transmitter 26 and the receiver 28 in such a way that the respective transmitting and receiving surfaces are correctly aligned with each other.
- the alignment of the transmitter 26 with the receiver 28 is made possible by the elastic yielding properties of the portions of the terminals 38 which connect the transmitter 26 and the receiver 28 to the printed circuit board 24. The alignment takes place automatically as a result of the insertion of the printed circuit board 24 into the hollow casing 12.
- the hollow casing 12 is provided with a further guide which receives the printed circuit board 24.
- This further guide is preferably formed by opposing grooves 44 which receive the opposing longitudinal edges 34 of the printed circuit board 24.
- the senor 10 is provided with a cover 46 which is fixed to the hollow casing 12 after the insertion of the printed circuit board 24.
- the cover 46 is preferably snap-fitted to the casing 12 by means of apertures 48 which engage with teeth 50 formed on the outer surface of the cylindrical wall 14 of the hollow casing 12.
- the cover 46 is also provided with a front aperture 52 facing the connector 32 of the printed circuit board 24.
- the solution according to the present invention enables the transmitter 26 and the receiver 28 to be aligned with each other by means of integral guides 40, 42 formed in the hollow casing 12.
- the alignment between the transmitter 26 and the receiver 28 is established in the course of the insertion of the printed circuit board 24 into the casing 12, without the need to perform any preliminary operation for aligning the transmitter 26 with the receiver 28.
- the present invention does not reguire diaphragms or other additional components for the optical alignment of the radiation transmitted by the transmitter 26.
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Control Of Washing Machine And Dryer (AREA)
- Washing And Drying Of Tableware (AREA)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
Turbidity sensor for washing machines or dishwashers, comprising: - a hollow casing (12) having two hollow arms (20) parallel to a longitudinal axis (A), and - a printed circuit board (24) with two branches (36) spaced apart from each other which carry, respectively, an optical transmitter (26) and an optical receiver (28) connected to the printed circuit board (24) by means of respective terminals (38), in which the printed circuit board (24) can be inserted into said casing (12) by a movement along said longitudinal axis (A) in the course of which said branches (36) of the printed circuit board (24) are inserted into said hollow arms (20) of the hollow casing (12), and in which said hollow casing (12) is provided with integral guide formations (40, 42) formed on the inner surfaces of said hollow arms (20), in which said guide formations (40, 42) receive and orient the receiver and transmitter (26, 28) in the course of the insertion of the printed circuit board (24) into the hollow casing (12) in said longitudinal direction (A).
Description
TURBIDITY SENSOR WITH INTEGRAL GUIDE FORMATIONS FOR EMITTER AND RECEIVER ALIGNMENT
•k ~k ~k ~k
DESCRIPTION
Technical field
The present invention relates to a turbidity sensor for washing machines or dishwashers, adapted to detect the level of turbidity of a liquid during a wash cycle.
Background of the invention
Optical sensors adapted to detect the turbidity of a liquid in a washing machine or dishwasher are well known. These sensors typically comprise an optical transmitter which transmits light radiation through the washing liquid and an optical receiver which receives the optical radiation transmitted by the transmitter after the passage of the radiation through the washing liquid. By comparing the measurement of the optical radiation transmitted by the transmitter with the measurement of the optical radiation received by the receiver, the level of turbidity of the washing liquid can be determined.
The precision of turbidity sensors depends on a number of factors, including the dispersion of the optical radiation transmitted by the transmitter. In order to reduce the effects of dispersion, there is a known way of using transmitters which generate a beam having a small cross section in the direction of propagation. For this purpose, use is made, for example, of laser transmitters. However, transmitters of this type are costly. Furthermore, transmitters generating a beam with a small cross section must be aligned very precisely with the receiver .
US-A-2007/0188763 describes a turbidity sensor comprising a diaphragm system placed between the
transmitter and the receiver, enabling the precise alignment of the transmitter and receiver to be avoided. By using the diaphragm it is possible to establish a purely approximate alignment between the transmitter and the receiver, the actual alignment being produced by the diaphragm which generates a measuring beam aligned between the transmitter and the receiver.
The drawback of the solution described in US-A- 2007/0188763 is the need to provide the sensor with an additional component (the diaphragm) in order to align the measuring beam between the transmitter and the receiver.
Object and summary of the invention
The object of the present invention is to provide a simple and economical turbidity sensor, enabling a precise alignment to be established between the transmitter and receiver while using a smaller number of components than in the known solutions.
According to the present invention, this object is achieved with a turbidity sensor having the characteristics described in claim 1.
The claims form an integral part of the teachings provided in relation to the invention.
Brief description of the drawings
The present invention will now be described in detail with reference to the attached drawings, provided purely by way of non-limiting example, wherein:
- Figure 1 is an exploded perspective view of a turbidity sensor according to the present invention,
- Figure 2 is an exploded view in elevation in the direction of the arrow II in Figure 1,
- Figure 3 is an exploded cross section taken along the line III-III of Figure 2,
- Figure 4 is an axial section through the sensor of Figure 1, and
- Figure 5 is a cross section taken along the line V-V of Figure 4.
Detailed description of embodiments of the invention
With reference to the drawings, the number 10 indicates a turbidity sensor for washing machines or dishwashers. The sensor 10 comprises a hollow casing 12 of plastic material, having a longitudinal axis A. The casing 12 has a cylindrical lateral wall 14 having a circular aperture 16 at one of its ends. The hollow casing 12 has a bottom wall 18 and two hollow arms 20 extending beyond the bottom wall 18 in a direction parallel to the longitudinal axis A. The hollow arms 20 are made in one piece with the lateral wall 14, and have respective outer walls 21 and inner walls 22. The inner walls 22 face each other and are parallel to the longitudinal axis A.
The sensor 10 comprises a printed circuit board 24 which carries an optical transmitter 26 and an optical receiver 28. The printed circuit board 24 also carries the components 30 of an electronic control circuit associated with the transmitter 26 and the receiver 28. The printed circuit board 24 also carries an electrical connector 32 for the electrical connection of the sensor 10 to an external circuit .
The printed circuit board 24 has two opposing longitudinal edges 34 which are parallel to each other and are placed parallel to the longitudinal axis A. The printed circuit board 24 has two branches 36 spaced apart from each other in such a way that one end of the board 24 is substantially U-shaped. The transmitter 26 and the receiver 28 are fixed to the ends of the respective arms 36. The
transmitter 26 can be, for example, an LED, while the receiver 28 can be, for example, a phototransistor, a photodiode or a solar cell. The hollow casing 12 is permeable to the optical radiation generated by the transmitter 26, at least on the inner walls 22. Preferably, the whole casing 12 is made from a single transparent plastic material. With particular reference to Figure 2, the transmitter 26 and the receiver 28 are fixed to the printed circuit board 24 by means of respective metal terminals 38 which are inserted and fixed into respective holes in the printed circuit board 24.
As shown in Figures 1 and 2, the transmitter 26 and the receiver 28 are spaced at a certain distance from the surface of the front of the printed circuit board 24.
The transmitter 26 and the receiver 28 are connected to, and project from, the front surface of the printed circuit board 24, by means of respective portions of the metal terminals 38. The metal terminals 38 have a degree of flexibility such that the transmitter 26 and the receiver 28 can be displaced to a small extent relative to the printed circuit board 24 by the elastic deformation of the portions of the terminals 38 which extend between the body of the transmitter 26 or of the receiver 28 and the front surface of the printed circuit board 24.
The printed circuit board 24 is inserted into the hollow casing 12 by a movement in a direction parallel to the longitudinal axis A, as indicated by the arrow B in Figures 1, 2 and 3.
With particular reference to Figure 5, the hollow arms 20 of the casing 12 have, on the inner surfaces of their walls 21, 22, respective guide formations 40, 42 which receive and guide the transmitter 26 and the receiver 28 in
the course of the insertion of the printed circuit board 24 into the hollow casing 12 in the longitudinal direction A. Each of these guide formations is, for example, formed by two parallel ribs 40, 42 which extend parallel to the longitudinal axis A. The ribs 40, 42 are formed, respectively, on the inner surfaces of the walls 21, 22 of the arms 20. The ribs 40, 42 are located on opposite sides of a plane which lies parallel to the longitudinal axis A and which passes through the terminals 38 of the transmitter 26 and the receiver 28. The ribs 40, 42 are preferably spaced apart from each other in a direction perpendicular to the printed circuit board 24. The ribs 40, 42 come into contact with opposite sides of the transmitter 26 and the receiver 28, and form guides for the orientation of the transmitter 26 and the receiver 28 in such a way that the respective transmitting and receiving surfaces are correctly aligned with each other. The alignment of the transmitter 26 with the receiver 28 is made possible by the elastic yielding properties of the portions of the terminals 38 which connect the transmitter 26 and the receiver 28 to the printed circuit board 24. The alignment takes place automatically as a result of the insertion of the printed circuit board 24 into the hollow casing 12.
Preferably, the hollow casing 12 is provided with a further guide which receives the printed circuit board 24. This further guide is preferably formed by opposing grooves 44 which receive the opposing longitudinal edges 34 of the printed circuit board 24.
With reference to Figures 1-3, the sensor 10 is provided with a cover 46 which is fixed to the hollow casing 12 after the insertion of the printed circuit board 24. The cover 46 is preferably snap-fitted to the casing 12
by means of apertures 48 which engage with teeth 50 formed on the outer surface of the cylindrical wall 14 of the hollow casing 12. The cover 46 is also provided with a front aperture 52 facing the connector 32 of the printed circuit board 24.
The solution according to the present invention enables the transmitter 26 and the receiver 28 to be aligned with each other by means of integral guides 40, 42 formed in the hollow casing 12. The alignment between the transmitter 26 and the receiver 28 is established in the course of the insertion of the printed circuit board 24 into the casing 12, without the need to perform any preliminary operation for aligning the transmitter 26 with the receiver 28.
The present invention does not reguire diaphragms or other additional components for the optical alignment of the radiation transmitted by the transmitter 26.
Clearly, provided that the principle of the invention is retained, the details of construction and the forms of embodiment can be varied widely from what has been described and illustrated, without departure from the scope of the invention as defined by the following claims.
Claims
1. A turbidity sensor for washing machines or dishwashers, comprising:
- a hollow casing (12) having two hollow arms (20) parallel to a longitudinal axis (A) , and
- a printed circuit board (24) with two branches (36) spaced apart from each other which carry, respectively, an optical transmitter (26) and an optical receiver (28) connected to the printed circuit board (24) by means of respective terminals (38),
in which the printed circuit board (24) can be inserted into said casing (12) by a movement along said longitudinal axis (A) in the course of which said branches (36) of the printed circuit board (24) are inserted into said hollow arms (20) of the hollow casing (12),
characterized in that said hollow casing (12) is provided with integral guide formations (40, 42) formed on the inner surfaces of said hollow arms (20), in which said guide formations (40, 42) receive and orient the receiver and transmitter (26, 28) in the course of the insertion of the printed circuit board (24) into the hollow casing (12) in said longitudinal direction (A) .
2. The turbidity sensor as claimed in claim 1, characterized in that each of said guide formations comprises two longitudinal ribs (40, 42) located on opposite sides of a plane which lies parallel to said longitudinal axis (A) and which passes through said terminals (38) of the transmitter and receiver (26, 28).
3. The turbidity sensor as claimed in claim 2, characterized in that said ribs (40, 42) are spaced apart from each other in a direction perpendicular to said printed circuit board (24).
4 . The turbidity sensor as claimed in claim 1, characterized in that the transmitter (26) and the receiver (28) are spaced apart from the printed circuit board (24) and are connected to, and project from, the printed circuit board (24) by means of respective portions of said terminals ( 38 ) .
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| ITTO2011A000286 | 2011-03-30 | ||
| IT000286A ITTO20110286A1 (en) | 2011-03-30 | 2011-03-30 | TURBIDITY SENSOR FOR WASHING MACHINES OR DISHWASHER |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2012135457A1 true WO2012135457A1 (en) | 2012-10-04 |
Family
ID=43977518
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/US2012/031149 WO2012135457A1 (en) | 2011-03-30 | 2012-03-29 | Turbidity sensor with integral guide formations for emitter and receiver alignment |
Country Status (2)
| Country | Link |
|---|---|
| IT (1) | ITTO20110286A1 (en) |
| WO (1) | WO2012135457A1 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104122234A (en) * | 2014-06-30 | 2014-10-29 | 河海大学常州校区 | Turbidity detection system and turbidity detection device for washing machine |
| CN104372576A (en) * | 2014-11-21 | 2015-02-25 | 吴江市首腾电子有限公司 | Washing machine water turbidity induction device |
| US20170234848A1 (en) * | 2016-02-16 | 2017-08-17 | Solteam Opto, Inc. | Water quality sensor suitable for automated production |
| CN111855652A (en) * | 2019-04-25 | 2020-10-30 | 泰科电子(上海)有限公司 | Turbidity sensor module and turbidity sensor |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5828458A (en) * | 1995-01-26 | 1998-10-27 | Nartron Corporation | Turbidity sensor |
| EP1111119A2 (en) * | 1999-12-07 | 2001-06-27 | Kabushiki Kaisha Toshiba | Drum type washing machine with turbidity sensor |
| US20070188763A1 (en) | 2003-12-15 | 2007-08-16 | Johann Schenkl | Turbidity sensor |
| WO2007115557A1 (en) * | 2006-04-08 | 2007-10-18 | Marquardt Gmbh | Sensor for measuring turbidity and temperature |
| WO2010112632A1 (en) * | 2009-03-31 | 2010-10-07 | Zertan, S.A. | Combined sensor for measuring variables in a liquid medium |
-
2011
- 2011-03-30 IT IT000286A patent/ITTO20110286A1/en unknown
-
2012
- 2012-03-29 WO PCT/US2012/031149 patent/WO2012135457A1/en active Application Filing
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5828458A (en) * | 1995-01-26 | 1998-10-27 | Nartron Corporation | Turbidity sensor |
| EP1111119A2 (en) * | 1999-12-07 | 2001-06-27 | Kabushiki Kaisha Toshiba | Drum type washing machine with turbidity sensor |
| US20070188763A1 (en) | 2003-12-15 | 2007-08-16 | Johann Schenkl | Turbidity sensor |
| WO2007115557A1 (en) * | 2006-04-08 | 2007-10-18 | Marquardt Gmbh | Sensor for measuring turbidity and temperature |
| WO2010112632A1 (en) * | 2009-03-31 | 2010-10-07 | Zertan, S.A. | Combined sensor for measuring variables in a liquid medium |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104122234A (en) * | 2014-06-30 | 2014-10-29 | 河海大学常州校区 | Turbidity detection system and turbidity detection device for washing machine |
| CN104372576A (en) * | 2014-11-21 | 2015-02-25 | 吴江市首腾电子有限公司 | Washing machine water turbidity induction device |
| US20170234848A1 (en) * | 2016-02-16 | 2017-08-17 | Solteam Opto, Inc. | Water quality sensor suitable for automated production |
| US10254267B2 (en) * | 2016-02-16 | 2019-04-09 | Solteam Opto, Inc. | Water quality sensor suitable for automated production |
| CN111855652A (en) * | 2019-04-25 | 2020-10-30 | 泰科电子(上海)有限公司 | Turbidity sensor module and turbidity sensor |
Also Published As
| Publication number | Publication date |
|---|---|
| ITTO20110286A1 (en) | 2012-10-01 |
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