Device for measuring trace moisture of oil product

Abstract

The utility model belongs to the technical field of electrical insulating oil performance detection, and discloses an oil product trace moisture measuring device which comprises a detection assembly and further comprises a sampling bottle, a sampling assembly is arranged in the sampling bottle and comprises a sampling cavity, and the sampling cavity is arranged in the sampling bottle and communicated with the sampling bottle through a pipeline; the driving unit is used for driving the sampling chamber to rotate in the circumferential direction; one end of the sampling tube is arranged in the sampling chamber and is located at the rotating central axis of the sampling chamber, and the free end of the sampling tube penetrates through the sampling chamber and is communicated with the detection assembly; according to the scheme, the rotatable sampling chamber is arranged, and the driving unit is used for driving the oil sample to rotate circumferentially, so that metal particles with relatively high density migrate towards the outer side of the chamber under the action of centrifugal force, and the sampling pipe located at the rotating central axis only extracts insulating oil in a central region with extremely low metal particle content and conveys the insulating oil to the detection assembly; according to the utility model, the problem of detection result deviation caused by metal particles in transformer insulating oil is solved.

Description

Technical Field

[0001] This solution belongs to the field of electrical insulating oil performance testing technology, specifically involving a device for determining trace moisture content in oil products. Background Technology

[0002] Referring to the existing public (announcement) document CN109060953A, the performance of electrical insulating oil directly affects the safe operation and service life of electrical equipment. Taking transformer insulating oil as an example, the trace moisture content in transformer insulating oil is one of the main factors affecting the oil's insulation strength. By detecting the moisture content in transformer insulating oil, not only can the insulation strength of the transformer insulating oil be prevented from decreasing to a dangerous level, but the overall insulation condition of the transformer can also be assessed.

[0003] A live detection device and method for the moisture content of electrical insulating oil is disclosed in existing publication (announcement number CN109060953A). The device includes: an oscillation frequency counter, an oil sample isothermal detection chamber, and a crystal oscillator. The crystal oscillator, with a hydrophilic coating on its surface, is installed in the oil sample isothermal detection chamber and is used to generate an oscillation frequency and transmit it to the oscillation frequency counter. The oil sample isothermal detection chamber, which houses the crystal oscillator, is used to hold electrical insulating oil. The oscillation frequency counter is connected to the crystal oscillator and is used to record the oscillation frequency generated by the crystal oscillator. The moisture content of the electrical insulating oil is obtained based on the change in the oscillation frequency generated by the crystal oscillator.

[0004] For example, the aforementioned insulating oil moisture detection device detects the water content in the insulating oil using a crystal oscillator and an oscillation frequency counter. However, during transformer operation, mechanical wear (such as friction from tap changer contacts and oil pump wear), contact erosion caused by arc discharge, and metal ions generated by the aging of insulating materials or the reaction of corrosive sulfides with metal components can all interfere with moisture detection. On the one hand, metal particles are conductive and easily polarize in an electric field, forming "conductive bridges," leading to local electric field distortion. This can alter the electric field distribution on the crystal oscillator surface, causing a shift in the water adsorption characteristics of the hydrophilic coating. On the other hand, metal particles (especially copper and iron particles) can change the oil-water phase equilibrium, causing the frequency change detected by the crystal oscillator to reflect not only the moisture content but also abnormal dielectric parameters caused by the metal particles. Utility Model Content

[0005] The purpose of this solution is to provide a device for determining trace moisture in oil products, in order to solve the problem of deviation in test results caused by metal particles in transformer insulating oil.

[0006] To achieve the above objectives, this solution provides an oil trace moisture determination device, including a chassis and a detection component disposed within the chassis, characterized in that it further includes a sampling bottle, wherein the sampling bottle contains a sampling component, and the sampling component includes:

[0007] A sampling chamber is located inside a sampling bottle and is connected to the sampling bottle via a pipe;

[0008] A driving unit is used to drive the sampling chamber to rotate circumferentially;

[0009] A sampling tube, one end of which is located in the sampling chamber and on the central axis of rotation of the sampling chamber, and the free end of which passes through the sampling chamber and is connected to the detection component.

[0010] The principle and effect of this solution are as follows: by setting up a rotatable sampling chamber, the oil sample is rotated circumferentially by a drive unit, causing the denser metal particles to migrate to the outside of the chamber under the action of centrifugal force. Meanwhile, the sampling tube located on the central axis of rotation only extracts the insulating oil in the central area with extremely low metal particle content and delivers it to the detection component. This physically separates the metal interference before detection, eliminating its interference with the electric field distortion or dielectric parameters of sensors such as crystal oscillators and electrodes, and improving the accuracy of trace moisture detection. It is especially suitable for transformer oil samples with severe metal contamination (such as oil after arc discharge).

[0011] Furthermore, the drive unit includes a motor and a drive wheel. The output shaft of the motor is coaxially and fixedly connected to the drive wheel. The sampling chamber is provided with a driven wheel. The drive wheel and the driven wheel are connected by belt drive.

[0012] The principle and effect of this scheme are as follows: the motor drives the driving wheel, which in turn drives the driven wheel of the sampling chamber to rotate via belt transmission. The belt transmission buffer reduces the interference of motor vibration on the stability of the sampling chamber, ensuring that the chamber maintains a constant speed when rotating at high speed. This allows the metal particles in the oil sample to migrate fully to the outside under the action of continuous and uniform centrifugal force, thereby improving the purity of the oil sample in the central area.

[0013] Furthermore, the sampling bottle is provided with a liquid inlet, which is connected to a pipeline. The free end of the pipeline is located in the sampling chamber, the outer wall of the pipeline is in contact with the inner wall of the sampling chamber, and the free end of the pipeline extends to the bottom of the sampling chamber.

[0014] The principle and effect of this solution are as follows: by tightly fitting the outer wall of the inlet pipe to the inner wall of the sampling chamber and extending its free end to the bottom of the chamber, the insulating oil flows in from the inlet and is gently injected into the bottom along the inner wall of the chamber, thereby avoiding the generation of air bubbles due to turbulence during the high-speed injection process.

[0015] Furthermore, the sampling tube includes a first sampling tube and a second sampling tube. One end of the first sampling tube passes through the sampling chamber and is connected to the detection component. The first sampling tube is provided with a first sampling port. One end of the second sampling tube is located in the free end of the first sampling tube. The second sampling tube is a flexible second sampling tube. The free end of the second sampling tube is provided with a float plate. The second sampling tube is provided with a second sampling port.

[0016] The principle and effect of this scheme are as follows: By setting up a nested structure of a fixed first sampling tube and a flexible second sampling tube, combined with the buoyancy of a float plate, precise stratified sampling of different layers in the insulating oil is achieved. The first sampling tube is located on the central axis of rotation of the sampling chamber, with its first sampling port located in the lower middle part of the oil layer, used to collect the lower middle layer oil sample with extremely low metal particle content after centrifugation; a float plate is installed at the end of the flexible second sampling tube, and the float plate drives the free end of the second sampling tube to rise and fall with the oil layer interface using the density difference of the oil. The second sampling port is always aimed at the upper layer area of ​​the oil, thereby collecting the upper layer oil sample. It is suitable for scenarios where the moisture distribution of transformer insulating oil is uneven due to long-term stagnation or metal particle settling (such as high water content in the top oil layer and severe metal contamination at the bottom). Compared with traditional single-point sampling (which is prone to sample mixing due to oil layer disturbance), this scheme can simultaneously obtain independent samples of each layer in a single operation, avoiding interference from metal particles on the lower layer sample and the influence of air bubbles on the detection of the upper layer moisture content.

[0017] Furthermore, both the first sampling port and the second sampling port are wedge-shaped structures, and both the first sampling port and the second sampling port are provided with sealing balls for sealing the first sampling port and the second sampling port. The sealing balls are connected to springs for resetting the sealing balls. The system also includes a sampling unit that is connected to the first sampling tube.

[0018] The principle and effect of this scheme are as follows: When the sampling unit is started, a negative pressure is generated in the first and second sampling tubes. The negative pressure force overcomes the preload of the spring, causing the sealing ball in the wedge structure to slide away from the sampling port along the inclined surface, forming an oil flow channel. The insulating oil (with metal particles concentrated on the outside and the oil sample in the central area being pure) is drawn into the sampling tube and transported to the detection component through the pipeline. After sampling is completed, the negative pressure is released, the spring pushes the sealing ball to reset, and the sampling port is sealed.

[0019] Furthermore, the sampling unit includes a press pump and a first drive disk. The first drive disk is coaxially and fixedly connected to the driven wheel. The first drive disk is provided with a protrusion for pressing the press pump. The inlet end of the press pump is connected to the first sampling tube, and the outlet end is connected to the detection component.

[0020] The principle and effect of this scheme are as follows: When the drive unit drives the driven wheel to rotate, the first drive disc rotates accordingly, and its protrusion periodically squeezes the piston mechanism of the press pump; at the instant the protrusion contacts the press pump, the piston is quickly pressed down, forcing the original gas or oil in the pump chamber to be discharged from the outlet end to the detection component; when the protrusion disengages from the press pump, the piston rebounds under the action of the return spring, the pump chamber volume expands instantaneously to form a negative pressure, and the inlet end opens under the action of the pressure difference, drawing the insulating oil in the sampling tube into the pump chamber; as the drive disc continues to rotate, this process is repeated cyclically, realizing the intermittent negative pressure extraction and transportation of insulating oil.

[0021] Furthermore, it also includes a defoaming component disposed inside the sampling bottle. The defoaming component includes an air extraction pipe and an air pump. The air extraction pipe is connected to the sampling chamber. The air inlet of the air pump is connected to the air extraction pipe. The air outlet of the air pump is disposed outside the sampling bottle. The drive wheel is coaxially fixedly connected to a second drive disk. The second drive disk is provided with a striking block for pressing the air pump.

[0022] The principle and effect of this scheme are as follows: When the drive wheel rotates, it synchronously drives the second drive disc to rotate, which in turn periodically presses the piston mechanism of the suction pump, triggering the suction pump to intermittently apply negative pressure to the sampling chamber (vacuum degree can reach 5-7 kPa). During this process, suspended air bubbles in the oil are accelerated to the surface due to the negative pressure and are discharged to the outside of the sampling bottle through the suction pipe. Simultaneously, trace amounts of dissolved gas inside the oil are released due to the pressure reduction and are eliminated synchronously during the suction process. Through this setup, the air bubble content in the oil sample can be reduced, preventing air bubbles from entering the detection component. If air bubbles remain in the detection chamber, the difference in dielectric constant between the bubbles and the oil will interfere with the accuracy of capacitance or dielectric spectroscopy methods for trace moisture measurement (moisture detection error reaches ±0.5%), thus improving data accuracy.

[0023] Furthermore, the second drive disc has a first groove, the striking block is slidably disposed in the first groove, the striking block is connected to a tension spring, and the free end of the tension spring is fixedly connected to the first groove; the first drive disc has a second groove, the protrusion is slidably disposed in the second groove, the protrusion is connected to a compression spring, and the free end of the compression spring is fixedly connected to the second groove; the striking block slides to its limit position and contacts the air pump, and the protrusion slides to its limit position and is offset from the pressing pump.

[0024] The principle and effect of this scheme are as follows: When the insulating oil enters the sampling chamber, the drive unit starts at high speed (e.g., 5000 rpm), and the second drive disc rotates at high speed with the drive wheel. At this time, the striking block in the first groove slides to the limit position under the balance of centrifugal force and tension spring, striking the vacuum pump to draw the sample chamber under negative pressure (vacuum degree reaches 10 kPa), quickly removing more than 90% of the air bubbles in the oil within 15 seconds. Then the speed is reduced to 3000 rpm, the centrifugal force weakens, and the tension spring pulls the striking block back to the initial position of the groove and away from the vacuum pump. At the same time, the change in centripetal force caused by the restoring force of the compression spring and the reduction in speed squeezes the pressing pump. At this time, under the action of negative pressure, the detection component is drawn in through the wedge-shaped sampling port. This scheme realizes the process of air bubble removal, metal separation and layered sampling, so that the detection component obtains transformer oil samples with fewer air bubbles and low metal contamination, improving the accuracy of transformer oil detection.

[0025] Furthermore, both the first and second grooves are provided with sliding grooves, and the protrusion and the striking block are slidably connected to the sliding grooves in the first and second grooves, respectively.

[0026] The principle and effect of this solution are as follows: the groove is used to provide positioning and guidance for the movement of the bump and the striking block under the action of centrifugal force.

[0027] Furthermore, both the air inlet and outlet of the air pump are equipped with one-way valves.

[0028] The principle and effect of this solution is that by setting a one-way valve, the gas flows in a preset direction, thus preventing gas backflow. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the structure of a trace moisture determination device for oil products according to the present invention;

[0030] Figure 2 This is a schematic diagram of the internal structure of the sampling bottle of this utility model;

[0031] Figure 3 This is a schematic diagram of the internal structure of the sampling tube of this utility model;

[0032] Figure 4 This is a schematic diagram of the sampling component and defoaming component of this utility model.

[0033] The corresponding labels in the attached diagram are named as follows: chassis 1, sampling bottle 2, liquid inlet 21, sampling assembly 3, sampling chamber 31, pipe 311, sampling tube 32, first sampling tube 321, first sampling port 3211, second sampling tube 322, second sampling port 3221, float 323, sealing ball 324, spring 325, motor 33, driving wheel 34, driven wheel 35, press pump 36, first drive disc 37, protrusion 371, compression spring 372, second groove 373, defoaming assembly 4, air extraction pipe 41, air extraction pump 42, second drive disc 43, striking block 431, first groove 432, tension spring 433. Detailed Implementation

[0034] The following will describe the concept and technical effects of this utility model clearly and completely with reference to the embodiments, so as to fully understand the purpose, features and effects of this utility model. Obviously, the described embodiments are only a part of the embodiments of this utility model, not all of them. Other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are all within the scope of protection of this utility model.

[0035] Example:

[0036] Please see Figures 1-3A device for determining trace moisture in oil products includes a housing 1 and a detection component disposed within the housing 1. The detection component is prior art and can be referenced in the detection device described in CN109060953A. The housing 1 also includes a sampling bottle 2 with an inlet 21 connected to a pipe 311. The free end of the pipe 311 is located within a sampling chamber 31, with the outer wall of the pipe 311 fitting against the inner wall of the sampling chamber 31. The free end of the pipe 311 extends to the bottom of the sampling chamber 31, allowing the insulating oil to flow smoothly into the bottom of the sampling chamber 31 along the inner wall when it enters from the inlet 21, thus preventing air bubbles from forming due to turbulence during high-speed injection. A sampling assembly 3 is installed inside the sampling bottle 2. The sampling assembly 3 includes a sampling chamber 31, a sampling tube 32, and a drive unit. The sampling chamber 31 is located inside the sampling bottle 2 and is connected to the sampling bottle 2 via a pipe 311. The pipe 311 is equipped with a one-way valve to prevent backflow. One end of the sampling tube 32 is located inside the sampling chamber 31 and is situated on the rotation axis of the sampling chamber 31. The free end of the sampling tube 32 passes through the sampling chamber 31 and is connected to the detection chamber in the detection assembly. The drive unit includes a motor 33 and a drive wheel 34. The output shaft of the motor 33 (brushless DC motor, rated power 120W) is coaxially and fixedly connected to the drive wheel 34. The sampling chamber 31 is equipped with a driven wheel 35. The drive wheel 34 and the driven wheel 35 are connected by a polyurethane synchronous belt with a transmission ratio of 1:2, so that the sampling chamber 31 rotates at a uniform speed of 3000rpm under the drive of the motor. During centrifugation, denser metal particles (such as copper particles with a density of 8.96 g / cm³) migrate outward under centrifugal force, forming a metal-rich area with a radius ≥35 mm from the center of rotation. The concentration of metal particles within a radius of 15 mm from the center can be reduced to below 5 ppm. At this point, the sampling tube 32 located on the axis of rotation extracts insulating oil from the central area with extremely low metal particle content and delivers it to the detection component. This physically separates the metal interference before detection, eliminating its interference with the electric field distortion or dielectric parameters of sensors such as crystal oscillators and electrodes.

[0037] Please see Figure 3To sample insulating oil from different layers, the sampling tube 32 includes a first sampling tube 321 and a second sampling tube 322. The first sampling tube 321 is a hard stainless steel tube (outer diameter 6mm), with its axis coinciding with the rotation axis of the sampling chamber 31. One end of the first sampling tube 321 passes through the sampling chamber 31 and is connected to the detection component. The first sampling tube 321 has a first sampling port 3211, which is a wedge-shaped structure. The first sampling port 3211 (opening angle 30°) is located 30mm above the bottom of the sampling chamber 31 and is used to extract the middle and lower layer oil sample with extremely low metal contamination after centrifugation. The second sampling tube 322 is a flexible fluororubber tube (inner diameter 3mm), nested inside the first sampling tube 321. The second sampling tube 322 has a second sampling port 3221, and its end is connected to a polytetrafluoroethylene float plate 323 (density 0.8g / cm³). The float plate rises to the oil surface using the density difference of the oil, and samples the upper layer, avoiding the interlayer mixing error caused by traditional single-point sampling. Both the first sampling port 3211 and the second sampling port 3221 are equipped with sealing balls 324 for sealing the first sampling port 3211 and the second sampling port 3221. The sealing balls 324 are connected to springs 325 for resetting the sealing balls 324. The free end of the spring is fixedly connected to the inner wall of the first sampling tube 321 or the second sampling tube 322. The system also includes a sampling unit connected to the first sampling tube 321. The sampling unit includes a press pump 36 and a first drive disc 37. The press pump is a manually operated press pump 36. The first drive disc 37 is coaxially fixedly connected to the driven wheel 35. The first drive disc 37 is provided with protrusions 371 for pressing the press pump 36. The inlet end of the press pump 36 is connected to the first sampling tube 321, and the outlet end is connected to the detection component.

[0038] Specific workflow: When the drive unit drives the driven wheel 35 to rotate, the insulating oil in the sampling chamber 31 rotates, and the first drive disc 37 rotates accordingly. The protrusion 371 on it periodically squeezes the piston mechanism of the press pump 36. At the instant the protrusion 371 contacts the press pump 36, the piston is quickly pressed down, forcing the original gas or oil in the pump chamber to be discharged from the outlet to the detection component. When the protrusion 371 disengages from the press pump 36, the piston rebounds under the action of the return spring, and the pump chamber volume expands instantaneously to form a negative pressure. The first sampling tube 321 and the second sampling tube 32 A negative pressure is generated inside the pump. The negative pressure force overcomes the preload of the spring 325, causing the sealing ball 324 to slide away from the first sampling port 3211 and the second sampling port 3221 along the inclined surface, forming an oil flow channel. The insulating oil (with metal particles concentrated on the outside and the oil sample in the central area being pure) is drawn into the first sampling tube 321 and the second sampling tube 322, and then the insulating oil in the first sampling tube 321 and the second sampling tube 322 is drawn into the pump cavity. As the first drive disc 37 continues to rotate, this process is repeated, realizing the intermittent negative pressure extraction and transportation of the insulating oil.

[0039] Please see Figure 2 and Figure 4 It also includes a defoaming component 4 installed inside the sampling bottle 2. The defoaming component 4 includes a suction pipe 41 and a suction pump 42 (diaphragm vacuum pump, ultimate vacuum degree -90kPa). The suction pipe 41 is connected to the sampling chamber 31. The air inlet of the suction pump 42 is connected to the suction pipe 41. Both the air inlet and outlet of the suction pump 42 are equipped with one-way valves to prevent gas backflow. The air outlet of the suction pump 42 is located outside the sampling bottle 2 and is equipped with an activated carbon filter. The drive wheel 34 is coaxially fixedly connected to a second drive disc 43. The second drive disc 43 is equipped with a striking block 431 for pressing the suction pump 42. When the motor starts at a high speed of 5000 rpm, the striking block 431 slides to its limit position under the action of centrifugal force, impacting the diaphragm of the vacuum pump 42 at a frequency of 20 Hz, so that a -10 kPa pulse negative pressure is formed in the sampling chamber 31, the bubble rising rate is increased by 3 times, and the bubble volume fraction drops to below 0.1% within 15 seconds, avoiding bubble rupture and interference with the detection accuracy of dielectric spectroscopy.

[0040] Please continue reading. Figure 4 The second drive disc 43 has a first groove 432, and the striking block 431 is slidably disposed in the first groove 432. The striking block 431 is connected to a tension spring 433, and the free end of the tension spring 433 is fixedly connected to the first groove 432. The first drive disc 37 has a second groove 373, and the protrusion 371 is slidably disposed in the second groove 373. The protrusion 371 is connected to a compression spring 372, and the free end of the compression spring 372 is fixedly connected to the second groove 373. When the striking block 431 slides to its limit position, it contacts the air pump 42. When the protrusion 371 slides to its limit position, it is offset from the pressing pump 36. 10. Both the first groove 432 and the second groove 373 are provided with sliding grooves (not shown). The protrusion 371 and the striking block 431 are slidably connected to the sliding grooves in the first groove 432 and the second groove 373, respectively. The sliding grooves are used to provide positioning and guidance for the movement of the protrusion 371 and the striking block 431 under the action of centrifugal force. When the insulating oil enters the sampling chamber 31, the motor starts at high speed (e.g., 5000 rpm), and the second drive disc 43 rotates at high speed with the drive wheel 34. At this time, the striking block 431 in the first groove 432 slides to the limit position under the balance of centrifugal force and tension spring, striking the vacuum pump 42 to draw the sample chamber 31 under negative pressure (vacuum degree reaches 10 kPa), quickly removing more than 90% of the air bubbles in the oil within 15 seconds. Then the speed is reduced to 3000 rpm, and the centrifugal force weakens, causing the tension spring 433 to pull the striking block 431 back to the initial position of the first groove 432 and disengage it from the vacuum pump 42. At the same time, the protrusion 371 is squeezed by the change in centripetal force due to the restoring force of the compression spring 372 and the reduction in speed, thereby squeezing the press pump 36. At this time, under the action of negative pressure, the detection component is drawn in through the wedge-shaped sampling port, realizing the process of air bubble removal, metal separation and stratified sampling, so that the detection component obtains transformer oil samples with fewer air bubbles and low metal contamination, improving the accuracy of transformer oil detection.

[0041] The above descriptions are merely embodiments of this utility model, and common knowledge regarding specific structures and characteristics is not elaborated upon here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the structure of this utility model, and these should also be considered within the scope of protection of this utility model. These modifications will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application shall be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A device for determining trace moisture in oil products, comprising a chassis and a detection component disposed within the chassis, characterized in that, It also includes a sampling bottle, wherein the sampling bottle is provided with a sampling component, the sampling component comprising: A sampling chamber is located inside a sampling bottle and is connected to the sampling bottle via a pipe; A driving unit is used to drive the sampling chamber to rotate circumferentially; A sampling tube, one end of which is located in the sampling chamber and on the central axis of rotation of the sampling chamber, and the free end of which passes through the sampling chamber and is connected to the detection component.

2. The oil trace moisture determination device according to claim 1, characterized in that: The drive unit includes a motor and a drive wheel. The output shaft of the motor is coaxially and fixedly connected to the drive wheel. The sampling chamber is provided with a driven wheel. The drive wheel and the driven wheel are connected by belt drive.

3. The oil trace moisture determination device according to claim 2, characterized in that: The sampling bottle is provided with a liquid inlet, which is connected to a pipeline. The free end of the pipeline is located in the sampling chamber. The outer wall of the pipeline is in contact with the inner wall of the sampling chamber, and the free end of the pipeline extends to the bottom of the sampling chamber.

4. The oil trace moisture determination device according to claim 3, characterized in that: The sampling tube includes a first sampling tube and a second sampling tube. One end of the first sampling tube passes through the sampling chamber and is connected to the detection component. The first sampling tube is provided with a first sampling port. One end of the second sampling tube is located inside the free end of the first sampling tube. The second sampling tube is a flexible second sampling tube. The free end of the second sampling tube is provided with a float plate. The second sampling tube is provided with a second sampling port.

5. The oil trace moisture determination device according to claim 4, characterized in that: Both the first sampling port and the second sampling port are wedge-shaped structures, and both the first sampling port and the second sampling port are provided with sealing balls for sealing the first sampling port and the second sampling port. The sealing balls are connected to springs for resetting the sealing balls. The system also includes a sampling unit that is connected to the first sampling tube.

6. The oil trace moisture determination device according to claim 5, characterized in that: The sampling unit includes a press pump and a first drive disk. The first drive disk is coaxially and fixedly connected to the driven wheel. The first drive disk is provided with a protrusion for pressing the press pump. The inlet end of the press pump is connected to the first sampling tube, and the outlet end is connected to the detection component.

7. The oil trace moisture determination device according to claim 6, characterized in that: It also includes a defoaming component located inside the sampling bottle. The defoaming component includes an air extraction pipe and an air pump. The air extraction pipe is connected to the sampling chamber. The air inlet of the air pump is connected to the air extraction pipe. The air outlet of the air pump is located outside the sampling bottle. The drive wheel is coaxially fixedly connected to a second drive disk. The second drive disk is provided with a striking block for pressing the air pump.

8. The oil trace moisture determination device according to claim 7, characterized in that: The second drive disc has a first groove, and the striking block is slidably disposed in the first groove. The striking block is connected to a tension spring, and the free end of the tension spring is fixedly connected to the first groove. The first drive disc has a second groove, and the protrusion is slidably disposed in the second groove. The protrusion is connected to a compression spring, and the free end of the compression spring is fixedly connected to the second groove. When the striking block slides to its limit position, it contacts the air pump. When the protrusion slides to its limit position, it is offset from the pressing pump.

9. The oil trace moisture determination device according to claim 8, characterized in that: Both the first and second grooves are provided with sliding grooves, and the protrusion and the striking block are slidably connected to the sliding grooves in the first and second grooves, respectively.

10. The oil trace moisture determination device according to claim 9, characterized in that: Both the inlet and outlet ends of the air pump are equipped with one-way valves.

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