CN105486386A - Liquid level detection device and method and multi-split air conditioner - Google Patents
Liquid level detection device and method and multi-split air conditioner Download PDFInfo
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- CN105486386A CN105486386A CN201610009114.1A CN201610009114A CN105486386A CN 105486386 A CN105486386 A CN 105486386A CN 201610009114 A CN201610009114 A CN 201610009114A CN 105486386 A CN105486386 A CN 105486386A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/30—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by floats
- G01F23/64—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by floats of the free float type without mechanical transmission elements
- G01F23/72—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by floats of the free float type without mechanical transmission elements using magnetically actuated indicating means
- G01F23/74—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by floats of the free float type without mechanical transmission elements using magnetically actuated indicating means for sensing changes in level only at discrete points
Abstract
The invention discloses a liquid level detection device which comprises a floater. The floater floats on the liquid level in a to-be-detected tank and rises and falls together with the liquid level. When a magnet is arranged in the floater, the liquid level detection device further comprises a plurality of Hall sensors which are arranged outside the detected tank and used for outputting corresponding voltage signals through position changes of the floater. When a signal transmitter is arranged in the floater, the liquid level detection device further comprises a plurality of signal receivers which are arranged outside the detected tank and used for receiving and transmitting signals transmitted by the signal transmitter. The liquid level detection device further comprises a signal processor which is connected with the Hall sensors or the signal receivers through signal lines and used for processing the voltage signals or the signals transmitted by the signal transmitter. The invention further discloses a liquid level detection method and a multi-split air conditioner. Acquisition and processing of liquid level detection signals are simplified, liquid level signals are converted into electric signals or other signals, and therefore the sealing performance of the to-be-detected tank is ensured, and meanwhile the service life of the detection device is also prolonged.
Description
Technical field
The present invention relates to Technology of Level Detection field, particularly relate to liquid level detection device, method and multi-gang air-conditioner device.
Background technology
Level sensing is generally used for the level sensing of liquid in high-low pressure tank body, and for guaranteeing relevant device (such as compressor) safe operation, whether the liquid level that must detect in tank body meets the demands.The conventional sensor level measuring method such as electric capacity, resistance need electric capacity or resistance to be placed in tank interior and with the such as liquid comes into contact such as lubricating oil, refrigerant, but because the bad working environments such as pressure, temperature, fluid scouring likely cause sensor degradation and not easily change, sensor needs signal wire to be sent out by the signal detected simultaneously, signal wire should meet sealing requirements through needing during tank body wall, also to guarantee the insulativity requirement between signal wire and metal wall, thus the method for welding can not be adopted, technological requirement is high, is therefore difficult to large-scale application.
The liquid-level detecting method generally adopted at present is before product is gone into operation, verify by experiment in laboratory, by on tank body, beat liquid-sighting glass and depending on liquid pipe with under observing different operating mode, under different operational mode, liquid level situation of change in different output situation, thus guarantee that liquid level is in operational envelope, thus just do not need to observe liquid level again after product goes into operation listing, only need timing by solving liquid level to decline or liquid level crosses the problems such as height as returned liquid process and running of finding time, although this type of mode is reliable, but need the conditional combination of checking a lot of in experimentation, and then the development time can be caused to extend, can not guarantee that product there will not be worse situation in follow-up actual motion completely simultaneously.
Summary of the invention
Fundamental purpose of the present invention is to provide a kind of liquid level detection device, method and multi-gang air-conditioner device, is intended to solve existing pick-up unit when detecting, easily makes pick-up unit damage, not easily changes and the technical matters of the sealing difference of tank body to be measured.
For achieving the above object, the invention provides a kind of liquid level detection device, be applied to the level sensing of liquid in tank body, described liquid level detection device comprises float, and described float to float in described liquid levels and follows liquid surface lifting and corresponding generation change in location;
Wherein, be provided with magnet in described float, described liquid level detection device also comprises the some Hall elements be arranged at outside tested tank body, and described Hall element is used for by the change in location of described float to export relevant voltage signal; Or,
Be provided with signal projector in described float, described liquid level detection device also comprises the some signal receivers be arranged at outside tested tank body, and described signal receiver is for the signal that receives described signal projector and launch and export;
Described liquid level detection device also comprises the signal processor be connected with described Hall element or described signal receiver by signal wire, the voltage signal that described signal processor exports for the treatment of the described Hall element received or the signal launched for the treatment of the described signal projector that described signal receiver exports.
Preferably, described liquid level detection device also comprises level gauging section parts, and described level gauging section parts are the hollow string configuration of both ends open, place, the bottom plane orthogonal of described level gauging section parts and described tested tank body;
Wherein, when described level gauging section parts are positioned at described tested tank body outside, described liquid level detection device also comprises the communication means of the both ends open for being communicated with described tested tank body and described level gauging section parts, enter in described level gauging section parts by described communication means to make the liquid in described tested tank body, described float to float in the described liquid levels in described level gauging section parts and follows liquid surface lifting and corresponding generation change in location, and described Hall element or described signal receiver are positioned at the outside of described level gauging section parts.
Preferably, described liquid level detection device also comprises level gauging section parts, and described level gauging section parts are the hollow string configuration of both ends open, place, the bottom plane orthogonal of described level gauging section parts and described tested tank body;
Wherein, when described level gauging section parts are positioned at described tested tank interior, one end of described level gauging section parts is positioned at described tested tank interior and the other end and described tested tank body ft connection, described float is the loop configuration being provided with impenetrating mouth, described level gauging section parts through the impenetrating mouth of described float so that the described liquid levels making described float float over outside described level gauging section parts to follow liquid surface lifting and corresponding generation change in location, described Hall element or described signal receiver are positioned at the inside of described level gauging section parts, wherein, described liquid level detection device also comprises limiting component, one end that described level gauging section parts are positioned at described tested tank interior is undertaken sealing by described limiting component and limits the change in location scope of described float.
Preferably, when described liquid level detection device at least comprises two described Hall elements or two described signal receivers, at least exist two described Hall elements or two described signal receivers different from the vertical range of place, the bottom plane of described tested tank body.
Preferably, the length of described level gauging section parts is less than the height of described tested tank body;
Described liquid level detection device comprises four described Hall elements, and two described Hall elements are one group and are arranged on the upper end in described level gauging section portion, and another two described Hall elements are another group and are arranged on the bottom in described level gauging section portion; Or,
Described liquid level detection device comprises four described signal receivers, and two described signal receivers are one group and are arranged on the upper end in described level gauging section portion, and another two described signal receivers are another group and are arranged on the bottom in described level gauging section portion.
Preferably, the length of described level gauging section parts is less than the height of described tested tank body;
When described liquid level detection device at least comprises two described Hall elements, Hall element described in each is in a row to form a Hall element group to aligned on top from the bottom of described level gauging section parts, and place, the bottom plane orthogonal of this Hall element group and described tested tank body; Or,
When described liquid level detection device at least comprises two described signal receivers, signal receiver described in each is in a row to form a signal receiver group to aligned on top from the bottom of described level gauging section parts, and place, the bottom plane orthogonal of this signal receiver group and described tested tank body.
Preferably, when described liquid level detection device at least comprises two described Hall elements, exist between the sensing range of adjacent two described Hall elements and partly overlap; Or, when described liquid level detection device at least comprises two described signal receivers, exist between the sensing range of adjacent two described signal receivers and partly overlap.
Further, for achieving the above object, the present invention also provides a kind of liquid-level detecting method based on liquid level detection device described in above-mentioned any one, and described liquid-level detecting method comprises step:
S1, signal processor receive the signal that voltage signal that Hall element exported by the change in location of the float being built-in with magnet or Received signal strength receiver export by receiving the change in location that is built-in with the float of signal projector;
S2, the signal exported according to described voltage signal or described signal receiver, determine liquid level or the liquid level change direction of liquid in current tank body to be measured.
Preferably, after step S1, described liquid-level detecting method also comprises step:
Judge whether the described voltage signal pace of change in the first preset duration is less than First Speed threshold value or judges whether the signal intensity speed that the described signal receiver in the second preset duration exports is less than second speed threshold value;
If so, then step S2 is performed;
If not, then step S1 is returned after waiting for the 3rd preset duration.
Further, for achieving the above object, the present invention also provides a kind of multi-gang air-conditioner device, and described multi-gang air-conditioner device comprises the liquid level detection device described in above-mentioned any one.
The present invention is by being converted into electric signal or other signals indirectly to realize level sensing by liquid level signal, without the need to adopting signal wire to connect in synchronous signal conversion process, thus simplify the Acquire and process of level sensing signal, liquid level signal is converted into the sealing that electric signal or other signals can guarantee tank body to be measured.In addition, due to Hall element or signal receiver external, thus the impact being subject to the bad working environments such as pressure in tank body, temperature, fluid scouring can be avoided, and then improve the serviceable life of pick-up unit, be also convenient to the maintenance works such as the replacing of Hall element or signal receiver simultaneously.
Accompanying drawing explanation
Fig. 1 is the structural representation that application liquid level detection device of the present invention carries out level sensing first embodiment;
Fig. 2 is the principle of work schematic diagram of Hall element one embodiment in Fig. 1;
Fig. 3 is the structural representation that application liquid level detection device of the present invention carries out level sensing second embodiment;
Fig. 4 is the structural representation that application liquid level detection device of the present invention carries out level sensing the 3rd embodiment;
Fig. 5 is the structural representation of liquid level detection device one embodiment of the present invention;
Fig. 6 is the structural representation of another embodiment of liquid level detection device of the present invention;
Fig. 7 is the structural representation that employing two Hall elements carry out level sensing one embodiment;
Fig. 8 is the structural representation that employing two Hall elements carry out another embodiment of level sensing;
Fig. 9 is the structural representation that employing four Hall elements carry out level sensing one embodiment;
Figure 10 is the structural representation that employing four Hall elements carry out another embodiment of level sensing;
Figure 11 is the structural representation adopting multiple Hall element to carry out level sensing one embodiment;
Figure 12 is the structural representation adopting multiple Hall element to carry out another embodiment of level sensing;
Figure 13 is the schematic flow sheet of liquid-level detecting method one embodiment of the present invention;
Figure 14 is the schematic flow sheet of another embodiment of liquid-level detecting method of the present invention;
Figure 15 is the high-level schematic functional block diagram of multi-gang air-conditioner device one embodiment of the present invention.
The realization of the object of the invention, functional characteristics and advantage will in conjunction with the embodiments, are described further with reference to accompanying drawing.
Embodiment
Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
The level sensing of liquid in the tank body that liquid level detection device of the present invention is mainly used in sealing, the level sensing etc. of liquid refrigerants in the oil level detection in such as compressor, gas-liquid separator.Especially by use ball cock device in the present invention, thus enable ball cock device follow liquid surface lifting and corresponding generation change in location, simultaneously, for the measurement of the oil level in tested tank body or liquid level being converted into the position measurement of floating ball device, by adding magnet or signal projector (such as ultrasonic transmitter in float, neutron howitzer etc.), thus while ball cock device generation change in location corresponding generation change of magnetic field strength or change in signal strength, and then measure change of magnetic field strength by Hall element again or changed with the measurement indirectly realizing liquid level in tested tank body by signal receiver measure signal intensity.Wherein, magnet is added or signal projector is specifically arranged according to actual needs in ball cock device, because the two ultimate principle realizing level sensing similarly (also magnet can be replaced with signal projector, and Hall element is replaced with signal receiver), therefore, for ease of being illustrated the present invention, therefore, only specifically be illustrated with magnet and Hall element in all embodiments of the present invention, and the explanation of signal projector and signal receiver is no longer done too much repeat.
With reference to the structural representation that Fig. 1, Fig. 1 are liquid level detection device one embodiment of the present invention.
In the present embodiment, liquid level detection device is applied to the level sensing of liquid in tank body 1, and wherein, liquid level detection device comprises float 2, and float 2 can to float in liquid levels and to follow liquid surface lifting when liquid levels change in location and corresponding generation change in location.It should be noted that, the part that there is shade in all figure of the present invention is collectively expressed as the region that can there is liquid.
In addition, float 2 inside is also provided with magnet (not shown), the change of magnetic field strength of corresponding generation when float 2 is subjected to displacement change is followed by recording magnet, therefore, liquid level detection device also comprises the some Hall elements 3 be arranged at outside tank body 1, Hall element 3 for by the change in location of float 2 to export relevant voltage signal, liquid level detection device is also comprised and to be received by signal wire 4 and to process the signal processor 5 of the voltage signal that Hall element 3 exports.In addition, for the special applications sight needing manual shift liquid level, user realizes the remote monitoring to liquid level in tank body 1 by signal wire 4.
The principle of work schematic diagram of Hall element one embodiment as shown in Figure 2.Wherein, the principle of work of Hall element 3 is: after input On current between x and y port, if the Shang You magnetic field, direction now shown in Fig. 2 is through Hall element 3, between u and v two-port, then just have generation voltage signal export, the size of this voltage is directly proportional to magnetic field intensity.
When supposing that the magnetic field detected when Hall element 3 exceedes some strength, then output HIGH voltage, represents by state 1, otherwise does not have voltage signal to export, and represents by state 0.The magnetic field intensity that Hall element 3 detects is relevant with the position of magnet, if Hall element 3 and magnet at a distance of nearer, then the magnetic field intensity that detects of Hall element 3 is larger, otherwise then less.When magnet moves left and right in the scope of the detecting domains △ L shown in Fig. 2, Hall element 3 output state 1, and after magnet moves and exceeds detecting domains △ L scope, then Hall element 3 output state 0, then utilize the principle of work of above-mentioned Hall element namely can be judged the position of float 2 by the State-output of Hall element 3, thus the liquid level of liquid in tank body 1 in Fig. 1 can be judged further.Such as, Hall element 3 is set in height as shown in Figure 1, if in tank body 1, the liquid level of liquid is in fuller normal condition during original state, then when signal processor 5 receives Hall element 3 output state 1 first, then illustrate that the liquid level of liquid in current tank body 1 has been in warning liquid level.
In addition, what needs further illustrated is, liquid level detection device is as shown in Figure 1 only applicable to the level sensing in small-sized and regular tank body, and for the level sensing of large tank, because the size of magnetic field intensity or other signal intensities is relevant to distance, if float 2 and the distance of Hall element 3 are separated by too far away, then can have influence on the induction of Hall element 3 for magnetic field intensity, and then have influence on the effect of level sensing.In addition, float 2 is easily caused to be stuck for the level sensing of irregular tank body or the change in location of float 2 accurately can not reflect the eustasy of liquid level.
In the present embodiment, by liquid level signal being converted into electric signal indirectly to realize level sensing, without the need to adopting signal wire to connect in synchronous signal conversion process, thus simplifying the Acquire and process of level sensing signal, liquid level signal being converted into the sealing that electric signal can guarantee tank body to be measured.In addition, because Hall element is external, thus the impact being subject to the bad working environments such as pressure in tank body, temperature, fluid scouring can be avoided, and then improve the serviceable life of pick-up unit, also be convenient to the maintenance works such as the replacing of Hall element, meanwhile, Hall element quantity and position can be arranged flexibly simultaneously, thus can not only be judged the liquid level of liquid in tank body 1 by the output state of Hall element, also judge the liquid level situation of change of liquid in tank body 1 by multiple Hall element.
For solving the problem in above-described embodiment, with reference to Fig. 3, in an embodiment of liquid level detection device of the present invention, liquid level detection device also comprises level gauging section parts 6, these level gauging section parts 6 are preferably the hollow string configuration of both ends open, the cylindrical structure of such as hollow or the rectangular structure of hollow.In addition, these level gauging section parts 6 are made up of the material that can penetrate magnetic field or other signals, such as copper pipe.Meanwhile, be stuck by avoiding float 2 or affected by other external factor, therefore, preferably float 2 being set to spheroid form.
In the present embodiment, based on the connection principle of linker, level gauging section parts 6 can be communicated with tank body 1, and then make the liquid in tank body 1 enter in level gauging section parts 6, float 2 is arranged in level gauging section parts 6 simultaneously, thus make float 2 also correspondingly can follow liquid surface lifting in tank body 1 and corresponding generation change in location, even if thus the out-of-shape of tank body 1 or specification are comparatively large, float 2 and Hall element 3 also can the liquid levels of liquid in Measurement accuracy tank body 1 by level gauging section parts 6.Hall element 3 is arranged at the outside of level gauging section parts 6, such as, can be buckled on the outer wall of level gauging section parts 6, or also can be arranged on other support components, specifically can arrange according to actual needs.
As shown in Figure 3, in the present embodiment, liquid level detection device also comprises communication means 7 for being communicated with tank body 1 and the both ends open of level gauging section parts 6 and for ensureing the sealing of tank body 1 and the converting interface 8 for sealing.Wherein, the sealing means of converting interface 8 includes but not limited to welding, enlarging connection, nut connection etc.In addition, for avoiding float 2 to enter in tank body 1, therefore, can based on the diameter of float 2 diameter of relative set communication means 7, such as the diameter of communication means 7 is set to 3/4 of the diameter of float 2.
In addition, due to float 2 change in location specifically by liquid to caused by the center of gravity gravitation of the buoyancy of float 2 and float 2 itself, and generally, buoyancy and gravitation are all perpendicular to place plane bottom tank body 1, therefore based on the consideration of level sensing precision, preferred level gauging section parts 6 are arranged with place, the bottom plane orthogonal of tank body 1, as shown in Figure 3.
In addition, it should be noted that, what it may occur to persons skilled in the art that is, also can carry out corresponding improvement to adapt to level sensing mode of the present invention to the shape and structure of tank body 1, such as level gauging section parts 6 are designed to a part for tank body 1, but this type of mode customizes tank body due to needs, therefore while making tank body, need float to put into in advance, and then add manufacture craft and the flow process of production, thus practicality is relatively not high.
Further alternative, level gauging section parts 6 also can be arranged on the inside of tank body 1.With reference to another embodiment of level gauging section parts set-up mode in Fig. 4, Fig. 4 liquid level detection device.In the present embodiment, the shape and structure of level gauging section parts 6 is same as the previously described embodiments, does not therefore repeat.
In the present embodiment, one end of preferred level gauging section parts 6 is positioned at the inside of tank body 1, the other end is then concordant with the bottom of tank body 1 and keep and the ft connection of tank body 1, Hall element 3 is arranged on the inside of level gauging section parts 6, float 4 is arranged on the outside of level gauging section parts 6 simultaneously.
In addition, ensureing float 4 can follow liquid surface lifting while corresponding generation change in location, also the detecting distance that float 4 and Hall element 3 can be remained valid is ensured, therefore, preferably float 4 is set to the loop configuration with impenetrating mouth, and makes level gauging section parts 6 through the impenetrating mouth of float 4.
As shown in Figure 4, based on the consideration of level sensing precision, preferred level gauging section parts 6 are arranged with place, the bottom plane orthogonal of tank body 1.Meanwhile, due to level gauging section parts 6 both ends open, therefore, need to carry out encapsulation process to level gauging section parts 6 both ends open place, seal as by the converting interface 8 such as described in above-described embodiment.In addition, be limit the change in location scope of float 4, one end place that can be positioned at tank body 1 inside at level gauging section parts 6 arranges a limiting component 9 with while sealing the opening of level gauging section parts 6, also can the change in location scope of corresponding restriction float 4.
What needs further illustrated is, in the present embodiment, measuring section parts 6 also can be inserted in tank body 1 from the top of tank body 1, or are inserted in tank body 1 by a communication means from the sidewall of tank body 1, concrete set-up mode is substantially identical with above-mentioned set-up mode, does not therefore do too much repeating.
In the above-described embodiments, when only having a Hall element 3, if now the output state of Hall element 3 is 1, within then illustrating that the position of magnet (being also float 2) is in the △ L scope centered by Hall element 3, but concrete position is still uncertain, if detect that the output state of Hall element 3 becomes 0 from 1, then can only illustrate that magnet (being also float 2) has moved to beyond △ L scope, but cannot determine specifically from which lateral movement, also namely cannot determine the change in location direction of magnet (also i.e. float 2).
Therefore, for solving the problem, with reference to Fig. 5, in an embodiment of liquid level detection device of the present invention, two Hall elements 3 are arranged into one group and form a sensor pair, make to there is part between each self-corresponding detecting domains of these two Hall elements 3 overlapped, as shown in Figure 5 simultaneously.
Fig. 5 is the external embodiments of measuring section parts, in the present embodiment, Hall element 31, Hall element 32 are one group of sensor to and be positioned at the outside of measuring section parts 6, float 2 is positioned at the inside of measuring section parts 6, A, B, C, D are four position reference points on measuring section parts 6, wherein, and the detecting domains of AC Range Representation Hall element 31, the detecting domains of BD Range Representation Hall element 32, BC then represents the lap between the respective detecting domains of Hall element 31,32.When float 2 (including magnet) is in AB scope, Hall element 31,32 is output state 1,0 (same above-described embodiment of implication of output state 1 and 0) respectively, when float 2 is in BC scope, Hall element 31,32 is output state 1,1 respectively, when float 2 is in CD scope, Hall element 31,32 is output state 0,1 respectively, when float 2 is in outside AD scope, Hall element 31, 32 difference output states 0, 0, compared with single Hall element, the output state one of two Hall elements has four kinds of combinations, represent float 2 respectively and be in different positions, thus improve measuring accuracy, measurement range has also expanded AD to from AC, in addition, by current Hall element output state being judged compared with a upper moment Hall element output state change direction of float 2 position further, such as when Hall element 31, the output state of 32 is by 1, 0 changes 0 into, when 0, then can judge that float 2 leaves AB scope from A side position, and when Hall element 31, the output state of 32 is by 0, 1 changes 0 into, when 0, then can judge that float 2 leaves CD scope from D side position.
In addition, be the built-in embodiments of measuring section parts with reference to Fig. 6, Fig. 6.Wherein, Hall element 31, Hall element 32 are one group of sensor to and be positioned at the inside of measuring section parts 6, float 2 (being built-in with magnet) is positioned at the outside of measuring section parts 6, A, B, C, D are four position reference points on measuring section parts 6, in the present embodiment, that improves level sensing precision by multiple Hall element illustrates a same embodiment, does not therefore do too much repeating in the present embodiment.
It should be noted that, consider that the change in location direction of float 2 is generally from top to bottom (also namely liquid level constantly declines) and from top to bottom (also namely liquid level constantly rises), therefore, when liquid level detection device at least comprises two Hall elements, for improving level sensing precision further, therefore at least need guarantee two Hall elements different from the vertical range of place, the bottom plane of tested tank body, level sensing precision cannot be improved when also namely needing to avoid all Hall elements to be all in same level.
The sensor adopting multiple Hall element to form in above-mentioned two embodiments is to also improving the precision of level sensing further by with under type: one is the detecting domains △ L changing single Hall element, specifically by regulating the threshold value of the detection size of current of institute's conducting on Hall element, magnet size and triggering output voltage to arrange; Two is regulate the lap of multiple Hall element separately between detecting domains, specifically by regulating the distance side by side between adjacent two Hall elements.Therefore, the present invention has very large dirigibility and fast easy to adjust for improving the precision of level sensing.
Reference Fig. 7, Fig. 7 are the structural representation that employing two Hall elements carry out level sensing one embodiment.
In the present embodiment, float 2 can be followed the change of liquid level in measuring section parts 6 and move up and down, and Hall element 31,32 is placed on the outside of measuring section parts 6 to detect the change of the magnetic field intensity of float 2 internal magnet and output state is passed to signal processor 5 by signal wire 4.In the present embodiment, the detecting domains △ L of Hall element 31,32 arranges identical, and the overlapping range of two sensor detecting domains is arranged to 0.5 △ L preferably.
Liquid level detection device in the present embodiment only has two Hall elements, and thus measurement range is limited, but still can provide four kinds of different output states (1,1; 1,0; 0,1; 0,0) to reflect the approximate location of liquid level, be thus applicable to measuring accuracy less demanding or pay close attention to a certain among a small circle in the application scenarios of level condition.The oil level such as detecting compressor whether lower than certain critical point, when detect liquid level lower than setting critical point time to system send oil return running order; Or whether the liquid level detecting low pressure tank has exceeded some critical points, send running order of finding time to system when detecting low pressure tank liquid level and being too high.
Further, reference Fig. 8, Fig. 8 is the structural representation that employing two Hall elements carry out another embodiment of level sensing.In the present embodiment, Hall element group 31, 32 are built in measuring section parts 6, the inside of measuring section parts 6 communicates with the external world, Hall element 31, 32 can take out easily from measuring section parts 6, signal wire 4 passes converting interface 8 by Hall element 31, 32 are connected with signal processor 5, float 2 can be followed the liquid level change outside measuring section parts 6 and move up and down, one end of measuring section parts 6 seals and is limited in below it by the range of movement of float 2 by limiting component 9, wherein, the length of measuring section parts 6 can according to the requirement unrestricted choice of measurement range.
Reference Fig. 9, Fig. 9 are the structural representation that employing four Hall elements carry out level sensing one embodiment.
In the present embodiment, liquid level detection device comprises four Hall element 31-34, wherein, Hall element 31,32 is one group and is arranged on the outside of level gauging section parts 6 upper end, and Hall element 33,34 is one group and is arranged on the outside of the lower end of level gauging section parts 6.The length of level gauging section parts 6 is less than the height of tank body 1.Wherein, the spacing between Hall element 31,32 and the spacing between Hall element 32,33 all can regulate according to actual needs.In the present embodiment, the Cleaning Principle of liquid level detection device and the same above-described embodiment of relevant set-up mode, therefore do not do and too much repeat.
In addition, employing four Hall elements as shown in Figure 10 carry out the structural representation of another embodiment of level sensing.
In the present embodiment, liquid level detection device comprises four Hall element 31-34, wherein, Hall element 31,32 is one group and is arranged on the inside of level gauging section parts 6 upper end, and Hall element 33,34 is one group and is arranged on the inside of the lower end of level gauging section parts 6.The length of level gauging section parts 6 is less than the height of tank body 1.In the present embodiment, the Cleaning Principle of liquid level detection device and the same above-described embodiment of relevant set-up mode, therefore do not do and too much repeat.
Adopt two groups of four Hall elements in above-mentioned two embodiments, wherein one group is high liquid level sensor, whether exceeds certain maximal value for detecting liquid level; Other one group is low liquid level sensor, for whether detecting liquid level lower than minimum value.Such as in the oil level detection of compressor, can be remained within safe range in order to detection control lubricant in compressor by the liquid level detection device of two groups of four Hall elements.
In the above-described embodiments, Hall element 32, if the spacing between 33 arranges too much, then cannot accurately judge Hall element 32, liquid level situation of change between 33 in scope, therefore, in order to obtain continuous print level sensing, in another embodiment of liquid level detection device of the present invention, by multiple Hall element 3 is arranged in a row to form a Hall element group 30, make to exist between the detecting domains of wherein every two adjacent Hall elements 3 to partly overlap simultaneously, with reference to Cleaning Principle and the relevant set-up mode of liquid level detection device in the various embodiments described above, the position of float 2 accurately can be judged according to the output state of Hall element 3 different in Hall element group 30, also accurately can judge the direction of motion of float 2 according to the output state change of Hall element 3 different in Hall element group 30 simultaneously, it should be noted that, preferred Hall element group 30 keeps vertical with place, the bottom plane of tank body 1, and then maximization provides level sensing precision, concrete as Figure 11, shown in 12.
Wherein, Figure 11 is the external specific embodiment carrying out level sensing of multiple Hall element, Figure 12 is the built-in specific embodiment carrying out level sensing of multiple Hall element, and the key distinction of the two is that Hall element 3 is different relative to the set-up mode of level gauging section parts 6 from float 2.When above-mentioned two kinds of level sensing schemes are used in oil level and the level sensing of compressor or low pressure tank, high-precision continuous level sensing can be obtained.In the present embodiment, the Cleaning Principle of liquid level detection device and the same above-described embodiment of relevant set-up mode, therefore do not do and too much repeat.But, need to further illustrate, when liquid level detection device at least comprises two Hall elements 3, need to be set to partly overlap between the sensing range of adjacent two Hall elements 3, thus be convenient to the change in location direction accurately judging float 2.
Based on each embodiment of above-mentioned liquid level detection device, present invention also offers a kind of liquid-level detecting method.What need to be described in advance is, magnet is added or signal projector is specifically arranged according to actual needs in float, but the two ultimate principle realizing level sensing is similar, also magnet can be replaced with signal projector, and Hall element is replaced with signal receiver.
With reference to the schematic flow sheet that Figure 13, Figure 13 are liquid-level detecting method one embodiment of the present invention.Carry out level sensing based on the liquid level detection device in the various embodiments described above, described liquid-level detecting method comprises:
Step S1, signal processor receives the signal that voltage signal that Hall element exported by the change in location of the float being built-in with magnet or Received signal strength receiver export by receiving the change in location that is built-in with the float of signal projector;
(1) when being set to magnet in float, adopting magnet and Hall element to combine and carrying out level sensing;
Based on the basic functional principle of Hall element as shown in Figure 2, when after Hall element energising, if there is relative motion between Hall element and float and magnetic field intensity is comparatively large, voltage signal can be produced at Hall element and export to signal processor and carry out respective handling.
(2) when being set to signal projector in float, adopting signal projector and signal receiver to combine and carrying out level sensing; Such as ultrasonic transmitter and receiver, neutron howitzer and receiver.
Such as, ultrasound wave is due to the change of transmission range and transmission medium (as liquid, air etc.), and then make that intensity of acoustic wave is also corresponding to change, therefore, by analytic signal receiver, signal processor says that the intensity of acoustic wave received carries out corresponding judgement.
Step S2, according to the signal that described voltage signal or described signal receiver export, determines liquid level or the liquid level change direction of liquid in current tank body to be measured.
Such as signal processor can determine the liquid level of liquid in current tank body according to the intensity of voltage signal, the change exported according to voltage signal and determine the liquid level change direction of liquid in current tank body, concrete as described in Fig. 5 and Fig. 6.
In the present embodiment, by liquid level signal being converted into electric signal or other signals thus indirectly realizing level sensing, without the need to adopting signal wire to connect in synchronous signal conversion process, thus the Acquire and process of level sensing signal is simplified, in addition, the detection that the present embodiment can also realize liquid level and liquid level change direction judges, thus accurately can carry out intellectual monitoring and control to the liquid level of liquid in tank body more comprehensively.Meanwhile, the precision of level sensing also can be realized by the quantity increasing and decreasing sensor, and thus can meet the demand of various actual conditions flexibly, practicality is stronger.
With reference to the schematic flow sheet that Figure 14, Figure 14 are another embodiment of liquid-level detecting method of the present invention.Based on above-mentioned liquid-level detecting method embodiment, in the present embodiment, after above-mentioned steps S1, described liquid-level detecting method also comprises:
Step S31, judges whether the described voltage signal pace of change in the first preset duration is less than First Speed threshold value or judges whether the signal intensity speed that the described signal receiver in the second preset duration exports is less than second speed threshold value;
Step S32, if so, then performs step S2;
Step S32, if not, then returns step S1 after waiting for the 3rd preset duration.
In the above-described embodiments, when detecting to judge liquid level, except the position of the output state determination float according to Hall element (or signal receiver) and direction of motion, also need the process considering some special cases, such as when detecting the liquid level of low-voltage tube, if freeze machine start-up operation doing, then when compressor is opened, the potpourri of compressor oil and liquid refrigerants can produce a lot of foam and produce an impulsive force upwards to float and make float fast upward motion under the impact of high-velocity fluid, but the liquid level of reality is so not high, float finally can get back to the liquid level position of actual correspondence under gravity.
Therefore, for above-mentioned special applications sight, in the present embodiment, in order to eliminate the liquid level erroneous judgement as above-mentioned foam shock float causes, if detect that floating ball device motion is too fast, when exceeding the speed of some settings, then ignore current liquid level and judge, until by the time doing level sensing and judgement again when liquid level is steadily got off, thus avoid judging by accident and the actual conditions of true reflection liquid level.
In the present embodiment, the signal intensity speed that the change of float movement speed specifically exports by the voltage signal pace of change in Preset Time or signal receiver detects.Wherein, the first preset duration, the second preset duration, the 3rd preset duration and First Speed threshold value, second speed threshold value are specifically arranged according to practical application.
With reference to the high-level schematic functional block diagram that Figure 15, Figure 15 are multi-gang air-conditioner device one embodiment of the present invention.In the present embodiment, multi-gang air-conditioner device comprises the liquid level detection device 110 described in above-mentioned any one embodiment.
In the present embodiment, multi-gang air-conditioner device can realize the level sensing etc. of oil level detection to compressor and gas-liquid separator by liquid level detection device 110, concrete level sensing realizes principle and implementation with described in above-described embodiment, does not therefore do in the present embodiment and too much repeats.
The present embodiment can bring following following beneficial effect when being applied in oil level and the level sensing of multi-gang air-conditioner device:
1) a kind of method of simple and effective real-time monitoring oil level and liquid level is provided, by liquid level signal being transformed into electric signal and then facilitating Based Intelligent Control;
2) achieve the isolation of sensor and testing liquid, improve the serviceable life of sensor, safeguard with replacing also convenient simultaneously when breaking down;
3) sensor and signal wire etc. are all in outside liquid, and level gauging section parts and tank body interface easily adopt the mode such as to weld to guarantee the sealing of tank body;
4) position of sensor arranges adjustable, and the precision of detection also can be realized by the quantity increasing and decreasing sensor, and thus can meet the demand of various actual conditions flexibly, therefore practicality is also stronger.
These are only the preferred embodiments of the present invention; not thereby the scope of the claims of the present invention is limited; every utilize instructions of the present invention and accompanying drawing content to do equivalent structure or equivalent flow process conversion; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present invention.
Claims (10)
1. a liquid level detection device, is applied to the level sensing of liquid in tank body, it is characterized in that, described liquid level detection device comprises float, and described float to float in described liquid levels and follows liquid surface lifting and corresponding generation change in location;
Wherein, be provided with magnet in described float, described liquid level detection device also comprises the some Hall elements be arranged at outside tested tank body, and described Hall element is used for by the change in location of described float to export relevant voltage signal; Or,
Be provided with signal projector in described float, described liquid level detection device also comprises the some signal receivers be arranged at outside tested tank body, and described signal receiver is for the signal that receives described signal projector and launch and export;
Described liquid level detection device also comprises the signal processor be connected with described Hall element or described signal receiver by signal wire, the voltage signal that described signal processor exports for the treatment of the described Hall element received or the signal launched for the treatment of the described signal projector that described signal receiver exports.
2. liquid level detection device as claimed in claim 1, it is characterized in that, described liquid level detection device also comprises level gauging section parts, and described level gauging section parts are the hollow string configuration of both ends open, place, the bottom plane orthogonal of described level gauging section parts and described tested tank body;
Wherein, when described level gauging section parts are positioned at described tested tank body outside, described liquid level detection device also comprises the communication means of the both ends open for being communicated with described tested tank body and described level gauging section parts, enter in described level gauging section parts by described communication means to make the liquid in described tested tank body, described float to float in the described liquid levels in described level gauging section parts and follows liquid surface lifting and corresponding generation change in location, and described Hall element or described signal receiver are positioned at the outside of described level gauging section parts.
3. liquid level detection device as claimed in claim 1, it is characterized in that, described liquid level detection device also comprises level gauging section parts, and described level gauging section parts are the hollow string configuration of both ends open, place, the bottom plane orthogonal of described level gauging section parts and described tested tank body;
Wherein, when described level gauging section parts are positioned at described tested tank interior, one end of described level gauging section parts is positioned at described tested tank interior and the other end and described tested tank body ft connection, described float is the loop configuration being provided with impenetrating mouth, described level gauging section parts through the impenetrating mouth of described float so that the described liquid levels making described float float over outside described level gauging section parts to follow liquid surface lifting and corresponding generation change in location, described Hall element or described signal receiver are positioned at the inside of described level gauging section parts, wherein, described liquid level detection device also comprises limiting component, one end that described level gauging section parts are positioned at described tested tank interior is undertaken sealing by described limiting component and limits the change in location scope of described float.
4. the liquid level detection device according to any one of claim 1-3, it is characterized in that, when described liquid level detection device at least comprises two described Hall elements or two described signal receivers, at least exist two described Hall elements or two described signal receivers different from the vertical range of place, the bottom plane of described tested tank body.
5. liquid level detection device as claimed in claim 2 or claim 3, it is characterized in that, the length of described level gauging section parts is less than the height of described tested tank body;
Described liquid level detection device comprises four described Hall elements, and two described Hall elements are one group and are arranged on the upper end in described level gauging section portion, and another two described Hall elements are another group and are arranged on the bottom in described level gauging section portion; Or,
Described liquid level detection device comprises four described signal receivers, and two described signal receivers are one group and are arranged on the upper end in described level gauging section portion, and another two described signal receivers are another group and are arranged on the bottom in described level gauging section portion.
6. liquid level detection device as claimed in claim 2 or claim 3, it is characterized in that, the length of described level gauging section parts is less than the height of described tested tank body;
When described liquid level detection device at least comprises two described Hall elements, Hall element described in each is in a row to form a Hall element group to aligned on top from the bottom of described level gauging section parts, and place, the bottom plane orthogonal of this Hall element group and described tested tank body; Or,
When described liquid level detection device at least comprises two described signal receivers, signal receiver described in each is in a row to form a signal receiver group to aligned on top from the bottom of described level gauging section parts, and place, the bottom plane orthogonal of this signal receiver group and described tested tank body.
7. liquid level detection device as claimed in claim 6, is characterized in that, when described liquid level detection device at least comprises two described Hall elements, existing and partly overlap between the sensing range of adjacent two described Hall elements; Or, when described liquid level detection device at least comprises two described signal receivers, exist between the sensing range of adjacent two described signal receivers and partly overlap.
8., based on a liquid-level detecting method for liquid level detection device according to any one of claim 1-7, it is characterized in that, described liquid-level detecting method comprises step:
S1, signal processor receive the signal that voltage signal that Hall element exported by the change in location of the float being built-in with magnet or Received signal strength receiver export by receiving the change in location that is built-in with the float of signal projector;
S2, the signal exported according to described voltage signal or described signal receiver, determine liquid level or the liquid level change direction of liquid in current tank body to be measured.
9. liquid-level detecting method as claimed in claim 8, it is characterized in that, after step S1, described liquid-level detecting method also comprises step:
Judge whether the described voltage signal pace of change in the first preset duration is less than First Speed threshold value or judges whether the signal intensity speed that the described signal receiver in the second preset duration exports is less than second speed threshold value;
If so, then step S2 is performed;
If not, then step S1 is returned after waiting for the 3rd preset duration.
10. a multi-gang air-conditioner device, is characterized in that, described multi-gang air-conditioner device comprises the liquid level detection device according to any one of claim 1-7.
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| CN106092273A (en) * | 2016-08-11 | 2016-11-09 | 东莞正扬电子机械有限公司 | Liquid-level detecting method and liquid level sensor |
| CN106679766A (en) * | 2017-03-03 | 2017-05-17 | 西安君晖航空科技有限公司 | Non-contact type liquid-level detecting device for non-magnetic material container |
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| CN112504582A (en) * | 2019-09-13 | 2021-03-16 | 弗洛科技公司 | Low-power consumption toilet water tank leakage detection device |
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