• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    Air flow sensor for ventilation installations, formed by a structural body (1) that determines inside a duct (2) air circulation between holes (3) of entry and holes (4) outlet, going arranged in said conduit (2) a thermistor (5) formed by an electrical device of variable resistance with temperature, which allows to measure the speed of air passage. (Machine-translation by Google Translate, not legally binding)
    公开号:ES2578061A1
    申请号:ES201530058
    申请日:2015-01-19
    公开日:2016-07-20
    发明作者:Màrius Gamissans Bou
    申请人:Soler and Palau Research SL；
    IPC主号:
    专利说明:

    AIR FLOW SENSOR FOR VENTILATION FACILITIES
    5 Technical sector
    The present invention is related to the field of ventilation of buildings, homes, commercial premises, etc., proposing an air flow sensor that allows to control the operation of the facilities of that function and establish a
    10 precise operation thereof.
    State of the art
    Ventilation facilities for buildings, homes or commercial premises, include
    15 air circulation ducts in the areas or rooms to be ventilated, between outlets for evacuating stale air from the interior and fresh air inlets from the outside, in whose air inlets air treatment systems are usually arranged for, for example , cooling, heating or filtering.
    20 In said ventilation installations, the air circulation is established by means of driving units, which include fans, which print an air circulation speed to obtain adequate ventilation performance, depending on the optimum value of the necessary air flow, of various factors, such as the number of rooms to be ventilated, their occupation and the health and comfort conditions to be established in the
    25 same.
    On the other hand, it is known, by the principle of Physics, that the flow of air flowing through a conduit is equal to the section of said conduit multiplied by the velocity of the air flowing through the conduit. So, given that in a ventilation installation, the
    The diameter of the air circulation duct is known and does not change, knowing the flow of air circulating through the installation is reduced, namely the speed of air circulation through the installation duct.
    In order to measure the speed of the air, the principle of hot body (thread) is known
    35 or another type), whereby heat dissipation (ie the stabilization temperature) constitutes a parameter that indicates the air velocity, so that the lower the temperature the greater the air velocity. The problem with this type of sensors is that they measure the air velocity only at one point of the cross section of the circulation duct, while, as is known, the distribution of the air velocity is not uniform at the different points of a same section of a circulation duct of
    5 air
    The adjustment of the air flow to its optimum value, also allows to maintain efficient conditions of comfort and healthiness of the ventilated rooms, avoiding to contribute an excess of air flow with an unnecessary energy cost overrun, or a poor flow with which
    10 adequate ventilation is not achieved.
    There are air flow sensors in this regard, which are applicable, for example, in double-flow air ventilation installations with heat recovery, in which, by mechanical means, an air extraction flow is established and, in the sense opposite, a flow of air flow into the enclosure to be ventilated, both air flows through a heat exchanger. In these installations, for reasons of energy efficiency, it is important that both air flows are identical, and to achieve this an air flow sensor is placed in the circuit of each of the air flows, so that each sensor sends a control signal that modulates fan speed
    20 of the corresponding air circuit, thus automatically achieving the equality of the two air flows.
    Another application of the aforementioned air flow sensors is in ventilation installations where a constant air flow is required, while the
    25 characteristics of the installation are changing over time, since, for example, the loss of load of the installation increases as the air filter is filled. In this case, the air flow sensor sends the information of the air flow that circulates through the installation, to the control of the fan motor that drives the air in the installation, increasing its speed to compensate for the pressure loss that
    30 increases as the filter becomes clogged, which keeps the air flow constant.
    Different types of air flow sensors applicable to these functions are known in the market, but the high precision ones have a price that makes them prohibitive for
    35 many applications, as in the domestic sphere, since the cost of the sensor can be almost equal to the cost of the rest of the complete ventilation equipment; While others

    cheaper sensors, such as hot wire, are of little precision.
    Object of the invention
    The present invention relates to an air flow sensor for installations ofventilation, with characteristics that allow, with a simple and economical design,accurately determine the speed of the ventilation air flow, for its control.
    This sensor object of the invention solves the problem of measuring the speed of the
    10 air in the duct of a ventilation system, with a single electric element of the thermistor type (PTC or NTC) that stabilizes its temperature at about 702C, so that, by measuring the intensity of the electric current flowing through said thermistor, knows the speed of the air that passes through the sensor; the sensor can be calibrated to establish a correspondence between the speed of the air passing through the sensor and the air speed
    15 circulating through the duct of the ventilation system.
    The sensor body has a distribution of air inlets of very small dimensions (about 2 mm in diameter) that are oriented in the direction of arrival of the air flow in the duct of the ventilation system, which in these holes 20 of the sensor acts the total pressure of the air flow that circulates through the duct of the installation; the body of the sensor being provided, with a similar opening of air distribution in a direction perpendicular to the flow of air flowing through the installation, which allows the thermistor to be cooled by a representative flow of several points of the section of the installation duct, obtaining a measurement of the
    25 average air velocity in the corresponding section of the duct.
    In this way, the air enters the sensor through the holes oriented in the direction of arrival of the air flow and, after traveling inside the sensor, passing through the thermistor, is evacuated through the holes oriented perpendicular to the flow of air, so that in said holes only the static pressure of the air flow is present; determining the difference between the total air flow pressure and the static pressure, an air flow inside the sensor, which in turn determines the degree of cooling of the thermistor, from which and by means of the corresponding calibration, establishes the correspondence between the intensity of the electric current flowing through the thermistor and the
    35 speed of the air flow flowing through the installation duct.
    For the accuracy of the sensor, it is important that the air inlet holes and the air outlet orifices are close to each other, so that, according to the invention, the air circulation path inside the sensor is provided in loop shape, the air outlet holes being arranged perpendicularly with respect to the air intake holes,
    5 spaced apart from each other only by a part of the width of the inner duct of the sensor and the thickness of a wall separating the branches that determine the loop shape of said duct.
    Since the temperature of the air flowing through the installation duct influences the
    10 thermistor cooling, to take into account the effect of such influence, is placed next to the sensor, but outside it, another thermistor (in general NTC), which measures the air temperature, relating the reading of this thermistor with that of the internal thermistor of the sensor, to compensate for the influence of the air temperature on the air flow reading.
    The sensor object of the invention therefore comprises a structural body that determines in its interior an air circulation duct, between inlet holes and outlet ports, the latter being oriented perpendicular to the first, being arranged in said inner conduit an electric device of variable resistance
    20 with the temperature (thermistor), for example of the PTC type, which is established related to an external system for controlling the operation of the supply or extraction of air in the application installation. Additionally, the structural body is provided with a conformation for fixing the sensor assembly at a suitable point of the application installation.
    25 With this, a part of the air that circulates through the installation of application ventilation, enters the structural body of the sensor, crossing the inner duct of the same, where it passes through the thermistor, which allows to know the speed of passage of the air on the inside of the sensor, so that, from said data and by means of the corresponding calibration,
    30 can know the speed of the air that circulates through the duct of the ventilation installation, continuously generating a signal that is sent to the control of the installation, so that it reacts as appropriate.
    For this, in the application use the recommended sensor is arranged in a structural part
    35 of the application ventilation installation, where it is immersed in the flow of air circulating through the installation, so that the inlet holes in the structural body

    of the sensor are facing the flow of circulating air.
    A very simple and easy to incorporate air flow sensor is thus obtained in the ventilation installations, with which an accurate measurement of the air flow that is achieved is achieved.
    5 allows to determine a control of the air supply to obtain conditionsOptimal application ventilation, with energy consumption expenditure perfectlyadjusted to the needs of ventilation; this sensor being of sufficient precision tomost applications, with a cost of the order of a quarter that the cost ofConventional sensors of the same function found in the market.
    Therefore, said air flow sensor for ventilation installations, object of the invention, is certainly advantageous, acquiring its own life and preferential character, with respect to conventional systems, for the control of air flow in the installations. of ventilation
    Description of the figures
    Figure 1 shows in perspective an example of practical embodiment of the air flow sensor object of the invention.
    Figure 2 shows a longitudinal section in perspective of said air flow sensor of the previous figure.
    Figure 3 shows a perspective cross section of the same previous air flow sensor.
    Detailed description of the invention
    The object of the invention relates to an air flow sensor for installations of
    30 ventilation, which is formed by a structural body (1), which determines in its interior an air circulation duct (2), defined between inlet holes (3) and outlet holes (4), being arranged in said conduit (2) a thermistor (5), formed by an electrical device of varying resistance with temperature, for example of the PTC type.
    35 According to a non-limiting embodiment, the structural body (1) is made of plastic material and has a hollow "T" shape, having inside a partition (6) that longitudinally divides the gap of the transverse branch (1.1) of the "T" in two halves and extending through the middle area along the perpendicular branch (t .2) of the 'T'.
    In said structural body (1) the inlet holes (3) of the inner duct (2) are
    5 found in one of the halves separated by the partition (6) in the transverse branch (1.1) Ythe outlet holes (4) in the other half of said transverse branch (1 .1), oriented ofperpendicular to the input holes (3), the thermistor (5) being arranged in the areaextreme inside the perpendicular branch (1.2), where the partition (6) gives way to theconduit (2) between one half and another of said interior of said perpendicular branch
    10 (1.2), where external connection cables (7) of the thermistor (5) go outside through holes (8) sealed with a tight seal.
    The structural body (t) can have at the end of the perpendicular branch (1.2), a removable cover (9), for the incorporation of the thermistor (5) inside; In addition, half of the transverse branch (1.1) opposite the perpendicular branch (1.2) can be formed by another removable cover (10), to facilitate the molded formation of said structural body (1) in plastic or other material capable of molding This embodiment, like the "T" shaped configuration of said structural body (1), is not limitative, and it can be any other that allows constructive formation of said body
    20 structural (1) by any conventional technique and mount the thermistor (5) inside it.
    In the configuration of the structural body (1), an external conformation (11) is also provided, in order to establish the clamping of the air flow sensor in the application installation, where it is foreseen that the air flow sensor is fixed to the structure of the application installation so that a part of the air flow that circulates through the installation enters the structural body (1) of the sensor through the inlet holes (3) and after circulating through the interior thereof, passing by the thermistor (5), be evacuated by the outlet holes (4), whereby the thermistor (5) generates a signal that allows to adjust the
    30 air supply for optimum ventilation conditions according to an established forecast.
    权利要求:
    Claims (4)
    [1]
    1.-Air flow sensor for ventilation installations, of application for the control of the air flow that is driven in the ventilation installations, characterized in that
    5 comprises a structural body (1), which determines in its interior a conduit (2) ofair circulation, defined between inlet holes (3) and outlet holes (4),a thermistor (5), formed by an electrical device being arranged in said conduit (2)of variable resistance with temperature.
    10 2.-Air flow sensor for ventilation installations, according to the first claim, characterized in that the structural body (1) has a hollow "T" shape, having inside a partition (6) that divides the hollow of the transverse branch
    (1.1) of the "T" in two longitudinal halves, in one of which are the inlet holes (3) of the air circulation duct (2) and in the other half the holes (4) of
    15, while in the hollow of the perpendicular branch (1.2) of the "T" said partition (6) extends longitudinally through the middle area, without reaching the end of the hole, leaving a passage between the halves of the hole, in where the thermistor (5) is arranged.
    [3]
    3.-Air flow sensor for ventilation installations, in accordance with the
    First and second claims, characterized in that the structural body (1) is open at the ends, where it is closed by means of separate covers (9) and (10).
    [4]
    4.-Air flow sensor for ventilation installations, according to the first claim, characterized in that the structural body (1) has a conformation
    (11) exterior, for fixing in the application assembly.
    [5]
    5.-Air flow sensor for ventilation installations, according to the first claim, characterized in that the thermistor (5) is a PTC type device.
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    同族专利:
    公开号 | 公开日
    ES2578061B1|2017-02-27|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US6411192B1|1998-12-28|2002-06-25|Lansense, Llc|Method and apparatus for sensing and measuring plural physical properties, including temperature|
    US20040231412A1|2003-05-20|2004-11-25|A.T.C.T. Advanced Thermal Chips Technologies Ltd.|Flow velocity measurement method and apparatus, including applications thereof for measuring heat flow, and wind velocity and/or direction|
    SE527122C2|2004-11-01|2005-12-27|Lindinvent Ab|Gas velocity measuring device, e.g. for use in air ducts, has exit port with sensor for measuring cooling effect of gas flow|
    US7347092B1|2006-09-28|2008-03-25|Delphi Technologies, Inc.|Apparatus and method for fluid flow measurement|GB2568041A|2017-10-30|2019-05-08|Zehnder Group Lenham Ltd|Air flow sensor|
    法律状态:
    2017-02-27| FG2A| Definitive protection|Ref document number: 2578061 Country of ref document: ES Kind code of ref document: B1 Effective date: 20170227 |
    优先权:
    申请号 | 申请日 | 专利标题
    ES201530058A|ES2578061B1|2015-01-19|2015-01-19|Air flow sensor for ventilation installations|ES201530058A| ES2578061B1|2015-01-19|2015-01-19|Air flow sensor for ventilation installations|
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