CN211929381U - Liquid level switch suitable for low-temperature pressure vessel - Google Patents
Liquid level switch suitable for low-temperature pressure vessel Download PDFInfo
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- CN211929381U CN211929381U CN202020146016.4U CN202020146016U CN211929381U CN 211929381 U CN211929381 U CN 211929381U CN 202020146016 U CN202020146016 U CN 202020146016U CN 211929381 U CN211929381 U CN 211929381U
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Abstract
The utility model provides a liquid level switch suitable for low temperature pressure vessel, it includes: a float ball sensor for monitoring a liquid level inside a pressure vessel is provided in the pressure vessel. A step capacitance signal is formed by the floating ball of the sensor along with the floating height of the liquid, the signal is captured by the liquid level switch transmitter to inform a user, and at the moment, the liquid in the pressure container is in a full liquid state, and the user cuts off the supply of a related liquid source. Only when the floating ball rises along with the liquid and touches the positive pole of the sensor, the related signal can be output, and at the moment, the liquid must be in a full liquid state, and no error output exists.
Description
Technical Field
The utility model relates to a liquid level switch technical field especially relates to a liquid level switch suitable for low temperature pressure vessel.
Background
The liquid level switches of the low-temperature pressure vessels on the market are various in types and different in principle, and some liquid level switches are conservative in design and measurement for safety, so that the utilization efficiency of the vessels is low when users use the low-temperature pressure vessels. Some devices use the principle of a low-temperature liquid level meter to give related switch signals according to the measured liquid level height, but the error is large, and accurate real-time measurement cannot be met.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that to prior art not enough, provide a liquid level switch suitable for low temperature pressure vessel.
The utility model provides an above-mentioned technical problem's technical scheme as follows: a level switch adapted for use with a cryogenic pressure vessel, comprising: a float ball sensor for monitoring a liquid level inside a pressure vessel is provided in the pressure vessel.
The utility model has the advantages that: the floating ball of the sensor forms a step capacitance signal along with the floating height of the liquid, the signal is captured by the liquid level switch transmitter and is informed to a user, and if the liquid in the pressure container is in a full liquid state at the moment, the user can cut off the supply of the related liquid source. And only when the floating ball rises along with the liquid and touches the positive pole of the sensor, the relevant signal can be output, and at the moment, the liquid is in a full liquid state inevitably, and no error output exists.
On the basis of the technical scheme, the utility model discloses can also do following improvement.
Further, the float ball sensor includes: the device comprises a positive electrode component and a negative electrode component, wherein the positive electrode component is arranged at the top of the pressure container, and the negative electrode component is arranged below the positive electrode component in a suspending manner along with the liquid level of the pressure container.
The beneficial effect of adopting the further scheme is that: when liquid in the pressure container is close to full level, namely the liquid level is close to the top of the pressure container, a plurality of negative parts float upwards along with the liquid level and touch a positive part arranged on the top of the pressure container, so that a very large capacitance is formed between the negative parts and the positive part, even if the negative parts and the positive part are not in good contact, the capacitance between the negative parts and the positive part is very large and is far larger than 100 times of the capacitance before the negative parts are not touched, when the negative parts contact the positive part, the capacitance value of the floating ball sensor is the maximum, under the condition that the voltage is not changed, the charge quantity on the polar plate is correspondingly the maximum, and under the condition that the liquid level switch transmitter is connected with the liquid level switch transmitter, the liquid level switch transmitter receives a step capacitance signal from the floating ball sensor, outputs a current signal of 20 milliamperes at the moment, and informs a user, and the liquid filling pump is closed in time or the system controls the automatic tripping and the disconnection of the liquid filling pump, so that the pressure container is prevented from being overcharged. When the liquid level in the pressure container drops, the negative electrode part drops along with the liquid level, and cannot be in contact with the positive electrode part, at the moment, the capacitance between the negative electrode part and the positive electrode part is rapidly reduced by hundreds of times until the capacitance cannot be measured, and at the moment, the sensor lead forms an open circuit. When negative pole part and anodal part separation, the capacitance value of floater sensor diminishes gradually, under the unchangeable circumstances of voltage, corresponding make the electrified volume on the polar plate reduce, under the circumstances with the switch-on of liquid level switch changer, the step capacitance signal that comes from the floater formula sensor of liquid level switch changer receipt, the current liquid level of 4 milliamperes of liquid level switch changer output this moment, it is lower to inform the user current liquid level, in time open the automatic opening and the closure of liquid pump or system control liquid pump that fills, the pressure vessel liquid level is not enough. The sensor lead sends the signal to the liquid level switch transmitter for processing.
Furthermore, the positive electrode component is a metal plate, and the negative electrode component is a plurality of metal floating balls.
The beneficial effect of adopting the further scheme is that: when liquid in the pressure container is close to full level, namely the liquid level is close to the top of the pressure container, a plurality of negative parts float upwards along with the liquid level and touch a positive part arranged on the top of the pressure container, so that a very large capacitance is formed between the negative parts and the positive part, even if the negative parts and the positive part are not in good contact, the capacitance between the negative parts and the positive part is very large and is far larger than 100 times of the capacitance before the negative parts are not touched, when the negative parts contact the positive part, the capacitance value of the floating ball sensor is the maximum, under the condition that the voltage is not changed, the charge quantity on the polar plate is correspondingly the maximum, and under the condition that the liquid level switch transmitter is connected with the liquid level switch transmitter, the liquid level switch transmitter receives a step capacitance signal from the floating ball sensor, outputs a current signal of 20 milliamperes at the moment, and informs a user, and the liquid filling pump is closed in time or the system controls the automatic tripping and the disconnection of the liquid filling pump, so that the pressure container is prevented from being overcharged. When the liquid level in the pressure container drops, the negative electrode part drops along with the liquid level, and cannot be in contact with the positive electrode part, at the moment, the capacitance between the negative electrode part and the positive electrode part is rapidly reduced by hundreds of times until the capacitance cannot be measured, and at the moment, the sensor lead forms an open circuit. When negative pole part and anodal part separation, the capacitance value of floater sensor diminishes gradually, under the unchangeable circumstances of voltage, corresponding make the electrified volume on the polar plate reduce, under the circumstances with the switch-on of liquid level switch changer, the step capacitance signal that comes from the floater formula sensor of liquid level switch changer receipt, the current liquid level of 4 milliamperes of liquid level switch changer output this moment, it is lower to inform the user current liquid level, in time open the automatic opening and the closure of liquid pump or system control liquid pump that fills, the pressure vessel liquid level is not enough. The sensor lead sends the signal to the liquid level switch transmitter for processing.
Further, still include: the sensor comprises a transmitter shell and a signal processing circuit arranged in the transmitter shell, wherein the floating ball type sensor is connected with the signal processing circuit.
The beneficial effect of adopting the further scheme is that: whether the floating ball of the sensor is in close contact with the positive pole of the sensor or not depends on the floating height of the floating ball of the sensor along with liquid, when the contact distance between the negative pole part and the positive pole part is less than 0.5 mm, a step capacitance signal can be formed, the step capacitance signal is captured by the liquid level switch transmitter, and therefore a 20mA signal is output to a user to inform the user, at the moment, the liquid in the pressure container is in a full liquid state, and the user cuts off the supply of related liquid sources. Otherwise, a 4mA signal is output, and the user knows that the liquid in the pressure container is in a non-full liquid state.
Further, the signal processing circuit includes: the device comprises a measuring and amplifying device, a signal processor and a liquid crystal display screen which are sequentially connected.
The beneficial effect of adopting the further scheme is that: depending on the floating height of the sensor floating ball along with the liquid, whether the floating ball is in close contact with the positive pole of the sensor or not can form a step capacitance signal when the contact distance is less than 0.5 mm, the signal is captured by the liquid level switch transmitter, so that a 20mA signal is output to a user to inform the user, and at the moment, the liquid in the pressure container is in a full liquid state, and the user cuts off the supply of a related liquid source. Otherwise, a 4mA signal is output, and the user knows that the liquid in the pressure container is in a non-full liquid state.
Further, still include: an output device connected with the signal processor.
Further, the output device is a 4-20 milliamp output circuit.
Further, the output device outputs 20 milliamperes, which indicates that the pressure container is in a full liquid state; the output device outputs 4 milliamps, indicating that the pressure vessel is not flooded.
Further, still include: and the power supply is connected with the signal processor through a power supply management circuit.
The beneficial effect of adopting the further scheme is that: the power supply is used for supplying power to the transmitter.
Further, the distance between the negative electrode component and the positive electrode component is less than 0.5 mm, which indicates that the pressure container is in a full liquid state; the distance between the negative electrode member and the positive electrode member is greater than 0.5 mm, indicating that the pressure vessel is not in a flooded condition.
Advantages of additional aspects of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
Fig. 1 is a schematic structural view of a liquid level switch suitable for a low-temperature pressure vessel according to an embodiment of the present invention.
The reference numbers illustrate: 1-a floating ball sensor; 2-a pressure vessel; 3-a positive electrode member; 4-a negative electrode member; 5-a sensor interface; 6-measuring and amplifying equipment; 7-a signal processor; 8-liquid crystal display screen; 9-an output device; 10-power management circuit.
Detailed Description
The principles and features of the present invention are described below in conjunction with the following drawings, the examples given are only intended to illustrate the present invention and are not intended to limit the scope of the present invention.
As shown in fig. 1, fig. 1 is a schematic structural diagram of a liquid level switch suitable for a low-temperature pressure vessel according to an embodiment of the present invention.
A level switch adapted for use with a cryogenic pressure vessel, comprising: a float ball sensor 1 for monitoring the liquid level inside a pressure vessel, said float ball sensor 1 being arranged in a pressure vessel 2.
The utility model has the advantages that: the floating ball of the sensor forms a step capacitance signal along with the floating height of the liquid, the signal is captured by the liquid level switch transmitter and is informed to a user, and if the liquid in the pressure container is in a full liquid state at the moment, the user can cut off the supply of the related liquid source. And only when the floating ball rises along with the liquid and touches the positive pole of the sensor, the relevant signal can be output, and at the moment, the liquid is in a full liquid state inevitably, and no error output exists.
The embodiment of the utility model provides a capacitanc liquid level switch who is different from above measurement principle, this kind of principle liquid level switch, the precision is high, and the response is fast, has begun small batch production at present. In order to overcome the not enough problem of precision of liquid level switch in the market, the utility model provides a capacitanc liquid level switch, this kind of liquid level switch has solved the inaccurate problem of measurement from the principle, through constantly optimizing performance and reliability, obtains market recognition.
The liquid level switch comprises a sensor and a transmitter, wherein the transmitter comprises a shell, a measuring circuit, a signal processing circuit, a signal output circuit and display equipment. The housing part has an electromagnetic shielding function in addition to the function of connecting and fixing the components.
The liquid level sensor comprises a metal floating ball, a sensor anode metal plate, which is generally called as a floating ball type sensor, and has the specific functions of see fig. 1, when liquid in a pressure container is close to full degree, a plurality of metal balls float upwards along with the liquid level and touch a sensor anode arranged at the top of the pressure container, so that a very large capacitor is formed between the floating ball and the sensor anode, even if the floating ball and the sensor anode are not in good contact, the capacitance between the floating ball and the sensor anode is also very large and is far larger than 100 times of the capacitance before the floating ball is not in contact, when the liquid level in the pressure container is reduced, the metal floating ball descends along with the floating ball and cannot be in contact with the sensor anode, at the moment, the capacitance between the floating ball and the sensor anode is rapidly reduced by hundreds of times until the measurement is. The sensor lead sends the signal to the liquid level switch transmitter for processing. And feeding back the signal processing result to a user, and displaying the relevant state through display equipment.
Depending on the floating height of the sensor floating ball along with the liquid, whether the floating ball is in close contact with the positive pole of the sensor or not can form a step capacitance signal when the contact distance is less than 0.5 mm, the signal is captured by the liquid level switch transmitter, so that a 20mA signal is output to a user to inform the user, and at the moment, the liquid in the pressure container is in a full liquid state, and the user cuts off the supply of a related liquid source. Otherwise, a 4mA signal is output, and the user knows that the liquid in the pressure container is in a non-full liquid state.
The device has the advantages that the problems of measurement precision and accuracy can be solved in principle, only the floating ball rises along with the liquid and touches the positive pole of the sensor, relevant signals can be output, and at the moment, the liquid is in a full liquid state, and error output cannot exist. At the moment, the liquid is about more than 95% of the capacity of the pressure container and less than 98% of the capacity of the pressure container, and the accuracy of the measurement result is high.
Further, the floating ball sensor 1 includes: the positive electrode component 3 is arranged on the top of the pressure container 2, and the negative electrode component 4 is arranged below the positive electrode component 3 along with the liquid level of the pressure container 2 in a floating manner.
The beneficial effect of adopting the further scheme is that: when liquid in the pressure container is close to full level, namely the liquid level is close to the top of the pressure container, a plurality of negative parts float upwards along with the liquid level and touch a positive part arranged on the top of the pressure container, so that a very large capacitance is formed between the negative parts and the positive part, even if the negative parts and the positive part are not in good contact, the capacitance between the negative parts and the positive part is very large and is far larger than 100 times of the capacitance before the negative parts are not touched, when the negative parts contact the positive part, the capacitance value of the floating ball sensor is the maximum, under the condition that the voltage is not changed, the charge quantity on the polar plate is correspondingly the maximum, and under the condition that the liquid level switch transmitter is connected with the liquid level switch transmitter, the liquid level switch transmitter receives a step capacitance signal from the floating ball sensor, outputs a current signal of 20 milliamperes at the moment, and informs a user, and the liquid filling pump is closed in time or the system controls the automatic tripping and the disconnection of the liquid filling pump, so that the pressure container is prevented from being overcharged. When the liquid level in the pressure container drops, the negative electrode part drops along with the liquid level, and cannot be in contact with the positive electrode part, at the moment, the capacitance between the negative electrode part and the positive electrode part is rapidly reduced by hundreds of times until the capacitance cannot be measured, and at the moment, the sensor lead forms an open circuit. When negative pole part and anodal part separation, the capacitance value of floater sensor diminishes gradually, under the unchangeable circumstances of voltage, corresponding make the electrified volume on the polar plate reduce, under the circumstances with the switch-on of liquid level switch changer, the step capacitance signal that comes from the floater formula sensor of liquid level switch changer receipt, the current liquid level of 4 milliamperes of liquid level switch changer output this moment, it is lower to inform the user current liquid level, in time open the automatic opening and the closure of liquid pump or system control liquid pump that fills, the pressure vessel liquid level is not enough. The sensor lead sends the signal to the liquid level switch transmitter for processing.
Further, the positive electrode member 3 is a metal plate, and the negative electrode member 4 is a plurality of metal floating balls.
The beneficial effect of adopting the further scheme is that: when liquid in the pressure container is close to full level, namely the liquid level is close to the top of the pressure container, a plurality of negative parts float upwards along with the liquid level and touch a positive part arranged on the top of the pressure container, so that a very large capacitance is formed between the negative parts and the positive part, even if the negative parts and the positive part are not in good contact, the capacitance between the negative parts and the positive part is very large and is far larger than 100 times of the capacitance before the negative parts are not touched, when the negative parts contact the positive part, the capacitance value of the floating ball sensor is the maximum, under the condition that the voltage is not changed, the charge quantity on the polar plate is correspondingly the maximum, and under the condition that the liquid level switch transmitter is connected with the liquid level switch transmitter, the liquid level switch transmitter receives a step capacitance signal from the floating ball sensor, outputs a current signal of 20 milliamperes at the moment, and informs a user, and the liquid filling pump is closed in time or the system controls the automatic tripping and the disconnection of the liquid filling pump, so that the pressure container is prevented from being overcharged. When the liquid level in the pressure container drops, the negative electrode part drops along with the liquid level, and cannot be in contact with the positive electrode part, at the moment, the capacitance between the negative electrode part and the positive electrode part is rapidly reduced by hundreds of times until the capacitance cannot be measured, and at the moment, the sensor lead forms an open circuit. When negative pole part and anodal part separation, the capacitance value of floater sensor diminishes gradually, under the unchangeable circumstances of voltage, corresponding make the electrified volume on the polar plate reduce, under the circumstances with the switch-on of liquid level switch changer, the step capacitance signal that comes from the floater formula sensor of liquid level switch changer receipt, the current liquid level of 4 milliamperes of liquid level switch changer output this moment, it is lower to inform the user current liquid level, in time open the automatic opening and the closure of liquid pump or system control liquid pump that fills, the pressure vessel liquid level is not enough. The sensor lead sends the signal to the liquid level switch transmitter for processing.
Further, still include: the sensor comprises a transmitter shell and a signal processing circuit arranged in the transmitter shell, wherein the floating ball type sensor is connected with the signal processing circuit.
The beneficial effect of adopting the further scheme is that: depending on the floating height of the sensor floating ball along with the liquid, whether the floating ball is in close contact with the positive pole of the sensor or not can form a step capacitance signal when the contact distance is less than 0.5 mm, the signal is captured by the liquid level switch transmitter, so that a 20mA signal is output to a user to inform the user, and at the moment, the liquid in the pressure container is in a full liquid state, and the user cuts off the supply of a related liquid source. Otherwise, a 4mA signal is output, and the user knows that the liquid in the pressure container is in a non-full liquid state.
Further, the signal processing circuit includes: the device comprises a measuring and amplifying device 6, a signal processor 7 and a liquid crystal display screen 8, wherein the measuring and amplifying device 6, the signal processor 7 and the liquid crystal display screen 8 are sequentially connected.
The beneficial effect of adopting the further scheme is that: depending on the floating height of the sensor floating ball along with the liquid, whether the floating ball is in close contact with the positive pole of the sensor or not can form a step capacitance signal when the contact distance is less than 0.5 mm, the signal is captured by the liquid level switch transmitter, so that a 20mA signal is output to a user to inform the user, and at the moment, the liquid in the pressure container is in a full liquid state, and the user cuts off the supply of a related liquid source. Otherwise, a 4mA signal is output, and the user knows that the liquid in the pressure container is in a non-full liquid state.
Further, still include: an output device 9, the output device 9 being connected with the signal processor 7.
Further, the output device is a 4-20 milliamp output circuit.
Further, the output device outputs 20 milliamperes, which indicates that the pressure container is in a full liquid state; the output device outputs 4 milliamps, indicating that the pressure vessel is not flooded.
Further, still include: and the power supply is connected with the signal processor 7 through a power management circuit 10.
The beneficial effect of adopting the further scheme is that: the power supply is used for supplying power to the transmitter.
Further, the distance between the negative electrode component and the positive electrode component is less than 0.5 mm, which indicates that the pressure container is in a full liquid state; the distance between the negative electrode member and the positive electrode member is greater than 0.5 mm, indicating that the pressure vessel is not in a flooded condition.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.
Claims (3)
1. A level switch adapted for use with a cryogenic pressure vessel, comprising: a ball float sensor for monitoring a liquid level inside the pressure vessel, the ball float sensor being disposed in the pressure vessel;
the float ball sensor includes: the positive electrode component is arranged at the top of the pressure container, and the negative electrode component is arranged below the positive electrode component in a suspending way along with the liquid level of the pressure container;
the positive electrode component is a metal plate, and the negative electrode component is a plurality of metal floating balls;
further comprising: the sensor comprises a transmitter shell and a signal processing circuit arranged in the transmitter shell, wherein the floating ball type sensor is connected with the signal processing circuit;
the signal processing circuit includes: the device comprises a measuring and amplifying device, a signal processor and a liquid crystal display screen, wherein the measuring and amplifying device, the signal processor and the liquid crystal display screen are sequentially connected;
further comprising: an output device connected with the signal processor;
the output device is a 4-20 milliampere output circuit;
the output equipment outputs 20 milliamperes, which indicates that the pressure container is in a full liquid state; the output device outputs 4 milliamps, indicating that the pressure vessel is not flooded.
2. The level switch for a cryogenic pressure vessel of claim 1, further comprising: and the power supply is connected with the signal processor through a power supply management circuit.
3. The liquid level switch suitable for the low-temperature pressure vessel as claimed in claim 1, wherein the distance between the negative electrode part and the positive electrode part is less than 0.5 mm, which indicates that the pressure vessel is in a full liquid state; the distance between the negative electrode member and the positive electrode member is greater than 0.5 mm, indicating that the pressure vessel is not in a flooded condition.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020146016.4U CN211929381U (en) | 2020-01-23 | 2020-01-23 | Liquid level switch suitable for low-temperature pressure vessel |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020146016.4U CN211929381U (en) | 2020-01-23 | 2020-01-23 | Liquid level switch suitable for low-temperature pressure vessel |
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| CN211929381U true CN211929381U (en) | 2020-11-13 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115625808A (en) * | 2022-10-21 | 2023-01-20 | 广东技标实业有限公司 | Intelligent automatic medicine feeding mechanism for cutting machine |
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2020
- 2020-01-23 CN CN202020146016.4U patent/CN211929381U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115625808A (en) * | 2022-10-21 | 2023-01-20 | 广东技标实业有限公司 | Intelligent automatic medicine feeding mechanism for cutting machine |
| CN115625808B (en) * | 2022-10-21 | 2023-08-08 | 广东技标实业有限公司 | Be used for automatic medicine mechanism that adds of cutting machine intelligence |
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