A lubricating oil filter for gas turbine

Abstract

The invention discloses a lubricating oil filter for a gas turbine, comprising a lubricating oil outlet pipe for guiding the lubricating oil to flow out of the lubricating oil filter, a lubricating oil inlet pipe for guiding the lubricating oil to enter the lubricating oil filter, a filter screen for filtering the lubricating oil flowing through the lubricating oil filter, the filter screen being arranged between the lubricating oil inlet pipe and the lubricating oil outlet pipe, the filter screen being attached with debris obtained by filtering the lubricating oil, and the lubricating oil filter further comprising a detection device for detecting the debris attached to the filter screen. By detecting the debris attached to the filter screen, the situation of the debris in the lubricating oil can be detected, and then the possible failure of the mechanical structure of the gas turbine can be timely known.

Description

Technical Field

[0001] The invention relates to the field of gas turbines, and in particular to a lubricating oil filter of a gas turbine. Background Art

[0002] During the operation of the gas turbine, in order to ensure the normal operation of the rotor and bearings and avoid wear, a lubricating oil system is usually set up in the gas turbine. The lubricating oil flows through the working position of the rotor and bearing through the lubricating oil system, thereby achieving the lubrication effect. The rotor and bearing may generate chips during operation, and a lubricating oil filter is usually set up in the lubricating oil system to filter the metal chips and large non-magnetic metal chips in the lubricating oil system through the lubricating oil filter, thereby preventing the above chips from affecting the normal operation of the gas turbine.

[0003] When the mechanical structures such as rotors and bearings in a gas turbine fail, the gas turbine may be worn out and generate a large amount of shavings once it is operated under the fault. In the prior art, there is a technical solution for detecting whether the mechanical structure of the gas turbine fails by real-time detecting the amount of metal shavings in the lubricating oil system. However, when detecting the amount of metal shavings in the prior art, the amount of metal shavings in the lubricating oil is directly detected by setting a detection element in the lubricating oil system. The solution for detecting the amount of metal shavings has nothing to do with the lubricating oil filter, and the lubricating oil filter can only achieve the effect of simply filtering metal shavings.

[0004] For example, the existing patent CN102147230A discloses a micro-inductor sensor for detecting metal debris in oil, which includes a three-way pipe joint, a piston, a micro-coil, a PCB board, a welding wire, a bonding lead and an insulating layer. During measurement, the LCR digital measuring instrument connects an alternating current to the micro-coil. When ferromagnetic metal debris passes through, the magnetic permeability is much greater than 1, which greatly enhances the magnetic field. The inductance change caused by the eddy current effect is relatively small, so the measured inductance of the micro-coil increases. The change in the inductance value of the micro-coil is used to judge the size of the metal debris. However, the metal debris will be scattered at different positions in the lubricating oil pipeline. If a micro-coil is set somewhere in the pipeline, if the metal debris does not flow through this position but is scattered at other positions, it is difficult for the micro-coil to sense it, resulting in inaccurate detection.

[0005] The existing patent CN103278560A discloses a simulation detection device for metal debris in flowing oil. The air pressure speed control circuit provides power to make the oil pool piston located in the upper oil pool compress the oil in the oil pipeline to move. The micro-inductor eddy current sensor is fixedly connected to the two three-way joints in the oil pipeline and detects the suspended metal debris immersed in the oil at different positions. The detection signal is recorded by two impedance analyzers and transmitted to the computer for processing. Although this patent uses air pressure to make the oil move, metal chips may still be left in the position where the detection device is not set in the lubricating oil pipeline, resulting in inaccurate detection. In fact, a large amount of metal chips in the lubricating oil system will be attached to the lubricating oil filter. Therefore, there is currently a lack of a lubricating oil filter that can detect the amount of metal chips in the lubricating oil in real time.

[0006] In view of the above technical problems, the present invention is proposed. Summary of the invention

[0007] The main purpose of the present invention is to provide a lubricating oil filter for a gas turbine to solve the problem that the prior art cannot use the lubricating oil filter to detect the amount of metal chips in the lubricating oil in real time.

[0008] In order to achieve the above-mentioned object, according to one aspect of the present invention, a lubricating oil filter for a gas turbine is provided, comprising a lubricating oil outlet pipe for guiding the lubricating oil to flow out of the lubricating oil filter, a lubricating oil inlet pipe for guiding the lubricating oil to enter the lubricating oil filter, a filter screen for filtering the lubricating oil flowing through the lubricating oil filter, the filter screen being arranged between the lubricating oil inlet pipe and the lubricating oil outlet pipe, the filter screen being attached with debris obtained by filtering the lubricating oil, and the lubricating oil filter further comprising a detection device for detecting the debris attached to the filter screen. The debris in the lubricating oil will be attached to the filter screen of the lubricating oil filter, and by detecting the debris attached to the filter screen, the situation of the debris in the lubricating oil can be known, and then whether the mechanical structure in the gas turbine fails during operation can be known.

[0009] Furthermore, the detection device includes a measuring circuit, and the measuring circuit is configured as a circuit whose current characteristic parameter changes with the change of the amount of metal chips attached to the filter. The present invention can detect the situation of chips in the lubricating oil by detecting the change of the amount of metal chips attached to the filter through the measuring circuit.

[0010] Furthermore, the measuring device also includes an insulating housing, and the measuring circuit is arranged in the insulating housing. By providing the insulating housing to shield and protect the measuring circuit, when installing the measuring circuit, it is only necessary to arrange the insulating housing in the pipeline through which the lubricating oil flows, without insulating the pipeline.

[0011] Furthermore, the filter screen and the insulating shell are sequentially arranged in the pipeline through which the lubricating oil flows along the direction of the lubricating oil flow. The filter screen and the insulating shell are sequentially arranged along the axial direction in the pipeline through which the lubricating oil flows, so that the radial space of the pipeline occupied by the filter screen and the insulating shell is small, saving space.

[0012] Furthermore, the filter is configured as a trumpet-shaped cylinder that gradually narrows along the direction of the lubricating oil flow, and the wider end of the trumpet-shaped cylinder-shaped filter is provided with an opening, and the other end is closed; the insulating housing is provided adjacent to the closed end of the filter. The structure of the filter facilitates the expansion of the area contacting the lubricating oil and achieves a better filtering effect. In addition, the arrangement position of the filter and the insulating housing facilitates the measurement circuit to contact the filter and detect the metal chips attached to the filter.

[0013] Furthermore, the radial width of the opening of the filter is a first width, the radial width of the pipeline where the lubricating oil filter is located is a second width, and the first width is equal to the second width. The radial width of the opening of the filter is equal to the radial width of the pipeline, so that the opening of the filter runs through the pipeline through which the lubricating oil flows, and the lubricating oil flowing through the cross section of the pipeline can be filtered by the filter.

[0014] Furthermore, the maximum radial width of the insulating shell is the third width, the radial width of the closed end of the filter is the fourth width, and the third width is equal to the fourth width.

[0015] Furthermore, the filter screen and the insulating shell are arranged in the installation pipe; the two ends of the installation pipe are respectively connected to the lubricating oil outlet pipe and the lubricating oil inlet pipe. When installing the lubricating oil filter, it is only necessary to connect the installation pipe to the lubricating oil outlet pipe and the lubricating oil inlet pipe, which is convenient for installation.

[0016] Furthermore, the installation pipeline is detachably connected to the lubricating oil outlet pipe and the lubricating oil inlet pipe, so that the lubricating oil filter can be easily removed and the filter screen of the lubricating oil filter can be replaced.

[0017] Furthermore, an oil through hole for the lubricating oil to flow through is provided in the installation pipeline, so that the lubricating oil can flow through the lubricating oil filter through the oil through the oil through hole.

[0018] Furthermore, the measuring circuit includes a coil arranged close to the filter screen, and the impedance of the coil changes with the amount of metal chips attached to the filter screen. The change in the amount of metal chips attached to the filter screen is sensed by the coil, so that the measuring circuit structure is simple and easy to process.

[0019] Furthermore, a plurality of coils are arranged in the measuring circuit.

[0020] Furthermore, the measuring circuit includes a printed circuit board, and the printed circuit board is connected to the coil via a wire. The measuring circuit can be adjusted via the printed circuit board.

[0021] Furthermore, a current measuring element for real-time detection of the current of the measuring circuit is provided in the printed circuit board. By providing the current measuring element in the printed circuit board, it is convenient to detect the current of the measuring circuit.

[0022] Furthermore, the lubricating oil filter includes a shielded cable for supplying power to the measuring circuit, and the shielded cable is connected to the printed circuit board.

[0023] Furthermore, the shielded cable is inserted into a pipeline through which the lubricating oil flows and is connected to the printed circuit board. A sealing plug is provided at the position where the shielded cable is inserted into the pipeline through which the lubricating oil flows.

[0024] Furthermore, a sealing plug is provided at the end of the insulating housing for inserting the shielded cable. The sealing plug ensures the sealing of the lubricating oil pipeline.

[0025] The detection device for detecting the debris attached to the filter screen is provided in the lubricating oil filter for the gas turbine of the present invention, which has the following advantages:

[0026] 1. The debris will gather at the filter screen of the lubricating oil filter. A detection device for detecting the debris attached to the filter screen is set in the lubricating oil filter, which can more accurately obtain the debris situation in the pipeline where the lubricating oil flows, and then timely detect and discover the mechanical structure operation failure of the gas turbine.

[0027] 2. In the lubricating oil filter of the present invention, the amount of metal chips attached to the filter screen is detected by a measuring circuit to obtain the chip content in the lubricating oil flowing through the pipeline. The setting structure of the measuring circuit is relatively simple, and the metal chips can be sensed by only setting a coil.

[0028] 3. The present invention sets the measuring circuit in an insulating housing so that the measuring circuit can obtain insulation isolation protection, and then the pipeline does not need to be insulated during installation, which is convenient for installation. In addition, the present invention sets the lubricating oil filter in the installation pipeline, so that the installation can be completed by simply inserting the installation pipeline into the pipeline through which the lubricating oil flows, without modifying the pipeline through which the lubricating oil flows, which is convenient for installation.

[0029] 4. Sealing plugs are provided at the locations where the shielded power supply cables in the measuring circuit of the present invention are connected to the pipelines, thereby ensuring sealing. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0031] Figure 1 A schematic cross-sectional view of a lubricating oil filter of a gas turbine according to the present invention is shown.

[0032] An isometric schematic diagram of a lubricating oil filter for a gas turbine according to the present invention is shown.

[0033] The above drawings include the following reference numerals:

[0034] 1. Lubricating oil outlet pipe; 2. Lubricating oil inlet pipe; 3. Filter; 4. Insulating shell; 5. Opening; 6. Closed end; 7. Mounting pipe; 8. Oil hole; 9. Coil; 10. Printed circuit board; 11. Wire; 12. Shielded cable; 13. Sealing plug. DETAILED DESCRIPTION

[0035] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments 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.

[0036] The present invention is further described in detail below in conjunction with specific embodiments. These embodiments should not be construed as limiting the scope of protection claimed by the present invention.

[0037] A lubricating oil system is usually provided in a gas turbine to provide lubricating oil to the rotors, bearings and other mechanical structures that need to rotate in the gas turbine. However, the above-mentioned rotating mechanical structures may generate debris during operation. If these debris flow into some mechanical structures of the gas turbine, it may affect the normal operation of the gas turbine. Therefore, a lubricating oil filter should be provided in the lubricating oil system of the gas turbine to filter the debris in the lubricating oil system. Specifically, the lubricating oil filter of the gas turbine includes a lubricating oil outlet pipe 1 for guiding the lubricating oil to flow out of the lubricating oil filter, a lubricating oil inlet pipe 2 for guiding the lubricating oil to enter the lubricating oil filter, and a filter screen 3 for filtering the lubricating oil flowing through the lubricating oil filter. The filter screen 3 is provided between the lubricating oil inlet pipe 2 and the lubricating oil outlet pipe 1. That is, the lubricating oil filter mainly filters the debris in the lubricating oil system through the filter screen 3.

[0038] If the rotating mechanical structure of the gas turbine fails, the rotating mechanical structures will be in abnormal contact with each other, which will generate a large amount of debris. In the prior art, there is a technical solution for determining whether the rotating machinery of the gas turbine fails by detecting the amount of debris in the lubricating oil system. However, the detection device is mainly set at a position set in the lubricating oil system to detect the amount of debris in the lubricating oil pipeline. However, since the debris may flow in any direction in the pipeline, and some of the debris may fall at different positions in the pipeline, it is not accurate to determine whether the rotating machinery fails by only detecting the debris in the lubricating oil flowing in the pipeline.

[0039] Therefore, the present invention proposes to set a device for detecting the amount of debris in the lubricating oil filter to determine whether the rotating machinery has a fault. Since the debris dispersed in the lubricating oil system will gather at the lubricating oil filter, the debris content in the lubricating oil system can be more accurately reflected by detecting the debris at the lubricating oil filter. Compared with the previous method of setting a device for detecting the debris content in the lubricating oil flowing through a specific position in the pipeline through which the lubricating oil flows in the lubricating oil system, it can more accurately reflect the debris content in the lubricating oil system. Specifically, the debris obtained by filtering the lubricating oil is attached to the filter screen 3 of the lubricating oil filter, and the lubricating oil filter also includes a detection device for detecting the debris attached to the filter screen 3. Since a large amount of debris will be attached to the filter screen 3, the amount of debris on the filter screen 3 is detected, which is convenient for the detection of the detection device and can more accurately reflect the situation of debris in the lubricating oil system.

[0040] like Figure 1 As shown in , the present invention mainly detects the metal chips by measuring the circuit. Specifically, the measuring circuit is configured as a circuit whose current characterization parameters change with the change of the amount of metal chips attached to the filter 3. Since the parameters of the circuit such as current and voltage are relatively convenient to measure, and the metal chips themselves are magnetic, based on the principle of electromagnetic induction, the change of the amount of metal chips will inevitably cause the change of the voltage, current, etc. of the measuring circuit, and the voltage, current, etc. of the measuring circuit are relatively sensitive, so the present invention proposes to detect the amount of metal chips attached to the filter 3 by measuring the circuit. The measuring circuit can be set to any form of circuit sensitive to electromagnetic induction, so as to reflect the amount of metal chips attached to the filter 3 by detecting the current value of the measuring circuit.

[0041] Specifically, the measuring circuit of the present invention includes a coil 9 arranged close to the filter 3, and the impedance of the coil 9 changes with the amount of metal chips attached to the filter 3. When the amount of magnetic metal chips attached to the filter 3 changes, the magnetic permeance will change, and the magnetic permeance is proportional to the impedance of the coil 9, that is, the amount of metal chips attached to the filter 3 will change. The impedance of the coil 9 changes, and then the current of the measuring circuit changes. By setting the coil 9, the measuring circuit of the present invention can use the sensitive reaction of the coil 9 to the change of the magnetic field to accurately detect the amount of metal chips attached to the filter 3, and the setting of the measuring circuit is relatively simple. The measuring circuit can also be set by setting multiple groups of coils 9 to detect the amount of metal chips attached to the filter 3. By setting multiple groups of coils 9, the influence of the amount of metal chips attached to the filter 3 on the impedance of the measuring circuit can be amplified, thereby improving the sensitivity of the detection circuit to the metal chips attached to the filter 3.

[0042] like Figure 1As shown in , the measuring circuit includes a printed circuit board 10, and the printed circuit board 10 is connected to the coil 9 through a wire 11. The specific structure of the measuring circuit can be adjusted by the printed circuit board 10, and then the functional relationship between the current of the measuring circuit and the metal shavings attached to the filter 3 can be adjusted, so that the functional relationship can be adjusted to facilitate the calculation of the current of the measuring circuit. Preferably, a current measuring element for real-time detection of the current of the measuring circuit is set in the printed circuit board 10, so that the current value of the measuring circuit can be obtained in time without an external ammeter or other device.

[0043] The above-mentioned measuring circuit needs to be in a shielded environment and needs to be isolated from lubricating oil, etc., to avoid interference from other signals to the measuring circuit and affect the accuracy of the current of the measuring circuit, and to avoid damage to the measuring circuit after the lubricating oil, etc. enters the measuring circuit. Therefore, the measuring device of the present application also includes an insulating housing 4, and the measuring circuit is arranged in the insulating housing 4. In this way, when installing the lubricating oil filter in the pipeline through which the lubricating oil flows, it is only necessary to set the insulating housing 4 in the pipeline, and there is no need to shield the pipeline through which the lubricating oil flows, which is easy to install. If the measuring circuit is not set in the insulating housing, the pipeline needs to be insulated when installing the measuring circuit.

[0044] As for the pipeline, the diameter is usually much smaller than its axial length, so in order to save the radial space of the pipeline, the filter screen 3 and the insulating shell 4 can be arranged in sequence in the pipeline through which the lubricating oil flows along the direction of the lubricating oil flow. That is, if the filter screen 3 and the insulating shell 4 are arranged in sequence and adjacent to each other along the axial direction of the lubricating oil pipeline, the filter screen 3 and the insulating shell 4 have an overlapping area along the axial direction of the pipeline, so that the radial space in the pipeline occupied by the filter screen 3 and the insulating shell 4 is small, thereby saving the radial space in the pipeline.

[0045] like Figure 1 As shown in , the specific structure of the filter 3 is set as follows: the filter 3 is set as a trumpet-shaped cylinder that gradually narrows along the direction of the lubricating oil flow, and the wider end of the trumpet-shaped cylinder-shaped filter 3 is provided with an opening 5, and the other end is closed. The filter 3 is set as a trumpet-shaped cylinder structure, which is conducive to guiding the lubricating oil to flow through the filter 3. Preferably, the insulating shell 4 is arranged adjacent to the closed end 6 of the filter 3. Since the metal chips attached to the filter 3 are mainly located at the closed end 6 of the filter 3, the insulating shell 4 is arranged adjacent to the closed end 6, so that the measuring circuit in the insulating shell 4 can detect the metal chips attached to the filter 3.

[0046] Further preferably, the radial width of the opening 5 of the filter 3 is equal to the radial width of the pipeline through which the lubricating oil flows, that is, the radial width of the opening 5 of the filter 3 is the first width, the radial width of the pipeline where the lubricating oil filter is located is the second width, and the first width is equal to the second width. It is ensured that the opening of the filter 3 intercepts the entire cross-section of the pipeline through which the lubricating oil flows, thereby ensuring that the lubricating oil flowing through the pipeline at that position is filtered by the filter 3.

[0047] Further preferably, the maximum radial width of the insulating housing 4 is the third width, the radial width of the closed end 6 of the filter screen 3 is the fourth width, and the third width is equal to the fourth width. Since the main purpose of providing the insulating housing 4 is to accommodate the measuring circuit, and the measuring circuit is used to detect the amount of metal chips attached to the filter screen 3, the measuring circuit and the insulating housing 4 need to be mainly arranged near the position of the metal chips attached to the filter screen 3. Figure 1 As shown in , the metal chips are mainly concentrated at the closed end 6 of the filter 3, so the radial extension width of the measuring circuit only needs to be equal to the radial width of the closed end 6 of the filter 3. Therefore, in order to save materials, the maximum radial width of the insulating housing 4 with the measuring circuit inside only needs to be equal to the radial width of the closed end 6 of the filter 3.

[0048] like Figure 1 As shown in , in order to facilitate the installation of the lubricating oil filter, the lubricating oil filter can be set in the installation pipe 7. In this way, when installing the lubricating oil filter, it is only necessary to plug the installation pipe 7 into the pipe through which the lubricating oil flows. Specifically, the filter screen 3 and the insulating shell 4 are set in the installation pipe 7; the two ends of the installation pipe 7 are respectively connected to the lubricating oil outlet pipe 1 and the lubricating oil inlet pipe 2. Preferably, the diameter of the installation pipe 7 can be set to be consistent with the diameter of the pipe through which the lubricating oil flows. In this way, the process of installing the lubricating oil filter is actually equivalent to extending the pipe through which the lubricating oil flows for a certain distance.

[0049] Further preferably, the installation pipe 7 is detachably connected to the lubricating oil outlet pipe 1 and the lubricating oil inlet pipe 2. Figure 1 As shown in the figure, the installation pipe 7 can be connected to the outer wall of the lubricating oil inlet pipe 2 and the lubricating oil outlet pipe 1 by bolts, which is convenient for the assembly and removal of the installation pipe 7 and the lubricating oil inlet pipe 2 and the lubricating oil outlet pipe 1. By removing the installation pipe 7, the filter 3 can be easily taken out and replaced. The installation pipe 7, the lubricating oil outlet pipe 1 and the lubricating oil inlet pipe 2 can also be connected by other structures that are convenient for installation and disassembly, such as buckles. And because the installation pipe 7 has an insulating shell 4, the lubricating oil inlet pipe 2 and the lubricating oil outlet pipe 1 connected to the installation pipe 7 do not need to be insulated or sealed, and only need to be connected by bolts, which is convenient for installation.

[0050] Since the function of the installation pipe 7 is to install the lubricating oil filter, except for the filter screen 3 which needs to be connected to the pipe through which the lubricating oil flows, the other positions of the lubricating oil filter are preferably set as a closed structure, and the lubricating oil needs to flow through the installation pipe 7. Therefore, it is preferred that an oil through hole 8 for the lubricating oil to flow through is set in the installation pipe 7, and the lubricating oil can easily pass through the installation pipe 7 through the oil through hole 8.

[0051] The measuring circuit needs a cable for power supply. In order to ensure the shielding of the measuring circuit, the preferred cable is a shielded cable 12. In order to power the measuring circuit, the shielded cable 12 needs to first penetrate into the pipeline through which the lubricating oil flows, and then penetrate into the insulating housing 4, and finally be connected to the printed circuit board to power the measuring circuit. In order to ensure the sealing of the pipeline through which the lubricating oil flows and the insulating housing 4, a sealing plug 13 is provided at the position where the shielded cable 12 passes. Specifically, the shielded cable 12 is inserted into the pipeline through which the lubricating oil flows and is connected to the printed circuit board 10, and a sealing plug 13 is provided at the position where the shielded cable 12 is inserted in the pipeline through which the lubricating oil flows. A sealing plug 13 is provided at the end of the insulating housing 4 where the shielded cable 12 is inserted. That is, the lubricating oil filter of the gas turbine provided by the present invention not only ensures the sealing through the insulating housing 4 and the installation pipeline 7, but also further ensures the sealing of the threading position through the sealing plug 13.

[0052] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:

[0053] 1. The present invention sets a detection device in the lubricating oil filter that can detect the debris attached to the filter screen, and can detect the debris at the location where the debris is concentrated in the pipeline through which the lubricating oil passes, which can more accurately reflect the actual situation of the debris in the pipeline through which the lubricating oil flows. Compared with the previous detection of debris in the lubricating oil flowing in the pipeline, since the debris may be scattered at any location during the flow process, resulting in inaccurate detection, the present application detects at the location where the debris is concentrated, which can more accurately reflect the situation of the debris in the pipeline. In addition, by detecting the debris content in the pipeline, the abnormal situation of the debris content in the pipeline can be discovered in time, and then the situation of mechanical operation failure of the gas turbine can be known.

[0054] 2. The lubricating oil filter internal detection device of the present invention reacts to the amount of metal chips attached to the filter screen through a measuring circuit. Only a coil is required in the measuring circuit, and the impedance can be changed by the coil as the amount of metal chips attached to the filter screen changes, thereby causing the current to change. The measuring circuit has a simple structure and is sensitive to changes in the amount of metal chips attached to the filter screen.

[0055] 3. The present invention sets the measuring circuit in an insulating housing, which can ensure that the measuring circuit will not be interfered by external signals and the like, and ensure that the measuring circuit will not be affected by the inflow of lubricating oil. When installing the measuring circuit, it is only necessary to set the insulating housing in the pipeline through which the lubricating oil flows, and there is no need to seal or insulate the pipeline through which the lubricating oil flows, which is convenient for installation.

[0056] 4. The present invention sets the lubricating oil filter in the installation pipe, so when installing the lubricating oil filter, the lubricating oil filter can be assembled by simply connecting the installation pipe with the original pipe, and the splicing connection between pipes is relatively convenient. And when the filter needs to be cleaned or replaced, the installation pipe and the original pipe through which the lubricating oil flows can be easily removed.

[0057] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A lubricating oil filter for a gas turbine, comprising a lubricating oil outlet pipe (1) for guiding lubricating oil to flow out of the lubricating oil filter, a lubricating oil inlet pipe (2) for guiding lubricating oil to enter the lubricating oil filter, and a filter screen (3) for filtering lubricating oil flowing through the lubricating oil filter, wherein the filter screen (3) is arranged between the lubricating oil inlet pipe (2) and the lubricating oil outlet pipe (1), and is characterized in that: The filter screen (3) has scraps obtained by filtering the lubricating oil attached to it. The lubricating oil filter further comprises a detection device for detecting the scraps attached to the filter screen (3). The detection device comprises a measuring circuit. The measuring circuit is configured as a circuit in which a current characterizing parameter changes with a change in the amount of metal scraps attached to the filter screen (3). The measuring circuit comprises a coil (9) arranged close to the filter screen (3). The impedance of the coil (9) changes with a change in the amount of metal scraps attached to the filter screen (3). The detection device further comprises an insulating housing (4), wherein the measurement circuit is arranged in the insulating housing (4). The filter screen (3) and the insulating housing (4) are arranged in sequence in the pipeline through which the lubricating oil flows, along the direction of the lubricating oil flow. The filter screen (3) is configured as a trumpet-shaped cylinder that gradually narrows along the direction of the flow of the lubricating oil; the wider end of the trumpet-shaped cylinder-shaped filter screen (3) is provided with an opening (5), and the other end is closed; The insulating housing (4) is disposed adjacent to the closed end (6) of the filter screen (3). The filter screen (3) and the insulating housing (4) are arranged in a mounting pipe (7); two ends of the mounting pipe (7) are respectively connected to the lubricating oil outlet pipe (1) and the lubricating oil inlet pipe (2). The installation pipe (7) is detachably connected to the lubricating oil outlet pipe (1) and the lubricating oil inlet pipe (2). An oil through hole (8) for lubricating oil to flow through is provided in the installation pipe (7).

2. The lubricating oil filter according to claim 1, characterized in that: The radial width of the opening of the filter screen (3) is a first width, the radial width of the pipeline where the lubricating oil filter is located is a second width, and the first width is equal to the second width.

3. The lubricating oil filter according to claim 2, characterized in that: The maximum radial width of the insulating shell (4) is a third width, the radial width of the closed end (6) of the filter screen (3) is a fourth width, and the third width is equal to the fourth width.

4. The lubricating oil filter according to claim 1, characterized in that: A plurality of groups of coils (9) are arranged in the measurement circuit.

5. The lubricating oil filter according to claim 4, characterized in that: The measuring circuit comprises a printed circuit board (10), and the printed circuit board (10) is connected to the coil (9) via a wire (11).

6. The lubricating oil filter according to claim 5, characterized in that: A current measuring element for detecting the current of the measuring circuit in real time is arranged in the printed circuit board (10).

7. The lubricating oil filter according to claim 5, characterized in that: The lubricating oil filter comprises a shielded cable (12) for supplying power to the measuring circuit, and the shielded cable (12) is connected to the printed circuit board (10).

8. The lubricating oil filter according to claim 7, characterized in that: The shielded cable (12) is inserted into the pipeline through which the lubricating oil flows and is connected to the printed circuit board (10); a sealing plug (13) is provided at the position in the pipeline through which the lubricating oil flows where the shielded cable (12) is inserted.

9. The lubricating oil filter according to claim 7, characterized in that: A sealing plug (13) is provided at the end of the insulating housing (4) into which the shielded cable (12) is inserted.

Images