Double-coil detection device for distinguishing aliasing particles based on frequency conversion

Abstract

The utility model provides a double-coil detection device for distinguishing aliasing particles based on frequency conversion, which comprises a double-coil microfluid detection chip, a low-frequency alternating current excitation unit and a high-frequency current excitation unit, the double-coil microfluid detection chip comprises a glass substrate, a PDMS (Polydimethylsiloxane) substrate, a detection channel embedded in the PDMS substrate, a first solenoid and a second solenoid; holes are formed in the two ends of the detection channel respectively as a channel inlet and a channel outlet, and the detection channel penetrates through the centers of the first solenoid and the second solenoid respectively; two ends of a lead of the first solenoid are connected with the anode and the cathode of the low-frequency alternating-current excitation unit through insulated wires; the two ends of a lead of the second solenoid are connected with the positive electrode and the negative electrode of the high-frequency alternating current excitation unit through insulated wires, and due to the fact that eddy current effects generated by low frequency and high frequency on different particles are different, accurate distinguishing of different aliasing particles is achieved. The problem that a plurality of particles cannot be accurately identified when passing through a sensor detection area at the same time along with the increase of the detection flux of the oil detection device is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of oil state monitoring, and in particular to a double-coil detection device for distinguishing aliased particles based on frequency conversion. Background Art

[0002] Oil plays the role of transmitting power and lubricating in mechanical equipment, and is widely used in mechanical equipment. Gearbox is a key component of wind turbine. Long-term operation in such a harsh environment will produce metal abrasive particles after long-term meshing friction of the internal gear. Metal abrasive particles contaminate the lubrication system, which will cause the lubrication effect of the wind turbine gearbox to drop sharply. This will eventually lead to the shutdown of the entire wind turbine and cause huge economic losses. The lubricating oil in the gearbox is an indispensable factor to ensure the normal meshing operation of the gears. About 51% of gear failures are related to abnormal wear caused by insufficient lubrication. The characteristics of metal particles in the lubricant contain a lot of information about gearbox wear. Therefore, detecting metal particles in oil is crucial for condition monitoring and fault diagnosis of wind turbine gearboxes and extending the service life of wind turbines. Oil contaminants carry a lot of information about the operation of machinery and equipment. Therefore, the detection of hydraulic oil particle contaminants is of great significance for preventing and checking hydraulic machinery failures.

[0003] At present, the methods for detecting oil particle contaminants mainly include optical detection, acoustic detection, and capacitance detection. Compared with other detection methods, the inductance detection method has the advantages of being able to distinguish different metal particles, high sensitivity, simple structure, and reliable performance. However, it has the disadvantage of not being able to distinguish different aliased particles at the same time. Utility Model Content

[0004] Based on the above-mentioned technical problem that when the oil detection device increases with the detection flux, multiple particles cannot be accurately identified when passing through the sensor detection area at the same time, the utility model provides a dual-coil detection device for distinguishing aliased particles based on frequency conversion, wherein two solenoid coils are arranged as two detection units, and the detection channel passes through the two detection units, the first solenoid coil is set with a predetermined voltage and low-frequency AC excitation, and the second solenoid coil is set with a predetermined voltage and high-frequency AC excitation, because the eddy current effects of low frequency and high frequency on different particles are different, accurate distinction of different aliased particles is achieved.

[0005] The technical means adopted by the utility model are as follows:

[0006] A dual-coil detection device for distinguishing aliased particles based on frequency conversion includes: a dual-coil microfluidic detection chip, a low-frequency alternating current excitation unit and a high-frequency galvanic excitation unit, wherein:

[0007] The double-coil microfluidic detection chip comprises a glass substrate, a PDMS substrate arranged on the glass substrate, a detection channel embedded in the PDMS substrate, and two inductance detection units; wherein:

[0008] The detection channel has openings at both ends, serving as a channel entrance and a channel exit respectively. The two inductance detection units are a first solenoid and a second solenoid respectively. The detection channel passes through the center of the first solenoid and the second solenoid respectively.

[0009] The two ends of the lead of the first solenoid are connected to the positive and negative poles of the low-frequency AC excitation unit through an insulated wire; the two ends of the lead of the second solenoid are connected to the positive and negative poles of the high-frequency AC excitation unit through an insulated wire. Since the eddy current effects of low frequency and high frequency on different particles are different, accurate distinction between different aliased particles can be achieved.

[0010] Furthermore, the low-frequency AC excitation unit is used to provide a predetermined voltage and low-frequency AC excitation to the first solenoid; and the high-frequency AC excitation unit is used to provide a predetermined voltage and high-frequency AC excitation to the second solenoid.

[0011] Furthermore, the inner diameters of the first solenoid and the second solenoid are both larger than the inner diameter of the detection channel.

[0012] Furthermore, the first solenoid and the second solenoid are both wound by enameled wire, each having 50 turns, an inner diameter greater than 3500 microns, and an outer diameter greater than 4000 microns.

[0013] Furthermore, the inner diameter of the detection channel is less than 3500 microns.

[0014] Compared with the prior art, the utility model has the following advantages:

[0015] The utility model provides a dual-coil detection device for distinguishing aliased particles based on frequency conversion, which sets two solenoid coils as two detection units, and passes the detection channel through the two detection units. The first solenoid coil is set with a predetermined voltage and low-frequency AC excitation, and the second solenoid coil is set with a predetermined voltage and high-frequency AC excitation. Since the eddy current effects of low frequency and high frequency on different particles are different, accurate distinction of different aliased particles is achieved. It is of great significance to the prevention and diagnosis of ship machinery equipment failures.

[0016] Based on the above reasons, the utility model can be widely promoted in the fields of marine machinery equipment failure prevention and diagnosis. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0018] Figure 1 This is a structural diagram of the double-coil microfluidic detection chip of the utility model.

[0019] Figure 2 It is a structural schematic diagram of a dual-coil detection device for distinguishing aliased particles based on frequency conversion according to the utility model.

[0020] In the figure: 1. glass substrate; 2. PDMS matrix; 3. channel inlet; 4. channel outlet; 5. detection channel; 6. first solenoid; 7. second solenoid; 8. low-frequency AC excitation unit; 9. high-frequency galvanic excitation unit. DETAILED DESCRIPTION

[0021] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0022] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings 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. The following description of at least one exemplary embodiment is actually only illustrative and is by no means a limitation on the utility model and its application or use. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0023] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the utility model. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0024] Unless otherwise specifically stated, the relative arrangement of the parts and steps described in these embodiments, the numerical expressions and numerical values ​​do not limit the scope of the utility model. At the same time, it should be clear that, for ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be regarded as part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0025] In the description of the present utility model, it needs to be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present utility model and simplifying the description. Unless otherwise stated, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present utility model: the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0026] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below their position devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0027] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the utility model.

[0028] The utility model provides a dual-coil detection device for distinguishing aliased particles based on frequency conversion, comprising: a dual-coil microfluidic detection chip, a low-frequency alternating current excitation unit 8 and a high-frequency galvanic excitation unit 9, wherein:

[0029] like Figure 1 As shown, the double-coil microfluidic detection chip comprises a glass substrate 1, a PDMS substrate 2 disposed on the glass substrate 1, a detection channel 5 embedded in the PDMS substrate 2, and two inductance detection units; wherein:

[0030] The detection channel 5 has openings at both ends, serving as a channel entrance 3 and a channel exit 4 respectively. The two inductance detection units are a first solenoid 6 and a second solenoid 7 respectively. The detection channel 5 passes through the center of the first solenoid 6 and the second solenoid 7 respectively.

[0031] like Figure 2 As shown, the two ends of the lead of the first solenoid 6 are connected to the positive and negative electrodes of the low-frequency AC excitation unit through an insulated wire; the two ends of the lead of the second solenoid 7 are connected to the positive and negative electrodes of the high-frequency AC excitation unit through an insulated wire. Since the eddy current effects of low frequency and high frequency on different particles are different, accurate distinction between different aliased particles can be achieved.

[0032] When implementing the invention, please refer to the following as the preferred embodiment of the invention. Figure 2 The low-frequency AC excitation unit is used to give the first solenoid 6 a predetermined voltage and low-frequency AC excitation; the high-frequency AC excitation unit is used to give the second solenoid 7 a predetermined voltage and high-frequency AC excitation.

[0033] In specific implementation, as a preferred embodiment of the present invention, the inner diameters of the first solenoid 6 and the second solenoid 7 are larger than the inner diameter of the detection channel 5 .

[0034] In specific implementation, as a preferred embodiment of the utility model, the first solenoid 6 and the second solenoid 7 are both wound by enameled wire, both have 50 turns, both have inner diameters less than 3500 microns, and both have outer diameters greater than 4000 microns.

[0035] In a specific implementation, as a preferred embodiment of the present invention, the inner diameter of the detection channel 5 is less than 3500 microns.

[0036] In specific implementation, as a preferred embodiment of the present invention, the PDMS substrate 2 is made of polydimethylsiloxane material by molding.

[0037] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. A dual-coil detection device for distinguishing aliased particles based on frequency conversion, characterized in that: include: A double-coil microfluidic detection chip, a low-frequency alternating current excitation unit (8) and a high-frequency galvanic excitation unit (9), wherein: The double-coil microfluidic detection chip comprises a glass substrate (1), a PDMS substrate (2) arranged on the glass substrate (1), a detection channel (5) embedded in the PDMS substrate (2), and two inductance detection units; wherein: The detection channel (5) has openings at both ends, which serve as a channel entrance (3) and a channel exit (4), respectively. The two inductance detection units are a first solenoid (6) and a second solenoid (7), respectively. The detection channel (5) passes through the center of the first solenoid (6) and the second solenoid (7), respectively. The two ends of the lead wire of the first solenoid (6) are connected to the positive and negative electrodes of the low-frequency alternating current excitation unit through an insulated wire; the two ends of the lead wire of the second solenoid (7) are connected to the positive and negative electrodes of the high-frequency alternating current excitation unit through an insulated wire. Since the eddy current effects of low frequency and high frequency on different particles are different, accurate distinction between different aliased particles is achieved.

2. A dual-coil detection device for distinguishing aliased particles based on frequency conversion according to claim 1, characterized in that: The low-frequency AC excitation unit is used to provide a predetermined voltage and low-frequency AC excitation to the first solenoid (6); and the high-frequency AC excitation unit is used to provide a predetermined voltage and high-frequency AC excitation to the second solenoid (7).

3. A dual-coil detection device for distinguishing aliased particles based on frequency conversion according to claim 1, characterized in that: The inner diameters of the first solenoid (6) and the second solenoid (7) are both larger than the inner diameter of the detection channel (5).

4. A dual-coil detection device for distinguishing aliased particles based on frequency conversion according to claim 1, characterized in that: The first solenoid (6) and the second solenoid (7) are both wound by enameled wire, each having 50 turns, an inner diameter greater than 3500 microns, and an outer diameter greater than 4000 microns.

5. A dual-coil detection device for distinguishing aliased particles based on frequency conversion according to claim 1, characterized in that: The inner diameter of the detection channel (5) is less than 3500 microns.

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