Capacitive liquid level sensor

Abstract

The capacitive liquid level sensor comprises a measuring probe, the measuring probe comprises an outer pipe and at least one measuring electrode, the outer pipe is provided with a closed end and a mounting end, and the measuring electrode is arranged in the outer pipe; and the control circuit board is electrically connected with the measuring electrode. Compared with the prior art, the mode that an outer pipe and an inner pipe serve as two electrodes in the prior art is abandoned, the measuring electrode is innovatively used for measuring the liquid level of the measured liquid outside the outer pipe, the liquid level of the measured liquid can be measured without entering the measuring cavity, and the liquid level can be rapidly measured.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of liquid level sensor, specifically relates to a capacitive liquid level sensor. BACKGROUND

[0002] The capacitive liquid level sensor is a device for measuring liquid level by using the principle that the change of the measured medium surface causes the change of the capacitance. The current capacitive liquid level sensor mainly uses two inner and outer pipes as two electrodes of the capacitor, and the liquid entering the measuring cavity between the inner and outer pipes is equivalent to the medium between the two plates. When the height of the measured liquid submerges the measuring electrode changes, the capacitance changes, and then the change of the medium height is converted into a standard electrical signal and displayed.

[0003] However, the above-mentioned capacitive liquid level sensor, the measured liquid is through the liquid inlet hole at the bottom of the outer pipe to enter and exit the measuring cavity between the inner and outer pipes, the liquid inlet and outlet speed is slow, especially when measuring some high concentration liquid, the liquid inlet hole is easy to be blocked, and the liquid is easy to hang on the wall of the measuring cavity, the height of the liquid in the measuring cavity is inconsistent with the height of the liquid outside the measuring cavity. UTILITY MODEL CONTENT

[0004] In order to overcome the above technical defects, the utility model provides a capacitive liquid level sensor, which can solve the technical problem that the capacitive liquid level sensor in the prior art cannot quickly measure the liquid level.

[0005] The utility model is realized according to the following technical scheme:

[0006] The utility model provides a capacitive liquid level sensor, which comprises:

[0007] The measuring probe comprises an outer pipe and at least one measuring pole, the outer pipe has a closed end and a mounting end, and the measuring pole is arranged in the outer pipe.

[0008] The control circuit board is electrically connected with the measuring pole.

[0009] Compared with the prior art, the application discards the mode that the outer pipe and the inner pipe are used as two electrodes in the prior art, and innovatively uses the measuring pole to measure the liquid level of the measured liquid outside the outer pipe, so that the measured liquid can be measured without entering the measuring cavity, and the liquid level is quickly measured.

[0010] In one embodiment, the number of measuring poles is multiple, and the multiple measuring poles are arranged in the length direction of the outer pipe.

[0011] In one embodiment, each measuring pole is electrically connected with the control circuit board through an independent wire, and the multiple wires are insulated.

[0012] In an embodiment, the outer tube is made of insulating material, and the measuring probe is made of conductive material.

[0013] In an embodiment, the outer tube is encapsulated with epoxy resin.

[0014] In an embodiment, the closed end is provided with a closure.

[0015] In an embodiment, the measuring probe further comprises an inner tube, which is arranged in the outer tube.

[0016] The outer side of the inner tube is provided with the measuring probe.

[0017] In an embodiment, the measuring probe is a ring structure, and the measuring probe is sleeved on the outer side of the inner tube.

[0018] In an embodiment, the capacitive liquid level sensor further comprises a housing, and the control circuit board is arranged in the housing; and the housing is connected with the mounting end.

[0019] In an embodiment, the housing is provided with a mounting structure, and the mounting structure comprises one of a threaded segment, a buckle segment, and a screw buckle segment. BRIEF DESCRIPTION OF DRAWINGS

[0020] The specific embodiments of the utility model will be further described in detail below with reference to the drawings, in which:

[0021] Figure 1 It is a perspective view of the capacitive liquid level sensor of embodiment 1 of the utility model;

[0022] Figure 2 It is a sectional view of the capacitive liquid level sensor of embodiment 1 of the utility model;

[0023] Figure 3 It is a sectional view of the capacitive liquid level sensor of embodiment 2 of the utility model;

[0024] Figure 4 It is a perspective view of the capacitive liquid level sensor of embodiment 3 of the utility model; (omit the outer tube)

[0025] Figure 5 It is a sectional view of the capacitive liquid level sensor of embodiment 3 of the utility model.

[0026] BRIEF DESCRIPTION OF DRAWINGS

[0027] 10 measuring probe, 110 outer tube, 111 closed end, 112 mounting end, 120 measuring probe, 130 inner tube, 20 control circuit board, 30 housing, 310 mounting structure, 40 epoxy resin, 50 closure, 60 signal line DETAILED DESCRIPTION

[0028] The preferred embodiments of the present application will be described below with reference to the drawings. It should be understood that the preferred embodiments described herein are merely intended to illustrate and explain the present application, and are not intended to limit the present application.

[0029] In order to better illustrate the present application, the present application will be further described below with reference to the drawings.

[0030] It should be clear that the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present application.

[0031] The terms used in the present application are only for the purpose of describing specific embodiments, and are not intended to limit the present application. The singular forms "a", "an" and "the" used in the present application and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise. It should also be understood that the term "and / or" used herein means and includes any or all possible combinations of one or more associated listed items.

[0032] The following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of the present application, as detailed in the appended claims. In the description of the present application, it should be understood that the terms "first", "second", "third", etc. are only used to distinguish similar objects, and do not necessarily describe a specific order or sequence, nor can they be understood as indicating or implying relative importance. For those of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0033] In addition, in the description of the present application, "a plurality of" means two or more, unless otherwise specified. The association between the associated objects is described as "and / or", which means that there can be three relationships, for example, A and / or B can mean that A exists alone, A and B exist together, and B exists alone. The character " / " generally represents a "or" relationship between the associated objects before and after it.

[0034] Example 1

[0035] In combination Figures 1 to 2As shown, the embodiment provides a capacitive liquid level sensor, which comprises a measurement probe 10, the measurement probe 10 comprises an outer tube 110 and at least one measurement pole 120, the outer tube 110 has a closed end 111 and a mounting end 112, the measurement pole 120 is arranged in the outer tube 110; a control circuit board 20 electrically connected with the measurement pole 120.

[0036] Specifically, by placing the measurement probe 10 into the container where the measured liquid is located, the closed end 111 is located at one end of the outer tube 110 close to the measured liquid, and the mounting end 112 is located at one end of the outer tube 110 away from the measured liquid, so that Figure 1 For illustration, the closed end 111 is the lower end, and the mounting end 112 is the upper end. The stray capacitance in the air can be coupled into the measured liquid. When the measured liquid is immersed to the position of the measurement pole 120, the measurement pole 120 can transmit the detected capacitance through the outer tube 110 to the chip of the control circuit board 20 through the wire, and the chip can sense the change of the capacitance through the related circuit and program, so as to know whether the measurement probe 10 is in contact with the measured liquid, so as to know the current liquid level of the measured liquid.

[0037] Compared with the prior art, the application discards the way of taking the outer tube 110 and the inner tube 130 as two electrodes in the prior art, and innovatively uses the measurement pole 120 to measure the liquid level of the measured liquid outside the outer tube 110, so that the measured liquid can be measured without entering the measurement cavity, and the liquid level is measured quickly.

[0038] In the embodiment, the number of the measurement poles 120 is multiple, and the multiple measurement poles 120 are arranged in the length direction of the outer tube 110. The embodiment measures multiple liquid levels of the measured liquid in the container by arranging multiple measurement poles 120.

[0039] In the embodiment, each measurement pole 120 is electrically connected with the control circuit board 20 through an independent wire, and the multiple wires are insulated from each other. When multiple liquid levels need to be detected, multiple measurement poles 120 are correspondingly increased. The measurement poles 120 are electrically connected with the control circuit board 20 through independent wires, and the multiple wires are insulated from each other, so as to avoid affecting the detection result.

[0040] In the embodiment, the outer tube 110 is made of insulating material, and the measurement pole 120 is made of conductive material.

[0041] In the embodiment, the outer tube 110 is encapsulated with the epoxy resin 40. The embodiment avoids the measured liquid from entering the outer tube 110 when measuring the liquid level of the measured liquid by filling the outer tube 110 with the epoxy resin 40 and curing the epoxy resin 40. Moreover, the epoxy resin 40 can enhance the structural strength of the outer tube 110 after curing, preventing the outer tube 110 from deforming or breaking.

[0042] Preferably, the color of the epoxy resin 40 is opaque, so as to hide the internal structure and components of the measurement probe 10, and to avoid being easily imitated by others while being beautiful.

[0043] It should be noted that, for the convenience of understanding the drawings, Figure 2 The cross-sectional line of the epoxy resin is not shown in the embodiment.

[0044] In the embodiment, the capacitive liquid level sensor further comprises a housing 30, and the control circuit board 20 is arranged in the housing 30. The housing 30 is connected with the mounting end 112, and the control circuit board 20 is protected by the housing 30. The lead wire of the measurement electrode 120 can be connected with the control circuit board 20 through the mounting end 112.

[0045] Further, the housing 30 is provided with a mounting structure 310, which is used to be mounted and connected with a container containing the measured liquid. The mounting structure 310 comprises one of a threaded section, a buckle section or a screw buckle section, and the housing 30 can be provided with one of the threaded section, the buckle section or the screw buckle section on the surface of the housing 30 according to actual needs.

[0046] Preferably, the shape of the outer tube 110 in the embodiment is a circular tube. In other embodiments, the shape of the outer tube 110 can also be a square tube or a triangular tube, which is not limited in the application.

[0047] Embodiment 2

[0048] Combined with Figure 3 the drawings, the embodiment is basically the same as embodiment 1, and the difference lies in that the way of forming the closed end 111 in the embodiment is different from that in embodiment 1. In the embodiment, the closed end 111 is provided with a closure 50, which is used to block the closed end 111 of the outer tube 110, so that the space in the outer tube 110 is isolated from the space outside the outer tube 110 (the space in the container), avoiding the measured liquid from entering the outer tube 110 and affecting the measurement result.

[0049] Embodiment 3

[0050] Combined with Figures 4 to 5As shown, the embodiment is basically the same as that of the embodiment 1, except that, in order to facilitate the installation of the measuring pole 120, the measuring probe 10 of the embodiment further comprises an inner tube 130, which is arranged in the outer tube 110; the outer side of the inner tube 130 is provided with the measuring pole 120. The embodiment facilitates the installation of the measuring pole 120 by prearranging the measuring pole 120 on the outer side of the inner tube 130, and then sleeving the outer tube 110 on the outer side of the inner tube 130, and by means of the inner tube 130 as an installation carrier.

[0051] Further, the measuring pole 120 is in a ring structure, and the measuring pole 120 is sleeved on the outer side of the inner tube 130.

[0052] According to the disclosure and teaching of the above description, the skilled in the art of the utility model can also change and modify the above-mentioned embodiments. Therefore, the utility model is not limited to the specific embodiments disclosed and described above, and some modifications and changes of the utility model should also fall within the protection scope of the claims of the utility model. In addition, although some specific terms are used in the specification, these terms are only for convenience of description and do not constitute any limitation on the utility model.

Claims

1. A capacitive liquid level sensor, characterized by The utility model relates to a capacitive liquid level sensor, which comprises a measuring probe and a control circuit board. The measuring probe comprises an outer tube and at least one measuring electrode, the outer tube having a closed end and a mounting end, and the measuring electrode being arranged in the outer tube. The control circuit board is electrically connected with the measuring electrode.

2. The capacitive liquid level sensor according to claim 1, wherein: a plurality of measuring electrodes are arranged along the length direction of the outer tube.

3. The capacitive liquid level sensor according to claim 2, wherein: each measuring electrode is electrically connected with the control circuit board through an independent wire, and the wires are insulated from each other.

4. The capacitive liquid level sensor according to claim 1, wherein: the outer tube is made of insulating material, and the measuring electrode is made of conductive material.

5. The capacitive liquid level sensor according to claim 1, wherein: the outer tube is encapsulated with epoxy resin.

6. The capacitive liquid level sensor according to claim 1, wherein: the closed end is provided with a closure.

7. The capacitive liquid level sensor according to claim 5 or 6, wherein: the measuring probe further comprises an inner tube arranged in the outer tube, and the measuring electrode is arranged on the outer side of the inner tube.

8. The capacitive liquid level sensor according to claim 7, wherein: the measuring electrode is in a ring structure, and the measuring electrode is sleeved on the outer side of the inner tube.

9. The capacitive liquid level sensor according to claim 1, wherein: the capacitive liquid level sensor further comprises a housing, the control circuit board being arranged in the housing, and the housing is connected with the mounting end.

10. The capacitive liquid level sensor according to claim 9, wherein: the housing is provided with a mounting structure, and the mounting structure comprises one of a threaded segment, a buckle segment or a screw buckle segment. ​

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