Fragrance diffusion equipment

Abstract

The invention provides fragrance diffusion equipment which comprises a liquid storage bottle, a liquid level detection electrode, a reference electrode and a controller electrically connected with the liquid level detection electrode and the reference electrode, the liquid level detection electrode and the reference electrode are arranged on the outer wall of the liquid storage bottle or located on the outer side of the liquid storage bottle, and the distance between the liquid level detection electrode and the outer wall of the liquid storage bottle ranges from 0.1 mm to 20 mm. The liquid level detection electrode extends in the liquid level height direction, the number of the reference electrode is at least one, the reference electrode is adjacent to the bottom of the liquid storage bottle, the controller calculates the liquid level height in the liquid storage bottle according to detection signals of the liquid level detection electrode and the reference electrode, and the liquid level detection device is suitable for detecting the liquid level heights of different liquids.

Description

Technical Field

[0001] The invention relates to the field of liquid height detection, and in particular to a fragrance diffusion device. Background Art

[0002] At present, for measuring the liquid height in a container, the existing technology mainly adopts direct measurement method and indirect measurement method. The direct measurement method is to use a buoy-type device to perform direct measurement inside the container. This method has requirements on the waterproofness and corrosion resistance of the buoy-type device. At the same time, there will be liquid residue on the surface of the buoy-type device, which will affect the accuracy of liquid level detection. At the same time, the buoy-type device will occupy the volume of the container. The indirect measurement method generally sets a capacitance test electrode on the outer wall of the container to determine the liquid level height by the change in capacitance.

[0003] The existing capacitance test electrodes are only distributed at some height positions of the container, and can only detect the liquid level at a specific height, and cannot measure any liquid level height; at the same time, when detecting different liquid levels, the frequency of the point electrode is inconsistent; the existing technology only obtains data changes through the test electrode, and cannot detect the liquid level heights of different liquids. Summary of the invention

[0004] In view of this, an object of the present invention is to provide a fragrance diffusion device capable of detecting the liquid level heights of different liquids.

[0005] In order to solve the above technical problems, the technical solution used in the present invention is:

[0006] The present invention provides a fragrance diffusion device, comprising an atomizing device and a liquid storage bottle connected to the atomizing device, wherein the liquid storage bottle is made of insulating material, the atomizing device is used to atomize the liquid in the liquid storage bottle and diffuse it outward, the fragrance diffusion device also comprises a liquid level detection electrode, a reference electrode and a controller electrically connected to the liquid level detection electrode and the reference electrode, the liquid level detection electrode and the reference electrode are arranged on the outer wall of the liquid storage bottle or are located outside the liquid storage bottle and are spaced 0.1 mm-20 mm from the outer wall of the liquid storage bottle, the liquid level detection electrode extends along the liquid level height direction, the reference electrode is at least provided with one and is adjacent to the bottom of the liquid storage bottle, and the controller calculates the liquid level height in the liquid storage bottle according to the detection signals of the liquid level detection electrode and the reference electrode.

[0007] Preferably, a plurality of liquid level detection electrodes are provided, and in the liquid level height direction, the liquid level detection electrodes are located above the reference electrode.

[0008] Preferably, two liquid level detection electrodes are provided and located on two opposite sides of the liquid storage bottle, and two reference electrodes are also provided and located on two opposite sides of the liquid storage bottle.

[0009] Preferably, in the circumferential direction of the liquid storage bottle, the two liquid level detection electrodes correspond to the two reference electrodes one by one and are aligned in position, and the two liquid level detection electrodes and the two reference electrodes are both rectangular extending in the liquid level height direction.

[0010] Preferably, the width of one liquid level detection electrode is a positive integer multiple of the width of another liquid level detection electrode; and the width of one reference electrode is a positive integer multiple of the width of another reference electrode.

[0011] Preferably, in the liquid level height direction, the length of the liquid level detection electrode is a positive integer multiple of the length of the reference electrode; and / or

[0012] In the circumferential direction of the liquid storage bottle, the width of the reference electrode is a positive integer multiple of the width of the liquid level detection electrode.

[0013] Preferably, the aroma diffusion device further comprises a shell, the atomization device is connected to the shell, a receiving cavity is provided on the shell, and the liquid storage bottle is located in the receiving cavity.

[0014] The liquid level detection electrode and the reference electrode are mounted on the inner wall of the accommodating cavity, the controller is arranged in the shell, and is spaced 0.1mm-20mm, preferably 1mm-5mm, from the outer wall of the liquid storage bottle; or the liquid storage bottle is detachable relative to the accommodating cavity, the liquid level detection electrode and the reference electrode are mounted on the outer wall of the liquid storage bottle, the controller is arranged in the shell, the outer wall of the liquid storage bottle is also provided with contacts electrically connected to the liquid level detection electrode and the reference electrode, the inner wall of the accommodating cavity is provided with contacts electrically connected to the controller, and when the liquid storage bottle is placed in the accommodating cavity, the contacts on the liquid storage bottle are in contact with the contacts on the inner wall of the accommodating cavity.

[0015] Preferably, the aroma diffusion device also includes a shell, the atomization device is connected to the shell, a main control circuit board is arranged in the shell, a accommodating cavity is arranged on the shell, the liquid storage bottle is located in the accommodating cavity, the aroma diffusion device also includes a liquid level detection circuit board, the liquid level detection circuit board is installed on the outer wall of the liquid storage bottle, the liquid level detection electrode and the reference electrode are connected to the liquid level detection circuit board, and the liquid level detection electrode and the reference electrode are located on the inner side of the liquid level detection circuit board facing the liquid storage bottle, the controller is also installed on the liquid level detection circuit board, and the liquid level detection circuit board is electrically connected to the main control circuit board.

[0016] Preferably, the liquid level detection electrode and the reference electrode are formed on the inner side of the liquid level detection circuit board by etching, and a metal shielding layer is formed on the outer side of the liquid level detection circuit board facing away from the liquid storage bottle.

[0017] Preferably, when detecting the liquid level height, the frequency change Cex of the current reference electrode and the frequency change Cey of the current liquid level detection electrode are determined; the current frequency change ratio Cc is determined by Cc=Cey / Cex; the current liquid level height H is determined by Cc=H*K, where K is a coefficient; Cex=Ceb-Cea, where Ceb is the current frequency of the reference electrode and Cea is the no-load frequency of the reference electrode; Cey=Ced-Cec, where Ced is the current frequency of the liquid level detection electrode and Cec is the no-load frequency of the liquid level detection electrode.

[0018] The frequency change Cex of the reference electrode is the difference between the current frequency of the reference electrode and the no-load frequency of the reference electrode; the frequency change Cey of the liquid level detection electrode is the difference between the current frequency of the liquid level detection electrode and the no-load frequency of the liquid level detection electrode.

[0019] Compared with the prior art, the beneficial effects of the aroma diffusion device described in the present invention are mainly reflected in: the liquid level is detected by the reference electrode and the liquid level detection electrode, and the liquid level detection electrode extends along the liquid level height direction, so that any liquid level height of the liquid storage bottle can be measured.

[0020] By setting two liquid level detection electrodes and two reference electrodes, the accuracy of data acquisition is improved. The height of the liquid level detection electrode and the reference electrode is a positive integer multiple, and the liquid level height can be accurately determined according to the proportional relationship between the liquid level detection electrode and the reference electrode.

[0021] At the same time, the liquid level detection electrode and the reference electrode are distributed along the height direction of the liquid storage bottle; so that the electrodes on the liquid storage bottle are arranged in a split type; this can avoid the electrode length being too large, and avoid the increase in error caused by the excessive capacitance difference value due to the excessive electrode area; by setting distributed electrodes, the area of ​​each electrode is reduced, thereby reducing the error.

[0022] Compared with the prior art, the beneficial effects of the aroma diffusion device described in the present invention are mainly reflected in: the frequency change of the liquid level detection electrode and the frequency change of the reference electrode reflect the change of the liquid level height; the liquid level height is determined by the frequency change, which is suitable for height detection of different liquid levels. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The above and other purposes, features and advantages of the present invention will become more clear by more specific description of the preferred embodiments of the present invention shown in the accompanying drawings. The same reference numerals indicate the same parts in all the accompanying drawings, and the accompanying drawings are not deliberately scaled to the actual size, and the focus is on illustrating the main purpose of the present invention.

[0024] Figure 1 It is a schematic diagram of implementing one of the present invention.

[0025] Figure 2This is a schematic diagram of the alignment of the liquid level detection electrode and the reference electrode in the present invention.

[0026] Figure 3 It is a schematic diagram of the staggered arrangement of the liquid level detection electrode and the reference electrode in the present invention.

[0027] Figure 4 It is a schematic diagram of the second embodiment of the present invention.

[0028] Figure 5 This is a schematic diagram of Embodiment 3 of the present invention.

[0029] Figure 6 It is a schematic diagram of Embodiment 4 of the present invention.

[0030] Figure 7 This is a comparison diagram of the prior art using only one set of test electrodes to detect the liquid level.

[0031] Figure 8 This is a comparison diagram of using a reference electrode and a liquid level detection electrode to detect liquid level in the present invention.

[0032] Description of the drawings: liquid storage bottle 1, liquid level detection electrode 2, reference electrode 3, controller 4, atomization device 5, shell 6, accommodating cavity 61, main control circuit board 62, contact 7, liquid level detection circuit board 8. DETAILED DESCRIPTION

[0033] The technical solution of the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments, so that those skilled in the art can better understand the present invention and implement it. However, the embodiments cited are not intended to limit the present invention. In the present embodiment, it should be understood that the orientations or positional relationships indicated by terms such as "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", and "outside" are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention.

[0034] It should be noted that when an element is considered to be "connected" to another element, it may be directly connected to the other element and integrated therewith, or there may be an intermediate element at the same time. The terms "installed", "one end", "the other end" and similar expressions used in the present invention are for illustrative purposes only.

[0035] Embodiment 1

[0036] A fragrance diffusion device, such as Figure 1-2As shown, it includes an atomizing device (not shown in the figure) and a liquid storage bottle 1 connected to the atomizing device, the liquid storage bottle 1 is made of insulating material, the atomizing device is used to atomize the liquid in the liquid storage bottle 1 and diffuse it outward, the fragrance diffusion device also includes a liquid level detection electrode 2, a reference electrode 3 and a controller (not shown in the figure) electrically connected to the liquid level detection electrode 2 and the reference electrode 3, the liquid level detection electrode 2 and the reference electrode 3 are arranged on the outer wall of the liquid storage bottle 1, the liquid level detection electrode 2 extends along the liquid level height direction, the reference electrode 3 is at least provided with one and is adjacent to the bottom of the liquid storage bottle 1, and the controller 4 calculates the liquid level height in the liquid storage bottle according to the detection signals of the liquid level detection electrode 2 and the reference electrode 3.

[0037] The liquid level is detected by the reference electrode 3 and the liquid level detection electrode 2 . The liquid level detection electrode 2 extends along the liquid level height direction, so that any liquid level height of the liquid storage bottle 1 can be measured.

[0038] The reference electrode 3 and the liquid level detection electrode 2 are both non-contact capacitive sensors, and the reference electrode 3 and the liquid level detection electrode 2 are pasted on the outer wall of the liquid storage bottle 1 for use; when the liquid level changes, the frequency of the electrode changes.

[0039] In a preferred embodiment, one end of the reference electrode 3 is flush with the bottom of the liquid storage bottle 1, and one end of the liquid level detection electrode 2 is flush with the top of the liquid storage bottle 1; this can accurately detect the liquid level from the bottom to the top of the liquid storage bottle 1.

[0040] The liquid level detection electrode 2 and the reference electrode 3 are distributed along the height direction of the liquid storage bottle 1, so that the electrodes on the liquid storage bottle 1 are arranged in a split type. This can avoid the electrode length being too large and the increase in error caused by the electrode area being too large. By setting distributed electrodes, the area of ​​each electrode is reduced, thereby reducing the error.

[0041] When detecting the liquid level height, the current liquid level height is determined by the frequency change of the liquid level detection electrode 2 and the frequency change of the reference electrode 3; the current frequency change ratio Cc is determined by the ratio of the frequency change Cey of the liquid level detection electrode 2 and the frequency change Cex of the reference electrode 3, and the corresponding liquid level height is determined by the current frequency change ratio Cc, Cc=Cey / Cex.

[0042] A plurality of liquid level detection electrodes 2 are provided, and in the liquid level height direction, the liquid level detection electrode 2 is located above the reference electrode 3 .

[0043] Two liquid level detection electrodes 2 are provided, located on opposite sides of the liquid storage bottle 1, and two reference electrodes 3 are provided, also located on opposite sides of the liquid storage bottle 1. By providing two liquid level detection electrodes 2 and two reference electrodes 3, the accuracy of data acquisition is improved. The height of the liquid level detection electrode 2 and the reference electrode 3 are positive integer multiples, and the liquid level height can be accurately determined according to the proportional relationship between the liquid level detection electrode 2 and the reference electrode 3.

[0044] In the circumferential direction of the liquid storage bottle 1, the two liquid level detection electrodes 2 correspond to the two reference electrodes 3 one by one and are aligned in position, and the two liquid level detection electrodes 2 and the two reference electrodes 3 are both rectangular extending along the liquid level height direction.

[0045] Reference Figure 3 As shown, in another embodiment, in the circumferential direction of the liquid storage bottle 1, the two liquid level detection electrodes 2 are respectively staggered with the two reference electrodes 3.

[0046] In the liquid level height direction, the length of the liquid level detection electrode 2 is a positive integer multiple of the length of the reference electrode 3 ; in a preferred embodiment, the length of the liquid level detection electrode 2 is twice the length of the reference electrode 3 .

[0047] In the circumferential direction of the liquid storage bottle, the width of the reference electrode 3 is a positive integer multiple of the width of the liquid level detection electrode 2 ; in a preferred embodiment, the width of the liquid level detection electrode 2 is 1 times the width of the reference electrode 3 .

[0048] The width of one liquid level detection electrode 2 is a positive integer multiple of the width of the other liquid level detection electrode 2; the width of one reference electrode 3 is a positive integer multiple of the width of the other reference electrode 3. In a preferred embodiment, the width of one liquid level detection electrode 2 is 1 times the width of the other liquid level detection electrode 2, and the widths of the two liquid level detection electrodes 2 are equal; the width of one reference electrode 3 is 1 times the width of the other reference electrode 3, and the widths of the two reference electrodes 3 are equal.

[0049] The method for detecting the liquid level comprises the following steps:

[0050] S1, pre-install reference electrode 3 and liquid level detection electrode 2.

[0051] S2. Preset linear relationship data Cc=H*K between frequency change ratio and liquid level height; Cc is frequency change ratio; H is liquid level height; K is coefficient; in this embodiment, coefficient K is a preset value.

[0052] S3. Collect the frequency change Cex of the current reference electrode 3.

[0053] S4, collecting the frequency change Cey of the current liquid level detection electrode 2.

[0054] S5. Determine the current frequency change ratio Cc through Cc=Cey / Cex, and determine the corresponding liquid level height through the current frequency change ratio Cc.

[0055] In the above method, when the liquid level in the liquid storage bottle 1 changes, the frequency change of the reference electrode 3 and the frequency change of the liquid level detection electrode 2 will also change, and then the frequency change ratio between the frequency change of the reference electrode 3 and the frequency change of the liquid level detection electrode 2 will also change; when the liquid storage bottle 1 is fully loaded, the frequency change ratio is the largest, and as the liquid level decreases, the frequency change ratio gradually decreases; the change in liquid level height is reflected by the frequency change ratio; at the same time, since the frequencies of the electrodes are inconsistent when detecting different liquids; the liquid level height is determined by the frequency change; it is suitable for height detection of different liquid levels.

[0056] In the above method, collecting the frequency change Cex of the current reference electrode 3 in S3 specifically includes the following steps:

[0057] S3.1. Preset the no-load frequency Cea of ​​the reference electrode. The no-load frequency Cea of ​​the reference electrode is the frequency corresponding to when the liquid storage bottle 1 is no-load.

[0058] S3.2, obtaining the current frequency Ceb of the reference electrode. Specifically, the frequencies of the two reference electrodes are obtained respectively, and then the average frequency of the two reference electrodes is set as the current frequency Ceb of the reference electrode.

[0059] In this embodiment, the frequency Ce1 of a reference electrode is first obtained; then the frequency Ce2 ​​of another reference electrode is obtained; the average frequency of the two reference electrodes is calculated by (Ce1+Ce2) / 2; then the average frequency of the two reference electrodes is set as the current frequency Ceb of the reference electrode; the frequency obtained in this way has good accuracy.

[0060] S3.3. Determine the frequency change Cex of the current reference electrode 3 by subtracting the no-load frequency Cea of ​​the reference electrode from the current frequency Ceb of the reference electrode; Ceb-Cea=Cex.

[0061] In the above method, the frequency change Cey of the current liquid level detection electrode 2 is collected in S4, which specifically includes the following steps:

[0062] S4.1. Preset the no-load frequency Cec of the liquid level detection electrode 2. The no-load frequency Cec of the liquid level detection electrode 2 is the frequency corresponding to when the liquid storage bottle 1 is no-load.

[0063] S4.2, obtaining the current frequency Ced of the liquid level detection electrode 2. Specifically, respectively obtain the frequencies of the two liquid level detection electrodes 2, and then set the average frequency of the two liquid level detection electrodes 2 as the current frequency Ced of the liquid level detection electrode 2.

[0064] In this embodiment, the frequency Ce3 of one liquid level detection electrode 2 is first obtained; then the frequency Ce4 of the other liquid level detection electrode 2 is obtained; the average frequency of the two liquid level detection electrodes 2 is calculated by (Ce3+Ce4) / 2; then the average frequency of the two liquid level detection electrodes 2 is set as the current frequency Ced of the liquid level detection electrode 2; the frequency obtained in this way has good accuracy.

[0065] S4.3. Determine the current frequency change Cey of the liquid level detection electrode 2 by subtracting the no-load frequency Cec of the liquid level detection electrode 2 from the current frequency Ced of the liquid level detection electrode 2; Ced-Cec=Cey.

[0066] The following data is used to illustrate

[0067] Table 1 is a data table showing the frequency change ratio of liquid M1 corresponding to the liquid level height.

[0068]

[0069] Table 1

[0070] Take Table 1 as an example; as the liquid level decreases, the frequency change ratio will gradually decrease.

[0071] Table 2 is a data table showing the frequency change ratio of liquid M2 corresponding to the liquid level height.

[0072]

[0073]

[0074] Table 2

[0075] Take Table 2 as an example; as the liquid level decreases, the frequency change ratio will gradually decrease.

[0076] Table 3 is a data table showing the frequency change ratio of liquid M3 corresponding to the liquid level height.

[0077]

[0078] Table 3

[0079] Take Table 3 as an example; as the liquid level decreases, the frequency change ratio will gradually decrease.

[0080] Refer to Table 1, Table 2, Table 3, Figure 7 and Figure 8As shown; the frequency change ratios of the liquid level detection electrodes 2 of different types of liquids are inconsistent; the present invention determines the liquid level height by the frequency change ratio, and is suitable for height detection of different liquid levels.

[0081] Embodiment 2.

[0082] A fragrance diffusion device, such as Figure 4 As shown, it includes a shell 6, an atomizing device 5 and a liquid storage bottle 1 connected to the atomizing device 5, the atomizing device 5 is connected to the shell 6, the shell 6 is provided with a accommodating cavity 61, and the liquid storage bottle 1 is fixedly arranged in the accommodating cavity 61; the controller 4 is arranged in the shell 6, and is spaced 0.1mm-20mm from the outer wall of the liquid storage bottle 1, preferably 1mm-5mm; the liquid level detection electrode 2 and the reference electrode 3 are arranged on the inner wall of the accommodating cavity 61 of the liquid storage bottle 1. In this embodiment, the liquid level detection electrode 2 and the reference electrode 3 are connected to the controller 4 through leads to realize signal transmission; the remaining structure is the same as that of the first embodiment.

[0083] Embodiment 3

[0084] A fragrance diffusion device, such as Figure 5 As shown, it includes a shell 6, an atomizing device 5 and a liquid storage bottle 1 connected to the atomizing device 5, the atomizing device 5 is connected to the shell 6, a receiving cavity 61 is provided on the shell 6, and the liquid storage bottle 1 is located in the receiving cavity 61; the liquid storage bottle 1 is detachably arranged in the receiving cavity 61; the controller 4 is arranged in the shell 6; the outer wall of the liquid storage bottle 1 is also provided with a contact 7 electrically connected to the liquid level detection electrode 2 and the reference electrode 3, the inner wall of the receiving cavity 61 is provided with a contact 7 electrically connected to the controller 4, when the liquid storage bottle 1 is placed in the receiving cavity 61, the contact 7 on the liquid storage bottle 1 contacts the contact 7 on the inner wall of the receiving cavity 61; the contact 7 on the liquid storage bottle 1 contacts the contact 7 on the inner wall of the receiving cavity 61, so that the signal connection between the liquid level detection electrode 2, the reference electrode 3 and the controller 4 is realized; the rest of the structure is the same as that of the first embodiment.

[0085] Embodiment 4.

[0086] A fragrance diffusion device, such as Figure 6 As shown, it includes a shell 6, an atomization device 5 and a liquid storage bottle 1 connected to the atomization device 5, the atomization device 5 is connected to the shell 6, a receiving cavity 61 is provided on the shell 6, the liquid storage bottle 1 is located in the receiving cavity 61, and the liquid storage bottle 1 is detachably arranged in the receiving cavity 61.

[0087] A main control circuit board 62 is arranged in the shell 6, and a accommodating cavity 61 is arranged on the shell 6. The liquid storage bottle 1 is located in the accommodating cavity 61. The fragrance diffusion device also includes a liquid level detection circuit board 8, and the liquid level detection circuit board 8 is installed on the outer wall of the liquid storage bottle 1. The liquid level detection electrode 2 and the reference electrode 3 are connected to the liquid level detection circuit board 8, and the liquid level detection electrode 2 and the reference electrode 3 are located on the inner side of the liquid level detection circuit board 8 facing the liquid storage bottle 1. The controller is also installed on the liquid level detection circuit board 8, and the liquid level detection circuit board 8 is electrically connected to the main control circuit board 62.

[0088] The liquid level detection electrode 2 and the reference electrode 3 are formed on the inner side of the liquid level detection circuit board 8 by etching, and a metal shielding layer is formed on the outer side of the liquid level detection circuit board 8 facing away from the liquid storage bottle 1; the rest of the structure is the same as that of the first embodiment.

[0089] In this specification, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0090] In the description of this specification, the description with reference to the terms "preferred embodiment", "further embodiment", "other embodiments" or "specific example" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

[0091] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A fragrance diffusion device, comprising an atomizing device and a liquid storage bottle connected to the atomizing device, wherein the liquid storage bottle is made of insulating material, and the atomizing device is used to atomize the liquid in the liquid storage bottle and diffuse it outward, characterized in that: The aroma diffusion device also includes a liquid level detection electrode, a reference electrode and a controller electrically connected to the liquid level detection electrode and the reference electrode. The liquid level detection electrode and the reference electrode are arranged on the outer wall of the liquid storage bottle or are located outside the liquid storage bottle and are spaced 0.1mm-20mm from the outer wall of the liquid storage bottle. The liquid level detection electrode extends along the liquid level height direction. At least one reference electrode is arranged and is adjacent to the bottom of the liquid storage bottle. The controller calculates the liquid level height in the liquid storage bottle based on the detection signals of the liquid level detection electrode and the reference electrode.

2. The aroma diffusion device according to claim 1, characterized in that: A plurality of liquid level detection electrodes are provided, and in the liquid level height direction, the liquid level detection electrodes are located above the reference electrode.

3. The aroma diffusion device according to claim 2, characterized in that: Two liquid level detection electrodes are provided and located at two opposite sides of the liquid storage bottle. Two reference electrodes are also provided and located at two opposite sides of the liquid storage bottle.

4. The aroma diffusion device according to claim 3, characterized in that: In the circumferential direction of the liquid storage bottle, the two liquid level detection electrodes correspond to the two reference electrodes one by one and are aligned in position, and the two liquid level detection electrodes and the two reference electrodes are both rectangular extending in the liquid level height direction.

5. The aroma diffusion device according to claim 3, characterized in that: The width of one liquid level detection electrode is a positive integer multiple of the width of another liquid level detection electrode; the width of one reference electrode is a positive integer multiple of the width of another reference electrode.

6. The aroma diffusion device according to claim 1, characterized in that: In the liquid level height direction, the length of the liquid level detection electrode is a positive integer multiple of the length of the reference electrode; and / or In the circumferential direction of the liquid storage bottle, the width of the reference electrode is a positive integer multiple of the width of the liquid level detection electrode.

7. The aroma diffusion device according to any one of claims 1 to 6, characterized in that: The aroma diffusion device further comprises a housing, the atomizing device is connected to the housing, a receiving cavity is provided on the housing, and the liquid storage bottle is located in the receiving cavity; The liquid level detection electrode and the reference electrode are mounted on the inner wall of the accommodating cavity, the controller is arranged in the shell, and is spaced 0.1mm-20mm, preferably 1mm-5mm, from the outer wall of the liquid storage bottle; or the liquid storage bottle is detachable relative to the accommodating cavity, the liquid level detection electrode and the reference electrode are mounted on the outer wall of the liquid storage bottle, the controller is arranged in the shell, the outer wall of the liquid storage bottle is also provided with contacts electrically connected to the liquid level detection electrode and the reference electrode, the inner wall of the accommodating cavity is provided with contacts electrically connected to the controller, and when the liquid storage bottle is placed in the accommodating cavity, the contacts on the liquid storage bottle are in contact with the contacts on the inner wall of the accommodating cavity.

8. The aroma diffusion device according to any one of claims 1 to 6, characterized in that: The aroma diffusion device also includes a shell, the atomization device is connected to the shell, a main control circuit board is arranged in the shell, a accommodating cavity is arranged on the shell, the liquid storage bottle is located in the accommodating cavity, the aroma diffusion device also includes a liquid level detection circuit board, the liquid level detection circuit board is installed on the outer wall of the liquid storage bottle, the liquid level detection electrode and the reference electrode are connected to the liquid level detection circuit board, and the liquid level detection electrode and the reference electrode are located on the inner side of the liquid level detection circuit board facing the liquid storage bottle, the controller is also installed on the liquid level detection circuit board, and the liquid level detection circuit board is electrically connected to the main control circuit board.

9. The aroma diffusion device according to claim 8, characterized in that: The liquid level detection electrode and the reference electrode are formed on the inner side of the liquid level detection circuit board by etching, and a metal shielding layer is formed on the outer side of the liquid level detection circuit board facing away from the liquid storage bottle.

10. The aroma diffusion device according to claim 1, characterized in that: When detecting the liquid level height, determine the frequency change Cex of the current reference electrode and the frequency change Cey of the current liquid level detection electrode; determine the current frequency change ratio Cc through Cc=Cey / Cex; determine the current liquid level height H through Cc=H*K, where K is the coefficient; Cex=Ceb-Cea, where Ceb is the current frequency of the reference electrode and Cea is the no-load frequency of the reference electrode; Cey=Ced-Cec, where Ced is the current frequency of the liquid level detection electrode and Cec is the no-load frequency of the liquid level detection electrode.

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