A refueling detection device, a gas roots flowmeter and a refueling detection method thereof

Abstract

The present application relates to a kind of oiling detection device, gas Roots flowmeter and oiling detection method.Solve the existing technology in the gas Roots flowmeter in use, due to maintenance is not timely, often appear because of the lack of lubricating oil, metamorphism, leading to the wear of shaft, bearing, thereby influence measurement accuracy, even appear the phenomenon of jamming problem.Oiling detection device includes control module, oil level detection infrared receiving tube connected with control module, oil level detection infrared emitting tube, oil quality detection infrared receiving tube, oil quality detection infrared emitting tube, and left to right sequentially connected transmission and reflection piece, refraction and reflection piece and sheath, by the difference of infrared emitted and received light signal information, to realize the detection of oil level and oil quality;The present application also proposes a kind of gas Roots flowmeter based on oiling detection device and oiling detection method.

Description

Technical Field

[0001] This invention relates to flow meters, specifically to a refueling detection device, a gas Roots flow meter, and a refueling detection method. Background Technology

[0002] Gas Roots flow meters are volumetric instruments. Due to their wide range, low starting flow, high measurement accuracy, low pressure loss, and good repeatability, they are widely used for flow measurement of gases such as natural gas, coal gas, inert gases, and air. They are ideal flow metering devices for cities and oilfields both domestically and internationally.

[0003] When using gas roots flow meters, if maintenance is not timely, the lack or deterioration of lubricating oil often leads to wear of the shaft and bearings, which affects the metering accuracy and may even cause jamming. However, existing gas roots flow meters do not have the function of monitoring the lack or deterioration of lubricating oil. Summary of the Invention

[0004] The purpose of this invention is to solve the technical problem that existing gas roots flow meters often experience wear on shafts and bearings due to insufficient or deteriorated lubricating oil caused by untimely maintenance, which affects measurement accuracy and may even lead to jamming. The invention provides a lubrication detection device, a gas roots flow meter, and a lubrication detection method.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0006] A refueling detection device, which is special in that:

[0007] It includes a control module, an infrared receiver tube for oil level detection, an infrared transmitter tube for oil level detection, an infrared receiver tube for oil quality detection, and an infrared transmitter tube for oil quality detection, as well as a transmission and reflection component, a refraction and reflection component, and a sheath connected from front to back.

[0008] The rear end of the oil quality detection infrared receiver tube, the rear end of the oil quality detection infrared transmitter tube, the control module, the oil level detection infrared receiver tube, and the oil level detection infrared transmitter tube are all housed inside the protective sleeve.

[0009] The sheaths located at the infrared receiving tube and the infrared emitting tube for oil level detection are provided with infrared holes for infrared radiation to be emitted or received.

[0010] The sheath is sealed by epoxy resin potting.

[0011] The refractive and reflective elements are arranged in the output light path of the oil level detection infrared emitting tube, and are used to reflect the infrared light emitted by the oil level detection infrared emitting tube twice before it is received by the oil level detection infrared receiving tube, or to reflect and refract the infrared light emitted by the oil level detection infrared emitting tube and then receive it by the oil level detection infrared receiving tube.

[0012] The infrared receiver and infrared emitter for oil detection are located on both sides of the front end face of the sheath and distributed on both sides of the refractive and reflective elements.

[0013] The transmission and reflection components are arranged in the output light path of the oil quality detection infrared emitting tube, including a concave transmission surface, a reflective surface and a convex transmission surface arranged in sequence. The infrared light emitted from the oil quality detection infrared emitting tube is transmitted through the concave transmission surface to the reflective surface, and then totally reflected by the reflective surface to the convex transmission surface. The infrared light transmitted through the convex transmission surface is then received by the oil quality detection infrared receiving tube.

[0014] The control module is connected to the totalizer of the flow meter being measured via a cable. It is used to control the on / off state of the infrared receiver tube for oil level detection, the infrared transmitter tube for oil level detection, the infrared receiver tube for oil quality detection, and the infrared transmitter tube for oil quality detection, and to transmit the optical information received by the infrared receiver tube for oil level detection and the infrared transmitter tube for oil quality detection, as well as the optical information emitted by the infrared transmitter tube for oil level detection and the infrared transmitter tube for oil quality detection, to the totalizer.

[0015] Furthermore, the sheath is made of stainless steel.

[0016] Furthermore, it also includes cable guide bolts;

[0017] The cable guide bolt is connected to the rear end of the sheath, and the cable passes through the cable guide bolt and is then connected to the integrator.

[0018] Furthermore, the transmission and reflection components, as well as the refraction and reflection components, are all made of plexiglass.

[0019] Furthermore, the axes of the transmission and reflection elements, the refraction and reflection elements, and the sheath coincide;

[0020] The oil level detection infrared receiver and the oil level detection infrared transmitter are symmetrically arranged along the axis, and the oil quality detection infrared receiver and the oil quality detection infrared transmitter are symmetrically arranged along the axis.

[0021] The present invention also proposes a gas Roots flow meter, which is characterized in that: the above-mentioned refueling detection device is installed on its oil chamber;

[0022] In the refueling detection device, the infrared emitting tube for oil quality detection comes into contact with the oil in the oil chamber.

[0023] Furthermore, the refueling detection device is installed on the oil chamber of the flow meter via a sight glass sleeve;

[0024] The inner wall of the endoscope sleeve is a through hole that is adapted to the outer wall of the refueling detection device sleeve;

[0025] One end of the sheath passes through the through hole, thereby allowing the oil quality detection infrared receiving tube and / or oil quality detection infrared emitting tube to come into contact with the oil in the oil cavity.

[0026] Furthermore, the endoscope sleeve is made of glass.

[0027] This invention also proposes a method for detecting refueling in a gas Roots flow meter: using the above-mentioned refueling detection device, specifically including the following steps:

[0028] Step 1: Install the refueling detection device onto the gas roots flow meter, and set the acquisition period T on the control module to acquire and record the initial oil level and initial oil quality information; set the oil level threshold X and oil quality threshold Y on the integrator of the gas roots flow meter.

[0029] Step 2: Start of the data collection cycle

[0030] Step 3: Perform oil quality and oil level testing.

[0031] Step 3.1: Oil level check

[0032] Step 3.1.1: The infrared emitting tube for oil level detection emits infrared light, which is received by the infrared receiving tube for oil level detection after passing through the refraction and reflection components; the control module transmits the emitted and received information to the integrator, and the integrator processes the infrared light emitted by the infrared emitting tube and the infrared light received by the infrared receiving tube for oil level detection to obtain A1 and A2 respectively.

[0033] Step 3.1.2: If A1-A2<X, it means the oil level is too low. Record the oil level alarm cycle, suspend the use of the gas roots flow meter, and then add oil. The oil level after adding oil is used as the initial oil level for the next round of testing. Return to step 3.1.1. If A1-A2≥X, it means the oil level is normal, no oiling is needed, and it can be used normally. Proceed to step 3.2.

[0034] The oil level alarm cycle is the number of cycles required to reach the current oil level from the initial oil level.

[0035] Step 3.2: Oil quality testing

[0036] Step 3.2.1: The infrared emitting tube for oil quality detection emits infrared light, which is received by the infrared receiving tube for oil quality detection after passing through the transmission and reflection components; the control module transmits the emitted and received information to the integrator, and the integrator processes the infrared light emitted by the infrared emitting tube for oil quality detection and the infrared light received by the infrared receiving tube for oil level detection to obtain B1 and B2.

[0037] Step 3.2.2: If B1-B2>Y, it means that the lubricating oil in the tested cavity is turbid and contains a lot of impurities. Record the oil quality alarm cycle, suspend the use of the gas Roots flow meter, clean the oil cavity, and use the oil quality after adding oil as the initial oil quality for the next round of testing. Return to step 3.2.1; otherwise, it means that the lubricating oil in the oil tank is normal, and proceed to step 4.

[0038] Among them, the oil quality alarm cycle is the number of cycles required to reach the current oil quality from the initial oil quality;

[0039] Step 4: The gas Roots flow meter is used normally until the end of the current cycle. When the next cycle begins, return to Step 2.

[0040] Furthermore, it also includes: Step 5: Bearing health status monitoring

[0041] Repeat steps 2-4 at least twice to obtain at least two sets of oil level alarm cycles in step 3.1.2 and oil quality alarm cycles in step 3.2.2. If the time difference between the first oil level alarm cycle and the last alarm cycle is less than Z and the time difference between the first oil quality alarm cycle and the last oil quality alarm cycle is less than G, it indicates that the bearing is worn. Stop using the flow meter and repair the bearing.

[0042] in:

[0043] Z represents the allowable normal error value for the time difference between two oil level alarm cycles when the bearing is in good condition;

[0044] G is the allowable normal error value for the time difference between two oil quality alarm cycles when the bearing is in good condition.

[0045] The beneficial effects of this invention are:

[0046] 1. The present invention provides a refueling detection device, which realizes the dual functions of oil level detection and oil quality detection through the setting of an infrared receiving tube for oil level detection, an infrared emitting tube for oil level detection, an infrared receiving tube for oil quality detection, an infrared emitting tube for oil quality detection, a transmission and reflection component, and a refraction and reflection component. This allows for monitoring of the quantity and quality of oil in the oil chamber and reminding staff to handle the situation in a timely manner.

[0047] 2. The present invention provides a gas roots flow meter, which ensures the detection accuracy of the gas roots flow meter and prevents jamming by installing a refueling detection device with dual functions of oil level detection and oil quality detection on the gas roots flow meter.

[0048] 3. The present invention provides a gas Roots flow meter that, by periodically testing the oil quality and oil liquid, can prevent the influence of pipeline dust and residue on the flow meter's measurement accuracy; and prevent the flow meter from jamming due to long-term lack of lubrication.

[0049] 4. The present invention provides a gas Roots flow meter that, by monitoring the oil level alarm cycle and the oil quality alarm cycle, can prevent damage to the flow meter bearings caused by the lack of lubricating oil, thereby improving the service life of the flow meter.

[0050] 5. The present invention relates to a gas roots flow meter, which connects a refueling detection device to an Internet of Things module on the gas roots flow meter integrator, thereby improving the level of refined management of the operation and maintenance of the gas roots flow meter.

[0051] 6. The present invention provides a method for detecting the refueling of a gas Roots flow meter, which can monitor and provide early warning of the oil level and quality in the oil tank, ensuring the safe operation of the gas Roots flow meter. Attached Figure Description

[0052] Figure 1 This is a cross-sectional structural schematic diagram of an embodiment of the refueling detection device of the present invention;

[0053] Figure 2 This is a schematic diagram of the structure of a gas Roots flow meter;

[0054] Figure 3 yes Figure 2 Sectional view at point AA;

[0055] Figure 4 This is a schematic diagram of the oil quality detection principle of the refueling detection device of the present invention (oil quality is good);

[0056] Figure 5 This is a schematic diagram of the oil quality detection principle of the refueling detection device of the present invention (the oil is turbid);

[0057] Figure 6 This is a schematic diagram of the oil level detection principle of the refueling detection device of the present invention (oil level is high);

[0058] Figure 7 This is a schematic diagram of the oil level detection principle of the refueling detection device of the present invention (oil level is low);

[0059] Figure 8 This is a schematic diagram of the control module.

[0060] In the diagram, 1. Infrared receiver for oil level detection; 2. Infrared transmitter for oil level detection; 3. Infrared receiver for oil quality detection; 4. Infrared transmitter for oil quality detection; 5. Transmitting and reflecting components; 6. Refraction and reflecting components; 7. Sheath; 8. Cable guide bolt; 9. Sight lens cover; 10. Control module. Detailed Implementation

[0061] To make the objectives, advantages, and features of the present invention clearer, the following detailed description of a refueling detection device, a gas Roots flow meter, and a refueling detection method proposed by the present invention, in conjunction with the accompanying drawings and specific embodiments, will provide further details. The advantages and features of the present invention will become clearer according to the following specific embodiments. It should be noted that the accompanying drawings are all in a very simplified form and use non-precise proportions, and are only used to conveniently and clearly assist in illustrating the objectives of the embodiments of the present invention; secondly, the structures shown in the drawings are often part of the actual structures.

[0062] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can also refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0063] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0064] A refueling detection device, such as Figure 1 As shown, it includes a control module 10, an oil level detection infrared receiver 1, an oil level detection infrared transmitter 2, an oil quality detection infrared receiver 3, an oil quality detection infrared transmitter 4, and a transmission and reflection component 5, a refraction and reflection component 6, a sheath 7, and a wire guide bolt 8 connected from left to right.

[0065] The axes of the transmission and reflection components 5, the refraction and reflection components 6, the sheath 7, and the wire guide bolt 8 are aligned;

[0066] The control module 10 is connected to the totalizer of the flow meter under test via a cable. It is used to control the oil level detection infrared receiver 1, the oil level detection infrared transmitter 2, the oil quality detection infrared receiver 3, and the oil quality detection infrared transmitter 4. It also transmits the optical information received by the oil level detection infrared receiver 1 and the oil quality detection infrared receiver 3, as well as the optical information emitted by the oil level detection infrared transmitter 2 and the oil quality detection infrared transmitter 4, to the totalizer. The totalizer processes and displays the received information.

[0067] The rear end of the oil quality detection infrared receiver tube 3, the rear end of the oil quality detection infrared transmitter tube 4, the control module 10, the oil level detection infrared receiver tube 1, and the oil level detection infrared transmitter tube 2 are all housed within the sheath 7. The sheath 7 located at the oil level detection infrared receiver tube 1 and the oil level detection infrared transmitter tube 2 has infrared holes for infrared radiation to be emitted or received, so that the infrared radiation emitted by the oil level detection infrared transmitter tube 2 can pass through the infrared holes and be emitted to the refraction and reflection element 6, and then be received by the oil level detection infrared receiver tube 1 from the refraction and reflection element 6 and the infrared holes.

[0068] Sheath 7 is sealed by epoxy resin potting;

[0069] The oil level detection infrared receiver 1 and the oil level detection infrared emitter 2 are symmetrically distributed on both sides of the axis of the refractive and reflective element 6, and are located within the projection plane of the refractive and reflective element 6 from left to right.

[0070] The refractive and reflective element 6 is disposed in the output light path of the oil level detection infrared emitting tube 2. It is used to reflect the infrared light emitted by the oil level detection infrared emitting tube 2 twice before it is received by the oil level detection infrared receiving tube 1, or to reflect and refract the infrared light emitted by the oil level detection infrared emitting tube 2 and then receive it by the oil level detection infrared receiving tube 1. Specifically, the refractive and reflective element 6 includes a first side and a second side. The first side is used to reflect and / or refract only the infrared light emitted by the oil level detection infrared emitting tube 2; the second side is used to reflect only the infrared light reflected by the first side a second time; the oil level detection infrared receiving tube 1 is used to receive the infrared light reflected by the second side.

[0071] The infrared receiver tube 3 and the infrared emitter tube 4 for oil quality detection are symmetrically distributed on both sides of the sheath 7;

[0072] The transmission and reflection components 5 are arranged in the output light path of the oil quality detection infrared emitting tube 4, including a concave transparent surface, a reflective surface and a convex transparent surface arranged in sequence. The infrared rays emitted by the oil quality detection infrared emitting tube 4 are transmitted through the concave transparent surface to the reflective surface, and then totally reflected by the reflective surface to the convex transparent surface. The infrared rays transmitted through the convex transparent surface are then received by the oil quality detection infrared receiving tube 3.

[0073] The infrared receiver tube 3 for oil quality detection is used to receive infrared rays transmitted through the convex surface.

[0074] The protective sleeve 7 is made of stainless steel, while the first and second reflectors are made of plexiglass.

[0075] Based on the oil quality detection principle of the above-mentioned refueling detection device: as follows: Figure 4 and Figure 5As shown, the oil quality is detected by the infrared light emitted by the oil quality detection infrared emitting tube 4. After passing through the lubricating oil, the light source enters the concave lens surface at the top of the sensor, and is then reflected off the top of the sensor by the reflective surface. The light source is then received by the oil quality detection infrared receiving tube 3. When the lubricating oil in the tested cavity is turbid and contains many impurities, the light signal received by the oil quality detection infrared receiving tube 3 is weak; when the lubricating oil in the tested cavity is clear, the light signal received by the oil quality detection infrared receiving tube 3 is strong.

[0076] Based on the oil level detection principle of the above-mentioned refueling detection device: as follows: Figure 6 and Figure 7 As shown, when there is sufficient lubricating oil in the cavity, the infrared light emitted by the oil level detection infrared emitting tube 2 is refracted at the contact surface between the sensor and the oil body, resulting in a weakened light source signal received by the oil level detection infrared receiving tube 1. When the lubricating oil in the cavity drops to the level that needs to be filled, the infrared light emitted by the oil level detection infrared emitting tube 2 is refracted at the point where the sensor and the oil body are no longer in contact, resulting in a stronger light source signal received by the oil level detection infrared receiving tube 1.

[0077] This invention also proposes a gas Roots flow meter, such as Figure 2 and Figure 3 As shown, a glass endoscope sleeve 9 is sealed to the oil chamber by a sealing ring. The refueling detection device is installed on the oil chamber of the flow meter through the endoscope sleeve 9. The inner wall of the endoscope sleeve 9 has a through hole that matches the outer wall of the refueling detection device sleeve 7. One end of the sleeve 7 passes through the through hole, so that the oil quality detection infrared receiving tube 3 and / or the oil quality detection infrared emitting tube 4 are in contact with the oil in the oil chamber. The refueling detection device is installed on the endoscope sleeve 9 by a snap fastener. During installation, it is ensured that the oil quality detection infrared emitting tube 4 is in contact with the oil, and when the oil level is appropriate, the central axis of the transmission and reflection element 5 and the refraction and reflection element 6 are flush with the oil level.

[0078] Based on the above-mentioned gas Roots flow meter, a method for detecting oil filling using a gas Roots flow meter is proposed, which specifically includes the following steps:

[0079] Step 1: Install the refueling detection device onto the gas roots flow meter, set the acquisition period T on the control module 10, and record the initial oil level and oil quality information; set the oil level threshold X and oil quality threshold Y on the integrator of the gas roots flow meter.

[0080] Step 2: Cycle begins

[0081] Step 3: Perform oil quality and oil level testing.

[0082] Step 3.1: Oil level check

[0083] Step 3.1.1: The infrared emitting tube 2 for oil level detection emits infrared light, which is received by the infrared receiving tube 1 after passing through the refraction and reflection element 6. The control module 10 transmits the emitted and received information to the integrator. The integrator processes the infrared light emitted by the infrared emitting tube 2 and the infrared light received by the infrared receiving tube 1, obtaining A1 and A2 respectively. The integrator displays and issues warnings based on the obtained data. The principle of the control module 10 is as follows: Figure 8 As shown;

[0084] Specifically: After the refueling detection device and the gas roots flow meter integrator interact with each other through data, the integrator will display the analyzed and compared data to the user on-site through the integrator's user alarm module (the user alarm module includes an LCD screen display or LED warning lights on the instrument panel), or send alarm notification information to the user through the wireless communication module.

[0085] Step 3.1.2: If A1-A2 < X, it indicates that the oil level is too low. Record the oil level alarm cycle, suspend the use of the gas Roots flow meter, and then refuel. During refueling, the oil level can be collected in real time by the integrator, and the user will be reminded on-site whether too much oil has been added through the LCD display of the integrator. After refueling, return to step 3.1.1. If A1-A2 ≥ X, it indicates that the oil level is normal, no refueling is needed, and the machine can be used normally. Proceed to step 3.2. The integrator displays the obtained data and issues a warning.

[0086] The oil level alarm cycle is the current oil level plus the time taken to reach the current oil level from the initial oil level.

[0087] Specifically: After the refueling detection device and the gas roots flow meter integrator interact with each other through data, the integrator will display the analyzed and compared data to the user on-site through the integrator's user alarm module (the user alarm module includes an LCD screen display or LED warning lights on the instrument panel), or send alarm notification information to the user through the wireless communication module.

[0088] Step 3.2: Oil quality testing

[0089] Step 3.2.1: The infrared emitting tube 4 for oil quality detection emits infrared rays, which are received by the infrared receiving tube 3 for oil quality detection after passing through the transmission and reflection element 5; the transmitted and received information is transmitted to the integrator through the control module; the integrator processes the infrared rays emitted by the infrared emitting tube 4 for oil quality detection and the infrared rays received by the infrared receiving tube 3 for oil quality detection to obtain B1 and B2.

[0090] Step 3.2.2: If B1-B2>Y, it indicates that the lubricating oil in the tested cavity is turbid and contains many impurities. Record the oil quality alarm cycle, suspend the use of the gas Roots flow meter, clean the oil cavity, and refill the oil. During the refilling process, the oil quality can be collected in real time by the integrator, and the user will be reminded on the LCD screen of the integrator whether the oil cavity is clean. After the refilling is completed, return to step 3.2.1; otherwise, it indicates that the lubricating oil in the tank is of normal quality, and proceed to step 4.

[0091] The oil quality alarm cycle is the current oil quality plus the time taken to reach the current oil quality from the initial oil quality.

[0092] Step 4: The gas Roots flow meter is used normally until the end of the current cycle. When the next cycle begins, return to step 2.

[0093] Step 5: Bearing Health Monitoring

[0094] Repeat steps 2-4 multiple times to obtain at least two sets of oil level alarm cycles in step 3.1.2 and oil quality alarm cycles in step 3.2.2. If the time difference between the first oil level alarm cycle and the last alarm cycle is less than Z and the time difference between the first oil quality alarm cycle and the last oil quality alarm cycle is less than G, it indicates that the bearing is worn. Stop using the flow meter and repair the bearing.

[0095] in:

[0096] Z represents the allowable normal error value for the time difference between two oil level alarm cycles when the bearing is in good condition;

[0097] G is the allowable normal error value for the time difference between two oil quality alarm cycles when the bearing is in good condition.

Claims

1. A refueling detection device, characterized in that: It includes a control module (10), an oil level detection infrared receiver (1), an oil level detection infrared transmitter (2), an oil quality detection infrared receiver (3) and an oil quality detection infrared transmitter (4) connected to the control module (10), and a transmission and reflection component (5), a refraction and reflection component (6), a wire guide bolt (8) and a sheath (7) connected from front to back. The rear end of the oil quality detection infrared receiver tube (3), the rear end of the oil quality detection infrared transmitter tube (4), the control module (10), the oil level detection infrared receiver tube (1) and the oil level detection infrared transmitter tube (2) are all set inside the sheath (7); the cable pass-through bolt (8) is connected to the rear end of the sheath (7), and the cable passes through the cable pass-through bolt (8) and is connected to the totalizer. The sheath (7) located at the oil level detection infrared receiver (1) and the oil level detection infrared transmitter (2) has an infrared hole for infrared radiation to be emitted or received; The sheath (7) is sealed by epoxy resin potting; The refractive and reflective element (6) is set in the output light path of the oil level detection infrared emitting tube (2) to reflect the infrared light emitted by the oil level detection infrared emitting tube (2) twice before it is received by the oil level detection infrared receiving tube (1), or to reflect and refract the infrared light emitted by the oil level detection infrared emitting tube (2) and then receive it by the oil level detection infrared receiving tube (1). The oil quality detection infrared receiving tube (3) and the oil quality detection infrared emitting tube (4) are located on both sides of the front end face of the sheath (7) and distributed on both sides of the refractive and reflective elements (6); The transmission and reflection element (5) is set in the output light path of the oil quality detection infrared emitting tube (4), including a concave transparent surface, a reflective surface and a convex transparent surface arranged in sequence. The infrared rays emitted by the oil quality detection infrared emitting tube (4) are transmitted through the concave transparent surface to the reflective surface, and then are totally reflected by the reflective surface to the convex transparent surface. The infrared rays transmitted through the convex transparent surface are then received by the oil quality detection infrared receiving tube (3). The control module (10) is connected to the totalizer of the flow meter being measured via a cable. It is used to control the on / off state of the oil level detection infrared receiver (1), the oil level detection infrared transmitter (2), the oil quality detection infrared receiver (3), and the oil quality detection infrared transmitter (4), and to transmit the optical information received by the oil level detection infrared receiver (1) and the oil quality detection infrared receiver (3) and the optical information emitted by the oil level detection infrared transmitter (2) and the oil quality detection infrared transmitter (4) to the totalizer. The axes of the transmission and reflection element (5), the refraction and reflection element (6), and the sheath (7) are coincident; The oil level detection infrared receiver (1) and the oil level detection infrared transmitter (2) are symmetrically arranged along the axis, and the oil quality detection infrared receiver (3) and the oil quality detection infrared transmitter (4) are symmetrically arranged along the axis.

2. The refueling detection device according to claim 1, characterized in that: The sheath (7) is made of stainless steel.

3. The refueling detection device according to claim 2, characterized in that: Both the transmission and reflection component (5) and the refraction and reflection component (6) are made of plexiglass.

4. A gas Roots flow meter, characterized in that: An oil filling detection device as described in Claim 1 is installed on its oil chamber; In the oil filling detection device, the oil quality detection infrared emission tube (4) contacts the oil liquid in the oil chamber, and the central axes of the transmission and reflection component (5) and the refraction and reflection component (6) are flush with the oil level for oil quality and oil level detection.

5. A gas Roots flow meter according to claim 4, characterized in that: The oil filling detection device is installed on the oil chamber of the flowmeter through the sight glass sleeve (9); The inner wall of the sight glass sleeve (9) is a through hole adapted to the outer wall of the sheath (7) of the oil filling detection device; One end of the sheath (7) passes through the through hole, so that the oil quality detection infrared receiving tube (3) and / or the oil quality detection infrared emission tube (4) contact the oil liquid in the oil chamber.

6. A gas roots flowmeter according to Claim 5, characterized in that: The sight glass sleeve (9) is made of glass.

7. A method for detecting refueling using a gas Roots flow meter, employing the refueling detection device described in claim 1, characterized in that, Specifically, it includes the following steps: Step 1: Install the oil filling detection device on the gas roots flowmeter, set the acquisition period T on the control module (10), acquire and record the initial oil level and initial oil quality information; set the oil level threshold X and the oil quality threshold Y on the integrating instrument of the gas roots flowmeter; Step 2: The acquisition period starts Step 3: Perform oil quality and oil level detection Step 3.1: Oil level detection Step 3.1.1: The oil level detection infrared emission tube (2) emits infrared rays, which are received by the oil level detection infrared receiving tube (1) after passing through the refraction and reflection component (6); the information of emission and reception is transmitted to the integrating instrument through the control module (10), and the integrating instrument processes the infrared rays emitted by the oil level detection infrared emission tube (2) and the infrared rays received by the oil level detection infrared receiving tube (1) to obtain A1 and A2 respectively; Step 3.1.2: If A1 - A2 < X, it means that the oil quantity is too little, record the oil level alarm period, pause the use of the gas roots flowmeter and then perform oil filling, and use the oil level after oil filling as the initial oil level for the next round of detection, and return to Step 3.1.1; if A1 - A2 ≥ X, it means that the oil quantity is normal and no oil filling is required, and it can be used normally, and then perform Step 3.2; Among them, the oil level alarm period is the number of periods from the initial oil level to the current oil level; Step 3.2: Oil quality detection Step 3.2.1: The oil quality detection infrared emission tube (4) emits infrared rays, which are received by the oil quality detection infrared receiving tube (3) after passing through the transmission and reflection component (5); the information of emission and reception is transmitted to the integrating instrument through the control module (10), and the integrating instrument processes the infrared rays emitted by the oil quality detection infrared emission tube (4) and the infrared rays received by the oil quality detection infrared receiving tube (3) to obtain B1 and B2; Step 3.2.2: If B1 - B2 > Y, it means that the lubricating oil quality in the measured cavity is turbid and contains more impurities, record the oil quality alarm period, pause the use of the gas roots flowmeter and then clean the oil chamber, and use the oil quality after re-adding the oil liquid as the initial oil quality for the next round of detection, and return to Step 3.2.1; otherwise, it means that the lubricating oil quality in the fuel tank is normal, and then perform Step 4; Among them, the oil quality alarm cycle is the number of cycles required to reach the current oil quality from the initial oil quality; Step 4: The gas Roots flow meter is used normally until the end of the current cycle. When the next cycle begins, return to Step 2.

8. The method for detecting lubrication in a gas Roots flow meter according to claim 7, characterized in that: Also includes: Step 5: Bearing health monitoring Repeat steps 2-4 at least twice to obtain at least two sets of oil level alarm cycles in step 3.1.2 and oil quality alarm cycles in step 3.2.

2. If the time difference between the first oil level alarm cycle and the last alarm cycle is less than Z and the time difference between the first oil quality alarm cycle and the last oil quality alarm cycle is less than G, it indicates that the bearing is worn. Stop using the flow meter and repair the bearing. in: Z represents the allowable normal error value for the time difference between two oil level alarm cycles when the bearing is in good condition; G is the allowable normal error value for the time difference between two oil quality alarm cycles when the bearing is in good condition.

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