CN104457907B - Non-contact detection device for measuring liquid level in insulating container - Google Patents

Abstract

The present invention discloses a non-contact detection device for measuring the liquid level in an insulating container, comprising an upper environmental electrode plate, a lower reference electrode plate, and a vertical measuring electrode plate, each electrode plate comprising an intermediate insulating dielectric layer, a metal measuring layer, and a metal shielding layer, the measuring device further comprising a grounded capacitance sensor for measuring the isolated conductor capacitance value C1 of the metal measuring layer on the upper environmental electrode plate, the isolated conductor capacitance value C2 of the metal measuring layer on the lower reference electrode plate, and the isolated conductor capacitance value C3 of the metal measuring layer on the vertical measuring electrode plate, the grounded capacitance sensor is also electrically connected to a controller for calculating the height Hx of the liquid level in the insulating container relative to the bottom edge of the vertical measuring electrode plate according to the capacitance measurement result of the grounded capacitance sensor. The present invention has a simple structure, is easy to implement, and is convenient to detect.

Description

A non-contact detection device for measuring the liquid level in an insulating container

[technical field]

The invention relates to a non-contact detection device for measuring the liquid level in an insulating container.

[Background technique]

At present, the existing liquid level measurement devices are usually affected by the environment or the liquid to be measured, which makes the detection results have deviations, and its applicability is not good.

Therefore, it is necessary to solve the above problems.

[Content of the invention]

The invention overcomes the disadvantages of the above-mentioned technologies, and provides a non-contact detection device for measuring the liquid level in an insulating container, which has a simple structure, is easy to implement, and is convenient for detection.

To achieve the above object, the present invention adopts the following technical solutions:

A non-contact detection device for measuring the liquid level in an insulating container, comprising an upper environmental electrode plate 1, a lower reference electrode plate 2, and a vertical measuring electrode plate 3 arranged on the outer wall of the insulating container, The upper environmental electrode plate 1, the lower reference electrode plate 2, and the vertical measurement electrode plate 3 are all in the shape of a rectangular plate and include an intermediate insulating medium layer, which is arranged on one side of the intermediate insulating medium layer for contacting the outer wall of the insulating container. The metal measuring layer, and the metal shielding layer arranged on the other side of the intermediate insulating medium layer for shielding the influence of the outer side on the metal measuring layer during measurement, wherein the metal measuring layer is parallel to the metal shielding layer, and the three electrodes The width of the plates is L, the horizontal length of the upper environmental electrode plate 1 and the lower reference electrode plate 2 is H1, and the vertical length of the vertical measurement electrode plate 3 is H3. The non-contact measuring device also includes a Measure the isolated conductor capacitance C1 of the metal measurement layer on the upper environmental electrode plate 1, the isolated conductor capacitance C2 of the metal measurement layer on the lower reference electrode plate 2, and the isolated conductor capacitance of the metal measurement layer on the vertical measurement electrode plate 3 A grounded capacitive sensor 4 with a value of C3, the metal measuring layer and the metal shielding layer of the upper side environment electrode plate 1, the lower side reference electrode plate 2, and the vertical measurement electrode plate 3 are electrically connected to the grounded capacitive sensor 4 respectively The ground capacitance sensor 4 is also electrically connected with a controller 5 for calculating the height Hx of the liquid level in the insulating container relative to the bottom edge of the vertical measurement electrode plate 3 according to the capacitance measurement result of the ground capacitance sensor 4 .

In the non-contact detection device for measuring the liquid level in an insulating container as described above, the bottom edge of the vertical measuring electrode plate 3 and the bottom edge of the lower reference electrode plate 2 are all equal to the bottom end of the insulating container.

In the non-contact detection device for measuring the liquid level in an insulating container as described above, the upper side of the vertical measuring electrode plate 3 and the upper side of the upper environmental electrode plate 1 are all flush with the upper end of the insulating container.

In the above-mentioned non-contact detection device for measuring the liquid level in an insulating container, the height H3 of the vertical measuring electrode plate 3 is greater than its width L.

Compared with prior art, the beneficial effect of the present invention is:

1. The structure is simple and easy to implement. The upper environmental electrode plate, the lower reference electrode plate, the vertical measurement electrode plate, the grounding capacitance sensor, and the controller are used to insulate the liquid level in the container from the bottom edge of the vertical measurement electrode plate. The height Hx is convenient for detection, and the detection result Hx has nothing to do with the type of liquid, so the applicability is good.

2. Each electrode plate is in the shape of a rectangular flat plate, including an intermediate insulating medium layer, a metal measuring layer set on one side of the intermediate insulating medium layer for contacting the outer wall of the insulating container, and a metal measuring layer set on the other side of the intermediate insulating medium layer. In order to shield the metal shielding layer that affects the metal measurement layer on the outside during measurement, when the grounded capacitance sensor measures the isolated conductor capacitance value of the metal measurement layer, it applies the same excitation to the metal measurement layer and the metal shielding layer of the same electrode plate, so that When measuring, the potential between the metal measuring layer and the metal shielding layer of the same electrode plate is zero, thereby shielding the influence of the outside on the metal measuring layer and improving the accuracy of measurement.

3. The bottom edge of the vertical measurement electrode plate and the bottom edge of the lower reference electrode plate are equal to the bottom end of the insulating container. In this way, the measured Hx is the height of the liquid level relative to the bottom edge of the insulating container.

4. The upper side of the vertical measurement electrode plate and the upper side of the upper environmental electrode plate are equal to the upper end of the insulating container, so that the vertical measurement range of the vertical measurement electrode plate is enlarged as much as possible.

5. The height H3 of the vertical measurement electrode plate is greater than its width L, reducing the consumables in the width direction, which is convenient for specific implementation and practical measurement.

[Description of drawings]

Fig. 1 is a schematic diagram of the structure of the present invention.

Fig. 2 is a schematic diagram of the installation of three electrode plates of the present invention on the outer wall of an insulating container.

Fig. 3 is a schematic diagram of the three-layer structure of each electrode plate of the present invention.

[detailed description]

The features of the present invention and other related features will be further described in detail below in conjunction with the accompanying drawings through embodiments, so as to facilitate the understanding of those skilled in the art:

As shown in Figure 1-2, a non-contact detection device for measuring the liquid level in an insulating container is characterized in that it includes an upper environmental electrode plate 1 and a lower reference electrode for setting on the outer wall of the insulating container plate 2, and the vertical measuring electrode plate 3, the upper side environment electrode plate 1, the lower side reference electrode plate 2, and the vertical measuring electrode plate 3 are all in the shape of a rectangular flat plate and include an intermediate insulating medium layer, and are arranged on the intermediate insulating medium layer. One side of the medium layer is used for the metal measurement layer in contact with the outer wall of the insulating container, and the metal shielding layer arranged on the other side of the intermediate insulating medium layer is used to shield the outside from the influence of the metal measurement layer during measurement, wherein the metal measurement layer Parallel to the metal shielding layer, the width of the three electrode plates is L, the horizontal length of the upper environmental electrode plate 1 and the lower reference electrode plate 2 is H1, and the vertical length of the vertical measurement electrode plate 3 is H3 , the non-contact measuring device also includes an isolated conductor capacitance value C1 for measuring the metal measurement layer on the upper environmental electrode plate 1, an isolated conductor capacitance value C2 of the metal measurement layer on the lower side reference electrode plate 2, and vertical measurement The ground capacitance sensor 4 of the isolated conductor capacitance value C3 of the metal measurement layer on the electrode plate 3, the metal measurement layer and the metal shielding layer of the upper side environment electrode plate 1, the lower side reference electrode plate 2, and the vertical measurement electrode plate 3 They are all electrically connected to the grounded capacitance sensor 4 respectively, and the grounded capacitance sensor 4 is also electrically connected to be used for calculating the liquid level in the insulating container relative to the bottom edge of the vertical measurement electrode plate 3 according to the capacitance measurement result of the grounded capacitance sensor 4. The height Hx of the controller 5.

The working principle and usage process of this case are as follows:

During measurement, the ground capacitance sensor 4 measures the isolated conductor capacitance value C1 of the metal measurement layer on the upper environmental electrode plate 1, the isolated conductor capacitance value C2 of the metal measurement layer on the lower reference electrode plate 2, and the vertical measurement electrode plate 3 The isolated conductor capacitance C3 of the upper metal measurement layer.

As mentioned above, when measuring the isolated conductor capacitance value of the metal measurement layer, the same excitation is applied to the metal measurement layer and the metal shielding layer of the same electrode plate, so that the gap between the metal measurement layer and the metal shielding layer of the same electrode plate is measured. The potential is zero, thereby shielding the influence of the outside on the metal measurement layer and improving the accuracy of measurement.

As mentioned above, the capacitance value C3 is the capacitance value C of the vertical measuring electrode plate 3 under the influence of the lower liquid level in the insulating container and the capacitance value C of the vertical measuring electrode plate 3 under the influence of the upper air in the insulating container The algebraic sum, that is, there is C3=C down+C, and the measurement environment of the upper part of the vertical measurement electrode plate 3 is the same as the measurement environment of the upper side environment electrode plate 1, that is, their dielectric constants are the same, and the vertical measurement The measurement environment of the lower part of the electrode plate 3 is the same as the measurement environment of the lower reference electrode plate 2, that is, their dielectric constants are the same, as mentioned above, the capacitance calculation formula of the isolated conductor The distance between the three electrode plates and the conductor whose potential is zero is the same, and the capacitance value is proportional to the area, that is:

and

Finally, the height of the liquid level surface in the insulating container relative to the bottom edge of the vertical measurement electrode plate 3 is obtained

As mentioned above, the structure of this case is simple and easy to implement. The upper environmental electrode plate 1, the lower reference electrode plate 2, the vertical measurement electrode plate 3, the grounding capacitance sensor 4, and the controller 5 are used to insulate the liquid level in the container from the relative The height Hx of the bottom edge of the electrode plate 3 is measured vertically, which is convenient for detection, and the detection result Hx has nothing to do with the type of liquid, and has good applicability.

As mentioned above, when the bottom of the vertical measuring electrode plate 3 and the bottom of the lower reference electrode plate 2 are equal to the bottom of the insulating container, the measured Hx is the height of the liquid level relative to the bottom of the insulating container.

As mentioned above, the upper edge of the vertical measurement electrode plate 3 and the upper edge of the upper environmental electrode plate 1 are all flat with the upper end of the insulating container, so that the vertical measurement range of the vertical measurement electrode plate 3 is enlarged as much as possible.

As mentioned above, the height H3 of the vertical measurement electrode plate 3 is greater than its width L, which reduces the consumables in the width direction, which is convenient for specific implementation and practical measurement.

As mentioned above, what this case protects is a non-contact detection device for measuring the liquid level in an insulating container, and all technical solutions with the same or similar structure as this case shall be deemed to fall within the protection scope of this case.

Claims (4)

1. a kind of contactless detection device for being used to measure liquid level in insulating vessel, it is characterised in that include for being arranged on Upside environment battery lead plate (1), downside reference electrode plate (2) and vertical measuring electrode plate (3) on insulating vessel lateral wall, The upside environment battery lead plate (1), downside reference electrode plate (2), vertical measuring electrode plate (3) are all rectangular flat plate shape and all Including middle insulated medium layer, middle insulated medium layer side is arranged on for being measured with the metal of insulating vessel wall contacts Layer and be arranged on middle insulated medium layer opposite side be used for measurement when shielding on the outside of on metal measurement layer influence metal screen Layer is covered, wherein, the metal measurement layer is parallel with the metal screen layer, and the width of three electrode plates is all L, upside environment electricity Pole plate (1) and the lateral length of downside reference electrode plate (2) they are all H1, and the vertical extension of vertical measuring electrode plate (3) is H3, this Non-contact measurement apparatus also includes the isolated conductor capacitance for measuring metal measurement layer on upside environment battery lead plate (1) Gold on the isolated conductor capacitance C2 of metal measurement layer and vertical measuring electrode plate (3) on C1, downside reference electrode plate (2) Belong to the isolated conductor capacitance C3 of measurement layer ground capacity sensor (4), the upside environment battery lead plate (1), downside reference The metal measurement layer and metal screen layer of battery lead plate (2) and vertical measuring electrode plate (3) are all passed with the ground capacity respectively Sensor (4) is electrically connected, and is also electrically connected with the ground capacity sensor (4) for the electricity according to ground capacity sensor (4) Hold the controller (5) that measurement result calculates the height Hx on relatively described vertical measuring electrode plate (3) base of liquid level in insulating vessel.

2. a kind of contactless detection device for being used to measure liquid level in insulating vessel according to claim 1, its feature It is that vertical measuring electrode plate (3) base, downside reference electrode plate (2) base all maintain an equal level with insulating vessel bottom.

3. a kind of contactless detection device for being used to measure liquid level in insulating vessel according to claim 1, its feature It is that vertical measuring electrode plate (3) top, upside environment battery lead plate (1) top all maintain an equal level with the insulating vessel upper end.

4. a kind of non-contact detection dress for being used to measure liquid level in insulating vessel according to claim 1-3 any one Put, it is characterised in that the height H3 of the vertical measuring electrode plate (3) is more than its width L.