• 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:
    The invention relates to a device for monitoring the temperature and tightening of a screw which comprises: a temperature detector positioned near the screw head for measuring the temperature of the screw; a screw clamping detector; comprising a sensor member (20) comprising a first portion positioned on the head (10) of the screw to be rotationally integral with said screw and a second portion, fixed with respect to the first portion and arranged to generate a representative detection state a position of the first part relative to the second part and a first detection unit (21) connected to the sensor member (20) and arranged to determine a tightening level of the screw according to the state of detection of the sensor organ.
    公开号:FR3041719A1
    申请号:FR1559043
    申请日:2015-09-25
    公开日:2017-03-31
    发明作者:Josep Lopez；Alain Perrin
    申请人:Schneider Electric Industries SAS；
    IPC主号:
    专利说明:

    Technical field of the invention
    The present invention relates to a device for monitoring the temperature and the tightening of a screw. The screw is for example used in an electrical connection terminal or on a conductor bar of a busbar for clamping an electrical conductor.
    State of the art
    It is increasingly necessary to be able to quickly know the state of an electrical installation, such as for example that placed inside an electrical cabinet. The operator performing his inspection must be able to quickly retrieve a certain amount of information related to the state of the inspected installation. But today, some information is not necessarily readable easily and require some manipulation. This is the case for example information related to the screws used in the electrical installation, for example at the electrical terminals or the busbar of a busbar. This information is the temperature of the screw at its head and its level of tightening. Indeed, the follow-up of these parameters is essential if one wants to make sure of the good operation of the installation.
    The object of the invention is therefore to provide a device for monitoring the temperature and the tightening of a screw, such as a screw used in a terminal or on a busbar of a busbar.
    Presentation of the invention
    This object is achieved by a device for monitoring the temperature and the tightening of a screw, said screw comprising at least one head and a rod and being intended to clamp one or more electrical conductors, said device comprising: a temperature sensor positioned near the screw head for measuring the temperature of the screw, - a screw clamping sensor comprising a sensor member comprising a first portion positioned on the screw head to be integral in rotation with said screw screw and a second part, fixed with respect to the first part and arranged to generate a detection state representative of a position of the first part relative to the second part and a first detection unit connected to the sensor member and arranged to determine a tightening level of the screw according to the detection state of the sensor member.
    According to one feature, the sensor member comprises a permanent magnet mounted on a cap fixed to the screw head.
    According to another feature, the sensor member comprises a hall effect sensor arranged to measure the magnetic field generated by said permanent magnet.
    According to another feature, the sensor member comprises one or more microswitches with magnetic actuation.
    According to another particularity, the temperature detector comprises a thermistor type component connected to a second detection unit.
    According to another feature, the device comprises a signaling unit connected to an output of the first detection unit and to an output of the second detection unit and arranged to signal a tightening state of the screw supplied by the first detection unit. and / or a temperature state provided by the second detection unit.
    According to another feature, the device comprises a main housing in which are housed: the first detection unit and the second detection unit, said signaling unit.
    In another feature, the temperature sensor is attached to said main housing.
    According to another feature, the device comprises a power supply system arranged to supply electricity to the temperature detector, to the first detection unit, to the second detection unit and to the signaling unit.
    According to another feature, the power supply system comprises an inductive electric energy generator comprising at least one current transformer comprising a core intended to be arranged around said electrical conductor forming the primary of a transformer, and a winding realized around the core and forming the secondary of said transformer to recover electrical energy when an electric current flows in the electrical conductor.
    According to another feature, the core has a torus shape intended to surround the electrical conductor.
    According to another feature, the device comprises an electronic circuit connected to the secondary of the transformer, the electronic circuit comprising means for storing the generated electrical energy.
    BRIEF DESCRIPTION OF THE DRAWINGS Other features and advantages will appear in the following detailed description with reference to the accompanying drawings in which: FIG. 1 is a diagrammatic side view of the device of the invention installed on a FIG. 2 is a schematic front view of the device of the invention shown in FIG. 1; FIG. 3 illustrates in a diagram the architecture of the device of the invention, Figure 4 shows an improvement of the device shown in Figures 1 and 2, Figures 5A and 5B show two alternative embodiments employed in the device of the invention to determine the tightening level of a screw.
    DETAILED DESCRIPTION OF AT LEAST ONE EMBODIMENT The invention is intended to determine the temperature at a clamping screw and its clamping level when it is used in the electrical field, in particular for clamping an electrical conductor on a terminal of an electrical device or on a conducting bar of a busbar.
    In known manner, a screw used in the electrical field comprises a screw head 10 and a rod 11 provided with an external thread. A washer 12 is optionally positioned between the screw and the stirrup of a terminal or the conductive bar. A nut 14 may be provided at the end of the rod which is opposite to the head. In the remainder of the description and in the figures, we will consider that the screw is intended for clamping a conductor (not shown) on a conducting bar 13.
    The device of the invention thus comprises: - a clamping detector for determining the tightening level of the screw, - a temperature detector for measuring the temperature at the screw head.
    The clamping sensor comprises a sensor member 20 and a first detection unit 21 (FIG. 3). The sensor member 20 comprises a first part fixed on the screw head and rotatably connected thereto and a second part intended to determine the position of the first part in order to generate a detection state representative of a position of the first part compared to the second part. The first detection unit 21 has an input to which the sensor member 20 is connected in order to receive said detection state supplied by the sensor member 20.
    The first part of the sensor member 20 comprises, for example, a cap 200 (FIGS. 1 and 2), made of plastics material and arranged to fasten by clipping onto the head 10 of the screw, so as to be integral in rotation with said screw when it is screwed or unscrewed. Depending on the size of the screw head, the size of the cap is adapted to attach to it.
    With reference to FIGS. 5A and 5B, the sensor member 20 can take two distinct architectures: in FIG. 5A, the first part of the sensor member 20 comprises a permanent magnet 201 fixed on the cap 200 and the second part comprises a hall effect sensor 202 for measuring the magnetic field emitted by the permanent magnet 201. The hall effect sensor 202 generates a signal to the first detection unit 21 which depends on the position of the permanent magnet 201. According to the received signal of the hall effect sensor 202, the first detection unit 21 determines the tightening level of the screw. - In Figure 5B, the first part also comprises a permanent magnet 201 fixed on the cap 200 and the second part comprises a plurality of detection members distributed over the entire periphery of the screw head and each capable of generating a corresponding on-off signal in their closed state or in their open state. The detection members are fixed relative to the screw. They are, for example, microswitches 203 with magnetic actuation, such as "reed" type switches. Each microswitch 203 is connected to the first detection unit 21. According to the closed or open state of each microswitch 203, the first detection unit 21 determines the position of the permanent magnet 201 and deduces therefrom the level of tightening the screw.
    Advantageously, the first detection unit 21 determines the level of tightening of the screw by comparison between the signal received from the sensor member 20 corresponding to an angular position of the screw with a signal initially measured corresponding to the angular position of the screw when it is perfectly tight or a memorized signal corresponding to a determined clamping value. If the difference between the two signals exceeds a determined value, the first detection unit 21 activates an alert.
    The temperature detector comprises for its part a sensor member 30 (FIGS. 1 and 2), such as, for example, a thermistor type component with a positive thermal coefficient (PTC) or a negative thermal coefficient (NTC or "positive temperature coefficient"). Negative Temperature Coefficient ") and a second detection unit 31 comprising at least one input intended to receive the temperature values measured by the sensor member 30 and at least one output. This second detection unit 31 is for example arranged to determine if a temperature value exceeds a determined threshold stored. The sensor member 30 of the temperature detector is for example positioned at the lowest possible distance from the screw head, in order to obtain the most accurate measurements possible.
    The first detection unit 21 and the second detection unit 31 may be made in the form of a microcontroller or each be made using discrete electronic components. Depending on the architecture, the data will be analog or digital in nature.
    Advantageously, the device comprises a signaling unit 40 connected to the output of the first detection unit 21 and the output of the second detection unit 31. This signaling unit 40 is intended to alert the operator of the state of the screw, be it its temperature and its level of tightening. This signaling unit 40 comprises for example several light indicators 400.
    Advantageously, the device comprises a power supply system intended to supply electrical energy to the first detection unit 21, the second detection unit 31 and the signaling unit 40.
    Advantageously, with reference to FIG. 3, the electrical power supply system comprises an electric energy generator arranged to generate electrical energy, autonomously. This system generates electrical energy by induction. It comprises at least one current transformer comprising a core intended to be arranged around the conducting bar which forms the primary of a transformer, and a winding formed around the core and forming the secondary of said transformer for recovering electrical energy when a electric current flows in said busbar. The core has, for example, a form of torus 50 that can open to surround the bar 13. The system also includes an electronic circuit 51 which is connected to the torus for the purpose of recovering the electrical energy generated and which distributes it to the different units. of the device.
    Preferably, the device comprises a main housing 60 in which are placed the first detection unit 21, the second detection unit 31, the signaling unit 40 and the power supply system. This housing has a central opening so as to let the conductive bar through the core of the power supply system. The sensor member 30 of the temperature detector is fixed on the main housing 60 so as to be able to sense the temperature. It is then positioned near the screw.
    The device also includes a first secondary housing 61 through which an opening 610 is formed to pass the screw head. This secondary housing 61 carries the second portion of the sensor member 20 of the screw clamping detector. As mentioned above, the first part of this sensor member is fixed on the cap 200 positioned on the screw head and at the opening made in the secondary housing 61.
    With reference to FIG. 4, the device may also comprise a second secondary housing 62 of the same type as the first, connected to the main housing. This second housing is intended to be positioned around the nut 14 screwed to the end of the screw, to capture the tightening information and temperature at the nut. This variant is adapted when the screw is arranged to pass through two conductive bars 13, the nut 14 bearing against the second bar. A cap similar to cap 200 described above will be used to position itself on said nut 14.
    Each secondary housing may be mounted on a hinge mechanism made on the main housing, in order to pivot relative thereto.
    According to the invention, the two detection units can be arranged to communicate with each other in order to correlate the information related to the temperature and the clamping level.
    In further development, the device may comprise a data transmitter arranged to transmit the temperature and / or clamp level data to a remote receiver so as to collect the information. The transmission of the data may be carried out by any known wireless communication solution, such as for example "Bluetooth". This information can be sent to a server. A terminal, such as for example a smartphone or tablet, may include an application for connecting to said server to view this information.
    The device of the invention thus has many advantages, among which:
    It allows to quickly know the clamping and temperature state of each clamping screw, without the use of an external measuring device,
    It is autonomous in electrical energy and therefore does not require any special maintenance,
    It installs easily and quickly,
    It is particularly compact.
    权利要求:
    Claims (12)
    [1" id="c-fr-0001]
    1. Device for monitoring the temperature and the tightening of a screw, said screw comprising at least one head (10) and a rod (11) and being intended to clamp one or more electrical conductors, said device being characterized in that it comprises: a temperature sensor positioned near the screw head for measuring the temperature of the screw; - a screw clamping sensor comprising a sensor member (20) comprising a first portion positioned on the head (10) of the screw to be integral in rotation with said screw and a second part fixed with respect to the first part and arranged to generate a detection state representative of a position of the first part with respect to the second part and a first detection unit (21) connected to the sensor member (20) and arranged to determine a tightening level of the screw depending on the detection state of the sensing organ. r.
    [2" id="c-fr-0002]
    2. Device according to claim 1, characterized in that the sensor member (20) comprises a permanent magnet (201) mounted on a cap (200) fixed on the head (10) of screws.
    [3" id="c-fr-0003]
    3. Device according to claim 2, characterized in that the sensor member (20) comprises a hall effect sensor arranged to measure the magnetic field generated by said permanent magnet (201).
    [4" id="c-fr-0004]
    4. Device according to claim 2, characterized in that the sensor member (20) comprises one or more microswitches with magnetic actuation.
    [5" id="c-fr-0005]
    5. Device according to claim 1, characterized in that the temperature detector comprises a thermistor type component connected to a second detection unit (31).
    [6" id="c-fr-0006]
    6. Device according to claim 5, characterized in that it comprises a signaling unit (40) connected to an output of the first detection unit (21) and an output of the second detection unit (31) and arranged to indicate a tightening state of the screw supplied by the first detection unit and / or a temperature state supplied by the second detection unit.
    [7" id="c-fr-0007]
    7. Device according to claim 6, characterized in that it comprises a main housing in which are housed: - the first detection unit (21) and the second detection unit (31), - said signaling unit (40) .
    [8" id="c-fr-0008]
    8. Device according to claim 7, characterized in that the temperature detector is fixed on said main housing.
    [9" id="c-fr-0009]
    9. Device according to claim 6, characterized in that it comprises a power supply system arranged to supply electricity to the temperature detector, to the first detection unit (21), to the second detection unit ( 31) and to the signaling unit (40).
    [10" id="c-fr-0010]
    10. Device according to claim 9, characterized in that the power supply system comprises an induction electric energy generator comprising at least one current transformer having a core to be arranged around said electrical conductor forming the primary of a transformer, and a coil formed around the core and forming the secondary of said transformer for recovering electrical energy when an electric current flows in the electrical conductor.
    [11" id="c-fr-0011]
    11. Device according to claim 10, characterized in that the core has a torus shape (50) for surrounding the electrical conductor (13).
    [12" id="c-fr-0012]
    12. Device according to claim 10 or 11, characterized in that it comprises an electronic circuit (51) connected to the secondary of the transformer, the electronic circuit comprising means for storing the generated electrical energy.
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    US10365122B2|2019-07-30|
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    法律状态:
    2016-07-01| PLFP| Fee payment|Year of fee payment: 2 |
    2017-03-31| PLSC| Publication of the preliminary search report|Effective date: 20170331 |
    2017-09-15| PLFP| Fee payment|Year of fee payment: 3 |
    2018-09-24| PLFP| Fee payment|Year of fee payment: 4 |
    2019-09-16| PLFP| Fee payment|Year of fee payment: 5 |
    2020-09-28| PLFP| Fee payment|Year of fee payment: 6 |
    2021-09-27| PLFP| Fee payment|Year of fee payment: 7 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1559043A|FR3041719B1|2015-09-25|2015-09-25|DEVICE FOR MONITORING THE TEMPERATURE AND TIGHTENING OF A SCREW|FR1559043A| FR3041719B1|2015-09-25|2015-09-25|DEVICE FOR MONITORING THE TEMPERATURE AND TIGHTENING OF A SCREW|
    EP16188249.3A| EP3147081B1|2015-09-25|2016-09-12|Device for monitoring temperature and tightening of a screw|
    US15/267,477| US10365122B2|2015-09-25|2016-09-16|Device for monitoring temperature and tightening of a screw|
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