CN213336600U - Magnetic liquid pressure sensor with protection switch and alarm device - Google Patents
Magnetic liquid pressure sensor with protection switch and alarm device Download PDFInfo
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- CN213336600U CN213336600U CN202022334427.9U CN202022334427U CN213336600U CN 213336600 U CN213336600 U CN 213336600U CN 202022334427 U CN202022334427 U CN 202022334427U CN 213336600 U CN213336600 U CN 213336600U
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Abstract
The utility model discloses a magnetic liquid pressure sensor with a protection switch and an alarm device, which comprises a non-magnetic conductive pipe filled with magnetic liquid, wherein the non-magnetic conductive pipe comprises a first measuring part, a second measuring part and a connecting part; the top end of the first measuring part is provided with an air pressure inlet end, and the top end of the second measuring part is provided with an atmosphere communication end; a first induction coil is wound on the first measuring part, a second induction coil is wound on the second measuring part, and the first induction coil and the second induction coil are respectively and electrically connected with the measuring device; the atmospheric pressure inlet department is provided with the solenoid valve, winds on the lateral wall of the one end that connecting portion are close to first measuring department and is equipped with the detection coil, and the detection coil is connected with overload protection device's input electricity, and this overload protection device's output is connected with solenoid valve and alarm electricity respectively. The utility model provides a magnetic fluid pressure sensor do not have overload protection's problem.
Description
Technical Field
The utility model relates to a magnetic liquid pressure sensor technical field, in particular to magnetic liquid pressure sensor with protection switch and alarm device.
Background
The magnetic liquid pressure sensor is a new technology for applying magnetic liquid as a sensing medium to sensor development, has the advantages of high response speed, strong anti-interference capability, wide working range temperature, simple structure and the like, and has wide application prospects in the fields of aerospace, biomedicine and the like.
However, the existing magnetic liquid pressure sensor has the following defects:
(1) in the measurement process, no protection switch limits the input of gas pressure, and once the gas pressure is input into the inlet end of the sensor, the gas pressure can be continuously input all the time, if an emergency occurs, the pressure connection needs to be manually disconnected, so that great inconvenience is brought to measurement, meanwhile, certain reaction time is needed for manual operation, and the potential safety hazard in the emergency situation is further increased. (2) The device is free of an over-range detection and alarm device, and when the over-range detection and alarm device is used, one arm of a non-magnetic conduction pipe in the sensor is filled with magnetic liquid, even the magnetic liquid overflows, the instrument is damaged, and meanwhile, the peripheral devices are polluted.
SUMMERY OF THE UTILITY MODEL
The utility model provides a magnetic liquid pressure sensor with protection switch and alarm device to solve current magnetic liquid pressure sensor because do not have protection switch, do not have overload detection and alarm device, cause the technical problem of the potential safety hazard when current magnetic liquid pressure sensor has emergency from this.
In order to solve the technical problem, the utility model provides a following technical scheme:
a magnetic liquid pressure sensor with a protection switch and an alarm device comprises a non-magnetic conductive pipe, wherein magnetic liquid is filled in the non-magnetic conductive pipe; the non-magnetic pipe comprises a first measuring part, a second measuring part and a connecting part; the first measuring part and the second measuring part are both linear hollow tubular structures, the first measuring part and the second measuring part are arranged in parallel in the vertical direction and at equal height, and the bottom ends of the first measuring part and the second measuring part are communicated through the connecting part;
the top end of the first measuring part is provided with an air pressure inlet end for inputting the pressure of the gas to be measured, and the top end of the second measuring part is provided with an atmosphere communicating end communicated with the atmosphere; a first induction coil is wound on the outer wall of the first measuring part, a second induction coil is wound on the outer wall of the second measuring part, and the output ends of the first induction coil and the second induction coil are respectively and electrically connected with a measuring device;
the utility model discloses a pneumatic pressure measuring device, including atmospheric pressure inlet department, connecting portion are close to around being equipped with detection coil on the lateral wall of the one end of first measuring department, the output of detection coil is connected with overload protection device's input electricity, overload protection device's output with solenoid valve and alarm electricity are connected respectively.
Wherein, the top of first measuring part extends along the horizontal direction and forms horizontal installation department, horizontal installation department be with the hollow tubular structure of first measuring part intercommunication, the atmospheric pressure entry end is located horizontal installation department keeps away from the one end of first measuring part, the solenoid valve sets up on the horizontal installation department.
The connecting part is of a linear type hollow tubular structure, the connecting part is horizontally arranged, and the first measuring part and the second measuring part are perpendicular to the connecting part.
The detection coil is formed by winding a copper enameled wire.
The first induction coil is formed by winding a copper enameled wire.
The second induction coil is formed by winding a copper enameled wire.
Wherein the measuring device comprises a first resistance and a second resistance;
the first induction coil, the second induction coil, the first resistor and the second resistor form a bridge circuit; the first induction coil and the second induction coil are in differential connection, and form four bridge arms of the bridge circuit together with the first resistor and the second resistor; one end of the bridge circuit is electrically connected with the working power supply, and the other end of the bridge circuit is electrically connected with the signal conversion circuit.
Wherein the overload protection device comprises a trigger and a relay; the output end of the detection coil is electrically connected with the input end of the trigger, the output end of the trigger is electrically connected with the input end of the relay, and the output end of the relay is electrically connected with the alarm and the electromagnetic valve respectively.
The utility model provides a beneficial effect that technical scheme brought includes at least:
1. the utility model provides an utilize detection coil to detect the detection scheme of the excessive removal of the intraductal magnetic fluid post of magnetic conduction not, whether there is magnetic fluid through the left end inner chamber that detects the horizontal connection portion of magnetic conduction not, judge whether be full of magnetic fluid in the intraductal right arm of magnetic conduction not, this scheme is simple effective, conveniently reports to the police on next step and opens atmospheric pressure access protection switch.
2. The utility model provides an automatic alarm device to the overload condition of sensor can in time received signal and start through control system, and the loaded down with trivial details work load of having avoided artifical observation and manual control's mode can not in time react when the overload condition appears in the sensor, deals with proruption situation's problem.
3. The utility model discloses the structure to traditional U-shaped magnetic conduction pipe is not carried out the improvement, is being surveyed gas input end and has increased horizontal installation department to at this horizontal installation department installation solenoid valve, this solenoid valve can receive control system signal and in time close gas input channel, thereby plays the overload protection effect of sensor. The scheme is simple and convenient, the untimely manual switch is avoided, and the problem of overload protection of the sensor is effectively solved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a magnetic liquid pressure sensor with a protection switch and an alarm device according to an embodiment of the present invention;
fig. 2 is a schematic view of the working principle of the magnetic liquid pressure sensor with the protection switch and the alarm device according to the embodiment of the present invention;
fig. 3 is a schematic diagram of states of a sensor and a detection coil of a magnetic liquid pressure sensor with a protection switch and an alarm device according to an embodiment of the present invention in an alarm state;
fig. 4 is a schematic circuit diagram of a measurement apparatus according to an embodiment of the present invention.
Description of reference numerals:
1. a non-magnetic pipe; 21. a first induction coil; 22. a second induction coil; 3. a magnetic liquid;
4. a detection coil; 5. a trigger; 6. a relay; 7. an alarm; 8. a measuring device;
9. an electromagnetic valve; 10. an air pressure inlet end; 11. an atmosphere communication end; 12. a first resistor;
13. a second resistor.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.
Referring to fig. 1 to 4, the present embodiment provides a magnetic liquid pressure sensor with a protection switch and an alarm device, the magnetic liquid pressure sensor includes a non-magnetic pipe 1, and the non-magnetic pipe 1 is made of a non-magnetic material, such as organic glass; the magnetic liquid 3 is filled in the non-magnetic pipe 1; the magnetic liquid 3 consists of nano ferromagnetic particles, a surfactant and a base carrier liquid; it should be noted that the magnetic liquid with low viscosity and high saturation magnetization, such as water-based magnetic liquid, should be selected as much as possible.
The non-magnetic pipe 1 comprises a first measuring part, a second measuring part and a connecting part; the first measuring part and the second measuring part are both linear hollow tubular structures, the first measuring part and the second measuring part are arranged in parallel in the vertical direction and at equal height, and the bottom ends of the first measuring part and the second measuring part are communicated through the connecting part; the top end of the first measuring part is provided with an air pressure inlet end 10 for inputting the pressure (air pressure for short) of the gas to be measured, and the top end of the second measuring part is provided with an atmosphere communicating end 11 communicated with the atmosphere; a first induction coil 21 is wound on the outer wall of the first measuring part and used for inducing the height change of the magnetic liquid column in the first measuring part of the non-magnetic pipe 1; a second induction coil 22 is wound on the outer wall of the second measuring part and used for inducing the height change of the magnetic liquid column in the second measuring part of the non-magnetic pipe 1; the output ends of the first induction coil 21 and the second induction coil 22 are electrically connected to the measuring device 8, respectively. The first induction coil 21 and the second induction coil 22 are both formed by winding copper enameled wires.
The magnetic liquid 3 is used as a magnetic core, the height change of the magnetic liquid in the non-magnetic pipe 1 reflects the pressure of the gas to be measured, so that the change of the gas pressure is converted into the change of a sensing medium in the induction coil, and the measurement of the pressure of the gas to be measured is completed by measuring the induced current.
Further, a mounting hole is formed near the air pressure inlet end 10 of the non-magnetic conductive pipe 1, an electromagnetic valve 9 is mounted in the mounting hole (the mounting hole is not recognized as an open state), a detection coil 4 is wound on the outer side wall of one end, close to the first measuring part, of the connecting part, and the detection coil 4 is formed by winding a copper enameled wire;
the output end of the detection coil 4 is electrically connected with the input end of an overload protection device, and the output end of the overload protection device is electrically connected with the electromagnetic valve 9 and the alarm 7 respectively. The detection coil 4 is used for sensing whether a magnetic liquid column on the left side of the horizontal connecting part of the non-magnetic pipe 1 exists or not, and the induction current in the detection coil 4 is 0 when the sensor is in an initial working state; when the magnetic liquid column in the non-magnetic pipe 1 excessively moves due to the overload of the magnetic liquid pressure sensor, so that the second measuring part of the non-magnetic pipe 1 is filled with the magnetic liquid column, the inner cavity of the first measuring part of the non-magnetic pipe 1 is emptied, and even the inner cavity of the left end of the horizontal connecting part of the non-magnetic pipe is emptied, namely the magnetic liquid column gradually moves to the working state shown in fig. 3, the internal magnetic core (namely the magnetic liquid column) of the detection coil 4 suddenly disappears, so that the magnetic flux in the detection coil 4 suddenly changes, and induction current is generated;
the overload protection device can be used for measuring the existence of the induced current of the detection coil 4 so as to judge whether the liquid level of the magnetic liquid 3 reaches the top end of the second measurement part of the non-magnetic pipe 1, namely whether the liquid level exceeds the measurement range; when the pressure exceeds the measuring range, the overload protection device outputs a control signal to control the alarm 7 to send alarm information and control the electromagnetic valve 9 to close so as to cut off the air pressure input at the air pressure inlet end 10.
Specifically, in this embodiment, the top of first measuring part extends along the horizontal direction and forms horizontal installation portion, horizontal installation portion be with the hollow tubular structure of first measuring part intercommunication, atmospheric pressure entry end 10 is located horizontal installation portion keeps away from the one end of first measuring part, solenoid valve 9 sets up on the horizontal installation portion to the atmospheric pressure input of the atmospheric pressure entry end 10 of control non-magnetic pipe 1 with cut off.
In this embodiment, the connection portion is a linear hollow tubular structure, the connection portion is horizontally disposed, and the first measurement portion and the second measurement portion are both perpendicular to the connection portion, as shown in fig. 1.
Wherein, as shown in fig. 4, the measuring device comprises a first resistor 12 and a second resistor 13; the first induction coil 21, the second induction coil 22, the first resistor 12 and the second resistor 13 form a bridge circuit; the first induction coil 21 and the second induction coil 22 are differentially connected, and form four bridge arms of the bridge circuit together with the first resistor 12 and the second resistor 13; one end of the bridge circuit is electrically connected with the working power supply, and the other end of the bridge circuit is electrically connected with the signal conversion circuit; when the magnetic liquid 3 gradually moves from the first measuring part of the non-magnetic pipe 1 to the second measuring part of the non-magnetic pipe 1 under the action of the pressure of the gas to be measured, the height of the magnetic core (magnetic liquid column) in the first induction coil 21 is gradually reduced, the height of the magnetic core (magnetic liquid column) in the second induction coil 22 is gradually increased, and inductance parameters of the first induction coil 21 and the second induction coil 22 are changed, so that the bridge circuit outputs corresponding electric signals to change;
the signal conversion circuit can convert the variation of the electric signal output by the bridge circuit into a corresponding pressure measurement indicated value. Here, it should be noted that, since the magnetic fluid pressure sensor itself belongs to the prior art, a mature signal conversion circuit is available in the prior art, and the present embodiment does not improve the magnetic fluid pressure sensor, and only needs to use the existing signal conversion circuit, so that details are not described herein.
Wherein the overload protection device comprises a trigger 5 and a relay 6; the output end of the detection coil 4 is electrically connected with the input end of the trigger 5, the output end of the trigger 5 is electrically connected with the input end of the relay 6, and the output end of the relay 6 is electrically connected with the alarm 7 and the electromagnetic valve 9 respectively. The trigger 5 is used for collecting and measuring a current signal output by the detection coil 4, when the detection coil 4 generates an induction current, the trigger 5 is triggered and outputs a high level, so that the relay 6 is started, and the alarm 7 and the electromagnetic valve 9 are automatically controlled through the relay 6.
In a possible embodiment, the trigger 5 can be implemented by an existing integrated chip, for example, a monostable trigger chip 74HC123 or other integrated circuit (e.g. NE555) with similar functions, so that when the detection coil 4 generates an induced current pulse due to a sudden magnetic flux change, the trigger 5 can be triggered by the generated current pulse signal to output a steady high level signal to activate the relay 6.
Specifically, the working principle of the magnetic liquid pressure sensor with the protection switch and the alarm device of the present embodiment is shown in fig. 2, and now is specifically described as follows:
in an initial state, the electromagnetic valve 9 is opened, a gas to be measured enters the first measuring part of the non-magnetic pipe 1 from the air pressure inlet end 10 of the non-magnetic pipe 1 during measurement, the magnetic liquid 3 moves along the inner wall of the non-magnetic pipe 1 under the pressure of the gas to be measured and gradually transfers from the first measuring part of the non-magnetic pipe 1 to the second measuring part of the non-magnetic pipe 1, the height of the magnetic liquid 3 in the first measuring part of the non-magnetic pipe 1 is reduced, the height of the magnetic liquid 3 in the second measuring part of the non-magnetic pipe 1 is increased, at the moment, induced currents in the first induction coil 21 and the second induction coil 22 are changed, and the corresponding electric signal variation can be measured through the measuring device 8, so that the measurement of the pressure of the input gas is completed.
If the pressure of the detected gas is gradually increased, the magnetic liquid 3 continues to move into the second measuring part of the non-magnetic pipe 1, and the magnetic liquid in the first measuring part of the non-magnetic pipe 1 is transferred into the connecting part and the second measuring part, so that the first measuring part of the non-magnetic pipe 1 is filled with the detected gas and does not contain the magnetic liquid 3. In the process, the magnetic core at the position of the detection coil 4 is always in a full-filling state, the magnetic flux is unchanged, and no induced current exists. When the pressure of the measured gas continues to increase to the working state shown in fig. 3, the magnetic core is suddenly lost in the detection coil 4, and an induction current is suddenly generated in the detection coil 4, at this time, corresponding measures can be taken through the trigger 5 and the relay 6: and the alarm 7 is opened and the electromagnetic valve 9 is closed, so that the purposes of alarming and cutting off gas pressure input are achieved, and the purpose of overload protection is further achieved.
In summary, in the embodiment, the electromagnetic valve is installed near the air pressure inlet end, the detection coil is arranged at the left end of the connecting portion, the detection coil is used for detecting excessive movement of the magnetic liquid column, and whether the magnetic liquid exists in the inner cavity of the horizontal connecting portion at the left end of the non-magnetic pipe is detected, so that whether the current sensor is overloaded or not is judged by judging whether the second measuring portion of the non-magnetic pipe is filled with the magnetic liquid or not, and therefore the next step of alarming and the opening of the air pressure passage protection switch are facilitated; aiming at the overload condition of the sensor, the alarm can be timely received, the alarm is started through the relay, the air pressure input is cut off, and the problems that the workload of manual observation is complex and the response cannot be timely made are solved.
Moreover, it is noted that, in this document, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. The terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or terminal that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or terminal. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or terminal that comprises the element.
It should be noted that although the preferred embodiment of the present invention has been described, it will be apparent to those skilled in the art that once the basic inventive concepts of the present invention have been fully appreciated, many modifications and enhancements can be made without departing from the principles of the present invention, which should also be considered as within the scope of the present invention. It is therefore intended that the following claims be interpreted as including the embodiments of the invention and all such alterations and modifications as fall within the true scope of the embodiments of the invention.
Claims (8)
1. A magnetic liquid pressure sensor with a protection switch and an alarm device is characterized by comprising a non-magnetic conductive pipe, wherein the non-magnetic conductive pipe is filled with magnetic liquid; the non-magnetic pipe comprises a first measuring part, a second measuring part and a connecting part; the first measuring part and the second measuring part are both linear hollow tubular structures, the first measuring part and the second measuring part are arranged in parallel in the vertical direction and at equal height, and the bottom ends of the first measuring part and the second measuring part are communicated through the connecting part;
the top end of the first measuring part is provided with an air pressure inlet end for inputting the pressure of the gas to be measured, and the top end of the second measuring part is provided with an atmosphere communicating end communicated with the atmosphere; a first induction coil is wound on the outer wall of the first measuring part, a second induction coil is wound on the outer wall of the second measuring part, and the output ends of the first induction coil and the second induction coil are respectively and electrically connected with a measuring device;
the utility model discloses a pneumatic pressure measuring device, including atmospheric pressure inlet department, connecting portion are close to around being equipped with detection coil on the lateral wall of the one end of first measuring department, the output of detection coil is connected with overload protection device's input electricity, overload protection device's output with solenoid valve and alarm electricity are connected respectively.
2. The magnetic fluid pressure sensor with protection switch and alarm device as claimed in claim 1, wherein the top end of the first measurement portion extends along the horizontal direction to form a horizontal installation portion, the horizontal installation portion is a hollow tubular structure communicated with the first measurement portion, the air pressure inlet end is located at one end of the horizontal installation portion far away from the first measurement portion, and the electromagnetic valve is arranged on the horizontal installation portion.
3. The magnetic fluid pressure sensor with protection switch and alarm device of claim 1, wherein said connection portion is a linear hollow tubular structure, said connection portion is horizontally disposed, and said first measurement portion and said second measurement portion are both disposed perpendicular to said connection portion.
4. The magnetic fluid pressure sensor with protection switch and alarm device as claimed in claim 1, wherein said detection coil is made by winding copper enameled wire.
5. The magnetic fluid pressure sensor with protection switch and alarm device of claim 1, wherein said first induction coil is wound by copper enameled wire.
6. The magnetic fluid pressure sensor with protection switch and alarm device of claim 1, wherein said second induction coil is wound by copper enameled wire.
7. The magnetic fluid pressure sensor with protection switch and alarm device of claim 1, wherein said measuring means comprises a first resistance and a second resistance;
the first induction coil, the second induction coil, the first resistor and the second resistor form a bridge circuit; the first induction coil and the second induction coil are in differential connection, and form four bridge arms of the bridge circuit together with the first resistor and the second resistor; one end of the bridge circuit is electrically connected with the working power supply, and the other end of the bridge circuit is electrically connected with the signal conversion circuit.
8. The magnetic fluid pressure sensor with protection switch and alarm device of claim 1, wherein said overload protection device comprises a trigger and a relay; the output end of the detection coil is electrically connected with the input end of the trigger, the output end of the trigger is electrically connected with the input end of the relay, and the output end of the relay is electrically connected with the alarm and the electromagnetic valve respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022334427.9U CN213336600U (en) | 2020-10-19 | 2020-10-19 | Magnetic liquid pressure sensor with protection switch and alarm device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022334427.9U CN213336600U (en) | 2020-10-19 | 2020-10-19 | Magnetic liquid pressure sensor with protection switch and alarm device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213336600U true CN213336600U (en) | 2021-06-01 |
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ID=76073194
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022334427.9U Active CN213336600U (en) | 2020-10-19 | 2020-10-19 | Magnetic liquid pressure sensor with protection switch and alarm device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213336600U (en) |
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2020
- 2020-10-19 CN CN202022334427.9U patent/CN213336600U/en active Active
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