Oil dielectric constant detection sensor

Abstract

The utility model discloses an oil dielectric constant detection sensor which comprises a sensor body, electrodes are fixedly connected to the bottom end of the sensor body, a cylindrical pole plate gap is formed between the electrodes, a cleaning ring is coaxially connected to the interior of the pole plate gap in a sliding and sealing mode, an inner cavity used for containing a power piece is formed in the body, and the power piece is in transmission connection with the cleaning ring. According to the utility model, power is provided for the cleaning ring through the power piece, the cleaning ring is driven to move in the gap between the electrode plates, so that stains on the electrode are cleaned through the cleaning ring, the cleanliness of the electrode is improved, and the measurement precision and accuracy of the sensor are improved.

Description

Technical Field

[0001] This utility model belongs to the field of sensor technology, and in particular relates to an oil dielectric constant detection sensor. Background Technology

[0002] Dielectric constant is an indicator that reflects the comprehensive physical and chemical properties of oil. By monitoring changes in dielectric constant, we can reflect the changes in the comprehensive properties of oil caused by various factors such as water content, coolant intrusion, acidification, and oxidation. This helps determine the service life of the oil, the oil change time, reduce oil change costs, and ultimately ensure the smooth operation of equipment.

[0003] Patent CN217931819U discloses a capacitive dielectric constant sensor. When this sensor is in use, dirt inside the oil can easily accumulate on the surfaces of the first and second electrodes. The accumulation of dirt can change the effective area between the electrodes, the electrode spacing, or the dielectric constant of the filling medium, thereby causing deviations in the measurement results. It cannot accurately reflect the true dielectric constant of the measured medium, thus reducing the measurement accuracy and precision.

[0004] Therefore, it is necessary to improve the sensors in the existing technology. Utility Model Content

[0005] The purpose of this invention is to overcome the defects in the existing technology and provide an oil dielectric constant detection sensor to improve the accuracy and precision of the sensor in detecting the dielectric constant of the filling medium.

[0006] To achieve the above objectives, the specific technical solution of the oil dielectric constant detection sensor of this utility model is as follows:

[0007] An oil dielectric constant detection sensor includes a sensor body, an electrode fixedly connected to the bottom end of the body, a cylindrical electrode gap between the electrodes, a cleaning ring coaxially and slidably sealed inside the electrode gap, and an inner cavity inside the body for accommodating a power component, the power component being drivenly connected to the cleaning ring.

[0008] Preferably, in order to protect the electrode and reduce the probability of damage, one end of the electrode is fixedly connected to the main body, and the other end of the electrode is fixedly connected to an end cap, which has a mesh structure.

[0009] Preferably, in order to improve the convenience of sensor maintenance, the top of the main body is open, and the opening of the main body is sealed and detachably connected to a top cover.

[0010] Preferably, in order to drive the cleaning ring to move within the gap between the electrodes, the main body has a guide hole that connects the inner cavity and the gap between the electrodes. The power component includes a permanent magnet disposed inside the guide hole. The permanent magnet is fixedly connected to the cleaning ring via a slide rod. An electromagnet is fixedly connected inside the inner cavity.

[0011] Preferably, in order to ensure that the cleaning ring has sufficient travel within the electrode gap and improve the cleaning effect on the substrate space, the length of the guide hole is greater than the length of the electrode gap.

[0012] Preferably, in order to reduce the resistance to the movement of the cleaning ring and reduce the energy consumption of the sensor, the permanent magnet is fitted with the guide hole with a clearance, and the slide rod is fitted with the guide hole with a clearance.

[0013] Preferably, in order to separate the inner cavity and the electrode plate gap and reduce the probability of sensor damage, a stepped portion is provided at the end of the guide hole that communicates with the inner cavity, and a sealing cap is provided on the stepped portion.

[0014] Preferably, in order to improve the smoothness of the cleaning ring movement, the axis of the guide hole is parallel to the axis of the electrode gap, and multiple guide holes are equally spaced around the axis of the electrode gap. The number of permanent magnets is equal to the number of guide holes and they correspond one-to-one.

[0015] The oil dielectric constant detection sensor of this invention has the following advantages: the cleaning ring is powered by a power component, which drives the cleaning ring to move inside the gap between the electrodes, thereby cleaning the dirt on the electrodes and improving the cleanliness of the electrodes, thus improving the measurement accuracy and precision of the sensor. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the sensor structure of this utility model;

[0017] Figure 2 This is an exploded view of the sensor of this utility model;

[0018] Figure 3 This is a cross-sectional view of the sensor of this utility model;

[0019] Figure 4 This is a schematic diagram of the main structure of the present utility model;

[0020] Figure 5 This is a cross-sectional view of the main body of this utility model;

[0021] Figure 6 This is a schematic diagram of the connection structure between the cleaning ring and the power component of this utility model;

[0022] The markings in the diagram are as follows: 1. Main body; 2. Electrode; 3. Top cover; 4. End cover; 5. Cleaning ring; 6. Electromagnet; 7. Sealing cover; 101. Inner cavity; 102. Guide hole; 103. Stepped part; 201. Electrode gap; 501. Slide rod; 502. Permanent magnet. Detailed Implementation

[0023] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings and examples. The following examples are only used to more clearly illustrate the technical solution of this utility model and should not be construed as limiting the scope of protection of this utility model.

[0024] The terms "top surface," "bottom surface," and "full surface" are used with reference to the normal operating state of the sensor and are only for the convenience of describing this utility model and simplifying the description. They are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this utility model.

[0025] like Figure 1-3 As shown, an oil dielectric constant detection sensor includes a sensor body 1, an electrode 2 fixedly connected to the bottom end of the body 1, a cylindrical electrode gap 201 between the electrodes 2, a cleaning ring 5 coaxially slidingly and sealingly connected inside the electrode gap 201, and an inner cavity 101 for accommodating a power component inside the body 1, the power component being drivenly connected to the cleaning ring 5.

[0026] The aforementioned sensor is used to detect the dielectric constant of oil. During installation, only electrode 2 is immersed in the oil. Electrode 2 includes a columnar first electrode and a cylindrical second electrode, forming an electrode gap 201 between them. When the oil enters the electrode gap 201, it changes the sensor's capacitance, thereby measuring the dielectric constant of the oil and ultimately understanding its quality, composition, humidity, and other information. The working principle of this sensor is as follows: the cleaning ring 5 is a plastic ring with a rubber layer attached to its outer surface. The plastic ring provides support, and the rubber layer is used for... The seal between the cleaning ring 5 and the electrode 2 is achieved by a power component driving the cleaning ring 5 to move along the axial direction of the electrode inside the electrode gap 201. When the cleaning ring 5 moves away from the main body 1, it can push the dirt adhering to the surface of the electrode 2 to the outside of the electrode gap 201, thereby cleaning the electrode 2 and improving the detection accuracy and precision of the subsequent sensor. When the cleaning ring 5 moves to a position close to the main body 1, due to the sealed connection between the cleaning ring 5 and the electrode 2, the oil will be drawn into the electrode gap 201, at which point the dielectric constant of the oil can be detected.

[0027] Compared with existing sensors, this sensor firstly cleans the electrode 2, improving its detection accuracy and precision. Secondly, the cleaning ring 5 acts as a piston, drawing oil into and expelling it from the electrode gap 201. This allows for sampling and replacement of oil even in still oil, facilitating oil detection. Furthermore, once the oil is drawn into the electrode gap 201, the shielding effect of the electrode 2 slows its flow or keeps it stationary. When the oil is still, the electric field distribution is stable and uniform, which helps the sensor accurately detect capacitance and thus precisely obtain the dielectric constant, further improving the sensor's detection accuracy and precision.

[0028] Further improvements include, for example Figure 2 and 3 As shown, one end of electrode 2 is fixedly connected to the main body 1, and the other end of electrode 2 is fixedly connected to an end cap 4, which has a mesh structure. The end cap 4 is made of rubber material and is located entirely outside the electrode gap 201. Thus, during sensor installation, the end cap 4 can protect the end of electrode 2 and prevent it from being damaged by impact. Secondly, the end cap 4 can also limit the movement range of the cleaning ring 5 and prevent it from falling out of the electrode gap 201. The mesh structure allows oil to easily pass through the end cap 4 into and out of the electrode gap 201, facilitating sensor sampling and detection. Furthermore, the mesh aperture is large enough to reduce the obstruction encountered when dirt is discharged from the electrode gap 201.

[0029] Further improvements include, for example Figure 2 and 3 As shown, the top of the main body 1 is open, and a top cover 3 is detachably and sealed at the opening. By opening the top cover 3, the inner cavity 101 can be opened and closed, thereby facilitating the inspection and maintenance of the components inside the inner cavity 101 and the maintenance of the sensor.

[0030] Further improvements include, for example Figure 4-6As shown, the main body 1 has a guide hole 102 connecting the inner cavity 101 and the electrode gap 201. The power component includes a permanent magnet 502 disposed inside the guide hole 102. The permanent magnet 502 is fixedly connected to the cleaning ring 5 via a slide rod 501. An electromagnet 6 is fixedly connected inside the inner cavity 101. In this sensor, the guide hole 102 is used to accommodate the permanent magnet 502 and restrict the movement direction of the permanent magnet 502 to the axial direction of the electrode 2. By controlling the on / off state of the electromagnet 6 and controlling the direction of the current in the electromagnet 6, the electromagnet 6 and the permanent magnet 502 can be made to attract or repel each other. When they attract each other, the cleaning ring 5 moves towards the main body 1; when they repel each other, the cleaning ring 5 moves towards the main body 1. When the electromagnet 6 is de-energized, the friction between the cleaning ring 5 and the electrode 2 can keep the cleaning ring 5 in its current position. By controlling the current of electromagnet 502, a sufficiently large force can be generated between electromagnet 502 and permanent magnet 502 to drive cleaning ring 5 to move. The cleaning ring 5 is in a sealed state with electrode 2, which can also prevent oil from entering the interior cavity 101 through guide hole 102, thereby reducing the failure rate of sensor. A silicon steel sheet layer can be set on the side of permanent magnet 502 near electrode 2 to isolate the magnetic field of permanent magnet 502. When the sensor is detecting, electromagnet 6 can be de-energized, thereby reducing the influence of magnetic field on sensor detection accuracy.

[0031] Further improvements include, for example Figure 5 As shown, the length of the guide hole 102 is greater than the length of the electrode gap 201. The length of the guide hole 102 determines the travel range of the permanent magnet 502. Therefore, with the above arrangement, the permanent magnet 501 can drive the cleaning ring 5 to move within the length range of the electrode gap 201 within its own range of movement.

[0032] Further improvements include, for example Figure 3 As shown, the permanent magnet 502 is clearance-fitted with the guide hole 102, and the slide rod 501 is clearance-fitted with the guide hole 102. This clearance fit reduces the contact between the permanent magnet 502 and the guide hole 102, as well as between the slide rod 501 and the guide hole 102, thereby reducing the generated friction and consequently reducing the resistance to the movement of the cleaning ring 5, thus improving the smoothness of the cleaning ring 5's movement.

[0033] Further improvements include, for example Figure 5As shown, a stepped portion 103 is provided at one end of the guide hole 102 that communicates with the inner cavity 101, and a sealing cover 7 is provided on the stepped portion 103. The stepped portion 103 can restrict the sealing cover 7 and improve the stability of the sealing cover 7. The sealing cover 7 can be a rubber sheet. The electromagnet 6 can be fixed inside the inner cavity 101 by screws. At the same time, the electromagnet 6 presses the sealing cover 7, and the sealing cover 7 seals the end of the guide hole 102, thereby reducing the probability of oil entering the inner cavity 101 through the guide hole 102 and reducing the probability of sensor damage.

[0034] Further improvements include, for example Figure 4 and 6 As shown, the axis of the guide hole 102 is parallel to the axis of the electrode gap 201. Multiple guide holes 102 are evenly spaced around the axis of the electrode gap 201. The number of permanent magnets 502 is equal to the number of guide holes 102, and they correspond one-to-one. The arrangement of multiple permanent magnets 502 allows for the simultaneous application of force to multiple positions of the cleaning ring 5, thereby making the cleaning ring 5 more stable under force and preventing deflection during movement, thus improving the stability and smoothness of the cleaning ring 5's movement.

[0035] It is understood that this utility model has been described through some embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of this utility model. Furthermore, under the teachings of this utility model, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the protection scope of this utility model.

Claims

1. An oil dielectric constant detection sensor, comprising a sensor body (1), wherein an electrode (2) is fixedly connected to the bottom end of the body (1), characterized in that: The electrodes (2) have a cylindrical electrode gap (201) between them. A cleaning ring (5) is coaxially and slidably sealed inside the electrode gap (201). The main body (1) has an inner cavity (101) for accommodating the power component. The power component is connected to the cleaning ring (5) in a transmission manner.

2. The oil dielectric constant detection sensor according to claim 1, characterized in that, One end of the electrode (2) is fixedly connected to the main body (1), and the other end of the electrode (2) is fixedly connected to an end cap (4), which has a mesh structure.

3. The oil dielectric constant detection sensor according to claim 1, characterized in that, The top of the main body (1) is open, and the opening of the main body (1) is sealed and detachably connected to a top cover (3).

4. The oil dielectric constant detection sensor according to claim 1, characterized in that, The main body (1) has a guide hole (102) inside which connects the inner cavity (101) and the gap (201) between the pole plates. The power component includes a permanent magnet (502) disposed inside the guide hole (102). The permanent magnet (502) is fixedly connected to the cleaning ring (5) through a slide rod (501). An electromagnet (6) is fixedly connected inside the inner cavity (101).

5. The oil dielectric constant detection sensor according to claim 4, characterized in that, The length of the guide hole (102) is greater than the length of the electrode gap (201).

6. The oil dielectric constant detection sensor according to claim 4, characterized in that, The permanent magnet (502) is clearance-fitted with the guide hole (102), and the slide rod (501) is clearance-fitted with the guide hole (102).

7. The oil dielectric constant detection sensor according to claim 6, characterized in that, The guide hole (102) is connected to the inner cavity (101) at one end, and a step portion (103) is provided on the step portion (103), and a sealing cap (7) is provided on the step portion (103).

8. The oil dielectric constant detection sensor according to claim 4, characterized in that, The axis of the guide hole (102) is parallel to the axis of the electrode gap (201). Multiple guide holes (102) are arranged at equal intervals around the axis of the electrode gap (201). The number of permanent magnets (502) is equal to that of the guide holes (102) and they correspond one-to-one.

Images