CN216668905U - Detection apparatus for oil cup liquid level and lampblack absorber - Google Patents
Detection apparatus for oil cup liquid level and lampblack absorber Download PDFInfo
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- CN216668905U CN216668905U CN202220055458.7U CN202220055458U CN216668905U CN 216668905 U CN216668905 U CN 216668905U CN 202220055458 U CN202220055458 U CN 202220055458U CN 216668905 U CN216668905 U CN 216668905U
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Abstract
The utility model provides a detection device for the liquid level of an oil cup and a range hood, wherein the detection device for the liquid level of the oil cup comprises a first polar plate, a second polar plate, a control unit, a power supply and a reference capacitor; the first polar plate and the second polar plate are arranged in the oil cup, and the first polar plate and the second polar plate form a first capacitor; the capacitance value of the first capacitor is increased along with the rise of the liquid level in the oil cup; the control unit is used for controlling the power supply to charge the first capacitor based on the first control signal, controlling the first capacitor to charge the reference capacitor based on the second control signal, and determining the height of the liquid level in the oil cup according to the first charging time of the first capacitor to the reference capacitor to the preset reference voltage.
Description
Technical Field
The utility model relates to the technical field of kitchen electricity, in particular to a detection device for the liquid level of an oil cup and a range hood.
Background
The oil stain that lampblack absorber produced in the use can discharge into the oil cup, usually, the liquid level of fluid in the oil cup needs manual observation to detect, need in time pour the oil stain off in order to prevent to spill over after accumulating certain liquid level height, however along with the acceleration of life rhythm, people often can forget to clear up the oil cup, this just causes the fluid in the oil cup to ooze easily, cause secondary pollution to the environment in the kitchen, increase the washing degree of kitchen greasy dirt, consequently, only make accurate the detection to the liquid level of fluid in the oil cup, just can ensure that the user can do timely dismantlement cleaning work to the oil cup, in order to guarantee smoke ventilator's oil pumping cigarette effect.
The existing liquid level detection method generally adopts an infrared geminate transistor mode for detection, namely when the liquid level in an oil cup reaches the position of an infrared receiving and transmitting tube, shielding is caused, signals of the infrared receiving and transmitting tube change, a control circuit converts the received signal change into a prompt signal to inform a user that the oil cup is required to be cleaned in time, and oil-proof protection is required to be performed by using the infrared geminate transistor, so that the oil-proof geminate transistor has complex structural design and installation, and is very easy to be polluted by oil stains to influence the detection accuracy; the detection is carried out by adopting an ultrasonic probe, namely, the ultrasonic probe is utilized to emit ultrasonic waves into the oil cup, echo signals reflected by the liquid level of the waste oil in the oil cup are received, then, the time difference of the two signals is calculated to obtain a corresponding distance difference value, and finally, the distance difference value is subtracted from the height of the oil cup, namely, the liquid level height of the oil amount in the oil cup is obtained through detection.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome the defect that a liquid level detection device in the prior art is easy to interfere to cause inaccurate detection, and provides an oil cup liquid level detection device and a range hood.
The utility model solves the technical problems through the following technical scheme:
the utility model relates to a detection device for the liquid level of an oil cup, which comprises a first polar plate, a second polar plate, a control unit, a power supply and a reference capacitor, wherein the first polar plate is connected with the second polar plate;
the first polar plate and the second polar plate are arranged in the oil cup, and the first polar plate and the second polar plate form a first capacitor; wherein the capacitance value of the first capacitor increases with the increase of the liquid level in the oil cup;
the control unit is used for controlling the power supply to charge the first capacitor based on a first control signal, controlling the first capacitor to charge the reference capacitor based on a second control signal, and determining the height of the liquid level in the oil cup according to first charging time of the first capacitor to charge the reference capacitor to a preset reference voltage;
wherein the second control signal is an inverted signal of the first control signal.
Preferably, the detection device further comprises a switching unit and a comparing unit;
the first pole plate is connected with one end of the power supply or the reference capacitor through the switching unit, one end of the reference capacitor is connected with a first input end of the comparison unit, an output end of the comparison unit is connected with the control unit, a second input end of the comparison unit is connected with a reference power supply, the voltage of the reference power supply is a preset reference voltage, the control unit is further connected with the switching unit, and the second pole plate and the other end of the reference capacitor are grounded;
the control unit is further configured to send the first control signal to the switching unit, so that the first electrode plate is connected to the power supply; and sending the second control signal to the switching unit to connect the first plate with the reference capacitor.
Preferably, the detection device further comprises a third polar plate;
the third polar plate is arranged in the oil cup, the second polar plate and the third polar plate form a second capacitor, and the first polar plate, the second polar plate and the third polar plate are sequentially arranged along the length direction of the oil cup; wherein the capacitance value of the second capacitor increases with the increase of the liquid level in the oil cup;
the control unit is further used for controlling the reference capacitor to discharge based on a third control signal when the voltage at the two ends of the reference capacitor reaches the preset reference voltage;
when the reference capacitor finishes discharging, controlling the power supply to charge the second capacitor based on a fourth control signal, controlling the second capacitor to charge the reference capacitor based on a fifth control signal, and determining the height of the liquid level in the oil cup according to second charging time of the second capacitor to charge the reference capacitor to a preset reference voltage;
wherein the fifth control signal is an inverted signal of the fourth control signal.
Preferably, a distance between the first polar plate and the second polar plate is smaller than a distance between the third polar plate and the second polar plate.
Preferably, the switching unit includes a first switch, a second switch, a third switch, a fourth switch and an inverter;
one end of the phase inverter is connected with the control unit and the control end of the second switch respectively, and the other end of the phase inverter is connected with the control end of the first switch;
one end of the first switch is connected with the power supply, and the other end of the first switch is respectively connected with one end of the second switch, one end of the third switch and one end of the fourth switch;
the other end of the second switch is connected with a first input end of the comparison unit;
the control end of the third switch is connected with the control unit, and the other end of the third switch is connected with the first polar plate;
and the control end of the fourth switch is connected with the control unit, and the other end of the fourth switch is connected with the third polar plate.
Preferably, the detection device further comprises a discharge unit;
the discharge unit comprises a fifth switch and a resistor;
one end of the reference capacitor is connected with one end of the resistor through the fifth switch, the control end of the fifth switch is connected with the control unit, and the other end of the resistor is grounded;
the control unit is further configured to send the third control signal to the control terminal of the fifth switch;
the fifth switch connects the reference capacitance to the resistance based on the third control signal.
Preferably, if the first charging time reaches a preset charging time and/or the second charging time reaches a preset charging time, the control unit determines that the liquid level of the oil cup is full.
Preferably, the control unit is further configured to output a cup full prompt signal when the oil cup liquid level is full.
The utility model also provides a range hood which comprises an oil cup and the detection device for the liquid level of the oil cup.
The positive progress effects of the utility model are as follows: the detection device for the liquid level of the oil cup comprises a first polar plate, a second polar plate, a control unit, a power supply and a reference capacitor; the first polar plate and the second polar plate are arranged in the oil cup, and the first polar plate and the second polar plate form a first capacitor; the capacitance value of the first capacitor is increased along with the rise of the liquid level in the oil cup; the control unit is used for controlling the power supply to charge the first capacitor based on the first control signal, controlling the first capacitor to charge the reference capacitor based on the second control signal, and determining the height of the liquid level in the oil cup according to the first charging time of the first capacitor to charge the reference capacitor to a preset reference voltage. The technical problem of inaccurate detection caused by the fact that a liquid level detection device is easily interfered in the prior art is solved, the liquid level height of an oil cup can be automatically and accurately detected, and a user is timely reminded when the liquid level height reaches a set condition.
Drawings
Fig. 1 is a schematic circuit configuration diagram of a device for detecting a liquid level of an oil cup according to embodiment 1 of the present invention.
Fig. 2 is a schematic circuit structure diagram of the oil cup liquid level detection device according to embodiment 2 of the present invention.
Fig. 3 is a schematic diagram illustrating the installation of a pole plate of the oil cup liquid level detection device according to embodiment 2 of the present invention.
Fig. 4 is another schematic circuit configuration diagram of the oil cup liquid level detection device according to embodiment 2 of the present invention.
Detailed Description
The utility model is further illustrated by the following examples, which are not intended to limit the scope of the utility model.
Example 1
The present embodiment provides a device for detecting a liquid level in an oil cup, as shown in fig. 1, the device 1 of the present embodiment includes a first polar plate 101, a second polar plate 102, a control unit 2, a power source 3, and a reference capacitor 4.
In this embodiment, the first polar plate 101 and the second polar plate 102 are disposed in the oil cup, and the first polar plate 101 and the second polar plate 102 form a first capacitor; the capacitance value of the first capacitor increases with the rise of the liquid level in the oil cup, and the capacitance change can be proved by a capacitance calculation formula of the parallel plate capacitor, specifically, the capacitance calculation formula of the parallel plate capacitor is as follows:
in the above formula, C is the capacitance of the capacitor, ε is the dielectric constant of the medium between the plates, εrIs the relative dielectric constant of the medium between the plates, epsilon0Is a vacuum dielectric constant of ∈0＝8.85×10-12F/m, S is the effective relative area between the polar plates, and d is the relative distance between the polar plates; therefore, the change in capacitance of the capacitor is related to the change in three parameters of the dielectric constant ε, the relative area S, and the plate spacing d due to the vacuum dielectric constant ε0Is a constant, so that the capacitance C is directly related to the relative dielectric constant ε while maintaining S, d constantrProportional relationship, therefore, the dielectric material (namely the liquid with the required detection liquid level height) between the polar plates can be changed, and the dielectric material can be differentAfter the capacitance is changed due to different relative dielectric constants, and after the capacitance is adjusted by corresponding parameters, those skilled in the art should understand that the detection device of the embodiment can be used not only for detecting the liquid level of oil, but also for detecting the liquid levels of other liquids.
In this embodiment, the control unit 2 is configured to control the power supply 3 to charge the first capacitor based on a first control signal, control the first capacitor to charge the reference capacitor 4 based on a second control signal, and determine the height of the liquid level in the oil cup according to a first charging time when the first capacitor charges the reference capacitor 4 to a preset reference voltage Vref, where the second control signal is an inverse signal of the first control signal.
In a specific example, the first control signal is a high level signal, the second control signal is a low level signal, the control unit 2 continuously controls the power supply 3 to charge the first capacitor based on the high level signal, when the first capacitor reaches a certain voltage (which may be 3.3V), the control unit 2 sends out the low level signal, and the control unit 2 controls the first capacitor to charge the reference capacitor 4 based on the low level signal.
In another specific example, the first control signal and the second control signal are periodic signals, such as pulse signals, sent by the control unit 2, and therefore, the first control signal and the second control signal can be flexibly set according to application situations in the field.
In an alternative embodiment, as shown in fig. 1, the detection device 1 further comprises a switching unit 5 and a comparing unit 6.
Specifically, the first electrode plate 101 is connected to one end of the power supply 3 or the reference capacitor 4 through the switching unit 5, one end of the reference capacitor 4 is connected to a first input end of the comparing unit 6, an output end of the comparing unit 6 is connected to the control unit 2, a second input end of the comparing unit 6 is connected to a reference power supply, a voltage of the reference power supply is a preset reference voltage Vref, the control unit 2 is further connected to the switching unit 5, and the second electrode plate 102 and the other end of the reference capacitor 4 are grounded.
In this embodiment, the control unit 2 is further configured to send a first control signal to the switching unit 5 to connect the first plate 101 with the power source 3, and send a second control signal to the switching unit 5 to connect the first plate 101 with the reference capacitor 4.
In a specific implementation process, when the liquid level height in the oil cup starts to be detected, the control unit 2 starts to time, and sends a first control signal and a second control signal at a fixed frequency, the control unit 2 controls the power supply 3 to charge the first capacitor based on the first control signal, the control unit 2 controls the first capacitor to charge the reference capacitor 4 based on the second control signal, the charging processes are alternately switched all the time to realize that the charge on the first capacitor is transferred to the reference capacitor 4, after a certain time, when the voltage on the reference capacitor 4 reaches a preset reference voltage Vref, the comparison unit 6 outputs a rising edge signal or a falling edge signal to the control unit 2, and at the moment, the control unit 2 stops timing after receiving the turnover signal, so that the first charging time t of the whole process is obtained2Therefore, the detection device of the present embodiment can be based on the first charging time t2The height of the liquid level in the oil cup is determined.
In another specific implementation process, the control unit 2 records the charging time t for charging the reference capacitor 4 to the preset reference voltage Vref by the first capacitor when the oil cup is empty1Taking the voltage as a comparison reference, storing and memorizing the voltage when the control unit 2 is powered off, and simultaneously recording the charging time variation delta c of the first capacitor in advance by the control unit1And the amount of change of the charging time Δ c1Can be correspondingly set according to any height of the liquid level in the oil cup, namely one liquid level corresponds to one charging time variation delta c1For example, when the amount of oil in the oil cup is full, the charging time is changed by Δ c110 seconds, when the oil amount of the oil cup reaches half of the oil cup, the charging time variation delta c1The time of charge of the liquid pair to be detected is changed by an amount Δ c according to the capacitance of the first capacitor and 5 seconds1Setting is carried out; taking the oil amount of the oil cup as a full cup for example, the control unit 2 always monitors the charging time of the reference capacitor 4, the charging time of the reference capacitor 4 gradually increases as the oil amount in the oil cup increases, and when t is satisfied2-t1＝Δc1During the time, the control unit 2 then gives the suggestion that the oil cup oil mass is full, and the suggestion user oil cup needs the clearance to the detection device of the oil cup liquid level of this embodiment can detect the liquid level height of oil cup automatically, accurately, and in time remind the user to wash when the liquid level height reaches the settlement condition, has avoided liquid to amass the condition emergence of spilling over the polluted kitchen environment.
Example 2
The present embodiment provides a detection apparatus for a liquid level in an oil cup, as shown in fig. 2, the detection apparatus of the present embodiment is a further improvement of the embodiment, specifically, the detection apparatus 1 further includes a third polar plate 103, the third polar plate 103 is disposed in the oil cup, the second polar plate 102 and the third polar plate 103 form a second capacitor, and a capacity value of the second capacitor increases with an increase of the liquid level in the oil cup; the first polar plate 101, the second polar plate 102 and the third polar plate 103 are sequentially arranged along the length direction of the oil cup, and in order to reduce errors and ensure accurate liquid level detection, the three polar plates are required to be arranged at the same horizontal height.
In a preferred embodiment, as shown in fig. 3, the distance between the first plate 101 and the second plate 102 is smaller than the distance between the third plate 103 and the second plate 102, so that the capacitance value of the first capacitor formed by the first plate 101 and the second plate 102 is larger than the capacitance value of the second capacitor formed by the third plate 103 and the second plate 102 according to the above capacitance-parallel plate calculation formula, and thus the liquid level detection can be performed according to two capacitors with different capacitance values, respectively, to improve the accuracy of liquid level detection.
Optionally, the three polar plates of this embodiment are fixed in the oil cup by silica gel, and a certain gap is left between the periphery of the polar plate and the oil cup, the polar plate is made of a conductive material with corrosion resistance and wear resistance, and the polar plate is electrically connected with the detection device 1 by a contact snap spring.
In this embodiment, the control unit 2 is further configured to control the reference capacitor 4 to discharge based on the third control signal when the voltage across the reference capacitor 4 reaches the preset reference voltage Vref, control the power supply 3 to charge the second capacitor based on the fourth control signal when the reference capacitor 4 finishes discharging, control the second capacitor to charge the reference capacitor 4 based on the fifth control signal, and determine the height of the liquid level in the oil cup according to a second charging time for the second capacitor to charge the reference capacitor 4 to the preset reference voltage Vref; the fifth control signal is an inverted signal of the fourth control signal.
In a specific example, the fourth control signal is a high level signal, the fifth control signal is a low level signal, the control unit 2 continuously controls the power supply 3 to charge the first capacitor based on the high level signal, when the first capacitor reaches a certain voltage (which may be 3.3V), the control unit 2 sends out the low level signal, and the control unit 2 controls the first capacitor to charge the reference capacitor 4 based on the low level signal.
In another specific example, the fourth control signal and the fifth control signal are periodic signals, such as pulse signals, sent by the control unit 2, and therefore, the fourth control signal and the fifth control signal can be flexibly set according to application situations in the field.
Preferably, if the first charging time reaches the preset charging time and/or the second charging time reaches the preset charging time, the control unit 2 determines that the liquid level of the oil cup is full, and outputs a cup full prompt signal when the liquid level of the oil cup is full, that is, in this embodiment, the control unit 2 may determine whether the first charging time for the first capacitor to charge the reference capacitor 4 to the preset reference voltage Vref reaches the preset charging time, or determine whether the second charging time for the second capacitor to charge the reference capacitor 4 to the preset reference voltage Vref reaches the preset charging time, or continue to determine whether the second charging time for the second capacitor to charge the reference capacitor 4 to the preset reference voltage Vref reaches the preset charging time after the first charging time for the first capacitor to charge the reference capacitor 4 to the preset reference voltage Vref reaches the preset charging time, thereby the detection device of this embodiment can utilize the electric capacity that two polar plates formed to carry out the detection of liquid level height, also can utilize two electric capacities that three polar plate formed to carry out the detection of liquid level height in proper order to detect through twice and can effectively improve the accuracy that detects.
In an alternative embodiment, as shown in fig. 4, the switching unit 5 includes a first switch 501, a second switch 502, a third switch 503, a fourth switch 504, and an inverter 505.
Specifically, one end of the inverter 505 is connected to the control terminals of the control unit 2 and the second switch 502, the other end is connected to the control terminal of the first switch 501, one end of the first switch 501 is connected to the power supply 3, the other end is connected to one end of the second switch 502, one end of the third switch 503 and one end of the fourth switch 504, the other end of the second switch 502 is connected to the first input terminal of the comparison unit 6, the control terminal of the third switch 503 is connected to the control unit 2, the other end of the third switch 503 is connected to the first plate 101, the control terminal of the fourth switch 504 is connected to the control unit 2, and the other end of the fourth switch 504 is connected to the third plate 103.
In another alternative embodiment, as shown in fig. 4, the detection device 1 of the present embodiment further includes a discharge unit 7.
Specifically, the discharging unit 7 includes a fifth switch 701 and a resistor 702, one end of the reference capacitor 4 is connected to one end of the resistor 702 through the fifth switch 701, a control end of the fifth switch 701 is connected to the control unit, the other end of the resistor 702 is grounded, the control unit 2 is further configured to send a third control signal to the control end of the fifth switch 701, the fifth switch 701 connects the reference capacitor 4 to the resistor based on the third control signal, and through the discharging unit 7, it can be ensured that each capacitor is in an initial state each time liquid level detection is performed, and detection errors are further reduced.
In one embodiment, the control unit 2 records the charging time variation Δ c of the first capacitor in advance1The charging time variation Δ c of the second capacitor2Wherein, the charging time variation Δ c of the first capacitor of the embodiment1And a charging time variation Δ c of the second capacitor2Is arranged in the same manner as the charging time variation Δ c of the first capacitor in embodiment 11The setting method is the same, and is not described herein. When the control unit 2 completes the first capacitance detection, that is, the first capacitance charges to the reference capacitance to satisfy t2-t1＝Δc1The control module 2 controls the discharging unit 7 to discharge each capacitor to the initial state based on the third control signalAfter the state, the second capacitor is used for detection, the detection process is the same as that of the first capacitor, and is not described herein again, it should be noted that in this embodiment, only when the charging of the first capacitor to the reference capacitor satisfies t2-t1＝Δc1And the charging of the second capacitor to the reference capacitor satisfies t2-t1＝Δc2Then, the control unit 2 outputs a full cup prompt signal.
The detection device of this embodiment is outputting full cup prompt signal after through twice detection, ensures that detection device can not misreport and miss and report, has promoted user's use and has experienced.
Example 3
The embodiment provides a lampblack absorber, and the lampblack absorber of this embodiment includes the detection device of oil cup and the oil cup liquid level of embodiment 1 or embodiment 2.
The range hood of this embodiment is owing to adopted the detection device of the oil cup liquid level of embodiment 1 or embodiment 2, therefore, the range hood of this embodiment also can realize the effect of embodiment 1 or embodiment 2, does not need to describe here again.
While specific embodiments of the utility model have been described above, it will be appreciated by those skilled in the art that this is by way of example only, and that the scope of the utility model is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the spirit and scope of the utility model, and these changes and modifications are within the scope of the utility model.
Claims (9)
1. The device for detecting the liquid level of the oil cup is characterized by comprising a first polar plate, a second polar plate, a control unit, a power supply and a reference capacitor;
the first polar plate and the second polar plate are arranged in the oil cup, and the first polar plate and the second polar plate form a first capacitor; wherein the capacitance value of the first capacitor increases with the increase of the liquid level in the oil cup;
the control unit is used for controlling the power supply to charge the first capacitor based on a first control signal, controlling the first capacitor to charge the reference capacitor based on a second control signal, and determining the height of the liquid level in the oil cup according to first charging time of the first capacitor to charge the reference capacitor to a preset reference voltage;
wherein the second control signal is an inverted signal of the first control signal.
2. The apparatus for detecting the level of an oil cup according to claim 1, further comprising a switching unit and a comparing unit;
the first pole plate is connected with one end of the power supply or the reference capacitor through the switching unit, one end of the reference capacitor is connected with a first input end of the comparison unit, an output end of the comparison unit is connected with the control unit, a second input end of the comparison unit is connected with a reference power supply, the voltage of the reference power supply is a preset reference voltage, the control unit is further connected with the switching unit, and the second pole plate and the other end of the reference capacitor are grounded;
the control unit is further configured to send the first control signal to the switching unit, so that the first electrode plate is connected to the power supply; and sending the second control signal to the switching unit to connect the first plate with the reference capacitor.
3. The apparatus of claim 2, further comprising a third plate;
the third polar plate is arranged in the oil cup, the second polar plate and the third polar plate form a second capacitor, and the first polar plate, the second polar plate and the third polar plate are sequentially arranged along the length direction of the oil cup; wherein the capacitance value of the second capacitor increases with the increase of the liquid level in the oil cup;
the control unit is further used for controlling the reference capacitor to discharge based on a third control signal when the voltage at the two ends of the reference capacitor reaches the preset reference voltage;
when the reference capacitor finishes discharging, controlling the power supply to charge the second capacitor based on a fourth control signal, controlling the second capacitor to charge the reference capacitor based on a fifth control signal, and determining the height of the liquid level in the oil cup according to second charging time of the second capacitor to charge the reference capacitor to a preset reference voltage;
wherein the fifth control signal is an inverted signal of the fourth control signal.
4. The apparatus of claim 3, wherein a distance between the first plate and the second plate is less than a distance between the third plate and the second plate.
5. The apparatus for detecting the liquid level of an oil cup according to claim 3, wherein the switching unit comprises a first switch, a second switch, a third switch, a fourth switch and an inverter;
one end of the phase inverter is connected with the control unit and the control end of the second switch respectively, and the other end of the phase inverter is connected with the control end of the first switch;
one end of the first switch is connected with the power supply, and the other end of the first switch is respectively connected with one end of the second switch, one end of the third switch and one end of the fourth switch;
the other end of the second switch is connected with a first input end of the comparison unit;
the control end of the third switch is connected with the control unit, and the other end of the third switch is connected with the first polar plate;
and the control end of the fourth switch is connected with the control unit, and the other end of the fourth switch is connected with the third polar plate.
6. The apparatus of claim 3, further comprising a discharge unit;
the discharge unit comprises a fifth switch and a resistor;
one end of the reference capacitor is connected with one end of the resistor through the fifth switch, the control end of the fifth switch is connected with the control unit, and the other end of the resistor is grounded;
the control unit is further configured to send the third control signal to the control terminal of the fifth switch;
the fifth switch connects the reference capacitance to the resistance based on the third control signal.
7. The apparatus according to claim 3, wherein the control unit determines that the liquid level of the oil cup is full if the first charging time reaches a preset charging time and/or the second charging time reaches a preset charging time.
8. The apparatus of claim 7, wherein the control unit is further configured to output a cup full signal when the oil cup level is full.
9. A range hood, characterized in that it comprises an oil cup and a device for detecting the level of the oil cup according to any one of claims 1 to 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220055458.7U CN216668905U (en) | 2022-01-07 | 2022-01-07 | Detection apparatus for oil cup liquid level and lampblack absorber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220055458.7U CN216668905U (en) | 2022-01-07 | 2022-01-07 | Detection apparatus for oil cup liquid level and lampblack absorber |
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| CN216668905U true CN216668905U (en) | 2022-06-03 |
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| CN202220055458.7U Active CN216668905U (en) | 2022-01-07 | 2022-01-07 | Detection apparatus for oil cup liquid level and lampblack absorber |
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