Non-contact flexible capacitance liquid level sensor

Abstract

The utility model relates to the technical field of liquid level sensors, in particular to a non-contact flexible capacitance liquid level sensor which comprises an inductor and a fixing support, foot pads are arranged at four corners of the bottom of the fixing support, patches are adhered to the bottoms of the foot pads, the patches are adhered to the surface of a container, the bottom of the inductor is connected with a connecting rod, and the connecting rod is connected with the fixing support. The connecting rod penetrates through the fixing support and is connected with an induction patch, the induction patch makes contact with the surface of a container, the induction patch is electrically connected with the inductor through a wire, non-contact liquid level monitoring of the liquid level is achieved through the non-contact type flexible capacitance liquid level sensor, the influence of high temperature on the sensor is reduced, and the service life is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of liquid level sensors, in particular to a non-contact flexible capacitive liquid level sensor. Background Technique

[0002] The working principle of the patch-type capacitive liquid level sensor is to use the inductive capacitance of water to detect whether there is liquid. When there is no liquid approaching the sensor, due to the existence of distributed capacitance on the sensor, there is a certain static capacitance between the sensor and the ground. When the liquid level slowly rises and approaches the sensor, the parasitic capacitance of the liquid will be coupled to this static capacitance, making the final capacitance value of the sensor increase. This changed capacitance signal is then input to the control IC for signal conversion, converting the changed capacitance into a change in a certain electrical signal, and then using a certain algorithm to detect and judge the degree of this change. When this change exceeds a certain threshold, it is considered that the liquid level has reached the sensing point. For example, a Chinese patent for an externally attached pipeline liquid level sensor, with the patent number (CN 205748545U), which is externally attached to the surface of the container pipeline and connected to an external intelligent terminal through a flexible wire to achieve the function of non-contact flexible liquid level sensing. However, it is closely attached to the surface of the container pipeline, and high-temperature solutions flow inside the surface of some container pipelines. The excessive temperature has an adverse effect on its capacitor and causes damage after long-term use. Content of the Utility Model

[0003] The purpose of the utility model is to solve the deficiencies existing in the prior art, and a non-contact flexible capacitive liquid level sensor is proposed.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] Design a non-contact flexible capacitive liquid level sensor, including a sensor and a fixed bracket. At the four corners of the bottom of the fixed bracket, there are pad feet, and patches are bonded to the bottoms of the pad feet. The patches are bonded to the surface of the container. The bottom of the sensor is connected to a connecting rod, the connecting rod passes through the fixed bracket and is connected to an induction patch, the induction patch is in contact with the surface of the container, and the induction patch is electrically connected to the sensor through a wire.

[0006] Preferably, the outer wall of the sensor is wrapped with a hard shell, and the surface of the hard shell is coated with a heat-insulating rubber sleeve.

[0007] Preferably, a fixed seat is fixedly connected to the upper end surface of the fixed bracket, the connecting rod passes through the fixed seat, and a spring is sleeved on the outer wall of the connecting rod. The spring is clamped between the fixed seat and the sensor.

[0008] Preferably, a ring-shaped washer is provided at the bottom of the fixed bracket, and the induction patch is accommodated in the inner cavity of the washer.

[0009] Preferably, an elastic rod is vertically arranged on the upper end surface of the fixed bracket, and an arc-shaped hook is integrally formed at the top of the elastic rod, and the arc-shaped hook is clamped on the inductor.

[0010] Preferably, a plurality of jacks are formed in the outer wall of the inductor, and the arc-shaped hook of the elastic rod is inserted into the jacks.

[0011] A non-contact flexible capacitive liquid level sensor proposed by the present utility model has the beneficial effects that: by arranging the foot pads, the distance between the inductor and the surface of the container to be monitored is increased, the influence of high temperature on the inductor is reduced, the spring arranged makes the induction patch closely attached to the container surface, the connecting rod is a non-metallic rod, reducing the heat conduction to the inductor, the induction patch is closely attached to the container surface, there is a certain static capacitance between the inductor and the ground. When the liquid level slowly rises and approaches the inductor, the parasitic capacitance of the liquid will be coupled to this static capacitance, making the final capacitance value of the inductor become larger. This changed capacitance signal is then input into the control IC for signal conversion, converting the changed capacitance into a change in a certain electrical signal, realizing the monitoring of the liquid level, and without directly contacting the liquid, realizing non-contact liquid level monitoring. Description of the Drawings

[0012] Figure 1 is a schematic structural diagram of a non-contact flexible capacitive liquid level sensor proposed by the present utility model;

[0013] Figure 2 is an axonometric view of a non-contact flexible capacitive liquid level sensor proposed by the present utility model;

[0014] Figure 3 is a top view of a non-contact flexible capacitive liquid level sensor proposed by the present utility model;

[0015] Figure 4 is an exploded view of a non-contact flexible capacitive liquid level sensor proposed by the present utility model;

[0016] Figure 5 is an enlarged view of the structure of part A of a non-contact flexible capacitive liquid level sensor proposed by the present utility model.

[0017] In the figure: 1 inductor, 2 spring, 3 fixed seat, 4 quick connector, 5 flexible wire, 6 foot pad, 7 patch, 8 induction patch, 9 connecting rod, 10 fixed bracket, 11 elastic rod, 12 washer, 13 jack. Detailed Embodiments

[0018] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments.

[0019] Referring to Figures 1-5 , a non-contact flexible capacitive liquid level sensor includes a sensor 1 and a fixed bracket 10. Pad feet 6 are provided at the four corners of the bottom of the fixed bracket 10. A patch 7 is bonded to the bottom of the pad feet 6, and the patch 7 is bonded to the surface of the container. The bottom of the sensor 1 is connected to a connecting rod 9. The connecting rod 9 passes through the fixed bracket 10 and is connected to an induction patch 8. The induction patch 8 contacts the surface of the container. The induction patch 8 is electrically connected to the sensor 1 through a wire. The connecting rod 9 is a non-metallic rod to reduce the conduction of heat to the sensor.

[0020] The outer wall of the sensor 1 is wrapped with a rigid outer shell, and the surface of the rigid outer shell is coated with a heat-insulating rubber sleeve. A fixed seat 3 is fixedly connected to the upper end surface of the fixed bracket 10. The connecting rod 9 passes through the fixed seat 3. A spring 2 is sleeved on the outer wall of the connecting rod 9. The spring 2 is clamped between the fixed seat 3 and the sensor 1. The sensor 3 has a certain static capacitance to the ground. When the liquid level in the container slowly rises and approaches the sensor 1, the parasitic capacitance of the liquid will be coupled to this static capacitance, making the final capacitance value of the sensor larger. The changed capacitance signal is then input to the control IC for signal conversion, converting the changed capacitance into a change amount of a certain electrical signal to achieve the monitoring of the liquid level.

[0021] A ring-shaped washer 12 is provided at the bottom of the fixed bracket 10. The induction patch 8 is accommodated in the inner cavity of the washer 12. An elastic rod 11 is vertically provided on the upper end surface of the fixed bracket 10. An arc-shaped hook is integrally formed at the top of the elastic rod 11. The arc-shaped hook is clamped on the sensor 1. A plurality of jacks 13 are opened on the outer wall of the sensor 1, and the arc-shaped hook of the elastic rod 11 is clamped into the jacks 13.

[0022] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution of the present invention and its inventive concept, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

Claims

1. A non-contact flexible capacitive liquid level sensor, comprising a sensor (1) and a fixing bracket (10), characterized in that: The four corners of the bottom of the fixed bracket (10) are provided with feet (6), the bottom of the feet (6) is bonded with a patch (7), the patch (7) is bonded to the surface of the container, the bottom of the sensor (1) is connected to a connecting rod (9), the connecting rod (9) passes through the fixed bracket (10) and is connected with a sensing patch (8), the sensing patch (8) is in contact with the surface of the container, and the sensing patch (8) is electrically connected to the sensor (1) through a wire.

2. A non-contact flexible capacitive liquid level sensor according to claim 1, characterized in that: The outer wall of the sensor (1) is wrapped with a hard shell, and the surface of the hard shell is covered with a heat-insulating rubber sleeve.

3. The non-contact flexible capacitive liquid level sensor according to claim 1, characterized in that: The upper end surface of the fixed bracket (10) is fixedly connected to a fixed seat (3), the connecting rod (9) passes through the fixed seat (3), the outer wall of the connecting rod (9) is sleeved with a spring (2), and the spring (2) is clamped between the fixed seat (3) and the sensor (1).

4. The non-contact flexible capacitive liquid level sensor according to claim 1, characterized in that: An annular gasket (12) is provided at the bottom of the fixing bracket (10), and the sensing patch (8) is accommodated in the inner cavity of the gasket (12).

5. The non-contact flexible capacitive liquid level sensor according to claim 1, characterized in that: An elastic rod (11) is vertically arranged on the upper end surface of the fixing bracket (10), and an arc-shaped hook is integrally formed on the top of the elastic rod (11), and the arc-shaped hook is hooked on the sensor (1).

6. The non-contact flexible capacitive liquid level sensor according to claim 5, characterized in that: The outer wall of the sensor (1) is provided with a plurality of insertion holes (13), and the arc-shaped hooks of the elastic rod (11) are inserted into the insertion holes (13).

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