High-voltage-resistant capacitive liquid level sensor

Abstract

The utility model discloses a high-voltage-resistant capacitive liquid level sensor which comprises a sensor body, the sensor body comprises an outer pipe, an outer pipe connecting rod is installed at the top end of the outer pipe, a fixing sleeve is installed at the top end of the outer pipe connecting rod, an insulating joint is sleeved on the outer side of the outer pipe connecting rod, and a top support is fixedly installed on the fixing sleeve. A bottom supporting body is fixedly installed at the bottom end of the outer pipe, a probe rod is arranged in the outer pipe, the bottom end of the probe rod is fixed to the bottom supporting body, the top end of the probe rod penetrates through the outer pipe connecting rod and the fixing sleeve and is fixed to the top support, a shell is welded to the fixing sleeve, a detection circuit is placed in the shell, and the outer side of the shell is sleeved with an insulating sheath; according to the high-voltage-resistant capacitive liquid level sensor, by arranging the insulating joint and the insulating sheath, the detection circuit in the shell can be protected, so that the insulation withstand voltage of the sensor can be increased from 50V to more than 2000V, and the insulation protection of the sensor is greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of liquid level sensors, in particular to a high voltage resistant capacitive liquid level sensor. Background Art

[0002] A capacitive liquid level sensor is a sensor used to continuously detect the liquid level of liquids such as water and oil. Currently, the common capacitive liquid level sensors on the market are basically installed directly on the shell and the liquid level box. The protection basically depends on the protection of the circuit board itself, and the insulation can basically only be around 50V. In some specific working conditions, such as substations, due to the high voltage environment, the electrical insulation performance of traditional capacitive liquid level sensors cannot meet the requirements, which will cause the product to age and be damaged easily, requiring frequent inspection and repair, or even replacement, which will affect the life of the equipment.

[0003] To this end, we design a high-voltage resistant capacitive liquid level sensor here. Utility Model Content

[0004] The purpose of the utility model is to provide a high voltage resistant capacitive liquid level sensor to solve the problems raised in the background technology in view of the deficiencies of the prior art.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a high-voltage resistant capacitive liquid level sensor, comprising a sensor body, the sensor body comprising an outer tube, an outer tube connecting rod is installed at the top of the outer tube, a fixing sleeve is installed at the top of the outer tube connecting rod, an insulating joint is sleeved on the outer side of the outer tube connecting rod, a top bracket is fixedly installed on the fixing sleeve, a bottom support body is fixedly installed on the bottom end of the outer tube, a probe rod is arranged inside the outer tube, the bottom end of the probe rod is fixed on the bottom support body, the top end of the probe rod passes through the outer tube connecting rod and the fixing sleeve and is fixed on the top bracket, an outer shell is welded on the fixing sleeve, a detection circuit is placed in the outer shell, and an insulating sheath is sleeved on the outer side of the outer shell.

[0006] Preferably, a wire is connected to the detection circuit, and the wire passes through the housing.

[0007] Preferably, a circular through hole penetrating the outer tube is provided at a position close to the bottom end and a position close to the top end of the side wall of the outer tube.

[0008] Preferably, the outer tube is made of an aluminum alloy tube or a stainless steel tube.

[0009] Preferably, the bottom support body is made of a plastic support body with a low dielectric constant.

[0010] Preferably, the top bracket is a plastic bracket with a low dielectric constant.

[0011] Preferably, the insulating joint is a plastic joint with a low dielectric constant.

[0012] Compared with the prior art, the utility model provides a high voltage resistant capacitive liquid level sensor, which has the following beneficial effects:

[0013] The high-voltage resistant capacitive liquid level sensor can protect the detection circuit in the shell by providing an insulating joint and an insulating sheath, thereby increasing the insulation withstand voltage of the sensor from 50V to more than 2000V, greatly improving the insulation protection of the sensor, reducing the failure rate of the sensor, and reducing the maintenance, repair and replacement costs of the sensor. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a cross-sectional view of the overall structure of the utility model;

[0015] Figure 2 This is a schematic diagram of the installation of the utility model.

[0016] Figure numerals: 1. bottom support body; 2. probe rod; 3. outer tube; 4. outer tube connecting rod; 5. insulating joint; 6. fixing sleeve; 7. top bracket; 8. detection circuit; 9. wire; 10. outer shell, 11. insulating sheath; 12. sensor body; 13. liquid level box. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0018] See also Figure 1 and Figure 2In the present embodiment: a high voltage resistant capacitive liquid level sensor comprises a sensor body 12, wherein the sensor body 12 comprises an outer tube 3, the outer tube 3 is made of an aluminum alloy tube or a stainless steel tube, an outer tube connecting rod 4 is installed at the top of the outer tube 3, a fixing sleeve 6 is installed at the top of the outer tube connecting rod 4, the outer tube 3, the outer tube connecting rod 4 and the fixing sleeve 6 constitute the second electrode of the sensor as a whole, and a circular through hole penetrating the outer tube 3 is arranged at a position near the bottom end and a position near the top end on the side wall of the outer tube 3, when the sensor detects the liquid level, the liquid can enter the inner part of the outer tube 3 from the circular through hole at the bottom of the outer tube 3, an insulating joint 5 is sleeved on the outer side of the outer tube connecting rod 4, and the insulating joint 5 is made of a plastic joint with a low dielectric constant, a top bracket 7 is fixedly installed on the fixing sleeve 6, and the top bracket 7 is made of a plastic bracket with a low dielectric constant, a bottom support body 1 is fixedly installed at the bottom end of the outer tube 3, and the bottom support body 1 is made of a plastic support body with a low dielectric constant, and the inner part of the outer tube 3 is provided with The probe rod 2 is the first electrode of the sensor. The bottom end of the probe rod 2 is fixed on the bottom support body 1. The top end of the probe rod 2 passes through the outer tube connecting rod 4 and the fixing sleeve 6 and is fixed on the top bracket 7. A shell 10 is welded on the fixing sleeve 6. A detection circuit 8 is placed in the shell 10. The shell 10 can protect the detection circuit 8. An insulating sheath 11 is sleeved on the outer side of the shell 10. The shell 10 is wrapped as a whole by the insulating sheath 11, thereby adding another layer of protection to the detection circuit 8 in the shell 10, which can increase the insulation withstand voltage of the sensor from 50V to more than 2000V, greatly improving the insulation protection of the sensor, reducing the failure rate of the sensor, and reducing the maintenance, repair and replacement costs of the sensor. The detection circuit 8 is connected with a wire 9, and the wire 9 passes through the shell 10. When the sensor is installed, the shell 10 is fixed to the top of the liquid level box 13, and the outer tube 3 is extended into the interior of the liquid level box 13.

[0019] Finally, it should be noted that the above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A high voltage resistant capacitive liquid level sensor, comprising a sensor body (12), characterized in that: The sensor body (12) comprises an outer tube (3), an outer tube connecting rod (4) is mounted on the top of the outer tube (3), a fixing sleeve (6) is mounted on the top of the outer tube connecting rod (4), an insulating joint (5) is sleeved on the outside of the outer tube connecting rod (4), a top bracket (7) is fixedly mounted on the fixing sleeve (6), a bottom support body (1) is fixedly mounted on the bottom end of the outer tube (3), a probe rod (2) is arranged inside the outer tube (3), the bottom end of the probe rod (2) is fixed on the bottom support body (1), the top end of the probe rod (2) passes through the outer tube connecting rod (4) and the fixing sleeve (6) and is fixed on the top bracket (7), an outer shell (10) is welded on the fixing sleeve (6), a detection circuit (8) is placed inside the outer shell (10), and an insulating sheath (11) is sleeved on the outside of the outer shell (10).

2. The high voltage resistant capacitive liquid level sensor according to claim 1, characterized in that: The detection circuit (8) is connected to a wire (9), and the wire (9) passes through the housing (10).

3. The high voltage resistant capacitive liquid level sensor according to claim 1, characterized in that: A circular through hole penetrating the outer tube (3) is provided on the side wall of the outer tube (3) at a position close to the bottom end and a position close to the top end.

4. The high voltage resistant capacitive liquid level sensor according to claim 1, characterized in that: The outer tube (3) is made of an aluminum alloy tube or a stainless steel tube.

5. The high voltage resistant capacitive liquid level sensor according to claim 1, characterized in that: The bottom support body (1) is a plastic support body with a low dielectric constant.

6. The high voltage resistant capacitive liquid level sensor according to claim 1, characterized in that: The top bracket (7) is a plastic bracket with a low dielectric constant.

7. The high voltage resistant capacitive liquid level sensor according to claim 1, characterized in that: The insulating joint (5) is a plastic joint with a low dielectric constant.

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